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thanks for comment. 

After i e-file extension for myself, what to do about my wife's tax. does she have to apply for extension too? in that case we run into the same problem of not having SSN/ITIN. is it better to paper file extension for both of us as that way i can leave ITIN of my wife as 'to be applied'.

Sorry for repeat question. getting mixed opinions on this from others so getting clarification. Thank you again.