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Kristian Charles Williams

Kristian Charles Williams

May 10, 2023

What in the world is the SA103?

The SA103 is one of two forms which are used in addition to your main SA100 if you need to inform HMRC about any income from self-employment.

What is the SA103 form?

Unfortunately the SA103 is not the downloadable instructions for 'How to 3d print a fully-functional, Mattel Hoverboard.'

Sadly it's a form. Just a boring old form. One of many boring old HMRC forms.

The SA103 comprises of two forms, one of which will need completing to pay tax on any income from self-employment. 

TAXO'D TOP TIP - Another benefit of filing your SA100 form online is you will not need to fill out any SA103 forms. The SA103 is only applicable to those filing to HMRC, in paper format via the post.

These are:

Do I need to complete an SA103 form?

If you are self-employed you will need to complete an SA103 form. 

Am I self-employed?

You are classed as self-employed if you are earning an income but are not employed as an employee by an employer.

However, you are NOT classed as self-employed if you are using a limited company and employing yourself.

How do I complete the SA103 form?

  • All details of your self-employment should be declared on the SA103, including income, allowable expenses, and any losses. If you have multiple businesses, you will need to complete separate SA103 forms for each business. 

What to expect after I submit an SA103 form?

If you have submitted the postal form SA103 via the mail, you will receive a Statement of Account from HMRC showing how much tax you owe, the amount you have paid and any amount left to pay. 

Depending on your tax situation, often you’ll also need to submit additional forms:

If you need to fill out any of these additional forms just attach them to your SA100 form.

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TAXO'D is a salary tax calculator. You record as you go (on your phone or your computer) day by day, throughout the tax year. As the weeks unfold and you are actively recording your income and expenses. With TAXO'D personal tax app - you will see in real-time displays the tax and National Insurance that you owe.With TAXO'D tax return software know exactly what tax you owe and when you owe it. Simple.

TAXO'D mobile tax tool does away with the need for an accountant, saving you further money and time. If you are earning money independently and responsible for your own taxes then sign up today. And find out why TAXO'D is the best self assessment software for freelancers and contractors.

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Disclaimer: This is simply a guide and should not be treated as tax advice. Contact HMRC directly if you need tax advice.

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TAXO'D blog Author

Kristian Charles Williams

Head of Growth, Partnerships & Mugician

A freelance human and one that resides in creative industries. For the best part I have been an independent musician and a (not-so-independent) composer.

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TAXO'D.  Beautiful, simple, award-winning, end-to-end accounting solution for freelancers. Record as you go. Know what you owe. Tax return, done. TAXO'D.  Beautiful, simple, award-winning, end-to-end accounting solution for freelancers. Record as you go. Know what you owe. Tax return, done. TAXO'D.  Beautiful, simple, award-winning, end-to-end accounting solution for freelancers. Record as you go. Know what you owe. Tax return, done.
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