Tax Return deadlines

31st October - Paper Tax Returns If you send a paper tax return, it must reach HMRC by midnight on 31 October. 31 January - Online Tax Returns Your online tax return must reach HMRC by midnight on 31 January. Penalties if you miss the deadlines If you miss the deadlines, the longer you delay, the more you'll have to pay. So it's important to send your tax return to HMRC on time. If you have not already taken action now is the time to gather together your information. Chase in any missing statements from banks and building societies to avoid delays in processing your returns. It makes sense to find out how much tax you have to pay in advance of the payment deadlines to allow time to set it aside.