The petitioner may fill out an Affidavit of Support, Form I-134. 864 Affidavit of support How to fill out the Form 864 immigration Tips US mmigration with Attorney Jacob SapochnickIf 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. 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. 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. After the appropriate form with documentation is complete, the petitioner should send it to the National Visa Center. What does the NVC do with the I-864? 1 fiancee visa couple must complete both the I134 and the I864 forms. However, the forms are not filed together.