Report and pay your Capital Gains Tax

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If you have other capital gains to report

If your capital gain is not from a UK residential property sold after 6 April 2020, you can report your gain:

  • in a Self Assessment tax return
  • using the ‘real time’ Capital Gains Tax service

Before you start, you’ll need to work out if you need to pay and how much you owe.

There’s a different way to report gains on UK residential property.

Report in a Self Assessment tax return

You can report your gains in a Self Assessment tax return in the tax year after you sold or disposed of an asset.

You can get help with your tax return from an accountant or tax adviser.

After you’ve submitted a return, HM Revenue and Customs (HMRC) will tell you how much you owe, how to pay and when to pay.

Report using the ‘real time’ Capital Gains Tax service

You can use the service to report gains on assets you sold during the tax year:

  • 2023 to 2024
  • 2024 to 2025

You must be a UK resident to use this service. You cannot use it to report on behalf of someone else, for example a client, trust or an estate.

You cannot use the service to report:

If you’re already registered for Self Assessment, you’ll also need to include details of the sale in your Self Assessment tax return.

Report your Capital Gains Tax now

Before you start

You need to sign in to report online. If you do not already have sign in details, you’ll be able to create them when you sign in for the first time.

Check what information you need before you report your gains.

You must attach a copy of your calculations when you report your gain.

How to pay

After you’ve reported your gains, HMRC will send you a letter or email giving you a payment reference number starting with ‘X’.

Use your payment reference when you pay:

You must report by 31 December in the tax year after you made your gain and pay by 31 January. For example, if you made a gain in the 2024 to 2025 tax year, you need to report it by 31 December 2025 and pay by 31 January 2026.

If you need to make a change

You’ll need to submit a new report using your report reference number starting with ‘RTT’. You’ll be sent this number by email after you first use the service.