Replace it with a 95% inheritance tax at death. Universal, with no asset-class exemptions, applied to all wealth transferred at death rather than to income earned during life.
Current Assessment
Income tax and National Insurance raised £475bn in 2024/25 — 55%+ of all UK tax receipts — entirely dependent on labour income, a base this project's Economic Renewal pillar argues is structurally eroding (AI displacement, capital reclassification, profit-shifting). UK household wealth stands at £10.8tn, growing at 5–7% a year, and is taxed at a fraction of the effective rate applied to labour. The proposal: replace income tax entirely with a 95% tax on all wealth transferred at death, phased in over two stages, protected by constitutional entrenchment against the kind of implementation capture that hollowed out Sweden's own inheritance tax between 1983 and 2004.
Evidence
Income tax and NI raised £475bn in 2024/25 — 55%+ of all tax receipts — entirely dependent on labour income. UK household wealth stands at £10.8tn, growing at 5–7% a year. The effective IHT rate on the largest estates falls to around 12% (against a 40% nominal rate) once Business Property Relief and the other mechanisms the Tax Avoidance pillar catalogues are applied, and more than two-thirds of that relief goes to around 400 estates a year.
The labour income base is shrinking (AI displacement, capital reclassification, profit-shifting to low-tax jurisdictions — each independently documented in the Tax Avoidance pillar) while the wealth base is both larger and taxed at a fraction of the effective rate applied to labour income. A tax system structurally dependent on the shrinking base while the expanding one goes largely untouched is not stable — this is this project's own connecting argument built on the independently-sourced facts above, not a finding any single source states on its own.
The causation above justifies a range of responses, not only this one: marginal reform of the existing 40% IHT (the path already underway — CGT raised to 24%, carried interest reform, the 2027 pension IHT change); an annual wealth tax rather than a transfer tax (the subject of its own dedicated comparison in Wealth Tax or Inheritance Tax?); the broader sequenced portfolio of instruments — land value tax, corporation tax reform, carbon pricing, financial transaction tax — set out in Revenue Architecture; or this proposal, a 95% transfer tax replacing income tax outright.
Choosing the 95% transfer-tax option over the marginal-reform or annual-wealth-tax alternatives reflects two value judgements this project makes explicitly rather than presenting as if they followed from the evidence alone. First, that limiting unearned intergenerational advantage matters more, at the margin, than protecting family inheritance as an unconditional right. Second, that structural permanence (a constitutional rate, an independent authority) is worth the transition cost and political difficulty, given the Swedish precedent of a nominally strong inheritance tax being hollowed out by incremental relief rather than reversed outright. A reader who weighs family continuity more heavily, or who judges incremental reform more politically durable than a constitutional one, is not wrong on the evidence — they are weighing the same facts against different values.
A 95% inheritance tax at death, universal and without asset-class exemption, phased in over two stages (60–70% on estates above £2 million, then the full rate), protected by constitutional entrenchment and an independent authority. The falsification test below is what would show this specific design — not just the rate, but the institutional protections around it — isn't working.
Assumptions
The numbers behind this claim, and the assumptions each one depends on, are set out in full in Revenue Architecture §8.1–8.2 — reproduced here rather than duplicated in different words:
- Whether Stage 1 closes the spousal exemption. Not currently specified. This is the difference between £10–12bn and £13–15bn a year in Stage 1 revenue, and a much larger share of the eventual base at full 95% scale.
- Wealth compounding at 5–7% a year through 2035–2045 without correction. The £200–450bn full-rate estimate assumes household wealth keeps growing at its recent rate through the transition window, undisturbed by a housing correction or by the reform's own effect on asset prices.
- The valuation architecture and constitutional protections actually hold. The top of the £200–450bn range assumes the reforms below prevent the effective rate drifting the way the current 40% system's has — down to 12–25% depending on estate size.
- The £1–4tn transition-gap range is a plausible span, not a costed scenario. No single year-by-year model has been published showing the gap opening and closing under stated assumptions.
- Almost all of this claim's revenue arrives late. ~£10–15bn/yr in Stage 1 against £200–450bn/yr once Stage 2 reaches the boomer peak — in the early years, the financing burden falls almost entirely on the other two mechanisms (phased income tax reduction, transition bonds), not on this claim's own revenue.
Stage 1's own number, computed directly from HMRC's 2023-24 estate-value-band data rather than left as an unquantified stage: applying the proposed 60–70% rate to the ~£17.4–21.1bn currently held in estates above £2m gives approximately £10–15bn a year — a small fraction of the £475bn being replaced.1
Falsification Test
Cross-Pillar Relationships
| Pillar | Connection |
|---|---|
| Public Debt | The Sovereign Wealth Mechanism (a separate claim — see below) receives a share of this claim's Stage 2 receipts as a volatility-smoothing stream, once the transition reaches that scale. |
| Demographics | Connected, 21 September 2026. Previously misattributed a "recycle into early-life public goods — housing, childcare, a citizen's endowment" idea to this pillar directly; corrected to read as Demographics' own proposal, honestly flagged there as unfunded, since this pillar's §4.1 allocates 100% of projected revenue to the income-tax replacement gap with nothing left over — see the Cross-Pillar Impact Map. |
| Housing | Describes this claim as "the comprehensive backstop" closing housing-wealth escape routes — a claim that only holds at Stage 2 scale, not during Stage 1's £10–15bn/yr window. |
| Agriculture | Not currently addressed anywhere in the Agriculture pillar, despite Business/Agricultural Property Relief being named for closure in the avoidance-architecture claim below, and despite Agriculture's own documented farm-succession crisis. Flagged, unresolved. |
Challenges
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Update History
- 15 September 2026 — Stage 1's revenue estimate computed for the first time, from HMRC's own 2023–24 estate-value-band data (previously unquantified). Numbers Ledger and Assumptions Register added to Revenue Architecture §8.1–8.2. See commit
a2dc4c2.