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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.
Difference Between EIN and TIN. EIN and TIN are numbers issued to individuals by the tax authorities and hold great significance for them as these numbers become identities of people when filing tax returns. Taxpayer Identification Number or the TIN is a generic term that is used by the IRS, and there are different types of numbers issued to people depending upon their profession. EIN is one such number that is required by business owners that employ workers.