UKCapitalGainsTaxCalculator.co.uk is a free, independent tool for UK taxpayers to estimate capital gains tax on shares, investment property and other assets for 2026/27.
Use the CGT calculator to estimate your tax liability on a disposal. Enter sale proceeds, original cost, allowable costs, losses and your taxable income before the gain to see the CGT at 18% or 24%, split across basic and higher-rate bands.
All calculations use published 2026/27 rates including the £3,000 annual exempt amount and the post-October 2024 CGT rates of 18% and 24%.
All content is reviewed against current HMRC and GOV.UK guidance. We prioritise factual accuracy and practical usefulness. Where assumptions are made, they are documented on the methodology page.
This site does not provide financial, tax or legal advice. For decisions about capital gains, consult a qualified tax adviser or accountant.
For corrections, data-quality feedback or editorial queries: mskippergriffiths@gmail.com
Part of the UK Money Calculators network. Tax year: 2026/27.