UK Capital Gains Tax Calculator
2024/25 CGT with the £3,000 annual exempt amount and unified 18/24% rates.
Inputs
How it works
Gain − £3,000 allowance = taxable gain. The part still fitting in the basic-rate band (up to £50,270) is taxed at 18%; the remainder at 24%. Rates unified for shares and residential property from Oct 2024.
Frequently asked questions
Are these amounts an exact tax bill?
No. They use verified 2026 IRS/SSA figures but ignore credits, phase-outs and AMT. Use tax software or a CPA to file.
Marginal vs effective rate?
Marginal is the rate on your next dollar. Effective is total tax ÷ taxable income — always lower because earlier brackets fill first.
Standard or itemized?
Take whichever is larger. 2026 standard deduction: Single $16,100 · MFJ $32,200 · HoH $24,150 · MFS $16,100.
How is state tax handled?
Eight states impose no income tax. The rest are approximated at their top rate — see your state's brackets for a precise figure.