Inheritance Tax (IHT) is one of the most misunderstood UK taxes. While many people believe it only affects the very wealthy, rising property prices and frozen tax thresholds mean that more estates are now caught by inheritance tax calculations than ever before.
Understanding how inheritance tax is calculated — and how allowances, reliefs, and exemptions work — is essential for anyone planning their estate, acting as an executor, or expecting to inherit assets. It is equally important to understand how inheritance tax differs from other taxes, particularly capital gains inheritance tax, a phrase often used when people are unsure how Capital Gains Tax (CGT) applies to inherited assets.
This guide provides a detailed explanation of UK inheritance tax calculations, with practical examples and clear explanations of allowances, reliefs, and the interaction between inheritance tax and capital gains tax.
Inheritance Tax is a tax charged on the value of a person’s estate when they die. The estate includes everything the deceased owned or had an interest in, such as:
Property (including the family home and rental properties)
Cash, savings, and ISAs
Investments, shares, and bonds
Business interests
Personal possessions (cars, jewellery, artwork)
Certain lifetime gifts
The standard inheritance tax rate is 40%, but it is only applied to the portion of the estate that exceeds available tax-free allowances.
Inheritance tax calculations in the UK generally follow these steps:
Value the estate at the date of death
Deduct allowable debts and liabilities
Add back chargeable lifetime gifts
Apply available allowances and exemptions
Apply any relevant reliefs
Calculate the tax due at the appropriate rate
Each stage can significantly affect the final inheritance tax bill.
The starting point for inheritance tax calculations is establishing the open market value of all assets at the date of death.
Property must be valued at its market value, not its purchase price
Investments are valued at market value on the date of death
Bank accounts are valued at the balance on the date of death
Personal possessions are included at realistic resale values
HMRC expects valuations to be reasonable and justifiable. Incorrect or undervalued assets may lead to penalties or investigations.
Once assets are valued, certain debts can be deducted, including:
Mortgages
Personal loans
Credit card balances
Funeral expenses
Outstanding household bills
After deducting these, you are left with the net estate value, which forms the basis of inheritance tax calculations.
Every individual has a nil-rate band of £325,000. This is the amount of the estate that is taxed at 0%.
If the net estate value is below £325,000, no inheritance tax is payable.
If a person dies and leaves everything to their spouse or civil partner, their nil-rate band is unused. It can be transferred to the surviving spouse, potentially doubling their allowance to £650,000.
The Residence Nil-Rate Band is an additional allowance designed to help families pass on the family home.
Currently worth £175,000 per person
Applies only if a qualifying residential property is left to direct descendants
Can be transferred between spouses and civil partners
Can increase the total tax-free allowance to £500,000 per person
The residence nil-rate band is reduced if the estate exceeds £2 million. For every £2 over this threshold, £1 of RNRB is lost.
This tapering makes inheritance tax calculations more complex for higher-value estates.
Transfers between UK-domiciled spouses or civil partners are completely exempt from inheritance tax, regardless of value.
This exemption allows many couples to defer inheritance tax until the second death, at which point combined allowances can be used.
Lifetime gifts play a major role in inheritance tax calculations.
Most gifts to individuals are PETs:
If the donor survives 7 years, the gift is outside the estate
If the donor dies within 7 years, the gift may become taxable
Taper relief reduces the tax payable, not the value of the gift:
3–4 years: 32% tax
4–5 years: 24% tax
5–6 years: 16% tax
6–7 years: 8% tax
Business Relief can reduce the value of qualifying business assets by 50% or 100% for inheritance tax calculations. This can apply to:
Shares in unlisted companies
Certain partnership interests
Some AIM-listed shares
Agricultural Relief may reduce the value of qualifying farmland and buildings by up to 100%, subject to strict conditions.
Gifts to UK-registered charities are exempt from inheritance tax. Additionally, if 10% or more of the net estate is left to charity, the IHT rate on the remaining estate is reduced from 40% to 36%.
Estate assets:
Main residence: £600,000
Savings and investments: £300,000
Personal possessions: £50,000
Total estate value: £950,000
Debts:
Mortgage: £100,000
Net estate: £850,000
Allowances:
Nil-rate band: £325,000
Residence nil-rate band: £175,000
Total allowances: £500,000
Taxable estate:
£850,000 − £500,000 = £350,000
Inheritance tax due:
£350,000 × 40% = £140,000
The term capital gains inheritance tax is commonly used, but it can be misleading.
No. Capital Gains Tax is not charged when someone dies.
Instead:
Assets are revalued to market value at the date of death
This is known as the “CGT uplift” or “rebasing”
This means gains made during the deceased’s lifetime are effectively wiped out for CGT purposes.
While there is no capital gains inheritance tax at death, CGT may apply after inheritance if the beneficiary sells an asset.
Property inherited at £500,000
Sold later for £560,000
Capital gain: £60,000
The beneficiary may need to pay CGT on this gain, subject to their annual CGT allowance and applicable tax rate.
This distinction is crucial when planning whether to gift assets during life or leave them via a will.
From a planning perspective:
Gifting assets during life may trigger CGT but reduce IHT
Passing assets on death may trigger IHT but eliminate lifetime CGT
Balancing inheritance tax calculations against capital gains tax exposure is a key part of effective estate planning.
Failing to claim transferable allowances
Incorrect property valuations
Overlooking lifetime gifts
Missing available reliefs
Confusing inheritance tax with capital gains inheritance tax
These mistakes can lead to overpaying tax or delays in probate.
Inheritance tax calculations can become complex when estates include:
Multiple properties
Business assets
Trusts
Overseas assets
Significant lifetime gifting
Professional advice helps ensure compliance with HMRC rules while minimising tax legally and efficiently.
UK inheritance tax calculations depend on a careful assessment of estate value, correct application of allowances, and a clear understanding of reliefs and exemptions. While inheritance tax and capital gains tax are closely linked in estate planning, they operate very differently — and confusing them can be costly.
With proper planning, many estates can significantly reduce inheritance tax, preserve family wealth, and provide clarity for beneficiaries at a difficult time.
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