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.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. Completing and signing Form I-864 makes you the sponsor. Complete this form with your credit card information. An affidavit of support, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents. An Affidavit of Support is U.S. Immigration Form I-864. 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. Handwritten forms are hard to read.