Inheritance tax calculator — what would your estate owe?

A quick estimate using the real rules: the £325,000 nil-rate band, the £175,000 residence nil-rate band (with the £2m taper), a late spouse's transferred allowances, the 36% charity rate — and the 2027 change that brings unused pensions into the taxable estate. Your figures never leave your browser.

How the allowances work

Everyone has a £325,000 nil-rate band (frozen since 2009). Passing your home to children or grandchildren adds the £175,000 residence nil-rate band, tapered away by £1 for every £2 the estate exceeds £2m. A surviving spouse's estate can use up to 100% of the late partner's unused bands — up to £1m of combined allowances. Everything above the allowances is taxed at 40%, or 36% when at least 10% of the net estate goes to charity. From 6 April 2027, unused pension funds count in the taxable estate (Finance Act 2025) — this calculator applies that rule.

Lifetime gifts within seven years, trusts, business and agricultural relief, and life policies written in trust all change the answer — the full Hundred Summers plan models each of them, projects your estate and the bill across your lifetime, and shows what mitigation is worth. Free to start, data stored only on your device.