The Form W-9 is an official document of the U.S. Internal Revenue Service (IRS), and it is used by the tax agency to confirm a person’s name, address and Taxpayer Identification Number (TIN) for income-generating or income-loss purposes. A TIN is either your Social Security Number or your Employer Identification Number (EIN, which is also available from the IRS). An entity that is required to send out a Form 1099 (of which there are several types), must obtain your correct W-9 information to report any earnings or losses that will affect your taxable income.



