12/10/2026
Paper Self Assessment returns for 2025/26 have to reach HMRC by 31 October. Here is the part almost nobody knows. 💡
If you meant to file on paper and the 31st goes past, you can still avoid a late filing penalty by filing online instead, as long as that is done by 31 January.
But if you post a paper return after 31 October, that penalty is yours. Filing again online before January will not undo it.
So if the paper deadline is going to beat you, the answer is not to post it anyway. The answer is to go online. 📌
Not sure which route you are on? Ring 01270 260600.
https://www.minshallandco.co.uk/services/self-assessment/