35 ILCS 525/10-40

(a) Persons engaged in the business of providing valet services are subject to the tax imposed by this Act on the purchase price received in connection with their valet parking operations. (b) Persons engaged in the business of providing valet services are entitled to take the credit in subsection (c) of Section 10-10. (c) Tips received by persons parking cars for persons engaged in the business of providing valet services are not subject to the tax imposed by this Act if the tips are retained by the person receiving the tip. If the tips are turned over to the valet business, the tips shall be included in the purchase price.