I have been self employed for many years and as such have a unique tax reference number. This is used for my self assessment returns and also for VAT when we reached the threshold about eight years ago. On employing our first member of staff two years ago I received a different number which we use for our online reporting of PAYE. Today in the post a letter from HMRC arrived informing me that I would have to fill in a tax return and my unique tax reference was at the top of the letter, totally different number to the others, and that they would contact me after April with further details. Before tackling the dreaded 0300 number I wondered if anyone else has received a new reference number or is this a glitch?. Should I just wait until April and see what transpires?