80 Ill. Adm. Code 1650.310
Effective Date of Membership
Section 1650
Section 1650.310 Effective
Date of Membership
a) The effective date of membership in the System shall be the
date of employment by an employer, as recorded by the employer.
b) In the absence of a record of the date of employment in the
official proceedings of the qualifying employer, the date of membership shall
be the first payroll day for which contributions were required.
c) For purposes of calculating the required contributions to
purchase military service not immediately following employment under the
provisions of 40 ILCS 5/16-128(a)(iii), and/or to purchase private school
teaching under the provisions of 40 ILCS 5/16-128(d-5) in the absence of
official records documenting the date of first full-time employment as a
teacher, the date of first membership shall be defined as July 1 of the first
year of System contributing service.