I have a H1B with income way above poverty line since June 2011. I got married in January 2012. My wife (also my sponsor and the green card holder), has never had any income in the US and she is currently a grad student in the US. She moved here in January 2012. She got her green card in ~2004 but kept applying for a re-entry permit till now.
I understand that I-864 has to be filled by my wife, On I-864, there is a question in Part 6 "My total income as reported on my Federal tax returns for the last 3 years". Should I be putting in my wife's income ($0) and mention that she has never filed taxes in the US (except joint taxes in 2012)? Or should this have my income here? We filed joint taxes in 2012 so should the income for 2012 be our joint income (from Form 1040) and the rest be 0?