HMRC has had a change of heart and have announced today that Self Assessment customers will not receive a penalty for filing their 2019-20 tax return late, as long as they file online by 28 February 2021. HMRC are still encouraging customers who have not yet filed to do so by 31 January, if possible and for customers still to pay their Self Assessment tax bill by 31 January as interest will be charged from 1 February on any outstanding liabilities.
Please note that the deadline for submitting final income figures for tax credit purposes remains 31 January 2021.