以下是引用purpleleaf在2006-2-25 15:34:00的发言：
if you are under OPT entire year, than you are still under F1, so 1040 NR, and you still should have tax treaty benefit, since there is no time limit, IMHO
if you are under partial OPT and partial H1, depends on the days, of OPT, 1040NR for OPT >183 days.
you should be able to get your SS and Med tax back.
But if this is your sixth year, even though you are OPT (or regular F1), you need to file form 1040 or 1040EZ.