Completing and signing Form I-864 makes you the sponsor. 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 I-134 is a promise to financially support a person applying for a temporary visa to the United States, namely a travel visa or a K-1 fiancé visa. 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. What are the steps to complete an Affidavit of Support? Adjudicating a visa application, a Department of Homeland. Which one we have to fill out for K1 visa? The purpose of Affidavit of Support, Form I-134 is to affirm that a sponsor of a US Visa applicant can financially support the applicant while in the US. If you have a joint sponsor, the joint sponsor must also complete USCIS Form I-864, not Form I-864A. To do this, the I130 petitioner must fill out Form I864, Affidavit of Support.