UK Capital Gains Tax Calculator
Estimate the tax on a gain from shares, a second home or other assets, with the yearly exempt amount.
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How to do it
- 1Fill in the boxes
Type your numbers or pick the options you need.
- 2See the result
The answer updates right away as you change a value.
- 3Use it
Copy the result or note it down. Nothing is sent anywhere.
About this tool
Enter your other taxable income and the gain. The calculator removes the £3,000 annual exempt amount, then taxes the rest at 18 percent inside your basic-rate band and 24 percent above it. Rates and thresholds are for the 2026-27 tax year and can change. A guide only, check gov.uk for the official figures.
How it works
Capital gains tax applies to the profit when you sell an asset such as shares or a buy-to-let. Your gain is added on top of your other income to see how much falls in the basic-rate band. Losses from the same year reduce the gain.
Example
With £50,000 income and a £20,000 gain, £17,000 is taxable. About £7,700 is at 18 percent and the rest at 24 percent.
Not covered
Your main home is normally exempt, and gains inside an ISA or pension are tax free. Business asset disposal relief and gifts between spouses are special cases that are not modelled here.
Frequently asked questions
What is the annual exempt amount?
£3,000 of gains a person can make each tax year without paying CGT.
What are the CGT rates?
18 percent for basic-rate taxpayers and 24 percent for higher and additional rate taxpayers, on shares and property alike.
When do I report a gain?
Property gains must be reported within 60 days of completion. Other gains are reported on the Self Assessment return.
Can I use losses?
Yes. Enter losses made in the same year to reduce the gain. Earlier losses must have been reported to HMRC.