WDT Project Map
The Core Feasibility Case
Five objections recur against any mark-to-market wealth tax. The WDT’s answers, drawing across papers:
“You can’t value illiquid assets accurately every year.” The mechanism does not require accurate valuations. A declared value establishes the recognised basis from which all future deltas are measured; tax liability flows from the change between declared values, not from whether any declaration was correct. The state enforces the consequences of whatever was declared, not whether it was correct. Understatement defers rather than eliminates tax; overstatement inflates a refund entitlement that will overshoot in a loss year. At canonical parameters, declaration ratios spanning α = 0.8 to α = 1.5 produce lifetime outcomes close to honest declaration — the tolerant zone — a wide forgiving centre with penalties concentrated only at the tails. The valuation objection is dissolved at the design level, not managed. (WP §3.7; VAL §1, §7.1; RATES §10)
“Taxpayers will understate.” Within the tolerant zone, understatement is largely self-defeating: the basis gap compounds with asset growth and recovers at realisation. The refund in a loss year is proportional to the declared basis, so a systematic understater forfeits downside protection precisely when they need it most. For fungible assets, Route C’s must-transfer rule creates a direct compounding equity dilution cost without requiring any audit. The state does not need to win a technical competition over what an asset is worth; it needs only to enforce the consequences of what the taxpayer said it was worth. The model-implied behavioural centre is near α ≈ 1.1 — driven by refund-protection asymmetry under valuation uncertainty, not a genuine economic return to overstatement; the nominal mild-overstatement advantage does not survive NPV adjustment. (VAL §5, §7.2; WP §8.1)
“The arithmetic doesn’t work.” RATES establishes four properties simultaneously at the 2000 reference scenario — chosen because it produces the lowest post-fill coverage of all 73 tested start years. The SRR fills within 3 years invariantly across all 73 historical start years: the refund guarantee becomes mechanically credible within a single political cycle. The LRR fills in every tested start year with a breakeven range of 7–29 years and a median of 13. Post-fill fiscal surplus reaches 6–15% of government expenditure at the 2000 worst-case and 125.5% at the median start year. Individual burdens are proportionate throughout: the revenue-weighted annual wealth burden is 0.35% of net worth, below the 1–2% stock levy of conventional wealth tax proposals; the gain-weighted effective lifetime rate is 13.0%, comparable to CGT on a materially larger base. (RATES §10)
“The rich will just leave.” Norway’s 2022 wealth tax increase produced migration responses that were real but fiscally modest — roughly 22 cents of revenue lost per unit raised, with overall revenues continuing to grow. The cross-base externality (Agrawal et al. 2025: income and VAT losses approximately six times the direct wealth-tax loss) is the dominant empirical qualification and Phase One’s first measurement priority. The WDT’s design responses are structural: Route C and D hold taxpayers’ entire accumulated basis gap as a departure cost; the lifetime contribution envelope persists across closures and re-entries; the bridging facility (CLOSE §5) decouples physical departure from settlement completion. The Governing Council can reduce rates in response to observed departure — a capacity no prior wealth tax mechanism held. (WP §7.3; BEHAV §9.2; CLOSE §4.2)
“Governments will eventually scrap the refund.” The refund commitment is designed for legal durability from the outset, not as a political aspiration. Ten enumerated structural clauses (GOV §5.2) protect the mechanism’s core commitments against erosion within the governance architecture itself. The SRR is ring-fenced and pre-funded; the refund drawdown is mechanical and constitutionally guaranteed, not subject to governance discretion. The SWF’s accumulated reserves mean the government cannot suspend the refund without breaching a funded obligation rather than merely breaking a promise. Constitutional entrenchment is the long-run goal, built on the track record Phase One creates. (WP §4, §8.5; GOV §4.2)
Section 1 — Core
WP: The White Paper
The spine of the project. Establishes the mechanism, derives each component from the others, frames the cooperative logic, and identifies what companion papers must establish.
Mechanism. The WDT levies a progressive annual charge on the change in an individual’s net worth above an exemption threshold. Three interdependent components — accrual-basis delta tax, symmetric loss-refund, Sovereign Wealth Fund — plus taxpayer governance participation in the SWF are designed as a system: each exists because the others require it. The delta base removes the lock-in distortion and debt-preference incentive that realisation-based systems create. (WP §3.1)
Valuation architecture. The state does not need to determine correct asset values, only enforce the consequences of declared values. A declared value becomes the legally operative basis; future deltas are calculated mechanically from it. Professional routes (A/B) place valuation risk with the valuator. Self-declaration routes (C/D) place it with the taxpayer. The tolerant zone (α ≈ 0.8–1.5) is a design feature: penalties concentrate at the tails, leaving the centre deliberately forgiving to absorb legitimate valuation uncertainty. (WP §3.7, §3.8)
Symmetric refund. The refund rate in loss years equals the marginal rate that would have applied to an equivalent gain. Full symmetry is a settled design position. The lifetime contribution envelope bounds total refunds at total taxes paid — preventing the mechanism functioning as public insurance — while creating a deepening cooperative stake that compounds across time. (WP §3.5)
Revenue. RATES demonstrates four properties simultaneously at the 2000 worst-case reference: refund credibility within 3 years; 100% success across 73 historical start years; post-fill surplus of 6–15% of government expenditure; revenue-weighted annual wealth burden of 0.35% and gain-weighted effective lifetime rate of 13.0%. The pre-behavioural combined estimate (individual WDT ~£874b, corporate levy ~£172b, UHNW tail ~£27b) approaches near-parity with UK total managed expenditure, inverting the conventional burden of proof. (WP §5)
Liquidity. The delta base significantly reduces the liquidity problem versus a stock wealth tax because tax is proportional to the gain rather than the total stock. Route C settles in equity; Route D defers all settlement to realisation. Conservative self-declaration within the reporting relationship is an intended feature, not a loophole — the mechanism is agnostic about declaration motive and does not need to know whether a declared value reflects a best estimate or a cash management decision. Route C and D liquidity management is resolved by design; Routes A and B remain the design challenge. (WP §8.2)
Implementation. Phase One: high threshold, small population, primary objectives are infrastructure and institutional legitimacy. Phase Two: lower threshold, labour tax relief dividend. Transition is condition-based, not calendar-based. Constitutional entrenchment starts with strong ordinary legislation and deepens as Phase One builds a track record. (WP §7, §8.5)
MF: Moral and Philosophical Foundations
Establishes the foundational axiom and terminal goal from which the design is derived, and records eight named compromises where theory and practice part company.
Foundational axiom. Individual human beings are the only legitimate moral subjects of a tax system. Everything in the design derives from this axiom applied consistently. Corporations, trusts, and funds are instruments; they have no welfare of their own. (MF §2)
Collective production argument. Two-level claim: the ontological level holds that large-scale financial wealth (shares, equity, contractual claims) is constituted by collective institutional frameworks, not merely supported by them; the causal level holds that the direction and magnitude of accumulation depends on the labour, consumption, and tax contributions of the broader population. The ontological claim is prior to and independent of the causal one. (MF §3.1, §3.2)
Wealth as power. Above sufficiency, wealth provides present-tense advantages that do not depend on spending: credit access, geographic optionality, political influence, legal leverage, intergenerational transmission. The consumption-tax tradition treats wealth as fiscally irrelevant until spent; the WDT rejects this at extreme concentration. Large net worth is durable institutional power operating in the present, characterised through Pettit’s non-domination framework. (MF §4, §6)
Terminal goal. Democratic flourishing understood as a mutual-interest condition — the wealthy depend on stable democratic institutions for the cheap security that makes accumulation possible; the majority must retain sufficient participation and material stake to remain willing partners. The labour tax relief dividend is the mechanism through which this goal is actually pursued; an implementation that taxed wealth but directed revenue elsewhere would fail on its own terms. (MF §6)
Cooperative architecture. Three convergent arguments reach the same institutional design by different routes: moral (the state must accept downside as well as upside), incentive-based (alters the rational calculus of the population best positioned to resist), and political-durability (harder to characterise as adversarial). The relationship is continuously reproduced, not fixed at founding — every assessment year in which the state shares downside risk is a renewal of the arrangement’s terms. (MF §7)
Named compromises. Eight points where foundational theory and practical design part company, to be consulted whenever a new design decision introduces a similar trade-off. Key items: the corporate instrument is a pragmatic departure from the individual-centred axiom; the exemption threshold is an administrative necessity; international mobility is managed, not closed; the Route D extreme residual is an accepted boundary condition. The Route D residual is accepted because a founder maintaining genuine privacy and exercising no formal influence beyond their own enterprise is at the outer edge of what the mechanism is designed to address — the concern is wealth as institutional power. (MF §9)
Section 2 — Prior Literature
LR.A: Research Gaps
Identifies nine confirmed gaps in existing academic literature bearing directly on WDT design. Three have since been closed by WFR. Six remain open.
Closed gaps (WFR). Gaps #1–3 are formally closed: (1) the Domar-Musgrave extension to a progressive delta base — WFR §3.2, §4.1 establishes all three complications (net-worth base, progressive marginal rates, multi-period rate asymmetry) are second-order at canonical parameters; (2) the welfare comparison including the delta base — WFR §3–§4 conducts the full comparison at revenue equivalence across six systems; (3) distributional arithmetic of delta-base concentration under persistent return heterogeneity — WFR §4.3 derives the 30-year Great/Poor concentration path showing accrual-vs-stock is the dominant axis. (LR.A §2.1–2.3)
Remaining formal modelling gaps. - §2.1 residual: the progressive rate’s three D-M complications are quantified but not formally derived as propositions — confirmed second-order, not proven negligible at all parameter combinations - §3.1: Cooperative compliance at the ultra-high-net-worth level — literature gap in the strict sense; requires studies designed around institutional networks of specialist advisers, not individuals. This is one of FAL’s H3 inputs. - §3.2: The cross-base migration externality — the Agrawal et al. 2025 finding exists but no modelling framework takes it as input and produces integrated cross-base revenue projections at WDT-specific parameters - §3.3: Administrative-layer intervention effects on compliance psychology — partly Phase One dependent but independently a gap in the compliance literature’s agenda - §4.1: Causal framework for wealth tax abolition — the three-mechanism framework in POL §3 is the paper’s own analytical construction, not yet independently validated - §4.2: International competitive dynamic at the political level — INST §6 provides the most developed treatment but identifies this as requiring comparative political economy modelling - §4.3: Minimum-tax floor interaction with refund-based systems — technical specification gap requiring treaty law and design work outside this project
What this paper is not. LR.A is diagnostic, not a survey. The intellectual ancestry covering all engaged literatures is in LR.B. (LR.A §1)
LR.B: Reference and Background
Reference guide across nineteen sections covering the intellectual ancestry the WDT engages: Haig-Simons and the comprehensive income tradition; prior accrual proposals and where they stopped (all reached the delta concept and stopped at valuation difficulty); Domar-Musgrave symmetric loss treatment; heterogeneous returns and welfare; the empirical wealth tax record; Harberger self-assessment; cooperative compliance; SWF reference cases; exit taxation and international coordination. The cross-base externality finding (Agrawal et al. 2025) is documented as the dominant qualification on the Norwegian 22-cent migration estimate. (LR.B §1–§19)
Section 3 — Jurisdiction
JUR: UK Jurisdiction and Data Reference
Justifies the UK as reference jurisdiction and compiles empirical data the companion papers require. Models an idealised country inheriting specific UK features, not the UK in its full constitutional complexity.
Key data. UK GDP ~£2.65 trillion; total managed expenditure 2022–23 ~£1,157b; equity return series 1947–2019 (JST dataset, capital gains only, 10.45% p.a. mean); WDT bracket populations via Pareto extrapolation above ~£3m, lighter than the true distribution and consistently conservative for revenue claims. WAS lost ONS Official Statistics accreditation in June 2025; all wealth distribution figures are treated as indicative, supplemented by HMRC administrative data and Advani et al. 2020 IFS estimates. (JUR §3–§5)
Institutional mapping. HMRC, VOA, OBR, and the tribunal system are mapped against WDT’s principal institutional requirements: where existing capacity is adequate, where expansion is needed, and where new functions must be built. The OBR’s February 2026 Resolution Foundation assessment is specifically relevant: it found the OBR under-resourced relative to comparable international institutions and identified the non-ring-fenced budget allocation as a structural vulnerability that the WDT’s SWF Custodian design should not inherit. (JUR §1.5)
HMRC data access. A formal HMRC data access agreement is a precondition for revenue microsimulation rather than a Phase One output; until it exists, revenue projections rely on publicly available statistics with acknowledged limitations. (JUR §4.3)
Section 4 — Mechanism & Valuation
VAL: Valuing Wealth
Establishes the four-route valuation architecture, the self-balancing mechanism, the tolerant zone, and the Route D auction as the deterrent of last resort.
Core reframe. The question is not how the state determines the correct value of an asset the taxpayer prefers to undervalue, but whether the state needs to determine that value at all. A declared value becomes the legally operative basis and tax liability flows mechanically from subsequent deltas. The state enforces the consequences of the declaration, not whether it was correct. (VAL §1)
Four-route architecture. Assets classified by fungible/non-fungible and professionally valued/self-declared produce four routes. Routes A/B: professional valuation with the valuator bearing risk of overturned assessment. Route C: self-declared fungible assets, settlement in kind only — the taxpayer transfers a proportional equity interest at the declared value, creating a direct compounding cost to understatement without requiring audit (the must-transfer self-balancing mechanism). Route D: self-declared non-fungible assets, no periodic formal assessment, settlement deferred to realisation only. Settlement must match the valuation route that produced the liability. (VAL §4)
Declaration strategy and the tolerant zone. Strategic stability rests on three layers. First, a broad tolerant zone: at canonical parameters, declaration ratios spanning α = 0.8 to α = 1.5 produce lifetime outcomes close to honest declaration, absorbing legitimate valuation uncertainty by design. Second, tail penalties: severe understatement at moderate-to-high growth and aggressive overstatement at moderate growth carry real accumulating costs. Third, asymmetry within the zone: understatement reduces refund protection in loss years while overstatement preserves it. The model-implied behavioural centre is near α ≈ 1.1 — a conditional prediction driven by refund-protection asymmetry under valuation uncertainty, not a dominant strategy or genuine economic return to overstatement; the nominal mild-overstatement advantage does not survive NPV adjustment (VAL.A §C.12). (VAL §7.1, §7.3)
Route D auction. Three pathways: corrective (Valuation Body triggered on confirmed egregious outlier in either direction), voluntary hard-reset (taxpayer-initiated for basis certainty), and inheritance (automatic on transfer). All share the same mechanics: the asset is offered at the taxpayer’s own declared value as the opening price, only third parties may bid, the taxpayer holds a right of first refusal at the highest third-party bid price, and the winning bid becomes the new recognised basis. The corrective trigger requires three-body Valuation Body unanimous agreement (sealed estimates, non-anchored, simultaneous opening); the taxpayer is not notified when a flag is raised, only when the auction notice publishes. Over-declaration produces a basis correction with no refund; under-declaration produces an upward delta taxed normally. (VAL §11)
Boundary conditions. Three named residual limits: the inception basis vulnerability (Route D basis weakest at first declaration); the reclassification boundary (assets moving from A/B to D carry a correct prior basis but lose ongoing self-correction); the auction market maturation boundary (competitive bidding may eventually reflect market dynamics rather than underlying value). Phase One declaration data versus subsequent realisation prices is the primary detection instrument. (VAL §14.4)
CORP: Corporate Architecture
Establishes the corporate delta levy as a collection mechanism that closes the attribution gap for large listed companies with dispersed ownership that individual WDT assessment cannot reach.
The instrument. The corporate delta levy is escrow, not a tax. A listed company measures its annual market-capitalisation change, pays a provisional amount into a settlement account, and issues statements to registered shareholders. Three ownership tranches: (1) Native WDT shareholders — provisional levy held until confirmed individual settlement, with credits released against individual WDT liability; (2) Identified intermediaries — provisional levy at entry rate at the company level, downstream pass-through available where the attribution test is met; (3) Unidentified beneficial owners — final charge at τ_h with no downstream recovery. The attribution test is binary: can the intermediary identify and attribute underlying beneficiaries to support individual WDT reconciliation? Attributability, not entity type, is the operative category. (CORP §5)
Loss years. No levy, no refund at the corporate level. Corporations do not experience losses in any humanly meaningful sense. Shareholders experiencing losses receive individual WDT refunds through personal assessment. (CORP §5.5)
Corporate lifecycle rules. IPO transition, mergers, share buybacks, thin trading, suspension/delisting, and dual-class structures each have settled design rules. Thin trading routes to Route B professional valuation below the liquidity threshold. Suspension and delisting are corporate position closure events handled by the CLOSE framework without a separate corporate rule. (CORP §4.1)
Rate parameters. τ_prov and τ_h are distinct optimisation problems (CORP.A §B.1, §B.2 respectively). τ_m is a ceiling for τ_h calibration, not its anchor. τ_0 is the dominant fiscal parameter at canonical k = 0.001. The corporate equity settlement facility allows companies to settle the provisional levy in equity rather than cash, with the SWF issuing a secured loan against the transferred shares — addressing the liquidity mismatch for cash-poor growth companies. (CORP §4; CORP §6; CORP.A §B)
GOV: Constitutional Governance
Establishes the three-chamber Governing Council, ten enumerated structural clauses, and the constitutional architecture protecting the mechanism against erosion.
The governance problem. Setting WDT parameters requires operational knowledge held almost entirely by the taxable population itself. Conventional democratic governance excludes that population from the formal process. The Governing Council resolves this by giving formal standing to those with the best operational knowledge while structurally preventing that advantage from becoming a decision advantage. DR — lottery-selected, holding no financial stake in any outcome — functions as the audience both TP and FS must convince, replacing expensive private lobbying with formal public argument in a setting where argument quality accumulates in the permanent record. (GOV §1.1)
Three-chamber structure. Taxpayer Chamber (TP, 25%), Fiscal Sovereign Chamber (FS, 25%), Dividend Recipient Chamber (DR, 50%). DR’s 50% share is derived — not chosen for symmetry — from the anti-collusion guarantee: DR’s unanimous opposition must independently be sufficient to defeat any joint TP/FS proposal, which requires DR’s share ≥ the combined share of the two proposing chambers. DR is filled by monthly birth-month lottery from the general population with staggered one-year terms and no re-election incentive. A proposal passes only if nays stay strictly below DR’s vote share and yays exceed 50% of votes actually cast, with non-votes excluded from the denominator. At the current 50/25/25 split, the two conditions are not independent: condition 1 is automatically satisfied whenever condition 2 holds. (GOV §3)
Four executive bodies. Three independent Valuation Bodies (identical mandates, hard institutional separation, staggered terms); the Allocator (recommendation function only, named as the most capture-vulnerable body); the SWF Custodian (singular mandate: protecting long-term fund stability, not derivable from the lever test, stated as a design choice); and the Administrator (transmission with all discretion removed — credential issuer and consistency-confirmer, not a truth-discovery authority). (GOV §6)
Ten enumerated structural clauses. Define the properties the system must preserve to remain the same kind of tax. Any compatibility question about a design change must be checked against these ten. Seven follow directly from foundational axioms; three rest partly on judgment — the Route D auction mechanism (at least three independent Valuation Bodies), DR’s lottery constitution, and mandatory permanent public transparency are the judgment-dependent three. The enumerated list is itself on the list. (GOV §5.2)
Refund guarantee. The refund drawdown is mechanical and constitutionally guaranteed, not subject to governance discretion. The pre-funded refund commitment is morally necessary rather than merely strategically useful: a state that could suspend the refund in a down year without breach would be participating in the relationship selectively. (GOV §4.2)
Section 5 — Revenue Modelling
RATES: Rates and Revenue
Establishes that the mechanism’s arithmetic works at proportionate individual burdens across the full range of historical starting conditions.
The question. Does the arithmetic work, without exception, on four properties simultaneously? The answer is yes at the 2000 reference scenario — chosen because it produces the lowest 10-year post-fill coverage of all 73 tested start years, making every claim a floor.
The four properties.
Refund credibility within a single political cycle. The SRR fills at year 3 invariantly across all 73 start years in the 1947–2019 UK equity return data, regardless of whether the mechanism inherits a boom or a crash.
The mechanism never fails. 100% success rate across all 73 start years and all four economic cycles. LRR breakeven ranges from 7 to 29 years, median 13. Reference scenario (2000) breakeven: year 19.
Fiscal replacement is viable at scale. Post-fill surplus equivalent to 6–15% of government expenditure at the 2000 worst-case; 125.5% TCM median across the 73-start-year sweep. Pre-behavioural combined estimate (individual WDT ~£874b, corporate levy ~£172b, UHNW tail ~£27b) approaches near-parity with UK total managed expenditure of ~£1,157b.
Individual burdens are proportionate throughout. Revenue-weighted annual wealth burden: 0.35% of net worth, below the 1–2% stock levy of conventional proposals. Gain-weighted effective lifetime rate: 13.0%, comparable to CGT on a materially larger base. Maximum annual wealth burden: 0.79%; maximum effective rate on gains: 27.2% — both requiring simultaneous membership of the top 0.01% wealth bracket and highest persistent-outperformance growth tier across the full 30-year horizon.
Conservatism direction. All modelling assumptions are chosen to understate revenue except one: behavioural responses are not modelled. Migration, restructuring, and avoidance will reduce actual revenue by an amount only Phase One can establish. Revenue is heavily concentrated at the upper tail — the population most capable of responding. The pre-behavioural combined estimate approaches near-parity with total managed expenditure; the open question is whether behavioural responses reduce it below the level where fiscal replacement remains viable. (RATES §10)
Rate function. A logistic S-curve: τ(W) = τ_m / (1 + A·exp(−k·(W − W_min))). Canonical parameters: τ_0 = 15%, τ_m = 70%, k = 0.001/£m, W_min = £2m. Full symmetry of the loss-refund is a settled design position: partial symmetry fails on two independent grounds — mechanically it breaks the D-M risk-sharing logic, and foundationally the symmetric refund is the operational expression of the state’s acceptance of downside exposure. Post-LRR-fill rate recalibration is architecturally required by enumerated clause 6 (continued accumulation beyond the floor target violates the labour relief commitment). (RATES §4, §6.3)
N = 30 as upper-bound horizon. N measures years in the WDT system, not the holding period of any asset. The 30-year working assumption is grounded in inheritance-triggered crossing of W_min using ONS demographic data; the WDT-relevant population lives longer than average, so N = 30 is the round number at the conservative upper end. Burden figures at N = 30 are ceiling estimates: both burden measures are increasing and convex in N, so taxpayers with shorter histories or loss years face lower burdens. (RATES §5)
SWEEPS: Parameter Sweeps and Governing Council Calibration
Characterises the parameter space available to the Governing Council through two complementary simulation datasets: SWEEPS.V (declaration incentives) and SWEEPS.R (fiscal outcomes).
Parameter hierarchy (fiscal — SWEEPS.R). τ_0 dominates: at canonical k = 0.001, the logistic midpoint sits far above top-bracket entry wealth, so τ_0 is approximately the whole rate every bracket pays. W_min is second on LRR fill timing. k matters conditionally above realistic values but with a corrected 100% success rate confirmed across all nine tested k values (the prior reduced success rates at k = 0.05/0.1 were an artefact of the since-corrected budget_growth derivation). τ_m is fiscally inert for the modelled population across the full sweep. (SWEEPS §3)
Parameter hierarchy (mechanism integrity — SWEEPS.V). τ_0 controls N-crossing timing — how quickly the self-limiting correction activates for aggressive overstaters. τ_m controls the understater penalty plateau ceiling — the egregious-understater deterrence lever, separable and concentrated at the far tail. k controls tolerant zone width and progressivity. W_min has near-zero leverage on declaration incentives for taxpayers above threshold. (SWEEPS §3)
N-crossing results. At canonical parameters all three tracked overstater levels (α = 1.5, 1.8, 2.0) cross into nominal net-cost territory before N = 22, with crossings at approximately N = 21, 20, 20 respectively. The mild-overstater (α = 1.5) nominal advantage does not survive NPV adjustment even before the crossing: periodic outflows are real early money while the sell-year refund is inflated late money. The self-correction is a stronger robustness result than pre-corrected sweep figures implied. (SWEEPS §2.2)
Synthetic stress-test. A sinusoidal growth scenario (g(t) = μ + A·sin(2πt/T)) establishes that the mechanism handles moderate cyclical volatility without accumulating deficit. Zero-coverage years in the 10-year post-fill window are 0 at amplitude A ≤ 5%, 2 at A = 6%, and 3 at canonical A = 8% — the same order of magnitude as the historical sweep’s worst-case start years. The LRR fill year is largely insensitive to cycle period T above 7 years; mean return μ is the dominant driver of transition speed. (SWEEPS §7.5)
The primary calibration tension. τ_0 is the one parameter where fiscal speed and declaration incentive correction move in the same direction, but both move together with entry burden. The policy question is not which dimension to sacrifice but how fast to proceed and at what entry burden Phase One is most likely to establish the cooperative norm. The τ_0 × W_min joint surface (item #17 in the open register) is the next analytical deliverable that does not require Phase One data. (SWEEPS §4)
Small lever set as design feature. Four rate-function parameters doing largely separable jobs is preferable to a larger entangled set on accountability and democratic legibility grounds: calibration decisions have characterised consequences that any motivated observer can track and evaluate against outcomes. (SWEEPS §6)
Section 6 — Robustness & Limits
BEHAV: Behavioural Robustness
Establishes behavioural robustness as a design property derivable from first principles, characterises nine behavioural shapes, and identifies the enforcement paradigm shift and the Membrane as its institutional expression.
First principles. Behavioural robustness is a design property, not a behavioural prediction. The existing architecture actively engineers stagnation through lock-in distortions, basis step-up, and debt preferences; the WDT removes those frictions before claiming any compliance improvement. (BEHAV §3)
The Membrane. Five friction types (information, visibility, legitimacy, feedback, compliance) produce five design principles. The Membrane — the layer through which taxpayers experience the institution — has five health dimensions with a documented interaction structure: Clarity and Accessibility share the strongest complementarity; Reciprocity and Responsiveness are complementary; Fairness is downstream of all four other dimensions and the leading indicator of membrane failure; Responsiveness and Accessibility compete directly for administrative resource. SWEEPS’s parameter separability result contributes structurally to both the Clarity and Fairness dimensions. (BEHAV §4–§6)
Nine behavioural shapes. From full cooperative compliance (Shape 1) to active resistance (Shape 9), these provide the complete map against which robustness is evaluated. Shapes 4–6 (restructuring, timing manipulation, cross-border asset migration without personal exit) generate most value at risk from avoidance. Shape 7 (personal exit) is one shape among nine — designing around the assumption it is the modal response is a category error. (BEHAV §7)
Enforcement paradigm shift. Unattributed ownership faces τ_h by default; surfacing hidden assets compounds the concealment cost progressively; the Route D entry basis is substantially more bounded than a pure detection-contest framing suggests. The route distribution analysis (BEHAV.A §A) establishes the empirical basis: Routes A and B likely account for ~60–85% of WDT-taxable wealth by volume, with Route D at ~10–20%, concentrated at the very top. VAL’s tolerant zone (α ≈ 0.8–1.5) further bounds the residual: Route D’s enforcement problem is the egregious-understatement tail, not imprecision in general. (BEHAV §8.1, §8.11, §8.12)
Cross-base externality. The Agrawal et al. 2025 six-to-one multiplier is a directional warning calibrated to conventional stock wealth taxes — structurally different from the WDT’s delta base at a revenue-weighted annual burden of 0.35% of net worth. The WDT is not a stock wealth tax and the ratio was calibrated to structurally different systems. The directional risk is retained; the magnitude is uncertain and a Phase One observable. The multiplier transforms the economics of membrane investment: each departure prevented saves approximately six times the direct WDT revenue that departure would have cost. Six structural responses are available including rate calibration, timeline extension, re-entry rule, and the formal possibility of net inward migration of wealthy individuals attracted by the cooperative architecture. (BEHAV §9.2; BEHAV.A §D)
Membrane calcification. The tendency of a mature institution to preserve processes suited to an earlier taxpayer population is the one form of institutional drift the WDT addresses least directly. The response is a named monitoring architecture: mandatory publication of five membrane health observables (self-assessment completion rate, unprompted refund claim rate, dispute rate by wealth band, refund processing time, professional adviser engagement rate for routine cases); the Taxpayer Chamber as institutional monitor; the Allocator as the Fairness-dimension signal; the TP/DR coalition as the lever against FS resistance on funding. (BEHAV §10; BEHAV.A §B)
Phase sequencing. Membrane investment is front-loaded and cannot be deferred. The personal adviser corps — state-funded advisers drawn from the displaced professional compliance industry — operationalises the Accessibility principle at the individual level for each Phase One taxpayer’s first assessment cycle. (BEHAV §11.1, §5.5–§5.6)
BEHAV.A: Behavioural Robustness — Supporting Analysis
Companion appendix to BEHAV relocating the supporting material from the main paper to preserve readability. Contains: full route distribution asset-class analysis (Routes A–D with % WDT-taxable wealth estimates); membrane calcification monitoring architecture including the five observables, the TP chamber monitoring function, the TP/DR coalition mechanism, and the Allocator as Fairness signal; the seven-part cross-base externality response including the jurisdictional transfer caveat, rate calibration lever, timeline extension buffer, re-entry rule temporal structure, and the immigration possibility; secondary objections; and three membrane institutional examples (retail banking as healthy membrane, water utilities as monopoly-induced degradation, mandatory insurance markets as interest-aligned degradation). (BEHAV.A §A–§D)
FAL: Falsifiable Hypotheses
The series’ self-critical paper. Identifies the five propositions WDT most depends on, states them in falsifiable form, specifies what evidence or modelling would count against each, and defines minimum requirements for hostile modelling to constitute a genuine test. Does not argue for WDT.
Five hypotheses.
H1 — Wealthy taxpayer preference: total economic cost of WDT ≤ total economic cost of the existing system for the relevant population. The comparison requires a heterogeneous taxpayer choice model across four wealth brackets (P90–95 through P99.9–99.99) including all-in friction costs: compliance, avoidance, lock-in, and uncertainty. No such model yet exists.
H2 — Macroeconomic effects (five sub-hypotheses): (a) removing lock-in improves capital allocation net of WDT valuation friction; (b) bilateral NICs displacement produces net welfare gain, LRR timeline permitting; (c) symmetric refund provides effective automatic stabilisation in financial crises; (d) capital allocation gain + labour displacement + consumer demand combine in a self-reinforcing positive loop subject to the 2% central bank inflation constraint; (e) automation base robustness (separately stated as H5).
H3 — Cooperative institutional equilibrium: wealthy taxpayers have sufficient long-run incentives to preserve rather than capture the institution. The bootstrapping phase is the acute vulnerability — Path A (SRR capitalises rapidly, refund demonstrated, envelope deepens) vs Path B (extended vulnerability, exit or avoidance, institutional failure). Voluntary prefunding by early participants who correctly understand the bootstrapping risk is an available mechanism that the required game-theoretic model must include.
H4 — Accumulation-point efficiency: taxing wealth change produces less aggregate distortion than taxing intermediate events at revenue equivalence. Partial theoretical support from WFR’s Category 1 lock-in result (141–143 bp). Full comparison including valuation friction, liquidity costs, migration, and avoidance costs has not been conducted.
H5 — Automation base robustness: WDT base more resilient to automation-driven labour income decline than labour-based fiscal systems. Structural claim based on the delta base tracking capital appreciation regardless of production method. Common vulnerability with H2d through the consumer demand channel.
Epistemic taxonomy. Category 1 (welfare costs of existing systems, established without requiring WDT implementation data); Category 2 (structural properties of the WDT following from the delta base and symmetric refund, independent of implementation outcomes); Category 3 (prospective implementation costs — real but not currently quantifiable). The standard objection “you haven’t shown it has no costs” conflates Category 2 and Category 3. (FAL §2, §6)
Status. H2a and H4 have partial theoretical support (WFR Category 1 lock-in results). H2c has empirical support by analogy (Norway 2020 GPFG drawdown). H1, H2b, H2d, H3, and H5 are hypotheses in search of a test.
SCOPE: Scope Boundary
Records which open question register items fall outside the project’s scope and why — distinguishing formal modelling gaps requiring peer-review infrastructure, comparative political economy requiring case-study depth, and jurisdiction-specific legal analysis. Prevents re-opening settled questions without addressing the objections already recorded. Three confirmed literature gaps remain open requiring formal modelling (#7–9). Ten Phase One empirical questions cannot be resolved without live system data. Two MACRO items require Phase One data before modelling can be calibrated. Six jurisdiction-specific items require legal analysis, diplomatic process, or institutional negotiation. See the Open Questions Register below for the full register.
Section 7 — Welfare & Distribution
WFR: Taxpayer Welfare Comparison Across Tax Systems
A Level 1 theoretical paper comparing six tax systems on welfare grounds at genuine revenue equivalence, closing literature gaps #1–3 simultaneously. WFR.A contains the full simulation tables underlying all results.
Scope and design. WFR compares flat symmetric WDT, progressive symmetric WDT, income tax, CGT, stock wealth tax, and consumption tax at E[T] = 2% of W₀ across both a 73-observation UK historical equity return series (Ver. A) and an idealised two-state distribution (Ver. B). The welfare criterion is certainty-equivalent welfare (CEW) against a no-tax benchmark. Distortions are admitted one at a time in a controlled sequence so welfare differences can be attributed to specific mechanisms. The canonical horizon is N = 30, consistent with RATES and SWEEPS. (WFR §2)
Three-category framework. Category 1 findings are welfare costs of existing systems established by the model — they do not require WDT to exist. Category 2 findings are properties of the WDT following from the delta base and symmetric refund, independently of implementation. Category 3 findings are prospective implementation costs that are real but not currently quantifiable. The burden of proof lies with demonstrating Category 3 costs plausibly exceed the Category 1 costs the paper has measured. (WFR §2.3)
Controlled baseline. With distortions suppressed, flat WDT leads income tax and CGT by 17.4 basis points and leads stock wealth and consumption tax by 133.1 basis points. The flat WDT satisfies Domar-Musgrave to floating-point precision across all tested γ — mechanism confirmed, welfare verdict deferred. Progressive WDT sits between the two clusters. Stock wealth and consumption tax are welfare-equivalent across all γ and both distributions — γ-invariance is a structural property of their non-return-conditioned bases. (WFR §3)
Progressive rate complications (Category 2 qualified). C1 (progression itself) produces a flat-vs-progressive welfare gap below 0.05 basis points at canonical parameters. C2 (leverage and net-worth base) produces up to +1.10 bp at 70% leverage. C3 (intertemporal rate asymmetry) shows the progressive WDT collecting less than flat in the canonical population because it sits on the near-flat entry limb of the logistic. All three complications are second-order at canonical parameters — confirmed, not negligible across all ranges. (WFR §4.1)
CGT lock-in (Category 1 dominant result). Once portfolio choice is endogenous, CGT imposes a switching wedge: the lock-in welfare cost is 141–143 basis points at the reference calibration (G/V = 50%, T = 5, τ_cgt = 24%), rising to 162 bp at G/V = 76.6% and plateauing at 181 bp from T = 8 years onward (the plateau reflects realisation-induced portfolio persistence compounding across multiple periods, not an ongoing annual lock-in). The WDT eliminates lock-in by construction (Category 2). The Arachi et al. 2022 objection that accrual taxation creates intertemporal consumption distortions is addressed directly: the symmetric refund restores consumption capacity at exactly the moment the Arachi mechanism would be most acute; the objection applies at the envelope binding boundary (Poor-tier entrants in the first loss year) but not in the general case. (WFR §4.2)
Heterogeneous returns and concentration. At N = 30 both WDT variants reach approximately 286–288× Great/Poor concentration; income tax reaches 320×; both stock-base systems reach 479×. The dominant axis is accrual basis versus stock base, not flat versus progressive rate — the progressive advantage on concentration requires horizons beyond N = 30 at canonical logistic parameters to become visible. The 479× result for stock-base systems is a Category 1 finding. The progressive WDT delivers better welfare than flat WDT at every tier, with the Poor-tier advantage of 8.2 bp (flat) / 46.3 bp (progressive) over income tax driven by the symmetric refund in loss years. The lifetime contribution envelope binds only for the Poor tier at the scenario’s opening year; for all other tiers the envelope does not bind across 30 years — this is the boundary condition under which the Arachi objection applies in full. (WFR §4.3)
Literature positioning. WFR closes gaps #1–3 from LR.A simultaneously. It enters without adjudicating the active Guvenen et al. (2023) vs Gerritsen-Jacobs-Spiritus (2025) dispute by adding the delta instrument to a comparison that has not previously included it. The general equilibrium model needed to adjudicate that dispute is a named open question assigned to MACRO. (WFR §5)
LDW: Labour Dividend Welfare
Asks what a mature WDT delivers to the roughly 99% of the adult population who will never cross the WDT exemption threshold. Exploratory and clearly labelled where speculative.
Core result. A median earner today takes home £31,628 in effective purchasing power. Under a mature WDT — through combined income tax and NICs displacement, consumption tax reduction, and SWF-funded energy cost reductions — effective purchasing power rises to approximately £43,144: a 36% increase in what the income actually buys. A lower earner on £25,000 gains proportionally more once consumption effects are included, because VAT and energy represent a larger share of lower incomes. The VAT and energy figures are illustrative scenario estimates, clearly labelled; the income tax and NICs displacement figures are arithmetic applied to verified 2025/26 rate schedules. (LDW §2, §4)
The payslip case (verified arithmetic). Bilateral NICs removal returns £176/month to a median earner (£39,039) and saves their employer £5,106/year. Full income tax displacement returns £441/month. Total payslip gain: £618/month. The bilateral removal case dissolves the standard incidence dispute: employer and employee savings are independent line items, so neither party can capture the other’s saving through wage bargaining. (LDW §2.1, §2.2)
Cost of living. VAT displacement reduces the cost of spending. SWF investment in energy infrastructure (the author’s normative case for a Governing Council decision not yet made) could reduce household energy bills by ~30% from the October 2025 Ofgem baseline, worth ~£527/year per household. Transport and communications infrastructure investment is directional only, not included in the purchasing power calculation. The purchasing power gains are approximately proportional across the earnings distribution and modestly progressive at the lower end. (LDW §4)
Employment structure. Bilateral NICs removal makes formal employment cheaper relative to gig and contractor arrangements — the opposite of the standard misreading. Occupational choice relaxes as the income threshold required for a decent standard of living falls. Geographic constraints on where people can afford to live relative to their employer ease. (LDW §3)
Welfare demand. Higher household financial margin moves the cascade threshold (the point at which ordinary life events become welfare-triggering crises) upward for a large fraction of the working population. Healthcare demand from financial stress falls. Pension dependency falls as households can save during working years. The feedback mechanism is directional; the elasticity is unknown before Phase One. (LDW §6)
What the paper cannot establish. The purchasing power figures assume full displacement actualises. Whether full displacement occurs depends on Governing Council calibration decisions, Phase One behavioural response data, and the LRR timeline. The infrastructure investment case in §4.3 is the author’s normative argument, not settled design. The welfare demand effects in §6 are directional without magnitudes. (LDW §7)
ENV: Environmental Effects and Transmission Channels
Establishes that the standard efficiency critique fails for the WDT and identifies four positive transmission channels. Characterises the declaration equilibrium’s macroeconomic consequences and assigns the full general equilibrium model to MACRO.
The standard critique fails. The standard framing — wealth taxation as a friction on a capital stock — fails for a tax on the annual change in net worth with a symmetric loss refund. The WDT removes capital allocation frictions (lock-in distortion, debt preference, basis step-up) rather than adding new ones. The aggregate friction removal across capital, labour, and corporate taxation is the primary efficiency argument, prior to any Domar-Musgrave or use-it-or-lose-it claims. (ENV §3)
Declaration equilibrium. Because a declared value establishes the basis, understatement defers rather than eliminates tax and imposes a growing basis gap; overstatement inflates a refund entitlement that will overshoot in a loss year. The locally stable zone is mild overstatement near α ≈ 1.1, driven by refund-protection asymmetry under valuation uncertainty. The nominal mild-overstatement advantage does not survive NPV adjustment (VAL.A §C.12). The population-level implication: declared tax base modestly exceeds true values; the cooperative architecture gains financial concreteness; the Route D auction deterrent fires less frequently against compliant declarers. The SRR calibration implication: if the overstatement equilibrium is confirmed by Phase One data, the SRR floor should be set modestly above the RATES baseline. (ENV §2)
Displacement channel. Staged replacement of labour taxation through constitutionally committed LRR accumulation delivers demand stimulus at a pace that reduces transition-shock risk (metered rather than abrupt). Bilateral NICs removal is the cleanest case: both sides see the benefit directly, no incidence ambiguity. (ENV §3–§4)
Automation. The WDT tax base tracks wealth delta regardless of whether appreciation was generated by human labour or capital deployment. As automation increases the productive value of capital, WDT revenue increases automatically without legislative change — categorically different from robot taxes, capital income taxes, or stock wealth taxes. See H5 in FAL for the falsifiable version. (ENV §4.3–§4.5)
Financial stability. The symmetric refund reaches the population whose portfolio decisions move asset markets precisely when liquidation pressure is highest, dampening the forced-selling mechanism. The SWF’s countercyclical deployment capacity and the DR chamber’s pre-commitment capacity are two independent countercyclical instruments requiring no discretionary intervention to activate. A GOV.B clarification is proposed: the Custodian’s investment mandate should include explicit guidance on accelerated Route C equity rotation pace under defined inflationary trigger conditions. (ENV §5, §7)
Open questions. The consumption multiplier magnitude and net bias direction of RATES estimates cannot be established without a general equilibrium model; this is assigned to MACRO as a Phase One successor. The automation tax-base migration quantification under different automation trajectories is similarly assigned. (ENV §9)
Section 8 — Implementation
CLOSE: Position Closure
Establishes death, jurisdictional exit, threshold fall-through, and bankruptcy as a unified class of event, and derives the bridging facility and re-entry rule from that unification.
Unified closure theory. All four closure types are the same kind of event: the WDT assessment position closes. The mechanism owes a correct final delta calculation and honours the symmetric refund on any negative final delta; the individual owes a correct final accounting regardless of why the position closes. Position suspension does not exist — threshold fall-through is a clean closure, and re-entry above threshold is a new first entry. The lifetime contribution envelope is a property of the individual, not the assessment position; it persists across all closures and re-entries. (CLOSE §2–§3)
Bridging facility. Decouples physical departure from settlement completion. Where the expected exit delta is positive the taxpayer posts a bond; where negative the SWF posts a bond to the taxpayer as security for the expected refund; where uncertain both sides post proportional bonds that net on settlement. Friction concentrates on non-cooperation, not on the act of departure. This is the structural expression of the no-punitive-exit-taxation position. The symmetric structure is the state accepting downside exposure at exit on the same terms as during the assessment period. (CLOSE §5)
Re-entry rule. The re-entry basis is the individual’s net worth at the point of re-entry (a fresh start on the basis). The lifetime envelope carries the prior history forward. This closes the strategic cycling loophole: a re-entrant who has received large prior refunds enters with reduced future refund headroom, proportional to what they already received. The carry-forward also operates in the other direction: a long-term participant carries a larger envelope balance and therefore more refund headroom into the new position. (CLOSE §6)
Beyond-lifetime-cap exploitation surface. If refunds could exceed cumulative lifetime contributions, a taxpayer could accumulate a modest tax history, engineer a large paper loss, receive a net refund, and exit. The lifetime cap makes this impossible by construction: the mechanism can only return what it has collected. The cap is not a restriction on the symmetric refund commitment — it is a removal of the incentive to manufacture losses. (CLOSE §8.4)
PHASE1: Phase One
Draws the line between what the design establishes and what only implementation can answer, and identifies seven empirical clusters unanswerable at the design stage.
Seven empirical clusters.
Cooperative architecture effects at professional-intermediary-mediated wealth levels. Primary measurement: distribution of declared α across taxpayer population, unprompted refund claim rates, dispute rates by asset class and route. Also requires a practitioner survey of advisory firms. Minimum observation: 5 assessment cycles. (PHASE1 §4.1, §5.1)
Avoidance shapes. Shapes 4, 5, 6 from BEHAV’s nine-shape taxonomy, measured from administrative data on restructuring notifications, route elections, and departure notifications. Shape 6 (cross-border asset migration without personal exit) requires AEOI data to decompose from Shape 7. (PHASE1 §4.2, §5.2)
Migration and cross-base externality. The Agrawal six-to-one multiplier is the prior; Phase One measurement requires matching departure notifications against HMRC income tax and VAT records and separating Shape 6 from Shape 7 through AEOI data. Largest fiscal implications of any cluster. (PHASE1 §4.3, §5.3)
Valuation route and assessment window adoption. Load-bearing for flexibility levy calibration and for the assessment of Route D’s share of WDT-taxable wealth. Primary observable: three annual Administrator publications on route distribution, window distribution, and preview calculations of the flexibility levy. (PHASE1 §4.4, §5.4)
Administrative-layer intervention effects. Six interventions, each with different measurement logic by friction type. The taxpayer history record is the highest-priority sub-item: minimum 4 assessment cycles before meaningful variance; requires Administrator access log linkage to assessment accuracy. (PHASE1 §4.5, §5.5)
OBR independence as mandate-guardian. Tracked from the published record through four structural properties: long-tenure appointment, transparent methodology, published forecasts, institutional separation. An independent advisory panel should produce a published assessment at Phase One’s end. (PHASE1 §4.6, §5.6)
Corporate instrument transition. Three data series: tranche-three share of total corporate ownership over time, attribution test pass/fail rates by entity type, non-reconciliation rates by wealth band. The CIT displacement question only becomes a policy decision when three threshold conditions (set by Governing Council before end of cycle 2) are jointly met. (PHASE1 §4.7, §5.7)
Evaluation design principle. Phase One that confirms working assumptions and Phase One that requires design revision are equally valid outcomes. What would not be valid is discovering after implementation that no measurement framework was in place to distinguish the two. The evaluation designs in PHASE1 §5 are specifications of what would close each cluster — useful independently of whether Phase One happens on any particular timeline. (PHASE1 §1)
Section 9 — Political & Strategic
POL: Political Architecture
Identifies the three structural failure mechanisms behind OECD wealth tax abolition and establishes political durability as a design property of the WDT.
Why wealth taxes fail. Twelve OECD countries levied individual net wealth taxes by 1990; most abolished them by 2020. Revenue was often still flowing at the point of abolition. Three structural failure mechanisms: (1) legitimacy collapse — a tax perceived as purely extractive, offering no visible reciprocal benefit, loses political legitimacy even when popular in surveys (France’s ISF commanded 60–80% public support throughout its final decade, yet was abolished); (2) organised opposition advantage — the Olson collective action asymmetry: a small concentrated taxed population systematically outperforms a large diffuse beneficiary population in political contests over institutional survival; (3) institutional brittleness — individually defensible exemptions accumulate invisibly into structural hollowing until formal abolition becomes costless. (POL §3)
Durability as design property. The WDT addresses all three failure mechanisms as a consequence of correct derivation rather than political afterthought. Each WDT institution serves multiple independent functions simultaneously: the symmetric refund addresses D-M risk-sharing, cooperative moral commitment, and taxpayer incentives before it addresses political reciprocity. Because each feature exists for three independent reasons, an opponent must pay three separate costs to remove it — the redundancy is what makes the failure rate lower. (POL §5)
The tiered citizenship problem. If the WDT succeeds at scale it will produce visible institutional distinctions between people based on their relationship to the mechanism (TP members, DR lottery participants, dividend recipients, the broader public). These tiers emerge from the mechanism’s own transactions, not deliberate design. The WDT does not introduce tiers to a non-tiered society; it makes existing invisible, unobligated tiers visible, obligated, and subject to democratic constraint. Whether visible obligated tiers are preferable to invisible unobligated ones is the democratic question the WDT makes askable. (POL §7; POL Appendix A)
Bootstrapping problem. Phase One is the vulnerability window — the mechanism is untested, the membrane unproven, and mutual stake not yet accumulated. The mitigations (SRR partially capitalised, refund demonstrated, envelope deepening) must replace the accidental hostage equilibrium before a hostile government arrives. A sufficiently high Phase One threshold compresses the window; voluntary prefunding by early participants who understand the institutional risk is an available mechanism. There is no mechanism-shaped resolution to the bootstrapping problem itself; it is addressed by sequencing. (POL §6)
FM: First Mover
Any jurisdiction that has concluded the WDT’s properties are likely true faces commit-or-suppress, with no stable middle option.
The binary. Waiting carries a compounding cost: every year is a year of first-mover advantages accruing elsewhere. The only rational responses are to commit before those advantages begin accruing elsewhere, or to ensure they never begin accruing anywhere. (FM §1)
Why partial adoption is unavailable. Removing the symmetric refund collapses the valuation architecture (understatement becomes straightforwardly attractive) and breaks the Domar-Musgrave risk-sharing logic. Removing the constitutional governance exposes the mechanism to the same incremental erosion that ended every prior OECD wealth tax. A partial WDT is not a weaker version of the same mechanism; it is a different mechanism that fails in predictable ways. The most damaging outcome is partial imitation that breaks the mechanism and takes the WDT’s name down with it. (FM §2)
What the first mover acquires. Within 3 years: the SRR fills and the refund guarantee becomes mechanically credible. Throughout the transition: lock-in distortions removed and capital more freely mobile. At the median of 13 years: the LRR reaches its floor and labour tax displacement begins at scale. Throughout: internationally mobile wealth moves toward a jurisdiction that offers loss protection available nowhere else. The compounding head start across valuation infrastructure, adviser ecosystem knowledge, SWF reserves, and behavioural evidence base cannot be recovered by later movers at equivalent cost. (FM §3)
The suppression strategy. Operates through raising apparent risk of commitment, generating substitutes, and positioning partial imitation as reform. Its structural weakness: the constituency most likely to execute suppression (professional advisers, officials, think tanks) lacks electoral weight; the constituency with the greatest material interest in the WDT demonstrating its properties (the working majority who would receive the labour dividend) is numerically decisive. (FM §3.2)
MOD: Modular Adoption
Distinguishes two categories of WDT institution and explains why Category 1 infrastructure accrues through locally rational policy decisions.
Category 1 (enabling infrastructure with independent justification). A national valuation profession with published standards; a public register of significant asset holdings; beneficial ownership attribution law; a sovereign wealth fund in the generic sense; independent fiscal governance in the generic sense. Each has a plausible case for adoption without mentioning the WDT. Three policy currents produce Category 1 independently: global beneficial ownership transparency initiatives, the pursuit of fiscal credibility and intergenerational saving, and professional reform in the valuation market. (MOD §2)
Category 2 (constitutively WDT-specific). The symmetric refund at the marginal tax rate; the declaration equilibrium that depends on the refund running from the declared basis; the Route D auction with its specific trigger and right-of-first-refusal architecture; the lifetime contribution envelope; the three-chamber Governing Council structure. These have no independent justification and require deliberate political commitment. (MOD §1)
The ceiling. Accretion reaches the Category 1 boundary and stops. A jurisdiction that has assembled mature Category 1 infrastructure has not adopted the WDT; it has lowered the remaining commitment cost when it eventually evaluates the WDT. The decision still requires deliberate political commitment to Category 2. (MOD §3)
INST: Fiscal Architecture and Institutional Selection
Examines whether the WDT creates a structural competitive dynamic between governance system types — specifically, whether democratic systems implementing a full WDT would gain access to a pool of private wealth that authoritarian systems are structurally excluded from.
The mechanism. The WDT creates two non-overlapping constituencies whose demands converge on identical governance requirements. Wealthy taxpayers require credible protection of the symmetric refund and valuation architecture — commitments requiring constitutional constraint on executive discretion. The working majority, once the labour dividend is flowing, acquires a direct financial interest in the mechanism’s continuation — creating demand for transparency and independent oversight. The convergence generates a cross-class accountability coalition. Any executive attempt to separate the constituencies requires simultaneously offering wealthy taxpayers weaker refund protection (which collapses cooperative declaration and the revenue base the dividend depends on) or reducing the majority’s benefit (which removes the fiscal source of the dividend). Neither offer can be made credibly without breaking the mechanism. (INST §6.2)
The untaxed pool. Approximately $286 trillion in global household wealth sits in Tier 4 and Tier 5 governance systems (primarily electoral autocracy and closed autocracy) that cannot access it cooperatively through the self-defeating dynamic: the wealth-holding population in those systems is also the governing coalition’s support base, making large-scale cooperative wealth taxation equivalent to regime suicide. A further $228 trillion in Tier 1 and Tier 2 systems has been inaccessible through prior wealth tax mechanisms for the three political failure reasons POL identifies. (INST §3)
Four conditions for a stable large-scale wealth tax. (1) No accurate external valuation required — the WDT’s self-declaration architecture; (2) cooperation must be the path of least resistance — the tolerant zone and must-transfer rule; (3) the refund guarantee must be constitutionally protected against regime discretion — the fiscal sovereignty test (an institution with effective blocking authority over a primary revenue instrument is not compatible with undivided executive sovereignty); (4) the taxable population must not be the governing coalition — the DR lottery mechanism. (INST §5)
Three-stage exclusion argument. Predatory and electoral autocracies face hard structural exclusion through the self-defeating dynamic. Developmental authoritarian systems (the genuinely difficult case) face endogenous institutional pressure: attempting to satisfy all four conditions generates the two-constituency accountability coalition and narrows the institutional distance between “stable WDT equilibrium” and democratic governance with each assessment cycle. China’s trajectory from the Deng-to-Hu period to the post-2012 Xi era illustrates this as a case consistent with the predicted mechanism: the August 2026 National Defence Mobilisation Law revision explicitly reserves executive authority over economic resources in circumstances the state defines, making Condition 3 and the refund guarantee structurally incompatible in statute. The WDT without the labour dividend is not a stable authoritarian equilibrium either: it fails to create the majority constituency that provides organised defence against the three failure mechanisms POL identifies. (INST §6)
Three competitive advantages for democratic WDT adopters. (1) Access to the resource pool ($228 trillion in democratic systems + potential from the $286 trillion in authoritarian systems if the governance argument holds); (2) narrowing the authoritarian endurance asymmetry through the welfare floor effect (the majority’s position is no longer the adjustment variable in a fiscal emergency); (3) pre-built crisis capacity through SWF accumulation. All three are Tier B claims requiring Phase One verification. (INST §7)
Epistemic status. The paper maintains an explicit three-tier taxonomy: Tier A (demonstrated results from mechanism papers and external empirical literature), Tier B (derived implications requiring Phase One or comparative case study verification), Tier C (hypothetical evolutionary claims). The China illustration is stated as consistent with the predicted mechanisms but explicitly not a confirmed pattern from a single case. (INST §0.03 revision note)
ADD: Implementation Calibration Examples
Eight implementation questions the design papers leave open, each with an approach sketch showing the shape of what a genuine answer requires. The sketches are illustrative of the reasoning a genuine answer would need — not specifications to be adopted without proper expert analysis.
Exemption threshold indexation. Nominal threshold produces threshold drift as asset prices rise; requires automatic indexation to a composite wealth appreciation index and a mandatory extraordinary review trigger when the TP enrolled population exceeds a defined % of adults.
TP Chamber conflict of interest visibility. The Allocator’s pre-vote publication for TP-initiated proposals should include an assessment of the initiating coalition’s direct financial interest in the outcome, calculated when the estimated aggregate direct financial benefit exceeds a defined multiple of their aggregate annual WDT liability.
External chamber communication rules. The Administrator’s mandatory output cycle should include a standing clarification distinguishing formal deliberative sources (Allocator, Administrator, DR forum) from external communications by other chamber members, which carry no special analytical authority by virtue of their origin.
DR-eligible pool monitoring. Quarterly publication of the pool size as a proportion of total adults, alongside the volunteer rate; a secondary trigger (distinct from the constituency dissolution trigger) when the pool falls below a defined proportion.
The consumption delta. The apparent gap closes under closer analysis: expenditure flowing to above-threshold individuals enters their delta; expenditure flowing to below-threshold individuals achieves the terminal goal directly. Two narrow qualifications: import leakage (addressed through τ_f agreement expansion) and foreign sovereign enterprises (τ_f is the correct mechanical response).
SWF asset composition monitoring. Stewardship statement to include portfolio composition by asset class against the Phase One baseline, with a mandatory composition review triggered when any single non-traditional category exceeds a defined proportion of total assets.
Phase One measurement framework as binding standard. The PHASE1 evaluation designs should be formally adopted by Governing Council vote before Phase One data begins accumulating, establishing in advance what evidence would update which working assumptions in which direction.
Bootstrapping facility. A time-limited, interest-bearing bridge loan from a public institution to the SWF Custodian, repayable from accumulated WDT revenue and subordinated to refund obligations, can collapse the vulnerability window while remaining consistent with enumerated structural clause 4 — provided the facility is interest-bearing (not grant-funded), contractually subordinated before drawdown, and the net SWF position published separately from the gross asset figure for the facility’s duration.
Open Questions Register
Items not listed here are settled. Items listed under Closed have been resolved by a completed paper and are retained for audit trail only.
Closed Literature Gaps (resolved by completed papers)
| # | Question | Closed by |
|---|---|---|
| 1 | Domar-Musgrave formal extension to a progressive delta base (three complications: net worth base, progressive rates, multi-period rate asymmetry) | WFR §3.2, §4.1; WFR.A §A.4, §B |
| 2 | Welfare comparison including delta base alongside existing candidates | WFR §3, §4; WFR.A §A–§D |
| 3 | Distributional arithmetic of delta-base concentration under persistent return heterogeneity | WFR §4.3; WFR.A §D |
Confirmed Literature Gaps (formal modelling required; separable from Phase One)
| # | Question |
|---|---|
| 7 | Causal framework for wealth tax abolition (POL §3 three-mechanism framework not independently validated as formal political economy model; INST §10 Cluster 4 assigns external collaborative research) |
| 8 | International competitive dynamic at the political level (INST §6 provides the most developed treatment; formal comparative political economy modelling outstanding) |
| 9 | Minimum-tax floor interaction with refund-based systems in treaty law |
Phase One Empirical Questions (unanswerable before a live system)
| # | Question |
|---|---|
| 4 | Cooperative compliance at ultra-high-net-worth level (professional intermediary mediation of compliance decisions); also FAL H3’s core empirical input |
| 5 | Cross-base migration externality magnitude (Agrawal et al. 2025 six-to-one ratio applied to WDT population) |
| 6 | Administrative-layer intervention effects on compliance psychology |
| 13 | Valuation route and assessment window adoption distribution; flexibility levy calibration |
| 14 | OBR independence adequacy as WDT mandate-guardian |
| 15 | Corporate instrument transition: conditions for CIT displacement question to become a policy decision |
| 16 | Housing price net effect (demand composition shift; net price level ambiguous) |
| 18 | SRR floor calibration implication of mild-overstatement equilibrium (α ≈ 1.1 population centre; ENV §2 identifies the upward SRR adjustment if confirmed) |
| 29 | Monitoring instrument for population distribution of α (mild-overstatement drift detection) |
| 30 | Bootstrapping problem: Phase One vulnerability window mitigation sufficiency; also FAL H3’s most acute falsification territory |
| 31 | Whether Tier 3 (developmental authoritarian) states attempting WDT implementation face the endogenous institutional pressure INST §6.2 predicts (INST OQ, comparative political economy research programme) |
| 32 | Whether the predicted adoption diffusion pattern (Option A–D dynamics) emerges under competitive pressure (INST OQ; untestable before Phase One produces demonstrable outcomes) |
Assigned to MACRO (Phase One successor; requires live data)
| # | Question |
|---|---|
| 11 | Consumption multiplier magnitude and net bias direction of RATES estimates |
| 12 | Automation and tax-base migration under different automation trajectories |
Governing Council Calibration Parameters (settled in kind, open in value)
| # | Question |
|---|---|
| 10 | SWF governance Phase One parameters (DR floor size, constituency dissolution triggers) |
| 17 | τ_0 × W_min joint surface — the only item in this group resolvable without Phase One data; the next analytical deliverable not requiring live data |
| 19 | Liquidity threshold for thinly traded company reclassification |
| 20 | τ_0 exact calibration (collection-security floor; 1–2 assessment cycles) |
| 21 | τ_h exact calibration within [deterrence floor, τ_m]; ramp pace; joint calibration with CIT/dividend displacement |
| 24 | Assessment window premium exact calibration (deferral charge + flexibility levy coefficients) |
Jurisdiction-Specific and Institutional Preconditions (not design gaps)
| # | Question |
|---|---|
| 22 | τ_f diplomatic rate-setting (bilateral/multilateral agreement) |
| 23 | Route D auction implementation details (conduct rules, no-bid fallback, timeline, international assets) |
| 25 | Derivatives valuation methodology for illiquid positions |
| 26 | HMRC data access agreement for microsimulation |
| 27 | Post-Brexit information exchange gaps (DAC loss, EU-domiciled structures) |
| 28 | Constitutional/legal analysis of Route D auction trigger in specific jurisdictions |
Item #33 — Route D realisation event flow and LRR capitalisation window impact
The RATES TCM models all taxpayers as generating annual delta revenue in each assessment period. Route D taxpayers generate no annual revenue during the holding period; all settlement defers to a realisation event. The fiscal consequence for the LRR fill timeline depends on the annual flow of Route D realisation events during the capitalisation window — a quantity the TCM does not model.
The required data exists in principle across three sources: ONS mortality data cross-referenced with the upper-tail wealth distribution (deaths trigger inheritance settlement); HMRC transaction data on private company sales and commercial property disposals (the principal Route D asset classes); and the inheritance and estate settlement record. This is a pre-Phase-One analytical deliverable requiring only existing administrative datasets, not live WDT data.
The SRR year-3 fill invariance result is not affected: the SRR target scales with observed net revenue and fills in approximately three years regardless of the revenue level. The LRR fill timeline is sensitive, since the LRR floor is fixed in real terms and does not scale with observed revenue. The degree of LRR timeline extension is proportional to the share of Route D wealth not realising within the capitalisation window. Given observed mortality rates and private asset transaction frequencies, the realistic effect is materially smaller than the theoretical upper bound and concentrated in the early capitalisation years.
Status: Pre-Phase-One analytical deliverable. Requires HMRC data access agreement (OQ #26) for full microsimulation; directional estimate constructible from publicly available ONS and transaction data before that agreement is in place.
Assigned to: Pre-Phase-One analytical work; RATES.A extension.
Item #34 — Population-weighted revenue calculation across the predicted α distribution
The TCM assumes α = 1 throughout. The behavioural analysis predicts a population centre modestly above honest declaration. No paper computes revenue under a population-weighted declaration distribution by bracket. The direction of the effect is argued in RATES §9.7 — systematic understatement and overstatement both produce higher annual revenue than the α = 1 baseline — but the magnitude is not quantified.
The required extension is straightforward within the existing model infrastructure: partition each RATES bracket by a distribution of α values, run the TCM at each α, and weight by the predicted population density. The predicted mild-overstatement centre and the portfolio anchor constraint derived in VAL §7.5 together bound the plausible α distribution for each bracket.
Status: Closable without Phase One data using existing model infrastructure.
Assigned to: RATES.A extension; SWEEPS follow-on.
Summary observations
- 3 confirmed literature gaps remain open requiring formal modelling or comparative case study work. Gaps #1–3 (D-M extension, welfare comparison, concentration arithmetic) are now closed by WFR.
- 12 Phase One empirical questions cannot be resolved without live system data. Items 4–6 and 30 are the most consequential for Phase One design. Two new items (#31, #32) were added by INST. The Agrawal cross-base externality (#5) is the dominant empirical qualification on all pre-behavioural revenue figures.
- 2 MACRO items require Phase One data before modelling can be calibrated.
- 6 Governing Council calibration parameters are settled in kind, open in value. Item #17 (the τ_0 × W_min joint surface) is the only item in any category resolvable without Phase One data; it is the next analytical deliverable.
- 6 jurisdiction-specific items are not design gaps; resolution requires legal analysis, diplomatic process, or institutional negotiation.
- The most consequential calibration problem is the τ_0 cross-dataset tension: higher τ_0 accelerates LRR fill and brings the overstater correction earlier, but also raises entry burden. No setting simultaneously optimises all three. Item #17 is the next deliverable.
- The most consequential outstanding deliverable is Phase One implementation itself: items 4–6, 29, 30 cannot be resolved by any further desk research.
- FAL adds precision to what “Phase One answering” these questions would require: minimum model specifications, falsification conditions, and the three-category epistemic taxonomy for evaluating results.