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The SA101 is one of the supplementary forms that you can attach to the SA100 main Self Assessment tax return form if you need to declare less common types of income, deductions, and tax reliefs.
For example:
You can download the SA101 from HMRC’s website. Just like with the main SA100 form, you don’t need to file the SA101 if you file your tax return online.
Or see our Guides, Calculators or Taxopedia
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