SA100

The SA100 form is the main Self Assessment form you need to file to do your tax return, if you choose to file it by post.

Usually, depending on why you need to file a tax return, you need to attach another form to it (for example, if you’re self-employed, you also need to fill in and send a SA103 besides the SA100).

You can find the SA100 on HMRC’s website, where you can download it, print it, fill it, and submit it by post. You have until the 31st October following the end of the relevant tax year  to do this.

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