Why do you ask for US citizenship?
To comply with the United States' FATCA (Foreign Account Tax Compliance Act) requirements, we must be able to determine if an individual is a US citizen. If they are, we must also collect their US tax identification number (TIN).
US citizens abroad must have their accounts reported to the Inland Revenue Service (IRS), even if they are tax residents outside of the US.
You can see how to submit US citizenship status via API in our API reference linked here.
More in Additional onboarding information
All FAQ collections
- About Griffin · 9 answers
Learn more about Griffin, our regulatory status, and the types of customers we support.
- Verify · 19 answers
Learn more about Verify, our automated KYC/KYB onboarding solution for fintechs.
- Sandbox · 8 answers
Our sandbox is available to everyone, free forever, and can be used to trial our products and build test integrations.
- Bank accounts · 12 answers
Learn more about the different types of bank account we offer.
- Interest and commission · 16 answers
Learn more about how interest and commission work at Griffin, when you can expect to be paid, and how we manage rate changes.
- Billing · 5 answers
Find out more about our fees and charges, how to access your payment history, and more.
- Griffin app · 16 answers
Get help with setting up security features, managing your organization, and integrating with third parties.
- Payments · 11 answers
Find out what payment types we support, our payment limits, and Confirmation of Payee.
- Additional onboarding information · 6 answers
Learn about the additional data required before 01 February 2026