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.You, the sponsor (petitioner), and the joint sponsor must complete Form I-864. See tips for completing Form I-864. This video will help you to fill out I-864 For Joint Sponsor. The I-864, Affidavit of Support is a required piece of paperwork in all family-based immigration cases, including those based on marriage. 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. Financial sponsors for green card applicants use Form I-864, Affidavit of Support, to remove the public charge grounds for inadmissibility. This form and any proof submitted do not guarantee the issuance of a Texas driver license or identification card. 1. Multiple sponsors: You are permitted to have more than one sponsor.