Capital Gains Tax Calculator UK 2025/26: What You Owe on Shares and Funds

Enter what you sold for, what you paid, and your other income, and see the Capital Gains Tax due for 2025/26 on shares, funds and other assets. The part that catches people out: your gain is stacked on top of your income, so the same gain can be taxed partly at 18% and partly at 24% depending on how much of your basic rate band is already used up by your salary or pension.

This uses England, Wales and Northern Ireland figures for 2025/26: a 3,000 pound annual exempt amount, a 12,570 pound personal allowance and a higher rate threshold of 50,270 pounds, which leaves a 37,700 pound basic rate band. Capital Gains Tax on shares, funds and most other assets is 18% for gains that fall in your remaining basic rate band and 24% for gains above it. Residential property that is not your main home is taxed at the same 18% and 24% rates for 2025/26. Your gain sits on top of your income, so any basic rate band already used by your salary or pension is not available at the lower rate. Gains cannot use your personal allowance. Anything held inside a stocks and shares ISA or a pension is free of Capital Gains Tax and should not be entered here. Scottish taxpayers pay the same CGT rates and thresholds as the rest of the UK, even though their income tax bands differ.