A W8 Form, also known as a "Certificate of Foreign Status," is an essential tax document used in the United States for individuals who are not U.S. citizens or residents but have income from U.S. sources. The primary purpose of the W8 Form is to establish the foreign status of the individual or entity, allowing them to claim tax treaty benefits, reduce or eliminate withholding taxes, or report income earned in the U.S. to the Internal Revenue Service (IRS).

Signing this document is a good practice to notify the IRS in the US on your behalf and for your company the relationship that exists from a tax standpoint.