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The SA104 is a form that can be submitted alongside an SA100 if the individual needs to declare profit or losses obtained from a partnership.

More detail:

The SA104 is a type of tax form used in the United Kingdom for Self Assessment. It is a supplementary form used by individuals that need to declare profits or losses from a Partnership.

There are two versions of this form. The SA104S is used if the individual is only submitting partnership trading income, and interest or other financial receipts after tax was removed from banks or building societies. The SA104F can cover all forms of partnership income.

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 this is not done, all partners are jointly responsible and may all receive a penalty.

If an individuals submits a Self Assessment online, an SA104 is not required as the online form will include the ability to file the information there.

An example page of the SA104F from 2022/23 is shown below:

A photo of page 2 of a blank SA104F form from 2022/23

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