Affidavit of Support (AoS; I-864)

This form is absolutely essential to a complete application, and is filled out by the petitioner and, in some cases, joint sponsors. It is used to show that an intending immigrant has enough pre-existing financial support in the United States, so that he or she will not become a public charge. The sponsor(s) must agree to full responsibility for support of the intending immigrant. One AoS must be completed for each member of an applicant's family. It is used only in family-based and some employment-based cases.