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There are two kinds of SA103:
It’s not always as easy as it sounds:
Also, in case you’re wondering: “sole trader” is the same as “self-employed”.
You can get the “shorter” SA103S form from this HMRC page:
If you file a Self Assessment tax return every year, then HMRC might also send it to you.
In any case, make sure you first read the “Self-employment (notes)” pdf for that tax year – it’s on the same HMRC page.
It will explain what each line item on the form means, and how to fill it.
If you want the full version, download the SA103F form here instead.
You need to send it together with your SA100 form (the main tax return form) – you can’t file the SA103 by itself.
No, you need to send it by post.
The good news is that you can choose to do your entire Self Assessment online. Plus you can get another 3 months to do it since the deadline for sending the paper form is October 31st, but for online tax returns is 3 months later (end of January).
At TaxScouts we can file your tax return online for you instead – and for a flat £119, regardless of how many sources of income you have or what kind of self-employed you are.
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