Illinois Lien on Public Funds: How Subcontractors and Suppliers Get Paid on Public Projects

If you are a subcontractor or material supplier owed money on an Illinois public construction project, you cannot file a traditional mechanic lien against the property. Government-owned land and buildings are exempt from mechanic liens. But Illinois law provides a powerful alternative: the lien on public funds under Section 23 of the Illinois Mechanics Lien Act (770 ILCS 60/23).

An Illinois lien on public funds allows you to intercept money the public body still owes to the prime contractor and have it held for your benefit. It applies to every type of public construction project in Illinois — municipal buildings, public schools, county courthouses, park district facilities, water reclamation plants, state highway jobs, and any other project funded by a unit of government.

This guide explains exactly how to file a lien on public funds in Illinois, who qualifies, what the deadlines are, and the critical mistakes that permanently kill claims. Two deadlines matter above all else: (1) serve your notice before the contract funds are fully disbursed, and (2) file a lawsuit within 90 days of serving that notice.

What Projects Qualify for a Lien on Public Funds in Illinois?

The lien on public funds under 770 ILCS 60/23 applies to all public improvement contracts in Illinois. That includes projects owned or funded by:

• The State of Illinois and state agencies (including IDOT, CDB, and DCEO)
• Counties and county boards
• Townships
• Cities and municipalities
• Municipal corporations
• School districts (K-12 and community colleges)
• Park districts
• Water reclamation districts and sanitary districts
• Other units of local government created under Illinois law

The scope is broad. Any construction project where the property is owned by a governmental body and the work is performed under a public improvement contract qualifies.

Who can file? The lien on public funds is available to subcontractors and material suppliers who furnished labor or materials for the public project but were not paid by the prime contractor or an intermediate subcontractor. General contractors who have a direct contract with the public body generally do not have lien on public funds rights — this remedy exists specifically for lower-tier claimants who lack a direct contractual relationship with the government.

Step-by-Step: How to File an Illinois Lien on Public Funds

Filing a lien on public funds under 770 ILCS 60/23 requires strict compliance with the statute. Each step matters, and errors in any one of them can permanently forfeit your claim.

Step 1 — Prepare the Notice of Lien

The notice must be a sworn, notarized statement containing the following information:

• Identification of the public improvement contract between the public body and the prime contractor (contract number, project name, and location)
• A description of the labor performed or materials furnished by the claimant
• The total amount due and unpaid, itemized to show what was earned and what remains outstanding
• The name of the party who hired the claimant (whether the prime contractor or an intermediate subcontractor)

An unnotarized notice is defective and may not trigger the public body's obligation to withhold funds. Do not skip the notarization.

Step 2 — Serve the Notice on the Correct Parties

Proper service is where many lien on public funds claims fail. The notice must be served on both the public body and the prime contractor. Who counts as the correct officer at the public body depends on the type of project:

• State projects (IDOT, state agencies): Serve the Secretary of Transportation or the director or official responsible for administering the contract, plus the prime contractor, plus any intermediate subcontractor if applicable.
• Local projects (cities, counties, school districts, park districts): Serve the clerk, secretary, or designated officer of the public body, plus the prime contractor.

Service must be made by certified mail (addressee only) or personal delivery. Regular mail is not sufficient. Keep proof of service — you will need it if the matter proceeds to litigation.

Timing is everything. There is no hard statutory deadline to serve the notice, but the lien only attaches to funds the public body has not yet disbursed to the prime contractor. Once all contract funds have been paid out, there is nothing left to lien. File as early as possible — ideally as soon as a payment dispute arises.

Step 3 — Effect of the Notice

Once a valid lien on public funds notice is served under 770 ILCS 60/23, several things happen:

• The public body must withhold the claimed amount from the prime contractor's payments.
• The funds are held for 90 days from the date of service, but the public body does not pay the lien claimant directly — that requires a court order.
• If multiple claimants file notices, all share the withheld funds pro rata. No claimant receives priority based on filing order.
• Officer liability: Any officer of the public body who disburses funds after receiving a valid notice is personally liable to the lien claimant for resulting damages (770 ILCS 60/23(d)). This personal liability provision gives the lien real teeth.

Step 4 — File Suit Within 90 Days

This is the most dangerous deadline in the entire process. If payment is not made within the 90-day window, you must:

• File a lawsuit in the circuit court of the county where the project is located, AND
• Serve a file-stamped copy of the complaint on the public body — all within the same 90-day period.

Failure to file suit within 90 days permanently terminates the lien. There is no extension, no grace period, and no second chance. The 90-day clock starts running on the date you serve the lien notice, so count carefully and calendar the deadline immediately.

IDOT Highway Projects: Special Considerations

While the lien on public funds applies to all Illinois public projects, IDOT highway construction has additional procedural layers worth understanding.

Prompt Payment Requirements

All subcontractors and suppliers on IDOT projects should be familiar with Article 109.11 of the IDOT Standard Specifications and the Illinois Prompt Payment Act (30 ILCS 540). These provisions require prime contractors to pay lower-tier subcontractors and vendors in a timely manner for both progress payments and final payments.

Service on IDOT

For IDOT projects, the lien on public funds notice must be served on the Secretary of Transportation. IDOT has offices in both Springfield and Chicago. Serve the notice on the office administering the contract. You must also serve the prime contractor and any intermediate subcontractor in the payment chain.

How IDOT Handles the Hold

Once IDOT receives a valid notice, it will withhold the claimed amount from the prime contractor's payments for 90 days. IDOT will not disburse those funds to anyone unless ordered to do so by a court. If you do not file suit and serve IDOT with a file-stamped complaint within the 90-day window, IDOT releases the hold and the funds are paid to the contractor.

Lien on Public Funds vs. Payment Bond Claim — How They Compare

Subcontractors and suppliers on Illinois public projects often have access to two separate remedies: the lien on public funds and the Illinois payment bond claim. They are different tools with different rules.

Statute: The lien on public funds is governed by 770 ILCS 60/23 (Illinois Mechanics Lien Act). The payment bond claim is governed by 30 ILCS 550 (Illinois Public Construction Bond Act).

Who can claim: Both remedies are available to subcontractors and material suppliers. General contractors with a direct contract with the public body typically cannot use the lien on public funds but may have direct rights under the bond.

Notice deadline: The lien on public funds has no fixed notice deadline — but the lien only attaches to undisbursed funds, so timing is critical. The payment bond claim must be served within 180 days of the claimant's last date of furnishing labor or materials.

Effect on public body payments: The lien on public funds stops disbursement of the claimed amount to the prime contractor. The bond claim does not stop public body payments.

Lawsuit deadline: The lien on public funds requires a lawsuit within 90 days of serving the notice. The bond claim allows suit at any time after the 180-day notice period, subject to general limitations.

Surety involved? No surety is involved in the lien on public funds — the claim is against the contract funds held by the public body. The bond claim is against the surety (bonding company) that issued the payment bond.

Pro rata sharing? Yes — all lien on public funds claimants share withheld funds pro rata. Bond claims are paid individually by the surety.

Many subcontractors and suppliers pursue both remedies simultaneously to maximize recovery. The two claims have different deadlines and different targets, so filing one does not preclude the other.

Common Mistakes That Kill Illinois Public Funds Lien Claims

Our firm regularly sees subcontractors and suppliers lose valid claims because of avoidable procedural errors. Here are the most common mistakes:

1. Waiting until after funds are fully disbursed. The lien on public funds only attaches to money the public body has not yet paid to the prime contractor. If you wait until the project is finished and all payments have been made, there may be nothing left to lien. File your notice as soon as a payment dispute arises — do not wait for the dispute to resolve on its own.

2. Serving only the prime contractor and not the public body. The notice must be served on both the public body's designated officer and the prime contractor. Serving only the contractor does not create a valid lien on public funds. The public body must receive the notice directly to trigger its obligation to withhold funds.

3. Filing an unnotarized notice. The statute requires a sworn statement. An unnotarized notice is defective and may not trigger the withholding obligation. Always have the notice notarized before service.

4. Failing to file suit within the 90-day window. This is the most common and most devastating mistake. The 90-day deadline is absolute. Once it passes, the lien expires permanently — even if the underlying debt is valid and undisputed. Calendar this deadline the moment you serve the notice.

5. Confusing the 90-day lawsuit deadline with the 180-day bond claim deadline. The lien on public funds and the payment bond claim have different deadlines. The 90-day deadline applies to the lawsuit after serving a lien on public funds notice. The 180-day deadline applies to serving notice of a bond claim. Mixing up these two deadlines can result in losing one or both remedies.

Frequently Asked Questions — Illinois Lien on Public Funds

What is an Illinois lien on public funds?

An Illinois lien on public funds is a statutory remedy under 770 ILCS 60/23 that allows subcontractors and material suppliers to claim money owed to the prime contractor by a public body. Because you cannot place a traditional mechanic lien on government property, the lien attaches to the contract funds instead. Once a valid notice is served, the public body must withhold the claimed amount from the prime contractor for 90 days.

Is there a deadline to file an Illinois lien on public funds?

There is no fixed statutory deadline to serve the initial notice. However, the lien only attaches to funds that have not yet been disbursed to the prime contractor. If all contract funds have already been paid out, there is nothing left to lien. File as early as possible. Once the notice is served, you must file a lawsuit within 90 days or the lien expires permanently.

What happens after I serve a lien on public funds notice in Illinois?

After receiving a valid notice, the public body must withhold the claimed amount from the prime contractor's payments. The funds are held for 90 days. The public body will not pay the lien claimant directly — that requires a court order. If multiple claimants file notices, all share the withheld funds pro rata.

Do I have to file a lawsuit to collect on an Illinois public funds lien?

Yes. Serving the notice alone is not enough. If payment is not made within 90 days of serving the notice, you must file a lawsuit in the circuit court of the county where the project is located and serve a file-stamped copy of the complaint on the public body — all within the same 90-day window. Missing this deadline permanently terminates the lien.

Can I file both a lien on public funds and a payment bond claim in Illinois?

Yes. The lien on public funds under 770 ILCS 60/23 and the payment bond claim under the Illinois Public Construction Bond Act (30 ILCS 550) are separate remedies with separate deadlines. Many subcontractors and suppliers pursue both simultaneously to maximize recovery.

Contact Emalfarb Law LLC

The 90-day lawsuit deadline is the single most dangerous deadline in Illinois public construction payment law. Once it passes, your lien on public funds claim is gone permanently — regardless of how much you are owed or how clear the debt is.

If you are a subcontractor or material supplier with an unpaid balance on any Illinois public project — whether a school, a municipal building, a county road, or a state highway — contact our firm immediately. Early engagement preserves the most options.

Call (847) 208-6513 or contact us for a free consultation to discuss your lien on public funds rights. You can also submit your information through our online intake form.

For a complete overview of remedies available on government contracts, visit our public project remedies hub. On private projects, Illinois mechanic lien rights provide contractors and suppliers with a powerful collection tool. Review the Illinois mechanic lien deadlines to understand the filing windows that apply to your situation.