So I was working for a company as an employee in the UK under my student visa from August 2020 to February 2021. The company couldn't get me a Tier 2 visa so I ended the work and now I'm going back to the US since my visa is ending.
I received a letter from HM Revenue Customs asking me for info (PAYE/Self assessment). They are asking for name, dob, Employer PAYE reference, etc which I have, but also asking me for a National Insurance Number which I don't have (yet?). They say to fill out a different form to get a number.
I assume I should do this (get a National Insurance Number) and return the info, correct? The only reason I was questioning this is that I'm leaving for the US soon. Now I may be back in the future and of course, I don't want to spoil a UK opportunity in the future. I assume that I might get taxes back or have to pay extra?
Thanks!