Letter received regarding self assessment

Hello, I registered for self assessment a few months ago after starting a small business as a sole trader ready for paying the tax I owe further down the line. I received a letter from HMRC saying after they've looked at my circumstances I need to file a self assessment for 2019/20 & 2020/21 My business didn't exist that year, nor did I have a UTR etc. The only thing I can think of is that I rightfully claimed tax back for wearing a company uniform to work and later down the line during the pandemic for working from home during the pandemic. I'm full time employed in a permanent role and my tax and NI is done through PAYE. I know this next bit is difficult to answer without fully knowing my circumstances but do I need to literally file self assessment for those years and provide the information requested, so the income from my job and nothing else because I did not have my small business in those years?

Hi,

You can check the Self Assessment criteria tool to check if you meet the criteria.

Check if you need to send a Self Assessment tax return

if after using the tool you are still unsure why we have requested a return please contact our Self Assessment team who will be able to advise why a return has been requested for these years.

Self Assessment: general enquiries

Thank you.