Where can I find my TIN or NIN?

It depends on your country:

• UK: Your National Insurance Number (NIN)
  • on a document you already have, for example a P60, payslip or letters about benefits
  • in your personal tax account if you already have one
  • in the HMRC app if you live in the UK
  • in your Apple or Google Wallet if you’ve previously saved it there

Source: Find your National Insurance number

• Other countries:
  • National ID number, which is equal to the TIN, tax number, or personal code
  • In Denmark, for example, you CPR number can be used for this
  • The TIN format varies by country. It depends on your local tax system. You can check the exact structure and document rules for over 100 countries in the OECD TIN Directory.