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
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Capital Gains Tax estimate
Estimated CGT
£2,700
On a £18,000 gain
Of your total gain:
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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What this calculator does
It gives a first-pass estimate of UK Capital Gains Tax by taking your gain before the annual exempt amount and testing the taxable part against the basic and higher rate bands. It is useful when you want to sense-check a potential sale before doing a full tax return calculation.
How taxable gains are usually worked out
A gain normally starts with sale proceeds, then subtracts the original cost and allowable buying, selling, or improvement costs. The annual exempt amount can reduce the taxable gain. This calculator assumes you have already worked out the total gain before that allowance and entered it as one figure.
Why asset type and income matter
CGT rates can depend on what you sold and where your taxable income sits for the year. Shares and crypto are not always taxed at the same rates as residential property. Your salary, trading profit, rental income, or pension can also affect how much of the gain falls in the basic rate band before higher rates apply.
Common examples
People often use a CGT estimate for shares sold outside an ISA, crypto disposals, a second home, a buy-to-let property, or business assets. Each can have extra rules, so the calculator is best used after you have checked the asset type and gathered the purchase, sale, and cost figures.
What this calculator does not cover
It does not handle private residence relief, business asset disposal relief, losses brought forward, bed-and-breakfasting rules, share pooling, non-resident property returns, trusts, or overseas tax. Check HMRC guidance before reporting a disposal, especially for property or crypto. If you also have sole-trader or property income, use the MTD checker separately because CGT is not the same as qualifying income for Making Tax Digital.