AC = Termination of employment. AC = Termination of employment. CAUTION: Federal regulation requires that INS I-9 forms be retained for 3 years from date of hire or 1 year after separation of the employee, whichever is later. Agencies should make certain that the INS I-9 forms for employees who terminate from the University less than 3 years from date of hire are kept for the 3 years retention period. 8 CFR 274a.2(b)(2)(i)(A) and (c)(2).