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. 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.There is what is known as I 864- affidavit of support. This is not mandatory, in the case of F1 sponsors. Download form I-864 from the USCIS website, fill it out precisely and send it in with the necessary financial documentation to get an affidavit of support. There is no requirement for an affidavit of support for an F1 visa. However, you DO need a plan that is credible. Completing and signing Form I-864 makes you the sponsor. There is an online visa application available, which allows you to complete and print Form DS-160 to take to your F-1 visa interview. Hi there, I'm struggling with how to fill out the I864 and will be very appreciated if anyone can help me out.