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A W9 is used by persons required to file information returns with the IRS to get the payee's (or other person's) correct name and TIN. For individuals, the TIN is generally a social security number (SSN).
The W9 is just a document that you complete as a US person to give the potential payer of funds to you, your SSN, name , and address.
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Please advise if you need more information about the W9 filing