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The SA108 is a form that can be submitted alongside an SA100 if the individual needs to declare and pay capital gains on selling assets for profit.

More detail:

The SA108 is a type of tax form used in the United Kingdom for Self Assessment. It is a supplementary form used by individuals that are liable for Capital Gains tax on profit earned through selling assets for a profit.

It is a paper form and must be submitted alongside an SA100 by 31st October following the end of the tax year that the form relates to.

If an individuals submits a Self Assessment online, an SA108 is not required as the online form will include the ability to file the information there.

An example page of the SA108 from 2022/23 is shown below:

A photo of page 2 of a blank SA108 form from 2022/23

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