Under normal circumstances, HMRC would automatically send you a late filing penalty notice for £100 if your tax return is filed after 31 January 2021.
However, this year HMRC have bowed to the pressure and recognised that circumstances are far from normal and have agreed that the late filing penalty will not apply if you file online before 28 February 2021. Effectively, we have a further month to submit your return online for 2019-20.
But please note, even if you file before 28 February 2021, any tax payable for 2019-20 and on account for 2020-21 remains payable on 31 January 2021.
The press release covering the announcement can be seen at https://www.gov.uk/government/news/no-self-assessment-late-filing-penalty-for-those-who-file-online-by-28-february