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 "Affidavit of Support" is a signed document to accept financial responsibility for a family member who is seeking a green card.To access DS-260, you will need to enter your DV visa case number. A separate form is required for each visa applicant. Form I864, Affidavit of Support, needs to be filed DHS if you are a U.S. citizen or LPR planning to sponsor a spouse or family member. This affidavit of support is a person so they have to prove that they're making money not only to support their own family but also to support you. The sponsor then fills out Form I-134, provides proof of their ability to financially support the applicant, and signs the document. It demonstrates that the immigrant has adequate financial support and is unlikely to rely on U.S. government assistance. Key Components and Requirements. Need help to fill out your Affidavit of Support?