Avoid a Halloween Nightmare
If you send in a paper tax return, it must reach HMRC by midnight on 31 October. If you miss this deadline, you’ll need to send your return online instead. If you don’t, you’ll have to pay a penalty.
You should send your return back in the envelope provided or send it to the Tax Office shown on the front page of the form. You won’t get a receipt if you send a paper tax return.
If you’ve downloaded the form, it may not show a Tax Office address. You’ll need to check your Self Assessment statement – or a letter from HMRC – to find the right address to send it to. Make sure that the form also shows your ten-digit taxpayer reference number before you send it.