There are several types of Affidavit of Support forms (I-864, I-864EZ, I-864W, and I-864A). 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 is U.S. Immigration Form I-864. 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. 1 Complete I-20 Application. Mail complete packet to: San Antonio College. It proves an application for a visa has sufficient financial means and is unlikely to become a public charge while in the country. Ease the transition to the United States, San Antonio, and Trinity University, and understand requirements and documents. Individuals applying through a U.S. embassy or consulate will submit the I-864 affidavit to the National Visa Center when it is requested. Louis and San Antonio, Texas campuses.