How does FATCA affect how foreign banks treat me as a U.S. person?

FATCA requires foreign financial institutions to identify their U.S.-person account holders and report those accounts to the IRS, or face U.S. withholding penalties. In practice this is why your bank back home asks you to certify your U.S. status, often on a Form W-9 or a local equivalent, once they learn you have a U.S. address, phone number, or green card. Some foreign banks, finding U.S. compliance burdensome, restrict or even close accounts held by U.S. persons, particularly for investment products. So FATCA is not just a filing rule for you; it shapes what accounts you can keep abroad. Be honest on these certifications, since the bank is reporting to the IRS anyway, and expect that your U.S. status is now visible to your home-country institutions. Plan your account structure accordingly.