I have to have an NI Number to file taxes in the UK, I call NI phone in England when I told them I live in N Ireland they gave me a number in Belfast to call, I called to make an appointment, after answering a few questions I was told that I needed a letter from whom ever is requiring me to pay taxes in the UK before I can apply for a number. (I am retired and not looking for employment) I was told number was only for people with a job or looking for a job. I called HMRC and was told they did not give letters like this, I called tax department and was told the same thing, I emailed UK Gov help and was told they did not have access to details from HMRC, got on phone again to NI N Ireland was told the same thing again about getting a number, I guess if I lied and said I was looking for work I could get a number but my age would give me away on that one soooo any suggestions would be appreciated.