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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.
TIN, or Tax Identification Number, is a nine digit number issued to companies for tax purposes, and this number represents the status of the company with the internal revenue services. This number is given to a company to make the issue of creating and taking care of the business at hand more effective and efficient.he basic difference between EIN and TIN, is that the Tax Identification Number is used for the tax purposes of the company, and when that same number is used to record the taxes of the employees, it is called EIN. 2.