A Taxpayer Identification Number (TIN) is an identification number used by the Internal Revenue Service (IRS) in the administration of tax laws. It is issued either by the Social Security Administration (SSA) or by the IRS. A Social Security number (SSN) is issued by the SSA whereas all other TINs are issued by the IRS.

Taxpayer Identification Numbers

  • Social Security Number "SSN"
  • Employer Identification Number "EIN"
  • Individual Taxpayer Identification Number "ITIN"
  • Taxpayer Identification Number for Pending U.S. Adoptions "ATIN"
  • Preparer Taxpayer Identification Number "PTIN"
Note: The temporary IRS Numbers previously assigned are no longer valid.

Do I Need One?

A TIN must be furnished on returns, statements, and other tax related documents. For example a number must be furnished:

  • When filing your tax returns.
  • When claiming treaty benefits.

A TIN must be on a withholding certificate if the beneficial owner is claiming any of the following:

  • Tax treaty benefits (other than for income from marketable securities)
  • Exemption for effectively connected income
  • Exemption for certain annuities