What is a Taxpayer Identification Number (TIN)?

Modified on Thu, 12 Oct 2023 at 04:17 AM

A United States Taxpayer ID Number (TIN) is issued by either the Internal Revenue Service (IRS) or the Social Security Administration (SSA). TINs are used to govern and administer US tax laws as well as perform other functions.

There are various types of Taxpayer ID Numbers (TINs), so a TIN in and of itself is not a number.

The Social Security Number (SSN) is the only TIN that is issued by the Social Security Administration. All other TINs are issued by the IRS.


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