UK Capital Gains Tax Calculator
Calculate your UK Capital Gains Tax for the 2025/26 or 2024/25 tax year. Enter your gain, other income, and asset type to see your CGT, effective rate, and a full breakdown including BADR and Investors' Relief.
Used to calculate your remaining basic rate band
Annual Exempt Amount
£3,000
Taxable Gain
£17,000
Capital Gains Tax
£1,700
Effective Rate
8.50%
on total gain
Basic Rate Gain
£17,000
Higher Rate Gain
£0
| Component | Rate | Gain | Tax |
|---|---|---|---|
| Annual Exempt Amount | 0% | £3,000 | £0 |
| Basic Rate | 10% | £17,000 | £1,700 |
| Total | £17,000 | £1,700 | |
Frequently Asked Questions
How is UK Capital Gains Tax calculated?
UK CGT is calculated by first subtracting the Annual Exempt Amount (£3,000 for 2025/26) from your total gain. The remaining taxable gain is split between the basic and higher rate depending on how much of the income tax basic rate band (£37,700) is unused by your other income. For other assets the rates are 10% (basic) and 20% (higher); for UK residential property the rates are 18% and 24%.
What is Business Asset Disposal Relief (BADR)?
Business Asset Disposal Relief (formerly Entrepreneurs' Relief) taxes qualifying gains from the disposal of business assets at a flat 10% rate. There is a lifetime limit of £1 million of qualifying gains. BADR typically applies to sole traders, business partners, and directors or employees disposing of shares in their own company, subject to ownership and activity tests.
What is the Annual Exempt Amount for CGT?
The Annual Exempt Amount (AEA) is a tax-free allowance for capital gains. For 2025/26 and 2024/25 it is £3,000 per individual. Gains up to this amount are not subject to CGT. The AEA cannot be carried forward — it is a use-it-or-lose-it allowance for each tax year.