If you have any questions for HMRC about self assessment then the helpline is temporarily closed until the middle of September 2023.
HMRC currently have a backlog of work and trained staff are currently diverted to reduce this workload.
Anyone who requires help are directed to the following online resources:-
Self assessment chat – This is an automated chatbot.
Self assessment help sheets – These are detailed information sheets dealing with technical tax issues.
HMRC community forums – These can be helpful if you can’t find an answer elsewhere.