Don’t risk HMRC fines.
The SA103 is a form that you need to attach to your SA100 main Self Assessment form if you need to pay tax on income from self-employment.
You’re self-employed (also called a “sole trader”) if:
You can download the SA103 on HMRC’s website. Similar to the main SA100 form, you only need to print it and mail it if you don’t do your file return online.
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