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Taxpayer Identification Number (TIN): Overview What is a TIN? A Taxpayer Identification Number (TIN) is required by the federal government for reporting purposes. A TIN can be a Social Security Number (SSN) or an Individual Taxpayer Identification Number (ITIN). A valid TIN can have only 9 numbers.
A1: A Taxpayer Identification Number (TIN) is a nine-digit number, which is either an Employer Identification Number assigned by the Internal Revenue Service (IRS) or a Social Security number assigned by the Social Security Administration (SSA).