credit card bills?
Talk to an attorney to get more suggestions.
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.
You're concerned with proving you've spent at least 2 1/2 years in the US and haven't been out of the US for more than 6 months at a time? Is that it?
Your passport stamps should show that you haven't left the US extensively if that's the case. As for the tax issue, the USCIS officer will likely ask you how you support yourself. Be prepared to answer that. You might want to get an attorney to help.
You could also obtain affidavits from people you know. And even if you don't have to have to pay taxes you can file tax returns showing you gave worked.
Maria J. Marty Attorney at Law | firstname.lastname@example.org | Office: 206.494.9999 McAuliff Law Firm | 14205 SE 36th St., Suite 100 | Bellevue, WA 98006 www.mcauliffimmigration.com Skype ID: mjmarty-mcauliff This is general information and not legal advice. For a more complete assessment of your situation, please contact our office. Our practice is limited to U.S. Immigration Law. We represent Organizations, International Investors, Professionals and Families.