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UK capital gains calculator
CGT with the annual exempt amount by asset type.
About this calculator
What it estimates
UK Capital Gains Tax on a gain after the annual exempt amount, at the rate set by your income band.
Assumptions (UK 2025/26 tax year rates)
- •£3,000 annual exempt amount
- •18% within the basic-rate band, 24% above
- •Residential property and other assets shown at the same rates for simplicity
Estimates only, for orientation. Rates and thresholds change each tax year and your actual liability depends on facts this tool does not ask for. This is not tax advice.
For US–UK filers
Why your real number differs
A US person pays US tax on the same gain under different rules — a different cost basis in dollars, different holding-period tests and a different exemption for a main home — and then claims the UK tax as a credit.