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.Form I864, also known as the Affidavit of Support. This crucial piece of paperwork serves as a financial guarantee during the immigration process. Completing and signing Form I-864 makes you the sponsor. If you are coming to the United States on a temporary visa, you may need to prove financial support. A sponsor can file the I-134 form. 864 Affidavit of support How to fill out the Form 864 immigration Tips US mmigration with Attorney Jacob Sapochnick 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. Your document must be in English.