To be eligible for a marriage-based green card, the applicant must have a U.S. financial sponsor (usually the sponsoring spouse) who certifies in an Affidavit of Support (Form I-864) that their annual income is at least 125% of the Federal Poverty Guidelines (100% for military sponsors). The exact minimum income required depends on where the sponsor lives, the size of their household, and other factors. More info about marriage visa income requirements