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.864 Affidavit of support How to fill out the Form 864 immigration Tips US mmigration with Attorney Jacob Sapochnick If you are coming to the United States on a temporary visa, you may need to prove financial support. A sponsor can file the I-134 form. We prefer that you complete the form(s) online. After the form is completed on the computer, it must be printed and mailed as instructed. Individuals immigrating through most family-based, and some employment-based,1 visa petitions are required to submit an Affidavit of Support on. After the appropriate form with documentation is complete, the petitioner should send it to the National Visa Center. What does the NVC do with the I-864?