| Country | Synonym | Format |
| Canada |
Social Insurance Number (SIN) First Nations Identify Number |
9 Digits |
| New Zealand | Inland Revenue Department Number (IRD) | 8-9 digits (excluding dashes) |
| United Kingdom |
National Insurance Number (NIN) Unique Taxpayer Reference (UTR) |
2 letters + 6 digits + 1 letter |
What is my Tax Identification Number (TIN)?
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