Capital Gains Tax Calculator (Shares)
Estimate the UK CGT due when you sell shares.
For 2025/26 the first £3,000 of gains is tax-free. Gains on shares above that are taxed at 18% for basic-rate taxpayers and 24% for higher/additional-rate taxpayers. Where a basic-rate taxpayer's gain pushes them into the higher band, part may be taxed at 24%. Gains inside an ISA or pension are exempt. Simplified estimate, not tax advice.
About this calculator
When you sell shares held outside an ISA or pension for a profit, Capital Gains Tax may be due on the gain above the annual exempt amount of £3,000 (2025/26). Since 30 October 2024, gains on shares are taxed at 18% for basic-rate taxpayers and 24% for higher and additional-rate taxpayers. This calculator applies the exemption and your band to estimate the tax and your net gain.
Gains within an ISA or pension are entirely exempt from CGT.
Frequently asked questions
What is the annual exempt amount?
For 2025/26 the first £3,000 of total capital gains is tax-free. It has dropped steeply from £12,300 in 2022/23.
Which rate applies to me?
It depends on your income tax band. Where a basic-rate taxpayer's gain pushes their total income and gains into the higher band, part of the gain can be taxed at 24%.
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These calculators are for general information and planning only. They use the assumptions you enter and do not constitute financial, tax, or investment advice. Tax figures are simplified estimates for the stated tax year. Returns are not guaranteed; verify figures independently before making decisions.