EdwardUK

If I work back my tax return for 2021 to 22 and 2022 to 23 but I have registered for self assessment and tax return for 2023-24 earlier this year with UTR received, do I need to register the self assessment and tax return for 2021 to 22 and 2022 to 23? If not, I encounter a credential error when submitting my 2021 to 22 tax return though third party software (SelfTax), I have ensured my gateway ID, password and UTR correct many times but it did not come through. May I know what the possible cause is? Thank you.

Should I fill in the SA109 for Year 2022 instead of 2024? Will there be any fee/fine to be charged?

If I have not done the split year treatment for the financial year 2021-22. How can I tell HMRC now?

I moved to UK from Hong Kong in late August 2021. I am not sure if I need to fill in tax return for the items mentioned below. (1) Do I need to disclose what I have saved/earned from Mandatory Provident Fund (MPF) but I have never cashed out? (2) Do I need to disclose the interests what I have earned from the saving account of the banks in Hong Kong?; (3) Do I need to disclose the interests what I have earned from the shares in Hong Kong but I have never cahsed out? (4) Since I have not filled in any tax return for the previous financial years in UK, how could I work back my tax return, if needed? Thank you.