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Self Assessment deadlines looming? Millions still yet to file

5.65 Million Still to File Their Self Assessment
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If you are one of the 5.65 million still left to file your Self Assessment tax return, the clock is ticking. With the January 31st deadline fast approaching, millions of UK taxpayers are suddenly realising they have less time than they thought to get everything in order and submitted. 

Feeling a bit behind? Don’t panic, you’re far from alone, and the good news is that it’s not too late to get expert help on your tax return.

How many people still need to file?

HMRC confirmed that nearly half of eligible taxpayers have yet to submit their Self Assessment tax return. That means millions of people are in the same boat, facing the January 31st deadline and the risk of penalties if they don’t act fast. 

If your return is still hanging over your head, these numbers show you’re in very good company. But leaving it too long could cost more than just peace of mind.

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Why filing your tax return on time matters

Missing the Self Assessment deadline can quickly become expensive. HMRC penalties escalate the longer your return is overdue:

  • £100 fixed penalty immediately after 31 January.
  • Daily penalties after three months.
  • Additional charges after six and twelve months.
  • Plus interest on any unpaid tax, calculated from the original due date. 

Even a small amount of unpaid tax can grow quickly once interest is added, so it’s always better to file and pay on time. 

And if you leave it to the last minute, rushing increases the risk of mistakes. Errors can lead to incorrect tax bills, missed allowances, or follow-up questions from HMRC. Not exactly the way to start the year.

Crunch can sort it for you, yes, even now.

If your Self Assessment is still staring at you from your to-do list, Crunch can help take it off your hands. Our ACCA certified accountants prepare and submit tax returns every day. They know all the forms, the traps, and the HMRC rules inside out, so you don’t have to.

Here’s what you get when Crunch handles your Self Assessment:

Even if you’ve left it late, starting now is far better than missing the deadline completely.

Don’t let procrastination cost you

Millions of people are yet to file, but penalties only kick in if you miss the deadline. So if you know you need to submit your Self Assessment tax return and you are running out of time, now is the moment to act.

With Crunch on your side, you can stop worrying about forms, deadlines, and HMRC reminders and start getting your tax return sorted properly. 

Speak to an accounting expert

If you're unsure what level of support you need, our friendly team are on hand to help you pick the right package for you.
Self Assessment tax returns done for you, for just £200+VAT
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Vicki Nichols
Marketing communications & content manager
Updated on
January 12, 2026

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