Retainage Disputes in Illinois: What Contractors and Subcontractors Can Do When Payment Is Withheld

You finished the work. The project is complete - or nearly so. But the owner is holding back thousands of dollars in retainage, and the release keeps getting delayed. Maybe they say there are punch list items still open. Maybe they just stop responding. Meanwhile, you have suppliers to pay, payroll to cover, and no clear timeline for when that money will actually arrive.

Retainage disputes are one of the most common - and most frustrating - payment problems in Illinois construction. Unlike nonpayment for completed work, retainage is withheld by design. Both parties expect it. The problem is that some owners treat it as a slush fund, holding it far longer than the law allows, using it as leverage on unrelated disputes, or refusing to reduce it even after the project crosses the statutory halfway mark.

Illinois has tightened its retainage laws significantly over the last six years. Contractors and subcontractors now have clear statutory rights - caps on how much can be withheld, deadlines for release, and penalties for owners who ignore the rules. If an owner is sitting on your retainage, you are not just waiting. You have options.

What Is Retainage and How Does It Work on Illinois Construction Projects?

Retainage - sometimes called retention - is a percentage of each progress payment that an owner withholds from the contractor until the project reaches completion or some agreed milestone. Subcontractors face the same practice from general contractors. The idea is to give the owner (or GC) financial leverage to ensure the work gets finished and any defects get corrected.

In practice, retainage typically ranges from 5% to 10% of each payment. On a $500,000 contract at 10% retainage, $50,000 sits in the owner's hands throughout the project. On larger commercial jobs, that number can be substantial - sometimes exceeding what the contractor has in profit on the job.

Retainage has always been a cash flow burden on contractors and subcontractors. Illinois recognized this and passed three waves of reform since 2019, each one tightening the rules on how much can be withheld and when it must be released.

Illinois Retainage Law: What the Caps Actually Are

Illinois law does not leave retainage entirely to contract negotiation. It sets statutory limits that apply regardless of what the parties agreed to in writing.

Private Construction Projects

The Illinois Contractor Prompt Payment Act (815 ILCS 603/20), amended effective August 20, 2019, governs retainage on most private commercial construction projects. The rules are straightforward:

• Before 50% completion: an owner may withhold no more than 10% of each progress payment
• At 50% completion: retainage must be reduced so that no more than 5% is held in total, and no more than 5% may be withheld from any subsequent payments

The Act applies to contracts between owners and general contractors, and also to subcontracts between GCs and subs. It does not apply to residential projects involving 12 or fewer units in a single building.

One important detail: the 50% threshold is calculated per contract, not per the overall project. A subcontractor whose own scope of work is 50% complete is entitled to the retainage reduction - even if the overall project is only 35% done. This creates a timing gap that can leave general contractors obligated to pay out more to subs than they are currently receiving from the owner.

Local Government Projects

Effective January 1, 2024, the Illinois Public Construction Bond Act (30 ILCS 550/1) was amended to impose the same 10%/5% caps on local government construction projects. This covers counties, townships, municipalities, school districts, park districts, and other local governmental units. The restrictions apply to retainage held from prime contractors and from first- and second-tier subcontractors on covered public projects.

State Agency Projects

In 2025, the Illinois legislature passed HB1224 (effective June 1, 2027), extending retainage caps to most state agency construction contracts. The law goes a step further than prior reforms - it disfavors withholding any retainage at all on state projects except on a case-by-case basis with documented justification tied to specific contract performance, and it prohibits a contractor from withholding more from a subcontractor than the state agency has withheld from the contractor for that sub's work.

When Does Retainage Have to Be Released?

The caps tell you how much can be withheld. The Contractor Prompt Payment Act also governs when retainage has to be paid. On private projects, once a contractor submits a payment application - including a request for retainage release - the owner has 25 days to approve or dispute it. If approved, payment must follow within 15 days. That is 40 days total from submission to payment.

If the owner disputes the application, they must send written notice during the 25-day window identifying the specific amount in dispute and the reason. Silence is not a valid dispute. An owner who fails to send timely notice is deemed to have approved the payment.

Once a GC receives payment from the owner, subcontractors must be paid within 15 days.

These deadlines matter because missing them triggers real consequences. A party that fails to pay on time is liable for the amount owed plus 10% annual interest under Section 15 of the Contractor Prompt Payment Act.

What Counts as Wrongful Withholding?

Not every delay is a statutory violation. Owners do have legitimate grounds to dispute payment when there are genuine defects or incomplete work. But several specific practices cross the line:

Holding more than the statutory cap. Any retainage above 10% before the 50% mark - or above 5% after it - violates the Prompt Payment Act. The contract cannot override this. If an owner's contract purports to allow 15% retainage, that provision is unenforceable.

Failing to reduce at the halfway point. Once the contract is 50% complete, the owner must release the excess. Waiting until final completion to settle up the difference is not permitted under the statute.

Using retainage as leverage for unrelated disputes. An owner cannot hold your retainage hostage because of a disagreement on a change order, a billing dispute on another phase, or any other issue outside the specific payment application at issue. Retainage is tied to completion and performance - not to whatever else the parties happen to be fighting about.

Not paying after approval. If the owner has approved your payment application and the 15-day payment window has passed, you have a clear statutory claim. Approval without payment is a textbook violation.

Disputing without basis. Sending a boilerplate dispute letter to stop the clock - without a genuine, documented reason tied to the specific work - does not protect the owner from liability under the Act.

Your Legal Options When Retainage Is Withheld

If an owner is sitting on your retainage past the statutory deadlines, you have several tools available. The right approach depends on how much is owed, where the project stands, and how the owner has responded to your requests.

Start With a Written Demand

Before taking formal legal action, send a written demand letter by certified mail. State exactly how much retainage is owed, identify the applicable statute, reference the payment deadlines that have passed, and give a clear deadline for payment - typically 10 to 14 days. Many owners release retainage promptly once they understand that the contractor knows the law and is prepared to enforce it.

File a Mechanics Lien

Unpaid retainage is a valid basis for a mechanics lien under the Illinois Mechanics Lien Act (770 ILCS 60). If the project involved private property and you have not received the retainage you are owed, a lien gives you a security interest in the property itself.

A mechanics lien is particularly powerful because it clouds the owner's title - making it difficult or impossible to sell or refinance the property until the lien is resolved. Owners who are trying to close a sale or a construction loan have strong incentive to pay rather than litigate.

Contractors dealing with unpaid retainage should also track their mechanics lien deadlines carefully. In Illinois, the right to record a lien can expire long before a retainage dispute is fully resolved - meaning you could win the legal argument and still lose the lien if you waited too long to file.

Sue Under the Contractor Prompt Payment Act

A lawsuit under the Prompt Payment Act lets you recover the unpaid retainage plus 10% annual interest from the date payment was due. This is a statutory remedy that does not require you to prove bad faith - just that the payment was not made within the statutory window.

Combine Both Remedies

Filing a mechanics lien and pursuing a Prompt Payment Act claim are not mutually exclusive - in fact, combining them often produces the fastest resolution. The lien creates urgency on the owner's side. The accruing interest adds up quickly on larger balances. Together, they give you significant leverage without having to wait years for a trial.

If you are dealing with a retainage dispute on an Illinois construction project, contact us. We can review the payment history, identify violations of the Prompt Payment Act, and help you recover the retainage you are owed.

Retainage Disputes Between General Contractors and Subcontractors

The same rules that govern owner-contractor relationships also apply between GCs and subs. A general contractor cannot hold more retainage from a subcontractor than the statutory caps allow - even if the owner is holding the GC to a slower release schedule.

The situation that creates genuine complexity is the 50% per-subcontract rule. If a specialty subcontractor finishes their scope early, their individual contract may cross the 50% threshold well before the overall project does. At that point, the GC is legally required to reduce retainage for that sub - even while the owner is still withholding 10% from the GC on the overall job. General contractors need to track each subcontract's completion percentage independently, not just the overall project percentage.

If a GC is improperly holding your retainage past the statutory deadlines, you have the same rights as a contractor dealing with a nonpaying owner: a written demand, a mechanics lien, and a Prompt Payment Act claim with interest. For more on your options when a GC or owner stops paying altogether, see our post on when a contractor can stop work for nonpayment in Illinois.

How to Protect Yourself Before a Dispute Starts

The best retainage dispute is one that never happens. A few practices make a significant difference:

Track 50% completion on every contract and subcontract separately. Keep running records of the value of work completed under each contract. The moment a contract crosses the 50% mark, submit a formal written request for retainage reduction immediately. Do not wait for the other party to bring it up.

Submit formal written pay applications. The Prompt Payment Act's deadlines run from the submission of a payment application. Verbal requests and informal emails do not start the clock the same way. Use written, signed payment applications for every billing cycle - including standalone retainage requests when appropriate.

Document every approval. If an owner or GC approves your pay app - even informally via email - save it. Approval without timely payment is a statutory violation, and your documentation is what makes that case in court.

Review your contract before you sign. Some contracts attempt to condition retainage release on events that go beyond what the statute requires - full project completion, resolution of all punch list items, receipt of a certificate of occupancy. An attorney can identify provisions that conflict with your statutory rights before you are locked into them.

For more on payment rights and remedies in Illinois construction, see our payment disputes practice page. If the situation has escalated to the point where you are considering stopping work, our post on contractor rights during nonpayment covers the requirements and risks. And if you have already exchanged lien waivers, our article on lien waivers in Illinois construction explains how those documents interact with your retainage rights.