Phase it in over two stages. Start at 60–70% on estates above £2 million to build administrative infrastructure and revenue evidence, then move to the full 95% rate as the institutional architecture proves out — only then beginning the phased income tax reduction.
Current Assessment
There's a sequencing problem: you can't prove inheritance tax revenue will arrive without bringing in the tax, and you can't responsibly bring in the full tax without proof of the revenue. The pillar's answer is a two-stage path, which it calls the most workable route. Stage One is 60–70% on estates above £2 million, with no income tax cut yet, and 5–7 years to build up revenue data, administrative systems, valuation methods and public acceptance. Stage Two uses that evidence to start cutting income tax step by step. This adds 5–10 years to the timeline compared with doing it all at once, and the pillar says so openly.
Evidence
Stage One's revenue estimate, worked out from HMRC's 2023–24 data on estates by value band, is roughly £10–15bn a year from a 60–70% rate on estates above £2 million (see the 95% inheritance tax claim for the full working), against the £475bn that income tax and NI raise now. No tax of this size has been brought in at UK scale in a single step, so there's no precedent for the administrative, valuation and public-acceptance systems a one-step introduction would need to get right from the first day.
You can't prove inheritance tax revenue will arrive at scale without bringing in the tax, but bringing in the full 95% rate without that proof risks the kind of fragile start that, as Sweden shows, can let even a high headline rate unravel over time (see the constitutional protection claim). Splitting it into two stages, proving the mechanism first at a lower rate on a smaller base and then scaling up once the evidence exists, is this project's own answer to that problem, not a finding from any single source.
Bring in the full rate in one step; ramp up in more than two steps; tie the move from Stage One to Stage Two to a specific evidence trigger instead of a fixed 5–7 year window; or this claim's two-stage design.
Choosing a slower two-stage path, gated on evidence, over a faster single step trades 5–10 more years of lower revenue and continued reliance on income tax for more administrative credibility and political durability. The pillar's own Key Point states that trade-off openly. A reader who puts more weight on the pressure on the wage-based tax base than on the risks of the transition might prefer a faster single step; they aren't wrong about the evidence, they weigh it differently.
Stage One: 60–70% on estates above £2 million, with no income tax cut yet, and 5–7 years to build the administrative systems, valuation methods, revenue evidence and public acceptance. Stage Two: use that evidence to start cutting income tax step by step. The move to Stage Two is gated on five published tests (Economic Renewal §4.5): the effective rate on estates above £10 million within 5 points of the legislated rate, revenue at least at the bottom of the forecast range for three years, avoidance no higher than forecast, enforcement working, and the rate protection in place. The OBR and the National Audit Office assess them and report to Parliament each year.
Assumptions
- Stage One's 5–7 year timeline holds. The plan assumes the administrative systems, valuation methods and public acceptance can all be built in this window. The evidence side of the timeline is now grounded: HMRC publishes inheritance tax figures about two years after each tax year, so five years of Stage One gives about three years of settled data. No separate evidence on how long the institutions take to build is cited.
- Stage Two follows from Stage One's evidence, not political timing. The five tests in Economic Renewal §4.5 say what evidence allows the move. They can't force it or forbid it: Parliament still decides, and the tests only make a decision against the evidence visible. The thresholds are the project's own judgement and haven't yet been checked against modelled Stage One revenue (Gap 1).
- Adding 5–10 years is acceptable. The pillar's own Key Point says this is slower than the full proposal and argues the extra credibility is worth it. That is a value judgement; the evidence alone doesn't settle it.
Cross-Pillar Relationships
| Pillar | Connection |
|---|---|
| 95% Inheritance Tax | Stage One's rate (60–70%) and its revenue estimate both belong to that claim, where they are worked out in full. |
| Constitutional Rate Protection | The pillar says the constitutional protections should be in place before the full rate applies, which means during Stage One, not after it. |
Challenges
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Update History
- 23 October 2026: The trigger for Stage Two is now defined: five tests, assessed by the OBR and the National Audit Office (Gap 8). Assumptions 1 and 2 updated. No change to the claim wording.
- 23 October 2026: Rewritten in plain prose. No change to the claim or its figures.
- 14 October 2026: Stage Two's destination changed from abolishing income tax to an income tax cut sized to proven inheritance tax revenue, after the wealth-transfer figures it relied on were corrected (see the 95% inheritance tax claim). The two-stage design itself is unchanged.
- 15 September 2026: Stage One's revenue estimate worked out and added for the first time. See commit
a2dc4c2.