Section 40 ILCS 5/10-104.4 - Transfer of creditable service to Article 8, 9 or 13 Fund(a) Any city officer as defined in Section 8-243.2 of this Code, any county officer elected by vote of the people who is a participant in the pension fund established under Article 9 of this Code, and any elected sanitary district commissioner who is a participant in a pension fund established under Article 13 of this Code, may apply for transfer of his credits and creditable service accumulated under this Fund to such Article 8, 9 or 13 fund. Such creditable service shall be transferred forthwith. Payment by this Fund to the Article 8, 9 or 13 fund shall be made at the same time and shall consist of: (1) the amounts accumulated to the credit of the applicant, including interest, on the books of the Fund on the date of transfer, but excluding any additional or optional credits, which credits shall be refunded to the applicant; and(2) employer contributions computed by the Board and credited to the applicant under this Article, including interest, on the books of the Fund on the date the applicant terminated service under the Fund. Participation in this Fund as to any credits transferred under this Section shall terminate on the date of transfer.
(b) Any such elected city officer, county officer or sanitary district commissioner who has credits and creditable service under the Fund may establish additional credits and creditable service for periods during which he could have elected to participate but did not so elect. Credits and creditable service may be established by payment to the Fund of an amount equal to the contributions he would have made if he had elected to participate, plus interest to the date of payment.(c) Any such elected city officer, county officer or sanitary district commissioner may reinstate credits and creditable service terminated upon receipt of a separation benefit, by payment to the Fund of the amount of the separation benefit plus interest thereon to the date of payment.