In general, you are a U.S. citizen and U.S. taxpayer if you were born in the United States. Unlike many jurisdictions, the U.S. taxes its citizens regardless of where they live (or even if they have never lived in the United States). We cannot accept IRS Form W-8 from a U.S. citizen, and must receive a Form W-9 instead. If you are a former U.S. citizen who gave up your citizenship, please refer to I was born in the United States but I do not have a U.S. passport and am not a U.S. taxpayer. Why am I being asked for additional documentation? for the additional information and documentation you may need to provide to establish your status as a former U.S. citizen.
What do I do if I was born in the U.S. but am not a U.S. taxpayer and do not have a Certificate of Loss of Nationality?
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I have a U.S. Green Card but am not a U.S. taxpayer. What additional information or documentation do I need to provide to ensure you can accept my Form W-8BEN?
FATCA FAQs - Issues involving U.S. passport or other evidence of U.S. citizenship
I was born in the United States but I do not have a U.S. passport and am not a U.S. taxpayer. Why am I being asked for additional documentation?
What is the U.S. tax treatment for residents of Puerto Rico?