How inheritance tax is worked out
Inheritance tax is charged at 40% on the value of an estate above the tax-free bands. Every estate has a £325,000 nil-rate band. On top of that sits a £175,000 residence nil-rate band, available when a main home passes to children or grandchildren, so a single person passing a home to their children can leave £500,000 tax-free. The residence band tapers away by £1 for every £2 the estate exceeds £2,000,000, disappearing once the estate reaches £2,350,000. Leave 10% or more of the net estate to charity and the rate on the taxable part drops to 36%.
The residence nil-rate band
The residence nil-rate band is an extra £175,000 of tax-free allowance on top of the £325,000 nil-rate band, given when your main home passes to children or grandchildren(including step, adopted and foster children). It is what lets a single person pass £500,000 tax-free, and a married or widowed person up to £1,000,000 by combining both partners’ bands. It only applies to a home left to direct descendants, so a home left to a sibling, a nephew or a friend does not qualify. The band also tapers away by £1 for every £2 an estate is worth over £2,000,000, so it is fully lost once the estate reaches £2,350,000. Like the nil-rate band, it is frozen until 5 April 2031.
Spouses, civil partners and the £1,000,000 figure
Anything left to a spouse or civil partner is exempt, so there is no inheritance tax on the first death. The survivor also inherits the unused percentage of both the nil-rate band and the residence band. That is where the widely quoted £1,000,000 comes from: two £325,000 nil-rate bands plus two £175,000 residence bands, passing a home to children. This calculator models the common full-transfer case. Partial transfers are possible where the first spouse used part of their bands, and gifts, trusts and business relief can change the picture further, so treat this as an estate-planning estimate and get professional advice for anything close to the threshold.
Lifetime gifts and the 7-year rule
This calculator models the estate at death, not lifetime gifts. In practice, gifts you make can reduce inheritance tax. Most gifts to other people are potentially exempt transfers: live for seven years after making the gift and it leaves your estate entirely. Die within seven years and the gift is counted back against your estate, though taper relief can reduce the tax on the part of a gift that sits above the £325,000 nil-rate band. Taper relief does not cut the tax on a gift that already falls within the band. On top of that, you can give away £3,000 each tax year under the annual exemption, plus small gifts and regular gifts out of income, with no seven-year clock. Gifts, trusts and business relief change the position, so use the figure here as the estate-at-death estimate and get advice before relying on a gifting plan.
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Simon is the founder of Orbit Money, a tool that helps people track subscriptions and recurring spend. He builds Orbit's free money calculators and writes about personal finance for UK and Australian readers.
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