Tax Identification Number

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A Tax Identification Number or TIN is an identifying number used for tax purposes in the United States. It may be assigned by the Social Security Administration or by the IRS (Internal Revenue Service.)

A TIN may be

a Social Security number (SSN)
an Individual Taxpayer Identification Number (ITIN)
an Employer Identification Number (EIN), also known as a FEIN (Federal Employer Identification Number.

SSNs are used by individuals, other than aliens who do not have the right to work in the US.

ITINs are used by aliens who do not have the right to work in the US.

EINs are used by employers, sole proprietors, corporations, partnerships, non-profit associations, trusts, estates of decedents, government agencies, certain individuals, and other business entities.