ITIN (Individual Taxpayer Identification Number)
An Individual Taxpayer Identification Number (ITIN) is a tax processing number issued by the Internal Revenue Service. The IRS issues ITINs to individuals who are required to have a U.S. taxpayer identification number but who do not have, and are not eligible to obtain, a Social Security number (SSN) from the Social Security Administration (SSA).
Form W-7
You can file Form W-7, Application for IRS Individual Taxpayer Identification Number (ITIN), with your federal income tax return. You must also include original documentation or certified copies from the issuing agency to prove identity and foreign status. If you qualify for an exception, then file Form W-7 with your proof of identity and foreign status documents and supporting documentation for the exception.