815 ILCS 636/10.55
The difference between the amount owed (or which would be owed in the absence of gap protection) by the lessee under the consumer lease in the event of a total loss of the vehicle prior to the end of the lease term occasioned by its theft, physical damage, or other occurrence as specified in the consumer lease and the actual cash value or portion of the actual cash value of the vehicle, actually received by the lessor from the insurance company or from any other person. The term gap amount shall not include any deductible amount applicable to an insurance policy maintained by the lessee or any past due amounts owed by the lessee as of the time of the receipt by the lessor of the insurance proceeds or any other amount due because of the lessee's default.
815 ILCS 636/10.55