Ill. Admin. Code tit. 56, § 200.230
a) If an employer frontloads leave by providing to its employees the minimum required number of paid leave hours available for use on the employee's first day of employment or the first day of any 12-month period, the employer is subject to the following requirements:
1) The employer shall give written notice to the employee informing the employee of how many paid leave hours that employee is receiving on or before the first day of initial employment or on or before the first day of the initial 12-month period, and before the employer changes the amount of leave the employee receives via frontloading.
2) Each 12-month period shall renew consecutively for the duration of employment unless employer does all of the following (see Section 15(d) of the Act):
3) An employee who receives frontloaded paid leave on the first day of any 12-month period shall continue to receive paid leave hours on the first day of any consecutive 12-month period unless the employer does the following (see Section 15(d) of the Act):