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, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents.INSTRUCTIONS: Complete all applicable sections below in full. Signatures of applicant, sponsor, and bank must be included. This form acts as proof that you are financially capable of managing your stay in the United States. In this video we're going to show you how to complete an i 864 and affidavit of support that is needed as part of the package for an adjustment of status. Some applicants use what is known as an Affidavit of Support or Form I-134. You will need to make an appointment for an interview with a Consular Officer at an American Embassy or Consulate local to the city where you reside. Application Process. Step I – Book a Course.