UK Capital Gains Tax Calculator
Calculate UK Capital Gains Tax for 2026/27 with the £3,000 allowance and 18% and 24% rates.
About the UK Capital Gains Tax Calculator
Enter the gain, any allowable losses, your taxable income for the year and whether Business Asset Disposal Relief applies. The calculator gives the Capital Gains Tax due at the 2026/27 rates.
From 6 April 2026 gains are taxed at 18% if they fall within your unused basic-rate band (£37,700 of taxable income) and 24% above, the same for residential property and other assets. The annual exempt amount is £3,000. Business Asset Disposal Relief rose to 18%. Carried interest is now taxed as income.
The formula
CGT = 18% × gain within the basic band + 24% × the rest
Worked example
A £30,000 gain with £30,000 of taxable income
- After the £3,000 allowance, £27,000 is taxable
- £7,700 fits in the basic band at 18%; £19,300 at 24%
- CGT: £1,386 + £4,632 = £6,018
Questions people ask
Do I pay CGT on my home?
Usually not, thanks to Private Residence Relief.
When must I report UK property gains?
Within 60 days of completion, with payment on account.