Illinois has no minimum dollar threshold for prevailing wage coverage. The law applies to all public works projects regardless of contract value. Public bodies must obtain prevailing wage rates from the Illinois Department of Labor and include them in all bid specifications.
Illinois has an active prevailing wage law (Illinois Prevailing Wage Act (820 ILCS 130)). Administered by Illinois Department of Labor. Certified payroll is required. Federal Davis-Bacon applies to all federal projects.
Illinois enforces one of the most demanding prevailing wage regimes in the country through the Illinois Prevailing Wage Act (820 ILCS 130), administered by the Illinois Department of Labor. Critically for estimators, there is no minimum dollar threshold: every public works project is covered regardless of contract value. When you bid public work in Illinois, you must price labor to the Department's published prevailing rates for the project's county and trade, and you cannot assume a small job escapes coverage. Public bodies are required to include the rates in bid specifications and to post them at the job site.
Compliance carries real teeth. Underpayment penalties run 20% of the underpaid amount on a first offense and 50% on subsequent violations, with certified-payroll filing failures drawing up to $1,000 (first) and $2,000 (repeat). A 2025 law adds penalties specifically for failing to file certified payrolls on time, so timely electronic reporting is no longer optional housekeeping. Two violations within five years trigger a four-year debarment from public work.
When estimating, pull the current rate sheet for every classification you intend to use, include fringe benefits, and budget administrative hours for weekly certified payroll. The biggest pitfalls are misclassifying workers into lower-paid trades, omitting fringe obligations, and treating low-dollar jobs as exempt. Because debarment can remove you from the public market entirely, treat wage accuracy and payroll filing discipline as bid-protecting investments, not overhead to trim.
The federal Davis-Bacon Act applies to all federally funded or federally assisted construction contracts over $2,000 in Illinois. This includes projects funded by federal agencies, FHWA highway projects, HUD housing, and projects receiving federal grants.
First offense: penalty equal to 20% of total underpaid amount. Second and subsequent violations: 50% penalty. Certified payroll filing failures: up to $1,000 first offense, $2,000 for repeat offenses. Debarment for 4 years after two violations within 5 years. Discrimination penalty: $5,000 per violation.
Effective June 30, 2025 (SB1344): new civil penalties for failure to file certified payrolls — up to $1,000 first offense and $2,000 for repeat offenses within 5 years, plus individual liability.