Certified Payroll and Davis-Bacon, Explained for Small Contractors

Updated 2026-10

Why this matters to a small contractor

Public work pays reliably and the reporting around it is unforgiving. A contractor who wins a first federally funded job often discovers certified payroll the week the prime asks for it. This guide exists because the question comes up constantly and the answer is rarely explained in plain terms. If prevailing-wage work is part of your business, say so in the request so the payroll setup is planned around it from the start.

What certified payroll is

A weekly report, submitted to the contracting agency or prime contractor, listing every worker on a covered project: name, classification, hours by day, rate, gross wages, deductions and net pay, with a signed statement of compliance. The federal form is WH-347. Many states have their own forms and portals for their own prevailing-wage work. "Certified" refers to that signed statement: the person signing certifies that the workers were paid at least the prevailing wage for their classification.

When Davis-Bacon applies

The Davis-Bacon Act covers federal and federally assisted construction contracts above $2,000. Related acts extend it to many projects with federal funding flowing through states and localities: highways, housing, water systems, schools. If a project is covered, the wage determination for that locality sets a minimum hourly rate and fringe benefit amount for each trade classification, and every contractor and sub on the job must pay at least that and report weekly.

State prevailing wage

Roughly half the states have their own prevailing-wage laws for state and local public works, sometimes called little Davis-Bacon acts, with their own thresholds, wage schedules and reporting. Some apply to projects far smaller than the federal threshold; some have been repealed; some change. A contractor bidding public work needs to know the rule for the state and the agency, and the agency’s bid documents usually say.

Fringe benefits and the cash alternative

The wage determination has two parts: a base rate and a fringe amount. The fringe can be paid into bona fide benefit plans or paid as additional cash wages. Paying it as cash raises the payroll tax and workers’ comp burden on it, which is why contractors doing a lot of prevailing-wage work often set up benefit plans. The calculation per worker per hour, by classification, is where certified payroll gets complicated and where specialists earn their fee.

Apprentices, classifications and splits

Apprentices may be paid at a percentage of the journey rate only if enrolled in a registered program, at the ratios the program allows. A worker who does two classifications in a day is reported at each rate for the hours in each. Misclassifying a laborer as a lower-rate trade, or paying apprentice rates to someone not registered, are the most common findings in a Davis-Bacon audit.

What getting it wrong costs

Back wages to the workers, which the agency can withhold from your contract payments, plus liquidated damages on some contracts, and for serious or repeated violations, debarment from federal work for up to three years. Prime contractors are responsible for their subs’ compliance, which is why a GC on public work will ask for your certified payrolls weekly and refuse to pay without them.

How it fits with ordinary bookkeeping

Certified payroll is a reporting layer on top of payroll, not a different set of books. The hours, classifications and rates it reports are the same hours that should be posted to the job at the burdened rate in the accounting file. A sensible arrangement for a small contractor with some public work is a specialist provider running the certified payroll for covered projects, with the bookkeeping firm reconciling it into the books and costing the labour to the jobs. The two providers need to talk to each other once, at setup, and then it runs.

Where to go next

• Construction payroll services (standard, multi-state)
• 1099 subs or W-2 crew
• Bookkeeping for general contractors