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. A) Complete an Affidavit of Support form and; b) Gather evidence of their finances and other supporting documents (See Step 5).Completing and signing Form I-864 makes you the sponsor. Do you need an attorney to help you with an addifavit of support I-864? Contact Shawn Mughal and excellent immigation Attorney in Alexandria. Here we'll answer the most frequently asked questions about completing form I 134 for cases like the fiance visa or humanitarian parole. An affidavit of support, (USCIS Form I-864), is required for all immediate relatives of US citizens and lawful permanent residents. They include tax returns, an employment confirmation letter and three recent check stubs or proof of income for the sponsor or petitioner. Financial forms can be tricky to complete. Note: Mistakes in completing the I-864 are a common reason for delays with an immigrant visa application.