I have submitted tax return by post before 31 Oct 2022.
I have also paid my tax according to HMRC's letter, and received payment receipt from HMRC on 11 Jan 2023.
But I have received letter for late penalty recently claiming that I did not submit tax return on time.
I do not have an online HMRC account as I don't have the postcode or insurance number.
Anyone could advise what is happening? Thank you.