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. In this guide, we will explain who needs to complete Form I864, when to file it, and how to fill out Form I864 stepbystep.This form is required in most familybased green card applications, including CR1 and IR1 spouse visas and some employmentbased green card applications. The "Affidavit of Support" is a signed document to accept financial responsibility for a family member who is seeking a green card. An Affidavit of Support sponsor must be at least 18 years old and must be either a U.S. citizen or a lawful permanent resident. Evidence of financial support (Form I-134, Affidavit of Support, may be requested). Two (2) 2×2 photographs. The two most common applications where the I134 is used are for humanitarian parole and for a fiancé(e) nonimmigrant visa. A Form I864, Affidavit of Support under Section 864A of the INA. An affidavit of support makes the petitioner prove that they're financially capable of providing for the immigrant they sponsored.