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.The purpose of the Affidavit is to assist consular officers in determining whether a visa applicant will have adequate means of financial support in the US. This form acts as proof that you are financially capable of managing your stay in the United States. 864 Affidavit of support How to fill out the Form 864 immigration Tips US mmigration with Attorney Jacob Sapochnick As it is necessary to show the requisite financial support, you must fill out Parts A and B, then sign your name at the bottom of this page. The Affidavit of Support is required to issue the SEVIS I-20 or DS-2019 for all incoming international students who will pursue F or J status. If you are not provided a form to complete for an affidavit of support, you will have to write your own. A Form I-20 is necessary to apply for an F-1 student visa and to enter the US as an F-1 student. If you prepared your Form I-864, it's only necessary to sign as the "sponsor.