The deadline to file your 2020/21 self-assessment tax return is soon. Taxpayers that choose to file via a paper return had a deadline of 31 October 2021. If you file electronically, the filing deadline is 31 January 2022 however HMRC is waiving late filing and late payment penalties for one month giving self-assessment taxpayers extra time (if required) to complete their 2020 to 2021 tax return and pay an tax due.