Most estates pay nothing — the threshold is high, and it doubles for couples.
Every person can pass on £325,000 before any inheritance tax is due. If they leave their home to direct descendants, a further £175,000 residence nil-rate band can apply. Anything above the available bands is taxed at 40%.
Crucially, anything unused passes to a surviving spouse or civil partner. So a married couple can leave up to £1,000,000 between them before inheritance tax bites — which is why only about 4% of estates pay any at all.
A widow leaves an estate of £820,000, including the family home, to her two children.
She inherited her late husband's full unused bands. Her available thresholds: her own £325,000 + his transferred £325,000 + two residence bands of £175,000 each = £1,000,000.
Her estate is below that — so no inheritance tax is due. The transfer is claimed on form IHT402.
Informational, not advice. Confirm against GOV.UK before acting. Figure verified 17 Sept 2026.
Cite this figure: Valoren, “Inheritance Tax Threshold,” https://valoren.uk/figures/inheritance-tax-threshold (verified 17 Sept 2026).