当年我LG一个人在美国,H&R BLOCK/州的税务衙门/公司的秘书都跟他说他只能报SINGLE.他直接去问IRS,得到可以报Married filling jointly, 这是因为"Nonresident alien or dual-status alien. A joint return generally cannot be filed if either spouse is a nonresident alien at any time during the tax year. However, if one spouse was a nonresident alien or dual-status alien who was married to a U.S. citizen or resident alien at the end of the year, the spouses can choose to file a joint return. If you do file a joint return, you and your spouse are both treated as U.S. residents for the entire tax year. See chapter 1 of Publication 519. 见LINK.我当时不在美国,ITIN是在领事馆申请的.之后多年,我都没有去美国,但我LG每年都是用married filling jointly报税,我们也得到过这方面的退税.所以我认为联合报税肯定合法,但是是否划算要因人而宜.因为:1.联合报税时,一方如果没有SSN#,是不能得到政府一次性的退税.(比如去年一个家庭好像可以退1200刀,我们就没有拿到);2.另一方的国外收入理论上也要上报.