The deadline for paper returns is 31st October after the end of the tax year. After this date, returns are subject to late filing penalty rules. There are two exceptions:
1. Certain people are 'excepted' from this deadline and will be notified by HMRC. Their deadline is 31st January after the end of the tax year.
2. Certain items cannot be accepted by HMRC's online systems. The TaxCalc program can advise you on this; on these occasions the deadline will again be 31st January after the end of the tax year.
The deadline for online returns is 31st January after the end of the tax year.
By completing your tax return online, you can tailor it to your needs and only complete the pages you need. Selftax will give you full online support as you work through it and your tax will be calculated automatically. You also have longer to file your tax returns – instead of 31 October, you have until 31 January. To file your tax return online, you must register with HMRC.
You will need your Unique Tax Reference (UTR), which is 10 digits long and printed on all correspondence from HMRC, as well as either your postcode or your national insurance (NI) number. With these, simply go to www.hmrc.gov.uk, under ‘Do it online’ on the left, click ‘Register (new users)’, click 'individuals & employees', and finally click 'self assessment' on the left under 'do it online'.