... for those who file online by 28 February.Link to HMRC press release
Self Assessment customers who cannot file their tax return by the 31 January 2021 deadline will not receive a late filing penalty if they file online by 28 February.
Taxpayers are still obliged to pay their bill by 31 January. Interest will be charged from 1 February on any outstanding liabilities. Customers can pay online, or via their bank, or by post before they file.