What is a TIN?
A TIN (Tax Identification Number) is a unique identifier assigned to individuals and businesses by their national tax authority. It's used to track tax records and obligations, and it's a standard piece of information requested during financial onboarding.
Why it has so many different names
A TIN isn't a single global number — every country issues its own version, often under a different name. A few common examples:
United States — Social Security Number (SSN), or an EIN/ITIN for businesses and non-residents
United Kingdom — National Insurance Number (NIN) or Unique Taxpayer Reference (UTR)
Germany — Steuerliche Identifikationsnummer (Steuer-ID)
France — Numéro fiscal de référence
Spain — NIF / NIE
These all serve the same purpose: a unique number that identifies you to your local tax authority.
Why do we ask for TIN? Click below 👇
How to find your TIN
Your TIN is typically printed on:
Your tax return or tax assessment letter
Your national ID card or social security card (in some countries)
Official correspondence from your country's tax authority
If you're unsure which number is your TIN, your country's tax authority website is the most reliable source — they publish the exact format and where to find it.
Country-specific formats
For the full list of TIN formats by country, please refer to the attached reference document: