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The SA101 is a form that can be submitted alongside an SA100 if the individual earns uncommon types of income or claims uncommon deductions and tax reliefs.

More detail:

The SA101 is a type of tax form used in the United Kingdom for Self Assessment. It is a supplementary form used by individuals that earn a less common type of income such as stock dividends. It also helps individuals that claim less common forms of deductions and tax reliefs.

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 SA101 is not required as the online form will include the ability to file the information there.

An example page of the SA101 from 2022/23 is shown below:

A photo of page 2 of a blank SA101 form from 2022/23

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