What are the tax filing requirements for an Alien Departing the US?
Per the IRS, "before leaving the United States, all aliens (with certain exceptions) must obtain a certificate of compliance. This document, also popularly known as the sailing permit or departure permit, must be secured from the IRS before leaving the U.S. You will receive a sailing or departure permit after filing a Form 1040-C or Form 2063.
Even if the Alien has departed the United States and filed a Form 1040-C, U.S. Departing Alien Income Tax Return, on departure, that Alien must still file an annual U.S. income tax return.
If the Alien is married, then both the alien and his or her spouse are required to file, each of them must file a separate return, unless one of the spouses is a U.S. citizen or a resident alien, in which case the departing alien could file a joint return with his or her spouse.