CGT Calculator 2026/27: UK Capital Gains Tax

Enter your gains and income for the 2026/27 tax year (6 April 2026 to 5 April 2027) to estimate your Capital Gains Tax. Rates: 18% within your basic-rate band, 24% above it, after the £3,000 annual exempt amount.

Total gains this tax year (£) Allowable losses, including losses carried forward (£) Taxable income before gains, e.g. salary, rent, interest (£) Gross pension contributions and Gift Aid that extend your basic-rate band (£)

Estimated CGT£0

Taxable gain after £3,000 allowance: £0
Charged at 18%: £0
Charged at 24%: £0
Effective rate on total gains: 0%

How this is worked out

Losses are deducted from gains, then the £3,000 annual exempt amount.
Your gains sit on top of your taxable income. Whatever fits in your unused basic-rate band (£37,700 above your Personal Allowance) is taxed at 18%; the rest at 24%.
The £12,570 Personal Allowance is reduced by £1 for every £2 of income over £100,000.
Gross pension contributions paid from net pay, and Gift Aid donations, extend your basic-rate band.

This is an estimate for UK-resident individuals. It does not cover Business Asset Disposal Relief, Investors’ Relief, trusts or the 60-day reporting rule for UK property. Gains inside an ISA or pension are not taxed. Sources: GOV.UK: Capital Gains Tax rates, GOV.UK: rates and allowances. Not personal tax advice.