What is Foreign Account Tax Compliance Act?

FATCA is a U.S. law that requires foreign financial institutions (FFIs) to report accounts held by U.S. taxpayers or face withholding on certain U.S.‑source payments. It brought onboarding declarations (W‑8/W‑9) new forms and formats, GIIN registration for FFIs, cross‑border data exchange, and reimagined compliance playbooks. Apps with a global user base cannot afford to overlook it.

On a day‑to‑day basis: Classify customers and entities, capture tax forms, validate indicia (citizenship, address, phone, POB), and reconcile against ongoing activity. If indicia suggest U.S. status, cure the gap or restrict features. Align onboarding records with local privacy laws and intergovernmental agreements (IGAs) ‑ data moves, but the law follows.

FATCA is not AML, but it runs through the same plumbing ‑ clean KYC/KYB data, robust audit trails, and monitoring to spot anomalies. Map requirements against a risk‑based AML compliance framework so that ownership, residency, and reporting all line up. Expand checks for complex entities and beneficial owners with sanctions & PEP screening to prevent restricted parties from being in scope before reporting season turns frantic.

Tax rules don’t care about your UX. Build once, document always.