Capital Gains Tax Calculator

For the 2026/27 tax year, the standard Capital Gains Tax rate is 10% for basic rate taxpayers and 20% for higher or additional rate taxpayers on most assets. However, these rates increase to 18% and 24% respectively for residential property gains that are not your main home. These rates apply to gains exceeding your annual tax-free allowance of £3,000 as confirmed by HMRC.

The annual exempt amount for Capital Gains Tax has been reduced to £3,000 for the 2026/27 tax year, down from previous years. This means you only pay tax on the total of your chargeable gains that exceed this £3,000 threshold. You can find the official figures and rules on the GOV.UK website under Capital Gains Tax.

Yes, you can carry forward capital losses from previous years to offset against gains made in the 2026/27 tax year. These losses must be reported to HMRC within four years of the end of the tax year in which they occurred to be valid. Once reported, they can reduce your taxable gains below the £3,000 annual exempt amount for the current year.

Gains made from selling shares held within a Stocks and Shares ISA remain completely tax-free in the 2026/27 tax year. You do not need to declare these gains on your Self Assessment tax return as they are exempt from Capital Gains Tax. This tax-free status applies regardless of whether you are a basic or higher rate taxpayer.

If you sell a UK residential property that is not your main home, you must report the gain and pay any tax due within 60 days of the completion date using the UK Property Disposal Service. This rule applies to all disposals occurring after 27 October 2021 and continues for the 2026/27 tax year. Failure to report within this timeframe may result in penalties from HMRC.