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Inheritance Tax Calculator - find out what you owe in minutes.

Two free calculators built by dual-qualified IHT solicitors. Choose the one that fits your situation below and get an instant result.

GETTING STARTED

Which Inheritance Tax calculator do you need?

It depends on whether you’re planning for the future or dealing with a death that has already happened. Both calculators use the same underlying tax rules – the difference is the perspective.

I'M PLANNING AHEAD FOR MY OWN ESTATE

Estate Planning IHT Calculator

Find out what Inheritance Tax your family could face on your estate – and what you could do now to reduce it. You’ll get an instant risk profile and a list of planning options that apply to your situation.

SOMEONE HAS DIED AND I'M SORTING THEIR AFFAIRS

Executor's IHT Calculator

Work out what Inheritance Tax is owed on an estate you’re administering. Enter details of the estate’s assets, debts, and any gifts, and get an instant estimate plus the payment deadline that applies.

Not sure yet, or want full advice?

Both tools give an estimate, not a final figure. For a precise calculation or full estate administration support, our Estate Planning and Bereavement teams handle this every day. Click the button, submit your details and we’ll have an expert call you back.

THE BASICS

UK inheritance tax thresholds, explained

Before using either calculator, it helps to understand the tax-free thresholds that determine whether Inheritance Tax is due at all – and how much.

Nil-Rate Band (NRB)
£325,000

Every UK-domiciled individual has this allowance. Any estate value below this threshold is not subject to inheritance tax. Frozen until at least April 2030.

Residence NIL-rate band (RNRB)
£175,000

Available when a main residence is left to direct descendants – including children, stepchildren, and grandchildren. Subject to a taper for estates over £2 million.

Individual maximum threshold
£500,000

By combining both allowances, a single person can pass up to £500,000 free from IHT – provided the estate qualifies for the residence nil-rate band.

Married Couples’ Max Threshold
£1 million

Unused nil-rate band and RNRB transfer to a surviving spouse or civil partner, potentially doubling the tax-free amount on second death.

Important:

The NRB freeze now runs to April 2031, pulling more estates into the IHT net as property values rise. From April 2026, Business Property Relief (BPR) and Agricultural Property Relief (APR) are capped at £2.5 million for full relief. From April 2027, pension funds will be included in estates for IHT purposes. If any of these apply to you, early professional advice is now more important than ever.

IHT EXPLAINED

How is Inheritance Tax calculated?

HMRC uses the same five-step process for every estate. Our calculators follow this exactly.

1. Value the estate

Add up everything the deceased owned at open market value: property, savings, investments, personal possessions, and any life insurance not written in trust. Deduct outstanding mortgages, loans, credit card balances, utility bills, and reasonable funeral expenses.

2. Remove exempt assets

Deduct any assets passing to a surviving spouse or civil partner (fully exempt, no upper limit), registered charities, and qualifying business or agricultural assets – which may attract 100% or 50% relief under Business Property Relief or Agricultural Property Relief.

3. Apply the Nil-Rate Band

The first £325,000 of the taxable estate is free of IHT. If the deceased was widowed and their late spouse’s NRB was unused, this doubles to £650,000. Gifts made in the 7 years before death may reduce the available NRB.

4. Apply the Residence Nil-Rate Band

If the deceased’s main home passes to direct descendants, an additional allowance of up to £175,000 per person applies. This can be up to £350,000 for widows or widowers with a transferable allowance. The RNRB tapers away at £1 for every £2 the estate exceeds £2 million.

5. Charge IHT at 40% on the remainder

The standard inheritance tax rate of 40% is charged on whatever remains above the combined threshold. If the deceased left 10% or more of the net estate to charity, the rate on the taxable portion reduces to 36%. The executor is responsible for paying this to HMRC – typically within 6 months of the date of death.

BEFORE YOU START

What information do you need to use the calculator?

Having these details to hand before you start will give you a more accurate result. Estimates are fine – the calculators are designed for real people, not accountants.

Estate Value

The approximate total market value of all assets – property, savings, investments, and personal possessions. Include any life insurance not held in trust.

Debts and liabilities

Outstanding mortgage balances, personal loans, credit cards, and reasonable funeral costs. These are deducted before IHT is calculated.

Residential property details

The property value and whether it passes to children or grandchildren – this determines whether the Residence Nil-Rate Band applies.

Marital status & widowhood

Whether the person is (or was) married or in a civil partnership, and whether the late spouse’s allowances were used – these can significantly reduce the IHT bill.

Gifts made in the last 7 years

Significant gifts of cash, property, or assets. These may form part of the taxable estate if made within 7 years of death, though taper relief reduces the tax on older gifts.

Business or agricultural assets

Qualifying business interests, shares in unlisted companies, or agricultural land. These may attract 100% relief under Business Property Relief or Agricultural Property Relief.

Get your result in minutes - then talk to a specialist

Both calculators are free, take under 3 minutes, and need no registration. If the result raises questions, our team is here to help.

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Inheritance tax - FAQs

HMRC charges Inheritance Tax at 40% on the value of an estate above the available tax-free threshold. The calculation follows five steps: value all assets and deduct debts; remove exempt assets (spouse exemption, charities, qualifying business assets); subtract the Nil-Rate Band (£325,000 per person, or £650,000 if a transferable NRB is available from a deceased spouse); subtract the Residence Nil-Rate Band if a home passes to direct descendants; then charge 40% on whatever remains. If 10% or more of the estate goes to charity, the rate on the rest drops to 36%.

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