United Kingdom · 2025/26
United Kingdom Capital gains tax calculator
Estimate the Capital Gains Tax (CGT) an individual pays on a gain in the UK for the 2025/26 tax year. CGT is charged on the profit when you dispose of an asset such as shares, after deducting the tax-free Annual Exempt Amount. The rate depends on how much of your basic-rate Income Tax band is still free, so your taxable income matters.
| Capital gain | £13,000.00 |
| Annual Exempt Amount | -£3,000.00 |
| Taxable gain | £10,000.00 |
| Basic-rate band remaining | 17700% |
| Gain taxed at 18% | 10000% |
| Gain taxed at 24% | 0% |
| Gain after tax | £11,200.00 |
How it works
- Take the gain after deducting allowable losses, then subtract the Annual Exempt Amount of £3,000. What remains is the taxable gain.
- Work out how much of the £37,700 basic-rate Income Tax band is unused once your taxable income (income after the Personal Allowance) is taken into account.
- The taxable gain that fits in the unused basic-rate band is taxed at 18%; any gain above that band is taxed at 24%.
- For 2025/26 these 18%/24% rates apply to both residential property and other chargeable assets. Business Asset Disposal Relief gains (14%) are not covered here.
Worked example
A £13,000 gain on shares with £20,000 of taxable income in 2025/26 leaves £10,000 taxable after the £3,000 Annual Exempt Amount. With £17,700 of the basic-rate band still free, all £10,000 is taxed at 18%, giving £1,800 of Capital Gains Tax.
Frequently asked questions
Why does my income affect the Capital Gains Tax rate?+
Gains stack on top of your taxable income. The slice of gain that fits inside your unused basic-rate Income Tax band (up to £37,700 of income) is taxed at 18%; anything above is taxed at 24%.
What income figure should I enter?+
Enter your taxable income, meaning income after the £12,570 Personal Allowance has been removed. If your taxable income is already £37,700 or more, none of the basic-rate band is left and the whole gain is taxed at 24%.
Is the £3,000 allowance per person or per couple?+
It is £3,000 per individual for 2025/26. Spouses and civil partners each have their own, and transfers between them are normally on a no gain, no loss basis. Most trustees get £1,500.
Does this cover residential property and Business Asset Disposal Relief?+
For 2025/26 residential property is taxed at the same 18%/24% as other assets, so this calculator covers it. It does not apply Business Asset Disposal Relief, which taxes qualifying business gains at 14% up to a £1,000,000 lifetime limit.
Sources
- Capital Gains Tax: what you pay it on, rates and allowances - Rates · GOV.UK
- Capital Gains Tax rates and allowances · HMRC / GOV.UK
- Capital Gains Tax - rates of tax (Autumn Budget 2024 changes) · HMRC / GOV.UK
Last updated: 2025-04-06 · Applies to 2025/26
This is an estimate for general guidance, not financial, tax, legal or medical advice. Figures can change and individual circumstances vary. Always confirm with the official sources listed before making decisions.
- Individuals only, 2025/26 tax year. Assumes the gain is already net of allowable losses and that you enter taxable income after the Personal Allowance.
- Excludes Business Asset Disposal Relief (14%), Investors’ Relief, and any interaction with dividend or savings allowances.
- Rates of 18% and 24% reflect disposals on or after 30 October 2024.
Reviewed by Vikas Dulgunde.