740 ILCS 170/4.2
If the employee has not served a Revocation Notice Form as provided in Section 4.1 of this Act or has not otherwise served the creditor with a written notice of revocation (if the wage assignment is revocable under federal law) as provided in this Act within 20 days after receiving the notice of intention to make a demand, the creditor may proceed with his demand, and the employer shall commence payment to the creditor not sooner than 5 business days after service of such demand, if no revocation notice has been received by the employer . If the employee cures the default stated in the demand or revokes the wage assignment, the creditor shall notify the employer and release the demand. No employer shall be liable for payments made in compliance with this Section.
If a Revocation Notice Form as set forth in Section 4.1 of this Act or other written notice of revocation from the employee is received by an employer, no wages are subject to a demand served by the creditor for that wage assignment and the employer shall cease any deduction of wages currently taking place for that wage assignment, unless the employer receives a copy of a subsequent written agreement between the creditor and employee authorizing such payments. If such an agreement is not reached, the creditor may not institute further proceedings on the wage assignment.
740 ILCS 170/4.2