21/10/2026
Quick reminder for anyone who still files their Self Assessment on paper.
Your 2025/26 paper return has to reach HMRC by Saturday 31 October 2026. That's 10 days away, and it needs to arrive by then, not just be in the post.
Miss it and the Β£100 late filing penalty applies straight away, even if you don't owe any tax.
If you file online, your deadline is 31 January 2027. But that's also the date your tax bill (and possibly your first payment on account for next year) is due, so knowing the number early really helps.
And for employers: the electronic PAYE and CIS payment for the month to 5 October is due tomorrow, Thursday 22 October.
π² Not sure which deadline applies to you? Send us a message and we'll tell you straight away.