WeeklyCertified / State rules / Certified Payroll in Illinois: The Certified Transcript of Payroll Portal
Certified Payroll in Illinois: The Certified Transcript of Payroll Portal
What are the certified payroll rules in Illinois?
Illinois requires a monthly Certified Transcript of Payroll on covered public works, with no dollar threshold, filed electronically in the Illinois Department of Labor's portal by the 15th of the following month. Records are kept five years. A federal WH-347 alone does not satisfy the Illinois requirement.
Illinois moved certified payroll into a single statewide database: the Certified Transcript of Payroll portal. Once you have an Illinois Public ID account, the monthly rhythm is upload by the 15th, every month, for the life of the project.
The rules at a glance
| State law | Illinois Prevailing Wage Act, 820 ILCS 130 |
| Threshold | None; the Act applies to covered public works regardless of contract amount |
| Form / format | Certified Transcript of Payroll (CTP), filed electronically (Excel upload template provided) |
| Where it goes | IDOL Certified Transcript of Payroll portal (link) |
| How often | Monthly, no later than the 15th of each month for the preceding month |
| Records kept | 5 years |
| Who administers it | Illinois Department of Labor |
Does the federal WH-347 work in Illinois?
No. Filings must go through IDOL's portal once the database is active, so a WH-347 does not satisfy the Illinois requirement. WH-347 still applies to federally funded projects.
Penalties
A 20 percent penalty on underpayments (50 percent for repeats) plus 2 percent per month punitive damages to workers, four-year debarment after two violations in five years, and willful false filing is a Class A misdemeanor.
Federal jobs in Illinois still mean WH-347
State rules govern state-funded work. The moment a project is federally funded or assisted, the Davis-Bacon and Related Acts apply and the weekly WH-347 with its Statement of Compliance is the filing, regardless of what Illinois requires on its own jobs. Many contractors run both systems side by side on different projects, which is exactly why knowing which regime a given contract sits under is week-zero work (see the first-job checklist).
The free WeeklyCertified generator prepares the federal form with your wage determination's rates pulled live and the fringe and overtime math done to the cent.
Questions
Does the federal WH-347 satisfy Illinois requirements?
No. Filings must go through IDOL's portal once the database is active, so a WH-347 does not satisfy the Illinois requirement. WH-347 still applies to federally funded projects.
How often is certified payroll due in Illinois?
Monthly, no later than the 15th of each month for the preceding month. Records: kept 5 years.
Who enforces prevailing wage in Illinois?
Illinois Department of Labor. A 20 percent penalty on underpayments (50 percent for repeats) plus 2 percent per month punitive damages to workers, four-year debarment after two violations in five years, and willful false filing is a Class A misdemeanor.