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Many taxpayers are unable to file their Self Assessment returns for the year ending 5 April 2020 online due to software specification issues from HMRC.

If your case is on the list you cannot file online and must complete a paper tax return. Don't forget that it needs an actual signature. 

Exclusion cases for 2019-20 and earlier years. see HMRC self-assessment technical specifications 2020 for individual taxpayers