Applies to: United Kingdom
From 2027-04-06, unused pension funds come into the estate for inheritance tax. Every existing UK inheritance tax calculator leaves pensions out, correctly, because today they are outside the estate. This shows both worlds side by side, including the two interactions that make the real rate far higher than 40%.
| Reference rates, 2026-27 | Rate |
|---|---|
| Rest of UK personal allowance (up to £12,570) | 0% |
| Rest of UK basic (£12,571 to £50,270) | 20% |
| Rest of UK higher (£50,271 to £125,140) | 40% |
| Rest of UK additional (over £125,140) | 45% |
| Scottish higher | 42% |
| Scottish advanced | 45% |
| Scottish top | 48% |
Because the residence nil rate band is tapered on the size of the estate, and from 2027-04-06 the pension is part of that estate. The band is reduced by £ 1 for every £ 2 of estate above the taper threshold. It is gone entirely at £2,350,000 with one band, or £2,700,000 with two.
Follow what that does to a pound. While the taper is running, one more pound of estate adds a pound to the taxable figure and takes fifty pence off the band, so the taxable figure rises by one pound fifty. At 40% that is sixty pence of tax on one pound of pension. The marginal inheritance tax rate on the pension is 60%, not 40%, for as long as the taper is biting.
This is the calculation every existing tool gets wrong from April 2027, and it will not look wrong. Computing the taper on the estate without the pension is exactly right today and produces a plausible, confident, generous answer the day after the rule changes.
Because income tax is charged on the pension after inheritance tax has been taken, not on the whole of it. s.637T ITEPA 2003, as amended by s.70(5) Finance Act 2026, gives the beneficiary a deduction equal to the inheritance tax paid on their share. So beneficiary pension share minus the inheritance tax attributable to that share, and the income tax is marginal rate times the reduced figure.
Work it through at 40% inheritance tax and an additional rate beneficiary. Inheritance tax takes 40p of every pound. Income tax at 45% then applies to the 60p that is left, which is another 27p. That is 67p in total. Without the deduction it would be 85p.
The same arithmetic gives 52% for a basic rate beneficiary and 64% for a higher rate one. All three assume the member died at 75 or over and that no nil rate band is left to cover the pension. They are worst cases, not defaults.
The calculator will usually show you slightly less than those three, and that is the more accurate answer rather than a caveat. It apportions the inheritance tax across the chargeable estate at the estate rate, so the nil rate band shelters a proportionate slice of the pension along with everything else, and the combined figure rises towards 52, 64 and 67 as the estate grows and the band stops mattering. The published figures assume no band shelters the pension at all, which is true only for large estates.
The genuine worst case is 84%, and it needs both interactions at once. Inside the residence band taper the marginal inheritance tax rate on the pension is 60% rather than 40%. If the inherited income also lands in the personal allowance withdrawal band, the effective income tax rate on what is left is 60% rather than 40%. That is 60%, then 60% of the remaining 40%, which is 84%. Higher figures than that circulate in commentary. This page does not print one it cannot show the arithmetic for.
It may stop qualifying for the 36% rate. This is the consequence most likely to catch an existing will, and it is worth checking before April 2027 rather than after.
The reduced rate is tested per component, not across the estate. The estate splits into survivorship, settled property and general components, and pension property falls in the general one. Bringing the pension in enlarges that component, which enlarges its baseline amount, which raises the cash sum needed to reach 10%. A legacy drafted as a fixed amount that was exactly 10% of the baseline in 2026 can be short of it in 2027 without a word of the will changing.
One mechanism exists that is worth knowing about: components may be merged by election within two years of death.
Not settled in the law. Non-registered or excepted group life cover and An annuity with a guarantee element are recorded here as unresolved. This tool will not tell you how they are treated, because nothing does yet. The list of pension types it offers is not exhaustive either, and anything you cannot place against it should be treated as unsettled rather than assumed to be in scope.
Pending from HMRC. Guidance, manuals, forms and interactive tools are due spring 2027. The statutory instrument behind the reporting duties is SI 2026/818, laid 2026-07-15, in force 2027-04-06. Its draft proposed reporting of death in service benefits and that was removed before the final version, so anything written against the draft is out of date.
The payment deadline is 6 months and has not moved. The House of Lords Economic Affairs Finance Bill Sub-Committee recommended extending it to twelve months. The Government rejected that in its response of 30 March 2026. Twelve months is not a possibility to plan around.
Deliberately not built. Each of these is left out rather than quietly approximated:
One simplification inside what is built, stated so it is not mistaken for the full rule: the reduced rate test is applied to the estate as a single component rather than to each of the three separately. Separately, and not a simplification, the calculator shows two different figures for the inheritance tax on the pension. One is the tax apportioned to it at the estate rate, which is what the income tax relief is calculated on. The other is what the pension actually added to the bill. They differ whenever the taper is involved and both are worth seeing.
This tool computes and does not recommend. There is no suggestion here that anyone should draw down a pension, change a nomination or restructure a will. This is general information rather than financial, tax or legal advice, and estate planning turns on individual circumstances that no calculator sees.
Two dates decide almost everything here. The date of death, either side of 2027-04-06, and the age at death, either side of 75. Get those two right and the rest is arithmetic. The number worth looking at is not the inheritance tax, it is the combined rate on the pension once income tax has followed it.