80 Ill. Adm. Code 331.20
Timeliness
Section 331
Section 331.20 Timeliness
Any claim for back wages shall
be received in the Department not later than 365 days after the occurrence of
the action provided in Section 331.7 giving rise to or creating the
authorization for the claim, except that any claim pending before another forum
on January 31, 1986, shall be exempt from such requirement.