Social Security Number
For U.S. citizens and resident aliens, a valid Social Security Number (SSN) must be used. Persons who require a SSN must file form SS-5 with IRS to obtain a number. (Please
note that applicants over 18 years of age applying for a SSN for the first time must attend in person and provide appropriate identification.)
A child born abroad to a U.S. citizen qualifies for United States citizenship even if the child is a resident of a foreign country and if the other parent is not a U.S. citizen. A SSN is required for all
children born before December 1996.
Individual Taxpayer Identification Number (ITIN)
Persons not eligible for a Social Security Number (nonresident aliens and others not entitled to work in the United States) who file U.S.
returns should apply for an Individual Taxpayer Identification Number (ITIN) by filing form W-7. An application for an ITIN will not affect the individuals current or future immigration status in the United States.
Corporations and Other Entities
Corporations and other entities should apply for an Employer Identification Number (EIN) on form SS-4. In many cases an EIN is available over the telephone through the
Tele-TIN program at certain IRS offices.
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