Your sponsor must fill out the attached form. Both you and your sponsor must sign this form. •.I am providing this affidavit to verify my income as I have no other income documentation available to me. Learn how to create an accurate affidavit letter with our free printable templates. Follow the two-step process below to guide the selection. Follow the two-step process below to guide the selection. I certify that the information given in this letter and the copies of financial proof are complete and true. However, they don't need to fill out form I-864A. In the case of a joint sponsor, they may be unrelated to the visa applicant.