A contractor, who refuses to make prompt payment within 10 business days or 15 calendar days, whichever occurs earlier, after receiving payment, in whole or in part, shall provide to the subcontractor or material supplier and the public owner or its agent, a written notice of that refusal. The written notice shall be made by a contractor no later than 5 calendar days after payment is received by the contractor. The written notice shall identify the Department of Transportation's contract, any subcontract or material purchase agreement, a detailed reason for refusal, the value of the payment to be withheld, and the specific remedial actions required of the subcontractor or material supplier so that payment may be made. Written notice of refusal may be given in a form and method which is acceptable to the parties and public owner.
"Payment" means the discharge of an obligation in money or other valuable consideration or thing delivered in full or partial satisfaction of an obligation to pay. "Payment" shall include interest paid pursuant to this Act.
"Reasonable cause" may include, but is not limited to, unsatisfactory workmanship or materials; failure to provide documentation required by the contract, subcontract, or material purchase agreement; claims made against the Department of Transportation or the subcontractor pursuant to subsection (c) of Section 23 of the Mechanics Lien Act or the Public Construction Bond Act; judgments, levies, garnishments, or other court-ordered assessments or offsets in favor of the Department of Transportation or other State agency entered against a subcontractor or material supplier. "Reasonable cause" does not include payments issued to the contractor that create a negative or reduced valuation pay application or pay estimate due to a reduction of contract quantities or work not performed or provided by the subcontractor or material supplier; the interception or withholding of funds for reasons not related to the subcontractor's or material supplier's work on the contract; anticipated claims or assessments of third parties not a party related to the contract or subcontract; asserted claims or assessments of third parties that are not authorized by court order, administrative tribunal, or statute. "Reasonable cause" further does not include the withholding, offset, or reduction of payment, in whole or in part, due to the assessment of liquidated damages or penalties assessed by the Department of Transportation against the contractor, unless the subcontractor's performance or supplied materials were the sole and proximate cause of the liquidated damage or penalty.
30 ILCS 540/7