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. 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.
- Open a bank acount