Illinois Certified Transcript of Payroll

How to file certified payroll in Illinois (IDOL Certified Transcript of Payroll)

Illinois contractors on public-works projects file a monthly Certified Transcript of Payroll (CTP) with the Illinois Department of Labor (IDOL), uploaded to the CTP portal as an Excel workbook (.xlsx, IDOL’s template) with a signed affidavit. Since SB1344 strengthened the Prevailing Wage Act (820 ILCS 130), a late or missing monthly filing is treated severely — so the deadline, not the format, is what trips contractors up. PayrollPenguin turns your payroll run into a CTP-ready Excel upload (.xlsx) + affidavit, splits prevailing vs non-prevailing hours per day, and flags anomalies before you certify.

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SB1344 raised the stakes on the monthly deadline

Under the amended Illinois Prevailing Wage Act, each month a certified transcript is not filed can be treated as a separate violation, and responsible individuals — not just the company — can face liability and debarment from public work. That makes the recurring monthly cadence the real risk. PayrollPenguin tracks each project’s filing deadline and reminds you before it lands, so a busy month does not become a separate offense.

Prevailing vs non-prevailing hours, split per day

The CTP reports each worker’s hours split between prevailing-wage (PW) work on the covered project and non-prevailing (N) work, day by day. PayrollPenguin reshapes your weekly straight-time and overtime totals into the per-day PW and N cells deterministically — it reformats your own hours and never invents time worked.

Fringe buckets, the F flag, and annualization

Illinois CTP fringe is reported in named buckets (pension, health/welfare, vacation, training). A jointly-managed LMRA fund carries the “F” flag and is a bona-fide fund; a non-fund plan must be annualized across all hours worked before it can be credited (29 CFR 5.25). PayrollPenguin carries the F flag through and flags — never silently applies — an annualization difference for your review.

Federal Davis-Bacon projects are exempt

A project covered by the federal Davis-Bacon Act is exempt from the Illinois CTP requirement. PayrollPenguin surfaces this as guidance when a project is also marked federal — it flags it for you to decide, and never silently blocks or auto-routes the filing.

How to file Illinois certified payroll

  1. Import your payroll run. Upload your ADP, Gusto, QuickBooks, Paychex, or CSV payroll for the month.
  2. Pick the Illinois project. Select the public-works project and public body so the CTP is bound correctly.
  3. Review PW/N split and fringe. PayrollPenguin splits prevailing vs non-prevailing hours and flags annualization or a Davis-Bacon exemption.
  4. Certify and export the CTP + affidavit. Sign the affidavit, then download the CTP Excel file (.xlsx) and affidavit PDF to upload to IDOL.

Frequently asked questions

What happens if I miss an Illinois CTP month?
Under SB1344’s strengthened Prevailing Wage Act, each unfiled month can be a separate violation, with individual liability and possible debarment. PayrollPenguin reminds you of each project’s monthly deadline so a missed filing does not compound.
Does the Illinois CTP need the full SSN?
No. The Illinois CTP uses the last four digits of the SSN only — lighter than California or Washington, which require the full number. PayrollPenguin never places a full SSN in the CTP file.
Is PayrollPenguin a compliance guarantee?
No. PayrollPenguin is a reporting and formatting tool — it formats your payroll to the IDOL CTP specification and flags anomalies. You certify the affidavit and IDOL reviews.

File Illinois certified payroll in minutes

Turn your existing payroll run into a file-ready Illinois Certified Transcript of Payroll filing — anomalies flagged, nothing invented.

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PayrollPenguin is a reporting and formatting tool, not a compliance guarantor or legal advisor. You certify your filings; the awarding agency reviews them.