Report and pay Capital Gains Tax

tiemadmin • 23 October 2025

If you have sold a UK residential property since 6 April 2020, it is important to be aware that the reporting and payment deadlines for Capital Gains Tax have changed. For property sales completed on or after 27 October 2021, any Capital Gains Tax that becomes payable must now be reported and paid within 60 days of completion. This applies where the property is not fully covered by the private residence exemption. For example, where the property was a rental property, a second home, or only partly used as your main residence. If the property was jointly owned, each owner must report their own share of the gain.

To calculate the gain, you will need information about the dates of purchase and sale, the original purchase price, legal fees and other costs, plus any significant improvement expenses. Estate agency and legal costs on sale will also be needed. The sooner you gather these details, the easier it is to meet the deadline.

For other types of capital gains, for example shares, investments, or commercial property sold by a UK resident, the reporting is usually carried out through your Self Assessment return for the tax year concerned. In some cases it is possible to report gains in real time, rather than waiting until the tax return is due, but this depends on the circumstances. 

If you use the “real time” Capital Gains Tax service, this is available for UK residents disposing of certain assets (not including UK residential property) in the current tax year. If this route is used, the reporting deadline is by 31 December after the end of the tax year of disposal, with payment due by 31 January.

If you think you may have sold or are planning to sell a property or other asset that could give rise to a taxable gain, please contact us as soon as possible. Early information means that we can ensure the calculations are correct and the reporting deadlines are met, which helps avoid unnecessary interest or penalties.

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