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If you earn money from being self-employed then you might need to submit a Self Assessment tax return to tell HMRC about your income. In this article we explain who needs to submit a return, and what information you might need to include.

Do I need to complete a Self Assessment if I’m self-employed?

You’ll need to submit a Self Assessment tax return if you previously registered to do so unless you tell HMRC otherwise.

If you’re self-employed, for instance because you’re a sole trader or you freelance, you’ll normally need to register for Self Assessment and submit a tax return if your self-employed income is more than the £1,000 trading allowance in a tax year (which runs 6th April – 5th April).

You won’t need to sign up for Self Assessment if your self-employed income is less than the £1,000 trading allowance.
 

What about if I work for an employer at the same time?

You’ll still need to register for Self Assessment if your self-employed income is more than £1,000, even if you work for an employer as well as being self-employed (for example, because you have a side hustle that you work on in your spare time).

This is because your employer will only report on earnings relating to your employment with them, so it’s up to you to tell HMRC about any income you get from working for yourself. If you ask an accountant to submit your return for you, make sure you tell them about any employments as well as your self-employed activity!
 

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How does Self Assessment work for self-employed people?

People who work as an employee usually have their tax and National Insurance contributions taken care of by their employer. If you also earn money from self-employment, then it’s up to you to report your income and pay the right amount of tax and NI (although the NI you pay as a self-employed person is different to NI you pay through an employer).

Your Self Assessment tax return must show the details of all of the income you receive during the tax year, including anything you earn from an employer. That doesn’t mean you’ll need to pay tax on that money again!

HMRC use this information to work out your total earnings for the year in order to calculate what rate of tax you should pay on your self-employed income. Declaring all of your income for the year helps HMRC understand:

  • What you earned
  • How you earned it
  • What tax relief you might be entitled to (for instance, by claiming allowable expenses)
  • Any tax you’ve paid already so that you don’t end up paying it twice on the same money

Do self-employed people need to send a tax return if they make a loss?

Yes, you’ll need to submit a Self Assessment return every year once you register for self-employed tax, even if you make a loss or earn less than the trading allowance.

Failure to submit a tax return when HMRC are expecting one usually results in a penalty!

When should I sign up as self-employed?

The deadline for registering as a self-employed sole trader is 5th October following the end of the tax year in which you started trading.

For example

You became self-employed in August 2023, which falls into the 2023/24 tax year. You should register for Self Assessment by 5th October 2024 at the very latest.

Registering for Self Assessment doesn’t happen automatically, but you can sign-up online. HMRC also have a Self Assessment Helpline available on 0845 900 0444.

When should I submit my Self Assessment tax return?

The deadline for submitting your Self Assessment tax return depends on how you plan to submit.

  • By post: Submit your paper Self Assessment tax return form by 31st October
  • Online: The deadline for an online submission is 31st January following the end of the tax year it relates to
  • Online, and you want HMRC to collect what you owe through your tax code: 30th December

You don’t have to wait until the deadline to submit your tax return, and can file it as soon as the tax year is over. This gives you much more time to get it right, and more time to pay your tax bill!

 
Learn more about our online accounting services for businesses. Call 020 3355 4047 to chat to the team, and get an instant online quote.

About The Author

Elizabeth Hughes

A content writer specialising in business, finance, software, and beyond. I'm a wordsmith with a penchant for puns and making complex subjects accessible. Learn more about Elizabeth.

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