This calculator is kept on the site as a quick utility, but it is not the focus of IsMyTaxDigital. If you came here for MTD, the right starting point is the MTD eligibility checker.

Assets and crypto

UK Capital Gains Tax Calculator (2026-27)

Enter your other income and total gain to estimate Capital Gains Tax using the basic and higher rate bands.

Tax year: 2026-27 · Last reviewed: 30 April 2026 · Source: GOV.UK CGT rates

Your inputs

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Other taxable income before this gain

GBP

Salary, self-employment profit, rental income, and any other taxable income for the year. CGT rate depends on whether your gain falls in the basic or higher band.Total gain before allowance

GBP

Sale proceeds minus original cost and allowable expenses, before the £3,000 annual exempt amount. Gains inside an ISA are tax-free and should not be entered.

Your estimate

Capital Gains Tax estimate

Estimated CGT

£2,700

On a £18,000 gain

Of your total gain:

You keep85%

CGT15%

Taxable income before gain£19,430

Total gain£18,000

Annual exempt amount£3,000

Gain taxed at 18%£15,000

Gain taxed at 24%£0

Estimated CGT£2,700

This basic estimate does not handle losses, Business Asset Disposal Relief, carried interest, non-residence, or special property reporting rules. This calculator provides a broad estimate only and is not tax advice.

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