C.  Which Form to File

Nonresident aliens who are required to file an income tax return must use:

• Form 1040NR, U.S. Nonresident Alien Income Tax Return (PDF) or, 
• Form 1040NR-EZ, U.S. Income Tax Return for Certain Nonresident Aliens With No Dependents (PDF) if qualified. Refer to the Instructions for Form 1040NR-EZ to determine if you qualify.

http://www.irs.gov/Individuals/International-Taxpayers/Taxation-of-Nonresident-Aliens