What was the last self assessment tax year?
Sarah Duran
Published Apr 04, 2026
HM Revenue and Customs ( HMRC ) must receive your tax return and any money you owe by the deadline. The last tax year started on 6 April 2020 and ended on 5 April 2021. There’s usually a second payment deadline of 31 July if you make advance payments towards your bill (known as ‘payments on account’).
How long should taxpayers keep their tax records?
three years
The IRS recommends keeping returns and other tax documents for three years (or two years from when you paid the tax, whichever is later.) The IRS has a statute of limitations on conducting audits and it is limited to three years.
When is the deadline to file self assessment?
For the last tax year, the deadline for registering for Self Assessment if you are self-employed or a sole trader was 5 October 2019. The deadline for filing paper tax returns was midnight on 31 October 2019. The online deadline is midnight on 31 January 2020.
When is last chance to register for self assessment tax?
As more and more people are drawn into self assessment, either due to their earnings, gig working or changes to child benefits, it is essential to register for an online account on the HMRC website by the 5 October deadline in order to file an online self assessment tax return in January.
Can you file a self assessment tax return online?
HMRC expects you to file online and, within a few years, it’s likely to be the only way you can complete a Self Assessment tax return. So, if you’re starting out in business, you may as well get used to it. If you have not completed a tax return online before, you will need to register for an HMRC online account.
When is the last day to do self assessment?
Last year, 700,000 taxpayers missed the self assessment deadline and faced penalties of up to £100 a day if they missed the online self assessment filing date of 31 January 2020. Individuals need to complete a self assessment tax return for 2018/19 if: