A tax ID for people who must file U.S. taxes but are not eligible for a Social Security number.
An ITIN is issued by the IRS to individuals who have U.S. tax obligations but cannot get a Social Security number, such as certain dependents or nonresident filers. It is used only for tax processing and does not authorize work or confer immigration status. It allows filing returns and claiming certain benefits.
A nonresident spouse without an SSN may obtain an ITIN to be included on a joint U.S. tax return.