The form is asking for my wife's SS number but we both live in Japan. What should I do?

[ddemo · Accepted solution]

 Does she have an ITIN?   When I was in Japan and married but my wife didn't have an ITIN or SSN I did "married file separate" and hand wrote Non Resident Alien in replace of the "Social Security number."  

You can't efile, had to mail in the return.  

https://www.irs.gov/individuals/international-taxpayers/u-s-citizens-and-resident-aliens-abroad-nonr...

Hope that helps, if not I think a professional will answer.