Reopen Self-assessment tax return

Hello, Sir. My friend has asked for my assistance in reopening his self-assessment records for the 2022/23 tax year. He informed HMRC that he had ceased self-assessment several years ago. I suggested that he should call HMRC, but unfortunately, the self-assessment helpline is currently closed. In this situation, I would like to confirm whether he can submit the self-assessment tax return to HMRC now using his previous Unique Taxpayer Reference (UTR) number? (He needs his 2022/23 self-assessment for applying for a mortgage ASAP.) Thank you!

Hi

He can register for Self-Assessment online and this would reopen the record. Please see Register for Self Assessment

Thank you