A) Complete an Affidavit of Support form and; b) Gather evidence of their finances and other supporting documents (See Step 5). 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.Learn about the I-134 affidavit of support form, its requirements, and how to complete it. Ensure your visa application process is smooth with us. A letter of invitation or Affidavit of Support is not needed to apply for a visitor visa. Applicants for a B2 tourist visa should NOT submit the I-864 Affidavit of Support or any other official US document pertaining to their finances. 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. Download form I-864 from the USCIS website, fill it out precisely and send it in with the necessary financial documentation to get an affidavit of support. U.S. Citizenship and Immigration Services (USCIS) requires a legal document called the affidavit of support, sometimes referred to as form I-864. The person who is petitioning on behalf of the immigrant visitor fills out Form I-134.