Question: what taxes do nonresident aliens pay?
Answer: This income is taxed at a flat 30% rate, unless a tax treaty specifies a lower rate. Nonresident aliens must file and pay any tax due using Form 1040NR, U.S. Nonresident Alien Income Tax Return or Form 1040NR-EZ, U.S. Income Tax Return for Certain Nonresident Aliens with No Dependents.