The requirement is that the "family unit" (USC and alien spouse = 2, in your case, assuming you have no children) be able to document a minimum annual gross income equal to or exceeding 125% of the figure established in the annual Poverty Tables. The 2012 Table for a family of two indicates a required gross income of $18,912 USD. Otherwise, a co-sponsor and joint signatory on the I-864 Affidavit of Support would be required for any immigrant visa processing with an eye toward obtaining lawful permanent resident status (LPR).
Answered on May 15th, 2012 at 4:05 PM