Inheritance Tax Calculator
Estimate how much inheritance tax may be due on an estate in the UK. This calculator provides an approximation based on current HMRC rules.
How Is Inheritance Tax Calculated in the UK? (2024 Guide)
Inheritance Tax (IHT) is a tax on the estate (property, money, and possessions) of someone who has died. In the UK, IHT is one of the most complex taxes, with numerous exemptions, reliefs, and allowances that can significantly reduce or even eliminate the tax due. This guide explains exactly how inheritance tax is calculated, who needs to pay it, and how to legally minimise your liability.
1. The Basics of Inheritance Tax
Inheritance Tax is charged at 40% on the value of an estate above certain thresholds. However, most estates don’t pay IHT because:
- The first £325,000 of an estate is tax-free (the nil-rate band)
- Anything left to a spouse, civil partner, or charity is exempt
- There’s an additional £175,000 allowance if you leave your home to direct descendants (the residence nil-rate band)
- Many gifts made more than 7 years before death are exempt
For the 2023/24 tax year, only about 4% of UK deaths result in an IHT charge (source: HMRC).
2. Key Allowances and Thresholds
| Allowance | 2023/24 Value | Conditions |
|---|---|---|
| Standard Nil-Rate Band | £325,000 | Available to all estates |
| Residence Nil-Rate Band | £175,000 | Only if home left to direct descendants |
| Transferable Nil-Rate Band | Up to £325,000 | From deceased spouse/civil partner |
| Transferable Residence Band | Up to £175,000 | From deceased spouse/civil partner |
| Taper Threshold | £2,000,000 | Residence band reduces by £1 for every £2 over this |
The total possible allowance for a married couple/civil partners in 2023/24 is £1,000,000 (£325k + £175k × 2). This means estates valued below this threshold typically pay no IHT.
3. Step-by-Step Calculation Process
HMRC uses this sequence to calculate IHT:
- Value the estate – Include all assets (property, investments, possessions) minus debts/liabilities
- Subtract exemptions – Spouse transfers, charity donations, business/agricultural reliefs
- Apply nil-rate bands – Standard £325k + residence band if eligible
- Calculate taxable amount – Estate value minus allowances
- Apply 40% tax rate – On the taxable amount above thresholds
- Consider instalment options – Some assets (like property) can have tax paid in instalments
4. Common Exemptions and Reliefs
Several important exemptions can reduce or eliminate IHT:
| Exemption/Relief | Value | Key Rules |
|---|---|---|
| Spouse/Civil Partner Exemption | 100% | No IHT on assets left to UK-domiciled spouse/partner |
| Charity Exemption | 100% | No IHT on gifts to UK registered charities |
| Annual Gift Allowance | £3,000 | Can give this amount each year tax-free |
| Small Gifts | £250 | Unlimited number of £250 gifts to different people |
| Wedding Gifts | £1k-£5k | Depends on relationship to couple |
| Business Property Relief | 50%-100% | For business assets owned >2 years |
| Agricultural Relief | 50%-100% | For agricultural property |
The 7-year rule is particularly important: gifts made more than 7 years before death are completely exempt from IHT. Gifts made 3-7 years before death are taxed on a sliding scale (known as taper relief).
5. The Residence Nil-Rate Band Explained
Introduced in 2017, the Residence Nil-Rate Band (RNRB) provides an additional allowance when a home is left to direct descendants (children, grandchildren, etc.). Key points:
- Currently £175,000 per person (2023/24)
- Only applies to one residential property (or equivalent assets if the home was sold after July 2008)
- The property must be left to direct descendants
- For estates worth over £2 million, the RNRB is reduced by £1 for every £2 over the threshold
- Can be transferred between spouses/civil partners like the standard nil-rate band
Example: A married couple with an estate worth £900,000 (including a £400,000 home left to their children) would have:
- Standard nil-rate band: £325,000 × 2 = £650,000
- Residence nil-rate band: £175,000 × 2 = £350,000
- Total allowance: £1,000,000
- Taxable estate: £900,000 – £1,000,000 = £0 (no IHT due)
6. When Inheritance Tax Must Be Paid
IHT is typically due within 6 months of the end of the month in which the death occurred. Interest is charged on late payments. Some key payment rules:
- Tax on cash/assets is due immediately
- Tax on property can be paid in 10 annual instalments (with interest)
- The personal representatives (executors) are responsible for paying IHT before distributing the estate
- IHT must be paid before probate is granted in most cases
For complex estates, it’s advisable to work with a probate solicitor or tax advisor to ensure accurate calculations and timely payments.
7. How to Reduce Inheritance Tax Legally
With proper planning, it’s possible to significantly reduce or even eliminate IHT. Some effective strategies include:
- Make use of annual exemptions – Give away £3,000 per year plus small gifts of £250
- Set up trusts – Certain trusts can remove assets from your estate after 7 years
- Invest in Business Property Relief qualifying assets – AIM shares and some business investments are IHT-free after 2 years
- Leave 10%+ to charity – If you leave at least 10% of your net estate to charity, the IHT rate on the remaining estate drops from 40% to 36%
- Take out life insurance – A whole-of-life policy written in trust can provide funds to pay the IHT bill
- Give away assets early – The 7-year rule means early gifts escape IHT completely
- Use pension planning – Pensions typically fall outside your estate for IHT purposes
Always seek professional advice before implementing IHT planning strategies, as the rules are complex and mistakes can be costly.
8. Common Mistakes to Avoid
Many people make errors that increase their IHT liability. Watch out for:
- Assuming everything passes tax-free to a spouse – While transfers between spouses are exempt, this just defers the tax until the second death
- Forgetting about the 7-year rule – Gifts made within 7 years of death may still be taxable
- Not using both nil-rate bands – Failing to transfer a deceased spouse’s allowance can cost £130,000+ in extra tax
- Ignoring the residence nil-rate band – Not structuring wills to qualify for this can mean paying unnecessary tax
- Overlooking life insurance – Without proper planning, beneficiaries might need to sell assets to pay the IHT bill
- DIY probate for complex estates – Mistakes in valuation or calculations can lead to penalties
9. Recent Changes and Future Outlook
The IHT system has seen several important changes in recent years:
- The nil-rate band has been frozen at £325,000 since 2009 (originally planned to rise to £350,000)
- The residence nil-rate band was introduced in 2017 and reached £175,000 in 2020
- In 2021, HMRC introduced new reporting rules for estates that don’t owe tax but need to claim transferable allowances
- The 2023 Spring Budget confirmed the nil-rate bands would remain frozen until at least April 2028
With property prices rising faster than the frozen allowances, more families are being drawn into the IHT net. The Office for Budget Responsibility predicts IHT receipts will rise from £7.1 billion in 2022/23 to £8.4 billion by 2027/28 (source: OBR).
10. When to Seek Professional Advice
While this calculator provides a good estimate, you should consult a professional in these situations:
- The estate is valued at over £1 million
- There are complex assets like businesses, farms, or overseas property
- The deceased made substantial gifts in the 7 years before death
- There are disputes among beneficiaries
- The estate includes trusts or offshore assets
- You’re unsure about which reliefs apply
Professional advice typically costs between 1-2% of the estate value but can save significantly more in tax and prevent costly mistakes.