By Daniel Jahn, CPA — Contractor’s Ledger
If you do any work on public construction projects — schools, government buildings, infrastructure, publicly funded housing — you’ve likely encountered the term “certified payroll.” For many specialty trade contractors, certified payroll is one of the most confusing and time-consuming compliance requirements they face.
This guide explains what certified payroll is, who it applies to, what’s required, and how to stay compliant without it becoming a full-time job.
What Is Certified Payroll?
Certified payroll is a weekly payroll report submitted to the project owner (typically a government agency) certifying that you have paid your workers at least the prevailing wage rates for their classification on a public works project.
The “certified” part refers to the signed statement from the contractor or subcontractor certifying, under penalty of law, that the payroll records are accurate and that workers were paid correctly.
The standard federal form is WH-347, published by the U.S. Department of Labor. Many states have their own equivalent forms.
What Is Prevailing Wage?
Prevailing wage is the legally mandated minimum wage rate — including base pay and fringe benefits — for specific trade classifications on covered public works projects. These rates are determined by the U.S. Department of Labor (for federal Davis-Bacon projects) or by state labor agencies (for state prevailing wage projects).
Prevailing wage rates vary by:
- Trade classification (electrician, plumber, HVAC mechanic, ironworker, etc.)
- Geographic area (county or metropolitan area)
- Project type (building construction, heavy/highway, residential)
A journeyman electrician in one county might have a different prevailing wage rate than a journeyman electrician in the county next door. And rates are updated periodically, so you can’t assume last year’s rate still applies.
Which Projects Require Certified Payroll?
Federal Davis-Bacon Act
Any construction contract over $2,000 awarded by the federal government or involving federal funding requires Davis-Bacon compliance. This includes:
- Schools and universities receiving federal grants
- Hospitals with federally funded components
- Road and bridge projects using federal highway funds
- HUD-funded affordable housing
State Prevailing Wage Laws
Most states have their own prevailing wage laws that apply to state-funded public works projects. The thresholds, covered project types, and rates vary by state. Some states are stricter than federal Davis-Bacon; a few have repealed state prevailing wage laws entirely.
How to Know If Your Project Is Covered
The project specifications and contract documents will typically state whether the project is subject to prevailing wage. Your GC or project owner should also tell you at bid time. If you’re not sure — ask before you start.
What Certified Payroll Requires in Practice
For every pay period on a covered project, you must:
- Pay workers at or above prevailing wage rates for their classification and the hours worked on that project
- Track hours separately for each project — you can’t commingle hours worked on a prevailing wage job with hours worked on a private job
- Track fringe benefits paid — prevailing wage includes a total compensation rate (base pay + fringe). You can meet the fringe requirement through a bona fide benefit plan, by paying it in cash on top of base pay, or a combination
- Submit a certified payroll report (WH-347 or state equivalent) weekly for each week with work on the covered project
- Retain payroll records for at least three years after project completion (federal requirement; some states require longer)
Common Certified Payroll Mistakes
Misclassifying workers. Paying a journeyman electrician at a helpers’ rate is a serious violation. Classification must match the actual work being performed, not the worker’s formal title.
Using the wrong wage determination. Using outdated rates or the wrong geographic wage determination is a common error. Always verify the current rates for the specific county and project type before the project starts.
Failing to submit timely reports. Certified payroll reports are typically due weekly, often within a few days of the pay period end. Late submissions can result in penalties or payment withholds from the project owner.
Commingling project hours. If a worker splits time between a prevailing wage job and a private job in the same week, the prevailing wage hours must be tracked and reported separately.
Not accounting for fringe benefits correctly. If you’re using a benefit plan to satisfy the fringe component, the plan must be bona fide (IRS-approved). Cash fringe payments must show up in the payroll records.
Subcontractor oversight failures. As a prime or upper-tier sub, you may be responsible for ensuring your lower-tier subs are also complying with certified payroll requirements. Get their certified payroll reports and review them.
Certified Payroll for HVAC, Plumbing, and Electrical Contractors
Certified payroll is especially common for mechanical, electrical, plumbing (MEP) contractors because these trades are heavily represented on public construction projects. If you’re doing school HVAC retrofits, hospital piping, or municipal electrical work, you’re almost certainly dealing with prevailing wage.
The good news: once your payroll process is set up correctly, certified payroll adds minimal time per pay period. The key is getting the setup right — correct classifications, correct rates loaded into your payroll system, and a clear process for submitting reports.
How Contractor’s Ledger Handles Certified Payroll
We process certified payroll for specialty trade contractors as part of our full-service payroll offering. That includes:
- Identifying applicable wage determinations at project start
- Setting up correct worker classifications in your payroll system
- Tracking hours by project for each pay period
- Preparing and submitting WH-347 or state-equivalent reports weekly
- Tracking fringe benefit compliance (plan vs. cash fringe)
- Maintaining required payroll records for audit purposes
For contractors who are doing their first prevailing wage project, or who have been handling it themselves and want to get it right, we can review your current process and identify any compliance gaps.
See our contractor payroll services or get a free financial review.
Daniel Jahn is a licensed CPA and founder of Contractor’s Ledger, a construction accounting firm serving specialty trade contractors nationwide.
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