Completing and signing Form I-864 makes you the sponsor. Use this form to show they have adequate means of financial support and are not likely to rely on the US government for financial support.The affidavit of support is required for certain immigrant applications for visas or adjustment of status filed on or after December 19, 1997. If your sponsor lives in the United States, your family member or friend needs to complete the U.S. Government Form I-134. Affidavit of Support. By signing the Affidavit, the Financial Sponsor agrees, and promises to provide support for the student. The visa petitioner is required to sign the Form I-864. The affidavit of support is required for all applications for immigrant visas or adjustment of status filed on or after December 19, 1997. Some sponsors temporarily reside abroad and intend to move to the US once a family member's immigrant visa is issued. In these cases, Maryland law says that you have to file a document called an "affidavit" along with your motion or response.