UK Capital Gains Tax Calculator 2026/27
Calculate UK Capital Gains Tax for 2026/27 on shares, crypto, second homes or business assets — £3,000 allowance, 18%/24% rates, losses, and Business Asset Disposal Relief at 18%.
Estimates only — not tax advice. Tax rules change and depend on your situation; check with the tax authority or a tax professional.
How to use
- 1Enter your gain (sale price minus purchase price and costs) and any losses.
- 2Enter your taxable income for the year.
- 3See the tax and when to report it.
How it's calculated
Taxable gain = gains − losses − £3,000 allowance. The part that fits in your unused basic rate band (£37,700 − taxable income) is taxed at 18%, the rest at 24%. Business Asset Disposal Relief: 18% flat.
Frequently asked questions
What are the CGT rates for 2026/27?
18% for basic-rate taxpayers and 24% for higher and additional-rate taxpayers, for all assets including residential property. Business Asset Disposal Relief rose to 18% from 6 April 2026.
When do I pay CGT on a property?
UK residential property gains must be reported and paid within 60 days of completion. Other gains go on your Self Assessment return by 31 January after the tax year.
Is my home exempt?
Usually yes — Private Residence Relief covers your main home for the time you lived in it.