Section 625 ILCS 27/25 - Mandatory charges(a) As used in this Section, "mandatory charge" means any charge, surcharge, or fee in addition to the base rental rate for an item or service provided in connection with the rental transaction that the renter does not have the option of avoiding or declining and that is not otherwise imposed by law.(b) A rental agreement containing any mandatory charge shall prominently display and fully disclose the charge separately on the face of the agreement.(c) A mandatory charge shall also be prominently displayed and fully disclosed in all price advertising, price displays, price quotes, and price offers, including displays in computerized reservation systems.(d) Notwithstanding the foregoing, a rental company may not impose or require the purchase of a damage waiver as a mandatory charge. P.A. 90-113, eff. 7/14/1997.