It is mentioned in your post we have to living together for 6 month at TIME OF INTERVIEW.
I take back what i said. Though the I-864 only mentions 6 months, it does not say explicitly if you should have lived together for 6 months at the time of the interview or at the time of filing the application. If you search online, you would find a few immigration sites which assume it applies at time of the interview and some sites assume it applies at the time of filing. The actual decision depends on the adjucating officer and they might or might not be satisfied with your eligibility criteria. In my case, I assumed the 6 month criteria applies at the time of filing when i filed my applications.
So, if I file right now with my income and at the time of interview (which will be after more than 6 months or so ) we will have joint return.
Joint return is not a main criteria for filling the I-864. It would be needed during your interview to prove joint responsibiliities. Main criteria for I-864 is sponsor needs to be over the 125% income requirement to qualify.
Can I do that or it is advisable to have sponser right now?
Advisable to get a joint sponsor. Dont take chances.
Do I have to send tax returns right now or we need to take at time of interview?
You should send all documents that serve as evidence of income with the I-864. If you miss out, you will get an RFE asking for them.
- Do i need to do medical right now and send 693 form ?
Yes. You would be sending your application package to the lock box and you would include your I-130, I-485, I-864, I-693 and supporting G-324A
Thanks for your information,
Yogesh