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. Line-by-line guidance for properly filling out USCIS's I-864 Affidavit of Support to sponsor an immigrating family member.In this video I'm going to show you how to fill form i-130 for that's going to be part of your affidavit of support documents. In this guide, we will explain who needs to complete Form I864, when to file it, and how to fill out Form I864 stepbystep. 1 fiancee visa couple must complete both the I134 and the I864 forms. However, the forms are not filed together. 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. Note: Mistakes in completing the I-864 are a common reason for delays with an immigrant visa application. 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.