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.Individuals immigrating through most family-based, and some employment-based,1 visa petitions are required to submit an Affidavit of Support on. CitizenPath provides an affordable service to help you quickly and accurately prepare Form I134, Declaration of Financial Support, for your situation. If you are coming to the United States on a temporary visa, you may need to prove financial support. A sponsor can file the I-134 form. An Affidavit of Support proves you have a financial sponsor when seeking a family-based immigrant visa. Schengen (Short stay) Visa Application Form (up to 90 days). Form I864, Affidavit of Support, needs to be filed DHS if you are a U.S. citizen or LPR planning to sponsor a spouse or family member. Your sponsor's ID (original if he or she comes to the interview with you, or a notarized copy, if they can not come to the interview).