What Is a TIN Number?


Quick Answer

A TIN is a taxpayer identification number. It is assigned by the Internal Revenue Service or the Social Security Administration to identify American taxpayers and citizens. When issued from the SSA, the TIN is an SSN or a social security number.

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Full Answer

There are four more types of TINs. The EIN (Employer Identification Number) is used to identify businesses. ITIN (Individual Taxpayer Identification Number) is assigned to aliens and their dependents and spouses. ITIN is reserved for people who are unable to obtain a SSN. The ATIN is the Adoption Taxpayer Identification Number which is temporarily assigned to children being adopted for use on tax return forms. PTIN is the Preparer Tax Identification Number and is given to people who prepare tax returns. The PTIN is used by the preparer on their client's tax returns to identify the person as the preparer of the tax return.

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