Hub Page View: Social Security Number & ITIN What the SSN and ITIN are and what you will need them for. U.S. Taxes All international students and scholars are required to file a U.S. (federal) tax return even if you do not have U.S. source income. F-1 Student Employment There are limited opportunities for F-1 students to work while studying, and permission must be requested. Read this page for more details. J-1 Student Employment J-1 on-campus employment is defined as employment that occurs on the premises of Yale University or for which you receive a Yale paycheck. Read this page for more details.