[Updated 1 February 2026]: 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. Here's our professional advice of what to do if you're late...

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Taxfile prepared and submitted more than 400 Self-Assessment tax returns for clients during January. That's about a hundred a week and goes to show just how busy it gets for us during January, the busiest month in our accounting calendar.

Did you submit your tax return on time?

The deadline for submission of your tax return (and payment of any tax due) was 31st January at midnight. Did you manage to submit yours in time? If not, you're already into the 'penalty' period where HMRC basically fine you for being late. The penalty comes in the form of an initial £100 fine but that increases, potentially very significantly, as you get later and later with your tax return submission. If you look at the table below, it's safe to say that you can end up owing a thousand pounds or more if you bury your head in the sand and are 3 months late, or more. If you continue to leave your tax payment and tax return submission outstanding for six months or more, the penalty is £1300 as a minimum - perhaps more (it depends upon how much tax you owe).

Is your tax return & tax payment late? Taxfile can help!

If you are late submitting your tax return or paying tax and don't know how to straighten things out, don't

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