Tax return deadlines and penalties

If you send in a paper tax return, it must reach HMRC by midnight on 31 October. If you miss this deadline you should send your return online

If you send in your tax return online it must reach HMRC by midnight on 31 January. You’ll have to pay a £100 penalty if HMRC doesn’t receive your tax return on time. The later you send your return, the more penalties you’re likely to pay.