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. An Affidavit of Support sponsor must be at least 18 years old and must be either a U.S. citizen or a lawful permanent resident.Forms ; Affidavit in Support - Surplus Money. PDF ; Confirm Report - Appoint Referee. It is also vital that the citizen fills out what is known as the Form I-134 Affidavit of Support. Child Support Forms ; 4-9a. 864 Affidavit of support How to fill out the Form 864 immigration Tips. If you are sent a Financial Disclosure Affidavit, you must provide detailed information about your income and expenses. In order to amend your marriage record you or your spouse, as applicable, must complete the attached form. Use the HHS Poverty Guidelines to complete Form I-864, Affidavit of Support Under Section 213A of the INA.