Illinois prevailing wage and certified payroll
Illinois has a full state prevailing wage law with no dollar threshold. Every contractor and subcontractor on a covered job files certified payroll with the Illinois Department of Labor by the 15th of each month, and the 2026 county rates took effect July 15, 2026.
Yes, Illinois has its own prevailing wage law, and it reaches further than many contractors expect. The Prevailing Wage Act (820 ILCS 130) covers fixed works built by any public body or paid for in whole or in part with public funds, and the Illinois Department of Labor (IDOL) does not list a dollar threshold. Every contractor and subcontractor on a covered job pays the county rate for each trade and files certified payroll through the IDOL portal by the 15th of the month after the work. IDOL published the 2026 rates on July 15, 2026.
| Item | Illinois rule |
|---|---|
| State law | Yes. Prevailing Wage Act, 820 ILCS 130 |
| Agency | Illinois Department of Labor (IDOL), Wage Transparency and Construction Compliance Division |
| Covered work | Fixed works built by a public body or paid for in whole or in part with public funds, including bonds, grants, and loans. Maintenance work counts. |
| Dollar threshold | None stated by IDOL |
| Who sets rates | IDOL, by county and trade classification, after an annual survey in June |
| Current rate cycle | 2026 rates took effect July 15, 2026. Rates can change during the year. |
| Certified payroll | Certified Transcript of Payroll portal, monthly, by the 15th for the prior month |
| Record retention | 5 years from the date of last payment on the project |
| Underpayment penalty | Back wages, plus 20% of the underpayment to IDOL and 2% per month to workers (50% and 5% for a repeat violation) |
| Missed certified payroll | Up to $1,000 for a first violation, up to $2,000 for later ones (effective June 30, 2025) |
Which Illinois projects are covered
IDOL's FAQ defines covered projects as all fixed works constructed by any public body or paid for in whole or in part with public funds. The project does not have to be for public use. A private building that takes a state grant or public loan can be a public works project. Landscaping and other modifications to real estate are included, and construction under the Act includes maintenance work, so a repaving or roof repair contract is not exempt just because it is not new construction.
There are limits. IDOL says tax increment financing (TIF) funds do not qualify as public funds by themselves, so a TIF-assisted private project is covered only if it also takes money from a source that does qualify. Sales tax rebates also do not trigger coverage. In the other direction, Public Act 104-0023 added CCTV inspection of sewers to the definition of public works, effective June 30, 2025.
Time on the road can count too. IDOL treats driving equipment or materials to and from the site as hours worked when your own worker does the hauling. Delivery by a seller or supplier is not covered.
How Illinois rates are set and where to look them up
IDOL surveys wages each June and publishes county rates for every construction trade. The 2026 rates took effect Wednesday, July 15, 2026, and IDOL set an August 14, 2026 deadline for written objections, which go to an administrative law judge. The schedules are on the IDOL Current Prevailing Wage Rates page, sorted by county.
Do not print the July sheet and file it away. State guidance from the Department of Commerce and Economic Opportunity says rates can change monthly, and a revised rate applies to projects already underway (it is not retroactive). IDOL tells contractors to check rates before each pay period, because the contractor is responsible for increases that take effect during the job.
- Pick the county where the work is performed, not where your shop is.
- Classify by the work done, not the worker's usual title. Building and highway rates differ for the same trade.
- Base or foreman: each worker is paid at one or the other. IDOL suggests one foreman per job and at least one for every eight workers.
- Owners on the tools: a business owner who physically performs construction work must be classified and paid too.
- No benefit plan? Nonunion employers that do not provide fringe benefits add the cash value of the fringe to each hour worked.
Certified payroll through the IDOL portal
Illinois does not use a paper WH-347. Under 820 ILCS 130/5.1, contractors file certified payroll online through IDOL's Certified Transcript of Payroll portal. You need an Illinois Public ID account and log in by selecting Public Account. Filing is monthly, by the 15th day of the month after the work was performed, and state guidance recommends submitting each time you run payroll in the month. Since July 1, 2025 the portal takes an Excel upload template (the CTP Import file).
- File separately for each project, and use a separate login for each company.
- Enter a separate line for each classification and wage rate a worker had that period.
- Report gross and net wages, plus hours the worker spent on non-prevailing-wage jobs, which IDOL uses to check overtime.
- Report veteran status and race or ethnicity, which the Act requires.
- Mark whether the job uses state capital funds. IDOL says to assume any contract with a state agency does.
- Subs may file through the general contractor, but IDOL recommends each company file its own, since liability stays with each contractor.
After you file, the portal emails a PDF copy. The public body can ask for that copy or look up filings in IDOL's searchable database. One wrinkle: IDOL's FAQ says a contract that cites only Davis-Bacon does not require submission to the department, while a contract that says it is subject to the Illinois Prevailing Wage Act does.
Notice, posting, and records
The public body must tell contractors the Act applies, and contractors must pass written notice to every subcontractor they hire. If you skip that notice, the sub still owes prevailing wage to its crew, but the penalties land on you. Post the rates at the job site where workers regularly visit, or hand each worker a written notice of the project rates.
Keep records for at least five years from the date of last payment on the project: each worker's name, address, phone number, and Social Security number, classification, gross and net wages, hours worked each day, daily start and end times, hourly wage, overtime, and fringe rates, and the name, address, sponsor, and administrator of each fringe benefit fund. When IDOL asks, you have seven business days to make them available at a location inside Illinois, with a sworn statement that they are accurate.
Apprentices on Illinois jobs
Only workers enrolled in a U.S. Department of Labor certified apprenticeship program can be paid an apprentice rate. There is no pre-apprentice rate and no contractor-made subcategory. Public Act 104-017, effective June 30, 2025, put IDOL's long-standing position into law: an apprentice's fringe benefit package may not be lower than a journeyman's. For the federal side of this, see apprentice rules on prevailing wage projects.
Penalties and debarment
- Underpayment: the difference owed to workers, plus a penalty to IDOL of 20% of the underpayment and 2% of that amount per month to workers while it stays unpaid. A second or later violation raises those to 50% and 5%.
- No certified payroll: a Notice of Violation, and civil penalties of up to $1,000 for a first violation and up to $2,000 for later ones.
- Late or false certified payroll: filing late, or willfully filing a payroll that is false as to a material fact, is a Class A misdemeanor, with immediate debarment for four years and no right to a hearing on conviction.
- Missing records: failure to keep or produce records is a violation. Two Notices of Violation within five years can lead to debarment.
How Illinois differs from Davis-Bacon
| Rule | Illinois | Davis-Bacon |
|---|---|---|
| Trigger | Public body or public funds, no stated dollar floor | Federally funded or assisted contracts over $2,000 |
| Rates set by | IDOL, by county | U.S. Department of Labor wage determinations on SAM.gov |
| Payroll frequency | Monthly, by the 15th | Weekly |
| Where it goes | IDOL online portal | The federal agency, or the owner or sponsor that passes it on |
| Form | Portal entry or Excel upload | WH-347 or an equivalent with the same information |
Say a site work sub lands a $650,000 water main job for a village that mixes a state loan with federal money. The bid documents may carry a federal wage determination and the Illinois notice at the same time, which means weekly payrolls to the owner for Davis-Bacon and a monthly IDOL filing for the state. Read both contract clauses, and ask the public body which rate sheet governs each classification before you price labor. The guide to pricing prevailing wage jobs walks through the labor math.
Public work in Illinois also runs into the state's other rules: check the Illinois contractor license guide, Illinois mechanics lien rules, and Illinois prompt payment and retainage. Smart Business Automator prepares certified payroll data by job and classification and tracks which subs have filed for the month. See certified payroll automation.
Frequently asked questions
Is there a dollar threshold for prevailing wage in Illinois?
IDOL does not list one. The Act covers fixed works built by a public body or paid for in whole or in part with public funds, regardless of project size.
When is Illinois certified payroll due?
Monthly, by the 15th day of the month after the work was performed, through IDOL's Certified Transcript of Payroll portal. State guidance recommends filing each time you run payroll.
Where do I find Illinois prevailing wage rates?
On IDOL's Current Prevailing Wage Rates page, by county and trade. The 2026 rates took effect July 15, 2026, and rates can be revised during the year, so check before each pay period.
What is the penalty for not filing certified payroll in Illinois?
A Notice of Violation, plus civil penalties of up to $1,000 for a first violation and up to $2,000 for later ones under Public Act 104-0023. Willfully filing a false payroll is a Class A misdemeanor.
How long do I keep prevailing wage records in Illinois?
At least five years from the date of last payment on the project, available to IDOL within seven business days of a request at a location in Illinois.
Sources
- Illinois Department of Labor: Prevailing Wage Act
- Illinois Department of Labor: Prevailing Wage Act FAQ
- Illinois Department of Labor: Certified Transcript of Payroll
- Illinois Department of Labor: Certified Payroll FAQ
- Illinois Department of Labor: Current Prevailing Wage Rates
- Illinois Department of Labor: 2026 Prevailing Wage Rates Published (July 15, 2026)
- Illinois Department of Labor: 2025 Prevailing Wage Act Advisory
- Illinois DCEO: Prevailing Wage Guidance (April 3, 2026)
- U.S. Department of Labor: Davis-Bacon and Related Acts
Laws and rates change. Confirm current requirements with the state agency before you bid, file, or pay. This page is general information, not legal advice.