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.Providing low-cost, high quality immigration services that enable eligible immigrants to obtain legal immigrant or citizenship status. 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. You must also submit an affidavit of support for your parent, referred to as the I-864 form. Visa application form. Each applicant must complete and sign a visa application, filling out every section. Documents and Requests for International Students. Complete the online request form for the document you are requesting. Each applicant must complete and sign a visa application, filling in each of its sections.