A person entering service on or after January 1, 1972 and prior to January 1, 1984 shall become a member as a condition of employment and shall begin making contributions as of the first day of employment.
A person entering service on or after January 1, 1984 shall, upon completion of 6 months of continuous service which is not interrupted by a break of more than 2 months, become a member as a condition of employment. Contributions shall begin the first of the month after completion of the qualifying period.
A person employed by the Chicago Metropolitan Agency for Planning on the effective date of this amendatory Act of the 95th General Assembly who was a member of this System as an employee of the Chicago Area Transportation Study and makes an election under Section 14-104.13 to participate in this System for his or her employment with the Chicago Metropolitan Agency for Planning.
The qualifying period of 6 months of service is not applicable to: (1) a person who has been granted credit for service in a position covered by the State Universities Retirement System, the Teachers' Retirement System of the State of Illinois, the General Assembly Retirement System, or the Judges Retirement System of Illinois unless that service has been forfeited under the laws of those systems; (2) a person entering service on or after July 1, 1991 in a noncovered position; (3) a person to whom Section 14-108.2a or 14-108.2b applies; or (4) a person to whom subsection (a-5) of this Section applies.
A person who is an employee as defined in this subsection (c) may establish service credit for similar employment prior to becoming an employee under this subsection by paying to the System for that employment the contributions specified in this subsection, plus interest at the effective rate from the date of service to the date of payment. However, credit shall not be granted under this subsection (c) for any such prior employment for which the applicant received credit under any other provision of this Code or during which the applicant was on a leave of absence.
A person who is an employee as described in this subsection (d) may establish service credit for employment as a Human Rights Commissioner that occurred on or after June 1, 2019 and before establishing service under this subsection by paying to the System for that employment the contributions specified in paragraph (1) of subsection (a) of Section 14-133, plus regular interest from the date of service to the date of payment.
40 ILCS 5/14-103.05