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 is US Immigration Form I-864.This video will help you to fill out I-864 For Joint Sponsor. You, the sponsor (petitioner), and the joint sponsor must complete Form I-864. See tips for completing Form I-864. Form I-864EZ is a shorter form used for petitioners only sponsoring one person and only a salary or pension as income. In today's video we are going to be filling out form i 864 the affidavit of support form for the joint sponsor. Form I-864, also known as an affidavit of support, is commonly required during green card application for many categories. All students will submit a signed UT Dallas Financial Affidavit with their application. Please read the form carefully and fill it in completely.