A)Â First Name [Lines 1, 3, 9, 11, 15, 27, 35, 38, 46] SSN + last 4 digits. (Lines 14, 25, 41, 46) B)Â Middle Name or Last Name [Lines 11, 13, 19, 28, 48] SSN + last 4 digits. (Lines 5, 14, 25, 41, 46) C)Â Suffix(BS)Â (Required if you choose a Social Security Number or employer identification number) SSN:Â 1) First name, last name.