Form W-9
Definition Use Form W-9 to provide your correct TIN to the person who is required to file an information return with the IRS. An individual or entity (Form W-9 requester) who is required to file an information return with the IRS must obtain their correct taxpayer identification number (TIN) which may be their social security number (SSN), individual taxpayer identification number (ITIN), adoption taxpayer identification number (ATIN), or employer identification number (EIN), to report on an information return the amount paid to them or other amount