The thresholds — £325,000, £500,000, £1 million
Inheritance Tax is only charged on the value of an estate above a tax-free threshold. There are two allowances that build it up:
| Allowance | Amount | When it applies |
|---|---|---|
| Nil-rate band | £325,000 | Everyone — on any assets |
| Residence nil-rate band | up to £175,000 | When you leave your home to children or grandchildren |
| Both together | up to £500,000 | One person leaving a home to direct descendants |
| A married couple / civil partners | up to £1 million | Unused allowances pass to the survivor |
Tax is then charged at 40% on the value above your threshold — not on the whole estate. For example, an estate of £400,000 with a £325,000 nil-rate band pays 40% on the £75,000 over the threshold, which is £30,000. Both thresholds are frozen until 2030, which means more estates will gradually be pulled in as house prices rise.