What do I need to provide to prove I am not a U.S. taxpayer even though I use a U.S. mailing address?

In certain cases, the IRS Form W-8 you submitted is insufficient to establish your status as a non-U.S. taxpayer. This often occurs when certain U.S. connections are found to be associated with your account (e.g., U.S. mailing or permanent address, U.S. telephone number, U.S. place of birth, citizenship or Green Card).  The presence of these U.S. connections requires us to collect additional documentation …

In most cases, you automatically acquired U.S. citizenship when you were born in the United States even if you have never applied for a passport. U.S. tax rules designate all U.S. citizens as U.S. taxpayers, even those that did not live in the U.S. or receive a U.S. passport. U.S. citizens are required to provide us with IRS Form W-9 and a valid taxpayer ID (e.g. Social Security Number). Nevertheless, we may accept IRS Form W-8 from you to establish your status as a non-U.S. taxpayer if you provide us with a copy of your Certificate of Loss of Nationality of the United States (Form DS-4083) and a copy of your unexpired passport evidencing citizenship in another country…

FATCA related FAQs involving U.S. Green Card Holders. See here for other FATCA related FAQ topics…

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Even if your Green Card has expired for immigration purposes (that is, you cannot use it to enter the United States), tax rules, generally, provide you remain a U.S. taxpayer until you formally renounce your U.S. Green Card. Generally, a U.S. Green Card holder cannot provide Form W-8BEN, and must provide Form W-9 instead…