A) Complete an Affidavit of Support form and; b) Gather evidence of their finances and other supporting documents (See Step 5). 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.Completing and signing Form I-864 makes you the sponsor. An affidavit of support form must be submitted together with supporting documents which establishes the income source and income amount listed on the form. The Affidavit of Support is legally required for the petitioning sponsor for many familybased and some employment based immigrants. Some sponsors temporarily reside abroad and intend to move to the US once a family member's immigrant visa is issued. Relief in the form of. Temporary. Only submit this form if you are already in the United States on an F-1 or J-1 visa. Other types of bill will not accepted. National Visa application form, completely and clearly filled out, to be signed in the presence of a Consular officer.