215 ILCS 5/462a
A policy of workers' compensation insurance issued, delivered, amended, or renewed on or after January 1, 2019 shall remain in full force and effect subject to the same terms and conditions, loss cost multipliers, and classification of the employer with regard to the payment of dividends, unless written notice is mailed or delivered by the insurer to the employer, at the address shown on the policy, and to the employer's authorized agent or broker, indicating the insurer's intention to condition renewal upon issuance of a policy that supersedes the policy previously issued and that will result in a premium in excess of 5% above the rate recommendation filed with the Department, exclusive of any premium increase generated as a result of increased loss costs or increased exposure units or as a result of experience rating, contractor credit adjustment program, large deductible, retrospective rating, or audit. The notice shall be delivered at least 30 days in advance of the expiration date of the policy, and shall set forth: (1) the amount of the premium increase or, if the amount cannot reasonably be determined as of the time the notice is provided, a reasonable estimate of the premium increase based upon the information available to the insurer at that time; and (2) the reason for the increased premium in excess of the rate recommendation filed with the Department. Nothing in this Section requires the insurer to provide notice when the employer, an agent or broker authorized by the employer, or another insurer of the employer has delivered written notice that the policy has been replaced or is no longer desired.
215 ILCS 5/462a