Iowa Code § 97B.49E

(1) For each active member retiring on or after June 30, 1973, and who has completed ten or more years of membership service, the total amount of monthly benefit payable at the normal retirement date for prior service and membership service shall not be less than fifty dollars per month. If benefits commence on an early retirement date, the amount of benefit shall be reduced in accordance with section 97B.50. If an optional allowance is selected under section 97B.51, the amount payable shall be the actuarial equivalent of the minimum benefit. An employee who is in employment on a school year or academic year basis, will be considered to be an active member as of June 30, 1973, if the employee completed the 1972-1973 school year or academic year.

(2) Effective January 1, 1997, for members who retired on or after July 1, 1953, and before July 1, 1990, with at least ten years of prior and membership service, the minimum monthly benefit payable at the normal retirement date for prior and membership service shall be two hundred dollars. The minimum monthly benefit payable shall be increased by ten dollars for each year of prior and membership service beyond ten years, up to a maximum of twenty additional years of prior and membership service. If benefits commenced on an early retirement date, the amount of the benefit shall be reduced in accordance with section 97B.50. If an optional allowance was selected under section 97B.51, the amount payable shall be the actuarial equivalent of the minimum benefit.

98 Acts, ch 1183, §39