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 by submitting a ticket via Client Portal.
Alternatively, you may provide us with a written explanation of why you are not a U.S. citizen (for instance, you were born in the United States to parents who were fully-accredited foreign diplomats). We may request further information from you depending on the explanation provided.