Taxpayer Identification Number

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

Section 6109(a) of the Internal Revenue Code provides (in part) that "When required by regulations prescribed by the Secretary Any person required under the authority of this title to make a return, statement, or other document shall include in such return, statement or other document such indentifying number as may be prescribed for securing proper identification of such person."

Internal Revenue Code section 6109(d) provides: “The social security account number issued to an individual for purposes of section 205(c)(2)(A) of the Social Security Act shall, except as shall otherwise be specified under regulations of the Secretary, be used as the identifying number for such individual for purposes of this title .”

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)
  • an Adoption Taxpayer Identification Number, used as a temporary number for a child for whom the adopting parents cannot obtain an SSN
  • a Preparer Tax Identification Number, used by paid preparers of U.S. tax returns

SSNs are used by individuals who have the right to work in the United States.

ITINs are used by aliens who may or may not have the right to work in the US, such as aliens on temporary visas and non-resident aliens with US income. Often people need the identification number because they have been advised by a bank that no account will be opened without a number, even if the account is being opened by a non-profit organization.

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

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