If you have a joint sponsor, they must also complete Form I864. 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.In today's video we are going to be filling out form i 864 the affidavit of support form for the joint sponsor. 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. If you are filing Form I864 as the petitioning sponsor, use our How to Fill Out Affidavit of Support Form I864 guide. Enter anticipated income, not what the sponsor paid in taxes last year. The couple can include George's income to show that they meet the Affidavit of. Support requirements because he has employment authorization through DACA.