First off, what is a UTR?
A UTR (Unique Taxpayer Reference’ is a unique 10 digit reference that helps the HMRC identify you and is required in situations such as when filing a tax return.
UTR’s are only issued by HMRC when you have registered for self-assessment. The unique 10 digit code can be found on documentations issued by HMRC, such as Tax return’s, a notice to complete a tax return or a statement of account.
This number is usually on the top of the document, and will be labeled with one of the following, UTR, Tax reference and Official use.