Taxpayer identification number

Taxpayer identification number (TIN) means the identifying number required on tax returns and other documents submitted to the Internal Revenue Service; that is, an individual's social security number (SSN) or an employer identification number (EIN). A SSN is composed of nine digits separated by two hyphens, for example, 123-45-6789. An EIN is composed of nine digits separated by one hyphen, for example, 12-3456789. The hyphens are an essential part of the numbers.

Source

31 CFR § 363.6


Scoping language

None
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