A Uk Tin Number is generally treated as Unique Taxpayer Reference (UTR). HMRC issues this number and it’s used to identify UK taxpayers. While there is no official term ‘TIN’ used in the UK, international forms and organisations may require it and UTR should be given. The National Insurance Number or VAT number might be relevant identifiers, however when it comes to income tax, the UTR is the most commonly used.

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