There are ongoing problems with HMRC’s self assessment tax calculator.
HMRC is working to resolve these but the exclusion list is still being updated. This is to reflect fixes made, new issues resulting from those fixes and updated guidance.
Where a return can’t be filed for one of the reasons listed and providing that a paper return is filed before 31 January HMRC accepts that the taxpayer had a reasonable excuse for filing a paper return after the 31 October deadline.
The exclusions include:
Scottish taxpayer issues
dividend income issues
income from property and transfer of some of their PA.