35 ILCS 5/712
Every payor who deducts and withholds or is required to deduct and withhold tax under Sections 709.5 or 710 is liable for such tax. For purposes of assessment and collection, any amount withheld or required to be withheld and paid over to the Department, and any penalties and interest with respect thereto, shall be considered the tax of the payor. Any amount of tax actually deducted and withheld under Sections 709.5 or 710 shall be held to be a special fund in trust for the Department. No payee shall have any right of action against his payor in respect of any money deducted and withheld and paid over to the Department in compliance or in intended compliance with Sections 709.5 or 710 (and until January 1, 1989, Sections 708 and 709).
35 ILCS 5/712