UK Inheritance Tax Calculator

Inheritance Tax catches many families by surprise, partly because property values have risen faster than the tax-free allowances, and partly because the rules around the residence nil-rate band and charity gifts are not widely understood. This calculator estimates the Inheritance Tax due on an estate, using the nil-rate band, the residence nil-rate band, and the reduced rate for charitable giving.

How to use the Inheritance Tax calculator

Enter the total value of the estate, any amount left to a spouse or civil partner (which is fully exempt), the value of the main residence, and whether it is being left to children or grandchildren. Add any gifts made within 7 years of death and any amount left to charity. The calculator works out the nil-rate bands that apply, the taxable estate, and the Inheritance Tax due, at either the standard 40% rate or the reduced 36% rate if enough is left to charity.

How the calculation works

Every estate gets a nil-rate band of £325,000, tax-free before the standard rate applies. If the main residence is left to direct descendants, a further residence nil-rate band of up to £175,000 can apply, giving a combined allowance of up to £500,000 for many families. This residence nil-rate band tapers away for estates worth more than £2 million, reducing by £1 for every £2 the estate exceeds that threshold, and disappears entirely for very large estates.

Anything left to a spouse or civil partner is deducted before these nil-rate bands are even applied, since it is fully exempt. Gifts made within 7 years of death are added back into the estate for tax purposes. Once the taxable estate is worked out, it is taxed at 40%, or at a reduced 36% if 10% or more of the estate above the nil-rate bands is left to charity.

Worked example

Take an estate worth £800,000, with a £400,000 main residence left to the deceased's children, and no spouse exemption or charity gifts.

The residence nil-rate band applies in full at £175,000, since the residence is worth more than that and is left to direct descendants. Combined with the standard £325,000 nil-rate band, that gives a total tax-free allowance of £500,000. The remaining £300,000 is taxable at 40%, giving Inheritance Tax of £120,000, leaving £680,000 to pass to the beneficiaries.

Now try the same figures in the calculator above but leave the residence to someone other than a direct descendant, such as a sibling or friend. The residence nil-rate band no longer applies, the tax-free allowance drops to £325,000, and the Inheritance Tax bill rises substantially, showing just how valuable this relief is when it applies.

Ways people commonly plan around Inheritance Tax

A number of well-established, legitimate approaches can reduce a future Inheritance Tax bill, though all of them work best when planned well in advance rather than as a last-minute fix. Making use of annual gift allowances, currently £3,000 a year free of Inheritance Tax consideration, lets money move to the next generation gradually without it counting as a 7-year gift. Regular gifts made out of surplus income, rather than capital, can also fall outside the estate immediately if they meet HMRC's specific conditions.

Life insurance written in trust is another common tool: the payout sits outside the estate and can be used by beneficiaries to cover an Inheritance Tax bill without needing to sell property or other assets quickly under pressure. Pensions also sit outside most people's estates for Inheritance Tax purposes in many circumstances, which is one reason financial advisers often suggest drawing retirement income from other savings first and leaving pension pots untouched for longer where that fits the wider plan.

None of these approaches suit every family, and getting them wrong, for example by not surviving 7 years after a large gift, can leave an estate no better off than doing nothing at all. This is exactly the kind of decision worth discussing with a solicitor or financial adviser rather than acting on a general guide alone.

Common mistakes to avoid

A frequent mistake is assuming the residence nil-rate band applies automatically to any property in an estate. It only applies when the main residence is left specifically to direct descendants, children, grandchildren, or their spouses, not to other relatives, friends, or a trust in most circumstances. Leaving a home to a sibling or a favourite nephew, however well intentioned, does not unlock this allowance.

It is also easy to overlook how gifts within 7 years of death affect the calculation. Large gifts made shortly before death are often brought back into the estate for tax purposes, which can push a seemingly modest estate over the nil-rate band unexpectedly. Keeping a record of significant gifts, including the date they were made, makes it much easier for executors to work out the correct position later.

Finally, do not assume this calculator, or any general guide, replaces proper estate planning. Business relief, agricultural relief, trusts, and gifts with reservation of benefit can all change an estate's Inheritance Tax position significantly, and these are genuinely complex areas where a solicitor or financial adviser adds real value.

Related calculators

If you are planning ahead for other taxes on assets, our Capital Gains Tax calculator covers tax on selling property or shares, our Income Tax calculator breaks down tax by band, and our dividend tax calculator covers tax on dividend income. If you are thinking about the cost of passing on property to the next generation, our first home cost guide covers the other side of property costs, for those buying rather than inheriting.