Letter received regarding self assessmentHello, 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?