Protect the rate constitutionally. Enshrine the rate in a document requiring a supermajority to amend, and create an independent IHT authority — modelled on a central bank, not a government department — to prevent the slow implementation capture that hollowed out Sweden's inheritance tax between 1983 and 2004.
Current Assessment
Sweden introduced a 100% inheritance tax on the largest estates in 1983 and abolished it entirely by 2004 — not through a single reversal but through two decades of incremental relief expansions and valuation concessions that hollowed the effective rate before formal abolition.1 This claim is the project's proposed architectural response: constitutional rate protection requiring a supermajority to amend; an independent IHT authority modelled on a central bank rather than a government department; real-time public transparency of every estate assessment and relief claimed; and an automatic escalation mechanism if the effective rate falls below the nominal rate by more than a defined threshold.
Evidence
The current 40% UK inheritance tax's own effective rate has already drifted to approximately 12% for estates over £30m through Business Property Relief and related mechanisms2 — direct, live evidence of the same erosion pattern this claim is designed to prevent, operating under the existing system today, without a 95% rate anywhere in the picture yet.
Assumptions
- Constitutional protection actually resists a determined future majority. A "supermajority to amend" raises the bar but does not make erosion impossible — the falsification test below is specifically about whether this holds in practice, not just in design.
- An independent authority modelled on a central bank is institutionally comparable. Central bank independence protects monetary policy from short-term political pressure; whether the same model transfers cleanly to tax administration, where the "policy" is a fixed rate rather than an ongoing judgement call, is asserted rather than demonstrated.
- The Swedish comparison is the right reference case. Sweden's erosion took two decades; this claim's own falsification test uses a five-year window specifically because it's "deliberately short" of that — an explicit acknowledgement that the analogy is being used cautiously, not literally.
Falsification Test
This claim shares its falsification test with the 95% inheritance tax claim — see that page for the full prediction, magnitude, time horizon, and falsification condition. The short version: if the effective rate on the largest estates falls materially below the legislated 60–70% Stage One band within five years despite these protections, that is evidence this specific design — not necessarily the rate itself — needs revision.
Cross-Pillar Relationships
| Pillar | Connection |
|---|---|
| 95% Inheritance Tax | Shares the same falsification test — this claim is the institutional design being tested, that claim is the rate. |
| Public Office Covenant | Radical financial transparency as a condition of public office is the mechanism that makes implementation capture politically visible and politically costly — a named cross-pillar dependency in Economic Renewal §8. |
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