(1) Subject to 19-3-514, a member with at least 5 years of membership service may, at any time before retirement, file a written application with the board to purchase 1 year of additional service credit for each 5 years of membership service.
(2) To purchase this service credit under this section, a member shall pay the actuarial cost of the service credit, based on the system's most recent actuarial valuation.
(3) Service credit purchased under this section is not membership service and may not be used to qualify a member for service retirement or to bring a member to 25 years of membership service for the purposes of 19-3-902 or 19-3-904.
(4) Purchases of one-for-five service will be used to adjust the early retirement reduction required in 19-3-906, if applicable.