(40 ILCS 5/16-181.3)
Sec. 16-181.3. To prescribe the manner of payment. To prescribe by rule the manner of repaying refunds and purchasing the various optional service credits permitted under this Article. The rules may prescribe the conditions under which installment payments or partial payments may be accepted and may specify the method of computing any interest due.
(Source: P.A. 90-448, eff. 8-16-97.)