I received money from sources outside the U.S. Do I have to report it and/or pay tax on that money?

Nonresident Aliens are not required to report or pay tax on money that they received from sources outside the U.S. If you remain in the U.S. long enough to become a Resident Alien for Tax purposes, then income from ALL sources (both U.S. and foreign) must be reported on the U.S. tax return.