A Unique Taxpayer Reference (UTR) is made up of ten numbers, for example 1234567890. This can be found on documentation issued by HMRC's Self Assessment department e.g. a previous Tax Return (SA100), a 'Notice to complete a Tax Return' (SA316) or a Statement of Account. You will not find this number on a payslip or PAYE Notice of Coding
Children's names and dates of birth if under 20
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