Illinois certified payroll upload files (IDOL)
Build the import file for IDOL's Certified Transcript of Payroll portal from your payroll data, one project per file. A person signs in, uploads, attaches the fringe document, and certifies.
A PayrollStart 03/01/2026B PayrollEnd 03/07/2026D ProjectNumber Sample 01AQ Last4SSN 0000AT WorkClassification CarpenterAU GeographicDivision ALLAV ClassType BLDBE Race (blank)BH IsaVeteran 0BR WednsdayPrevailingHoursWorked 8BX SatdayPrevailingHoursWorked 0CX NoWorktoReport 0
Wednsday and Satday are IDOL's own header spellings.
| Check | Result |
|---|---|
| Projects in file | 1 project |
| Headers | 102 of 102 |
| Race, veteran | 1 blank |
| ClassType | Valid |
| Fringe document | Person attaches |
ClassType options: ALL, BLD, FLT, HWY, O&C, RIV.
How it runs.
Illinois wants certified payroll filed by the 15th of the next month, by project. IDOL's template has 102 columns, and prior-month payrolls cannot be withdrawn after the 15th.
Payroll by project
Daily hours, rates, fringe amounts and worker details for each project.
Your dataBuild the import
IDOL's template columns, then checks for blanks, classifications and hour totals.
AutomatedA person uploads, certifies
Staff use the company's Illinois Public ID, attach the fringe document, and certify.
A personCTP number saved
Staff save the CTP number beside the file and project.
Automated
IDOL Certified Transcript of Payroll portal / Illinois Public ID / Full-CTP-Upload template / Fringe Benefit Affidavit / Payroll system export
The rules and limits.
- CSV or Excel
- IDOL posts an Excel template. Its 2026 training says Full Import needs a CSV that follows the template's column names. Test one real file before relying on either.
- One project, one company
- Payroll goes in by individual project, never several in one file. Two companies need separate logins, each through an Illinois Public ID account.
- Template columns
- Full-CTP-Upload has 102 columns for use from July 1, 2025, including GeographicDivision, ClassType, ClassCode, HourlyOtherInsurance, AddOT15 and AddOT20.
- The 15th
- File in IDOL's database by the 15th of the following month. After the 15th, prior-month payrolls cannot be withdrawn. Keep supporting records 5 years.
- Worker data
- Race, ethnicity and veteran fields are in the template. If you do not know them, IDOL says to ask your employees, because the Act requires the information.
What a person does.
- Sign in with the company's own Illinois Public ID and upload.
- Attach the fringe benefit document unless it is a No Work Report.
- Check the Review Page, then type your name to certify.
- Request any withdrawal before the 15th cutoff.
Where we stand: we have not shipped this. Your staff upload each file and certify it under your company's login. We would not sign in.
Common questions.
Does IDOL want CSV or Excel?+
Its posted template is an Excel file and its FAQ says Excel template. Its 2026 training slides say Full Import requires a CSV. We would build to the template's columns and test one real file first.
Can someone else file for our company?+
IDOL's FAQ says each company needs its own login and recommends every contractor file its own payroll, because liability stays with that contractor. It does not address outside payroll firms. Ask IDOL.
Does this make us compliant?+
No. It prepares a file in IDOL's format. Rates, classifications and the certification stay with you, and you remain responsible for what you certify.
Sources
- IDOL Certified Transcript of Payroll page
- IDOL certified payroll FAQ
- IDOL Excel template, for use from July 1, 2025
- IDOL 2026 training slides
General information, not legal, tax, or compliance advice. Rules change; confirm against the current source and your own advisers.
Bring us your version of this.
Intro calls are 30 minutes, free, and useful even if we never work together. We'll be honest about whether this is the right fit for your construction team.