Gains on sale of shares

Posted on 16th July 2024 by Streets Capital Gains Tax


Image to represent Gains on sale of shares

Capital Gains Tax (CGT) is normally charged at a simple flat rate of 20% (but see comments below) when you sell shares unless they are in a CGT free investment such as an ISA or qualifying pension. Your gain is usually the difference between what you paid for your shares and the amount received when you sold them.

There are special rules for working out the cost of your shares if you sell:

  • shares you bought at different times and prices in one company;
  • shares through an investment club;
  • shares after a company merger or takeover; and
  • employee share scheme shares.

If you only pay basic rate tax and make a small capital gain, they you may only be subject to a reduced CGT rate of 10%. Once the total of your taxable income and gains exceeds the higher rate threshold, the excess will be subject to 20% CGT. There is also an annual CGT exemption. In the current (2024-25) tax year you can make £3,000 of gains before paying any CGT. The limit in 2023-24 was £6,000. The allowance applies to each member of a married couple or civil partnership. 

The usual due date for paying any CGT you owe to HMRC on the sale of shares is the 31 January following the end of the tax year in which a capital gain was made. This means that CGT for any gains crystalised before 6 April 2025 will be due for payment on or before 31 January 2026.

The normal way to report a gain on the sale of shares is to complete the relevant sections of your Self-Assessment tax return in the tax year after the gain was made. When calculating your gain, you can deduct certain costs of buying or selling shares such as stockbrokers’ fees or Stamp Duty Reserve Tax when you bought the shares.


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The content produced and presented by Streets is for general guidance and informational purposes only. It should not be construed as legal, tax, investment, financial or other advice. Furthermore, it should not be considered a recommendation or an offer to sell, or a solicitation of any offer to buy any securities or other form of financial asset. The information provided by Streets is of a general nature and is not specific for any individual or entity. Appropriate and tailored advice or independent research should be obtained before making any such decisions. Streets does not accept any liability for any loss or damage which is incurred from you acting or not acting as a result of obtaining Streets' visual or audible content.

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