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. Form I134 is used to document the personal finances of a sponsor who lives in the United States.In order to fill out an affidavit of support as a sponsor, you must be a U.S. citizen or green card holder. Use the form below and I'll do my best to get back to you within one business day. Want us to take a look at your potential case under the Affidavit of Support? Petitioners who are sponsoring immediate relatives for their green cards need to complete an "Affidavit of Support" as part of the application process. The person who is petitioning on behalf of the immigrant visitor fills out Form I-134. NW.. Washington,.DC.20044. 1.- One Application form ( National Visa Application form): Each applicant must complete and sign a national visa application, filling out every section. It's also called an Affidavit of Support.