this is more of a tax law question. I would change the forum for you but I cannot from my cell phone . I would encourage your husband to get his passport through his local consulate. If you are working on obtaining him some sort of legal status you are going to need identification for him in any case. With an ITI N number you could file jointly
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If you are legally married, then you should file as married, either jointly or separately. Otherwise, his immigration case might get more complicated, as you will have to explain why you filed your taxes as single when you were actually married. It's more a matter of planning ahead and accumulating evidence that will help his immigration case.
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No, you are married.
J Charles Ferrari Eng & Nishimura 213.622.2255 The statement above is general in nature and does not constitute legal advice, as not all the facts are known. You should retain an attorney to review all the facts specific to your case in order to receive advise specific to your case. The statement above does not create an attorney/client relationship. Answers on Avvo can only be general ones, as specific answers would require knowledge of all the facts. As such, they may or may not apply to the question.