“Remember that the deadline for filing your 2020-21 Self Assessment tax return online is 31 January 2022. Any balancing tax due for 2020/21 together with first payments on account for 2021/22 are due on the same date.
If you do not meet these deadlines, HMRC will automatically charge late filing penalties and interest. If you are unable to pay your tax liabilities on time it may be possible to agree a Time to Pay arrangement with HMRC.”