80 Ill. Adm. Code 1540.220
Period for Payment and Amount of Payment of Contributions
Section 1540
Section 1540.220 Period for
Payment and Amount of Payment of Contributions
a) Period for Payment
An eligible member shall exercise an option or options to pay
contributions to establish credit for service within the deadline or time frame
provided by law and shall make the required payment(s) by the later of any
deadline or time frame provided by law or 30 days from the date written
notification of the amount due is mailed to the member.
b) Amount of Payment
Any member making a payment to the System which includes
interest as a part of such payment shall pay the required amount 30 days from
the date formal notification of the amount payable is sent to the member or the
end of the month to which interest was computed in the required amount. If
payment is made after the later of these dates additional interest will be
charged to the end of the month in which payment is received in the Springfield
Office of the System.