A UTR (Unique Taxpayer Reference) Number is a 10 digit number that is unique to either you or your company and you’ll be presented with one when you register for self-employment.At Futurelink Group we have a wealth of experience and knowledge in providing contractor solutions.hen you or your accountant submits your self-assessment tax return, if you don’t have a valid UTR Number attached to your submission it will fail. It is for these above reasons that we require all our clients to provide us with a UTR number, so make sure you keep yours safe.