What evidence do I need to prove that a person didn't have to file up his taxes because he wasn't working?

Your sponsor could explain in a statement to U.S.C.I.S. that he was not working during those two years, and supply any proof that he has supporting his statement. For example, a person who was a student would generally be able to supply a copy of the student body card, and transcript of schooling, or another could show that he was being claimed as a dependent on someone else's tax return.Due to the limitations of the Lawyers.com Forums, Alan Lee, Esq.'s (the "Firm") participation in responding to questions posted herein does not constitute legal advice, nor legal representation of the person or entity posting a question. No Attorney/Client relationship is or shall be construed to be created hereby. The information provided herein by the Firm is general, and requires that the poster obtain specific legal advice from an attorney. The poster shall not rely upon the information provided herein as legal advice nor as the basis for making any decisions of legal consequence.