Inheritance Tax Calculator UK – Estimate Your IHT

How to Calculate Your Inheritance Tax Liability

Inheritance Tax is charged on your estate when you pass away if its value exceeds the available threshold. Your estate includes all property, money, investments, and possessions.

1. Add up all your assets including property, savings, investments, and personal possessions
2. Subtract any outstanding debts, mortgages, and liabilities
3. Apply the nil-rate band (currently £325,000) and residence nil-rate band if applicable
4. Calculate tax at 40% on the amount above the threshold (or 36% if leaving 10%+ to charity)
5. Deduct any exemptions such as transfers to spouse/civil partner or charity

Nil-Rate Band and Thresholds

The standard nil-rate band is £325,000 for the 2024/25 tax year. This means no Inheritance Tax is due on the first £325,000 of your estate.

Residence Nil-Rate Band (RNRB): An additional allowance of up to £175,000 applies when you leave your main residence to children, stepchildren, adopted children, foster children, or grandchildren. This is tapered away for estates worth more than £2 million.

Transferable Allowance: If you’re married or in a civil partnership, any unused nil-rate band from your deceased spouse or partner can be transferred to you, potentially doubling your threshold to £650,000 or even £1 million when combined with the residence nil-rate band.

Exemptions and Reliefs

Several exemptions can reduce or eliminate your Inheritance Tax liability:

• Spouse/Civil Partner Exemption: Transfers between spouses or civil partners are completely exempt from Inheritance Tax, regardless of value
• Charitable Donations: Gifts to registered charities, political parties, and certain national institutions are exempt. If you leave 10% or more of your net estate to charity, the tax rate on the remainder reduces from 40% to 36%
• Annual Exemption: You can give away £3,000 per year without it counting towards your estate. Unused allowance can be carried forward one year
• Small Gifts: Gifts of up to £250 per person per year are exempt
• Wedding Gifts: £5,000 to children, £2,500 to grandchildren, £1,000 to others
• Regular Gifts from Income: Regular payments from your surplus income are exempt if they don’t affect your standard of living
• Business Property Relief: Up to 100% relief on qualifying business assets and shares
• Agricultural Property Relief: Up to 100% relief on agricultural property

The Seven-Year Rule

Gifts made during your lifetime may be subject to Inheritance Tax if you pass away within seven years of making them. This is known as a Potentially Exempt Transfer (PET).

Taper Relief: If you survive between 3-7 years after making a gift, taper relief reduces the tax charged:

• 0-3 years: 40% tax rate applies
• 3-4 years: 32% tax rate (20% reduction)
• 4-5 years: 24% tax rate (40% reduction)
• 5-6 years: 16% tax rate (60% reduction)
• 6-7 years: 8% tax rate (80% reduction)
• 7+ years: No tax (gift is fully exempt)

Gifts with reservation (where you continue to benefit from the gifted asset) remain part of your estate regardless of timing.

Strategies to Reduce Inheritance Tax

• Make Early Gifts: Give assets away early to benefit from the seven-year rule
• Use Annual Exemptions: Maximise the £3,000 annual exemption and other gift allowances
• Life Insurance: Take out a life insurance policy written in trust to cover the tax bill without adding to your estate
• Pension Planning: Pensions are generally outside your estate for Inheritance Tax purposes
• Charitable Giving: Leave 10% or more to charity to reduce the rate from 40% to 36%
• Trust Arrangements: Place assets in trusts to remove them from your estate
• Spend and Enjoy: Using your assets during your lifetime reduces your estate value
• Business Assets: Invest in assets that qualify for Business Property Relief

Common Scenarios

Scenario 1: Single Person
Estate value: £450,000, leaving home to children.
Threshold: £325,000 (nil-rate band) + £175,000 (residence nil-rate band) = £500,000
Tax due: £0 (estate is below threshold)

Scenario 2: Married Couple
First spouse dies leaving everything to surviving spouse. Estate value: £400,000.
Tax due: £0 (spouse exemption applies)
When second spouse dies with estate of £800,000:
Combined threshold: £650,000 (doubled nil-rate band) + £350,000 (doubled residence nil-rate band) = £1,000,000
Tax due: £0 (estate is below combined threshold)

Scenario 3: Estate with Charitable Gift
Estate value: £500,000, leaving £50,000 to charity.
Net estate: £450,000, threshold: £325,000
Taxable: £125,000
Charitable donation is 11.1% of net estate (above 10%), so reduced rate applies:
Tax due: £125,000 × 36% = £45,000 (instead of £50,000 at 40%)

Valuing Your Estate

Accurate valuation is essential for calculating Inheritance Tax correctly. Here’s what to include:

Property: Use market value on the date of death. For jointly owned property, include your share based on ownership type (joint tenants or tenants in common).

Savings and Investments: Contact financial institutions for exact values. Include ISAs, stocks, shares, and unit trusts.

Personal Possessions: Value items at realistic selling price. Professional valuations may be needed for antiques, jewellery, artwork, or collectibles worth significant amounts.

Vehicles: Use online valuation tools or professional valuers for cars, motorcycles, boats, and caravans.

Digital Assets: Include cryptocurrency, domain names, and other digital property.

Debts: Deduct mortgages, loans, credit cards, and bills outstanding at death. Funeral expenses can also be deducted.

Reporting Requirements

Even if no Inheritance Tax is due, you may need to report the estate’s value to HMRC. The specific forms required depend on the estate’s circumstances:

• Excepted Estates: Some estates below the threshold qualify as ‘excepted estates’ and have simplified reporting requirements
• IHT400: Full Inheritance Tax account required for larger or complex estates
• Probate Application: You’ll need to estimate the estate’s value when applying for probate, even if below the tax threshold

The executor must settle any Inheritance Tax due before probate can be granted. This can create cash flow challenges, particularly with property-rich estates.