It is your current income that counts. So, if you can present a letter from your employer stating how much you are making, it would suffice. The tax returns need to be submitted as well. If you do not have enough income, find a joint sponsor, because it is your individual income that counts anyway. I suggest you hire a lawyer to help you.
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There is a fantastic immigration lawyer in Olympia (Lisa Seifert) who you should consider meeting with ... she can help you make a 'good' plan of how to proceed.
PROFESSOR OF IMMIGRATION LAW for over 10 years -- This blog posting is offered for informational purposes only. It does not constitute an attorney-client relationship. Also, keep in mind that this is an INTERNET BLOG. You should not rely on anything you read here to make decisions which impact on your life. Meet with an attorney, via Skype, or in person, to obtain competent personal and professional guidance.
If you want to show that he is compliant with the tax laws to improve the GC application, you can probably file a joint return. But, the bottom line here is that you need to go see a local Immigration Attorney and one of the posters indicated a good person to contact. Don't try to do this on your own, its too important, and the laws and procedures are not your area of specialty. Get some help.