-See:
http://www.uscis.gov/portal/site/uscis/menuitem.eb1d4c2a3e5b9ac89243c6a7543f6d1a/?vgnextoid=3f443a4107083210VgnVCM100000082ca60aRCRD&vgnextchannel=3f443a4107083210VgnVCM100000082ca60aRCRD
如果前半年是J1(并且在前36个月免税期内),后半年变成AOS然后变绿卡,前半年的收入是否可以用treaty来免税呢?
-Yes, but you need to file I-1040, not 1040NR. See:
http://www.irs.gov/businesses/small/international/article/0,,id=96433,00.html