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. This affidavit is a contract between a sponsor and the U.S. Government.Completing and signing Form I-864 makes you the sponsor. The intending immigrant must complete an I864A only if he or she will be immigrating with a derivative spouse or child. An affidavit of support, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents. This article will attempt to address some of the most common situations that result in RFEs and will hopefully serve as a basic guide to completing the form. Step 1: Complete an OCC Admissions application. Prospective F-1 international students must complete the online application for admission.