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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.
How do you know if you need to fill an SA103?
You’re self-employed (also called a “sole trader”) if:
- You’re working for yourself as a freelancer
- But not if you’re full-time employed (although you should check with your employer to make sure)
- And not if you’re a director of your own limited company (you’re technically an employee of your own business)
There are two versions of the SA103:
- SA103S (“the short version”): you can use this one if your income from self-employment was less than £85,000
- SA103F (“the full version”): if you earned more than £85,000 from self-employment
You can download the SA103 quickly and easily 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.
Frequently Asked Questions
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Can you help me to maintain my own accounting records?
Of course! We advise that you start a comprehensive spreadsheet to keep track of your taxable income and relevant expenses throughout the year in order to make your tax return more straightforward. This can be done on an Excel spreadsheet or Google sheet to keep things simple! Contact our team for more advice today!
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When do I need to file my SA100 Self Assessment tax return by?
If you are a self-employed contractor, remember to file your Self Assessment by 31st January the year after the tax year you’re paying for. For example, if you’re paying your 2023/2024 tax return, this should be paid by 31st January 2025. To learn more about the SA100 Self Assessment tax return, visit our dedicated SA100 glossary page.
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