[Updated November 2025]: If you're self-employed in the UK and earn more than £1,000 after allowable deductions, you need to file a self-assessment tax return each year. It's not only the self-employed, though. If you are on a higher income* or receive untaxed income from things like property rental, tips, commission, savings, investments, dividends, or foreign income, you also have to submit a return. Partners in business partnerships and those who made a capital gain resulting in Capital Gains Tax (CGT) also need to submit a return.

If you do have to fill in a self-assessment tax return, getting all the tax return fields filled in properly and the figures right can sometimes be difficult. That's where professional help from companies like Taxfile is worth its weight in gold. But what information will your accountant or tax advisor need from you? In today's guide, we'll explain exactly what you'll need to supply.

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[Updated February 2025]: If you missed the 31 January deadline to submit your self-assessment tax return, you are now into the penalty stage. HMRC applies an automatic £100 penalty to those who are anywhere from 1 day to 3 months late. Further penalties are then added if you take even longer to comply. It's even worse if you haven't paid the tax owed to HMRC by 31 January because you'll then owe interest on that too.

Our Advice if You’re Late

If you are late submitting your tax return and/or paying the tax owed, our advice is to:

1. submit your tax return without delay;
2. pay as much tax as you can as soon as possible*.
   By doing both, you'll minimise the penalty and interest payable to HMRC.

* Payment of any historic tax for 2023/24 and prior years is best dealt with by the last day of February at the latest. Any amount that remains due for 2023/24 is considered late thereafter and will attract an automatic HMRC charge of 5%.

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