PREVAILING WAGE, MASTER GUIDE

DAVIS-BACON JOB COSTING WITHOUT THE MARGIN LOSS.

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Davis-Bacon and state prevailing wage work breaks the job costing most subcontractors run. The wage determination sets a labor floor by classification. Fringe benefits become a real accounting decision, since paying cash or crediting bona fide plans moves your burden 10 to 20 percent. Worker classification drives compliance and cost at the same time. And certified payroll publishes your labor data to the agency every week, which means the measurement already exists whether or not you use it.

The core problem is that subs bidding prevailing wage work off private-work burden rates either lose the bid or win it unprofitably. Both outcomes come out of the same input error. The fix is building burdened rates from the actual wage determination, deciding the fringe strategy before bid day rather than discovering it at the first certified payroll report, and running one weekly labor record that feeds certified payroll and job costs together. SPM doesn't process payroll and doesn't produce the WH-347. It builds the costing structure around whoever does.

BY JOSH LUEBKERPublished 2026-08-06Updated 2026-08-07
THE DEFINITION

WHAT IT MEANS.

A wage determination is the document attached to every Davis-Bacon contract listing the base hourly rates and fringe amounts by worker classification for the county the work is in.

Public work isn't harder to make money on. It's harder to price wrong twice, because the wage floor applies to every bidder in the room. Once labor cost stops being the competitive variable, the competition moves to productivity, burden math, and overhead efficiency, and a sub with a real burdened rate table per classification is bidding against people guessing.

THE MECHANICS

WHERE DAVIS-BACON BREAKS NORMAL JOB COSTING.

01

The wage determination sets your cost floor, whatever your payroll history says

Every Davis-Bacon contract includes a wage determination listing base hourly rates and fringe amounts by classification, and that document is the cost foundation for bidding rather than your private-work payroll history. The discipline is pulling the determination for the specific county, building a burdened rate per classification covering base plus fringe plus taxes computed correctly plus comp plus real labor overhead, and refreshing rates when modifications publish. Bidding prevailing wage work off blended private rates is how subcontractors win jobs that were already lost at estimate.

02

The fringe decision moves your burden 10 to 20 percent

The fringe portion can be paid as cash wages or credited through bona fide benefit plans, and the choice carries real cost consequences. Fringes paid as cash inflate the base for payroll taxes and often workers' comp, while plan contributions generally don't. On a $15 an hour fringe across a 20 person prevailing wage crew, the difference runs six figures annually. That decision belongs in the CFO function before bid day rather than showing in the first certified payroll report.

03

Classification and site-of-work rules decide the rate and the cost together

Worker classification on prevailing wage jobs sets the legal rate and your job cost at the same time. A laborer performing operator work owes operator rates, split-classification workers need hour by hour tracking, and site-of-work rules decide whether yard and haul time is covered. Misclassification produces back-wage findings, withheld contract payments, and debarment exposure, and it also means your job costs were wrong the whole time. One tracking discipline solves both problems: daily time by worker, classification, and cost code, entered once.

04

Certified payroll gets treated as overhead instead of a costing asset

Certified payroll is usually treated as pure compliance cost, but the weekly WH-347 carries the data per-job labor costing needs: hours by worker by classification at known burdened rates. Structured correctly, the same weekly record feeds the certified report and the job cost ledger, so prevailing wage jobs get sharper weekly labor tracking than most subs run on private work. Compliance stops being a tax and becomes the measurement system.

THE ARITHMETIC

WHAT IT LOOKS LIKE IN DOLLARS.

10 to 20 percent

That's the burden swing the fringe decision controls. Cash-paid fringes inflate the payroll tax and comp base while bona fide plan contributions generally don't. Deciding the fringe strategy deliberately before the bid is routinely worth five to six figures a year to a sub running regular prevailing wage crews, and most subs don't know they're making the decision at all.

Weekly

Labor variance visibility on every prevailing wage job. Because certified payroll forces a weekly labor record anyway, prevailing wage jobs run the tightest labor tracking in the company once costing is integrated: estimate against actual by classification, every week. Overruns get caught at week two with time to respond, which is the discipline that kills profit fade.

By the 10th

Prevailing wage books close inside the same monthly rhythm as everything else: monthly close by the 10th, WIP on every job, and public-work float modeled in the 13 week forecast. Compliance-heavy work doesn't get a slower close. It gets a sharper one.

THE STRUCTURE

THE PREVAILING WAGE COSTING CHECKLIST.

The checklist SPM installs

The structure starts with a burdened rate table per classification per active determination, refreshed whenever a modification publishes. The fringe strategy gets decided and documented before bid day, whether that's cash, plans, or a split. Daily time gets captured by worker, classification, and cost code, entered once and feeding both payroll and job costs. Prevailing wage jobs get costed and reported separately from private work, because blended books hide the real prevailing wage margin. Weekly labor-to-estimate variance runs per classification, so overruns get caught at week two and not at closeout. And retainage, agency pay cycles, and stored-material rules all go into the 13 week cash forecast, because public work floats long.

One boundary worth stating

SPM doesn't process payroll and doesn't produce certified payroll reports. That work stays with your payroll provider, and the good ones do it well. What SPM builds is the costing structure around it: the rates, the fringe strategy, the job cost integration, and the margin visibility that makes prevailing wage work worth winning in the first place.

Prevailing wage, trade by trade

Civil, sitework, and DOT carry the heaviest prevailing wage exposure in the field, where federal-aid highway, water, and infrastructure work put operator classifications, trucking and site-of-work rules, and long agency pay cycles in the same job, and civil subs who master the burden math own a segment most competitors price wrong in both directions. Electrical on federal work, meaning data centers on federal property, military bases, and VA projects, carries some of the highest fringe components on the books, which makes the cash versus plans decision worth the most, and apprentice ratio compliance adds a layer where the legal limit and the cost optimum are the same number. Concrete on public structures like bridges, treatment plants, and schools mixes laborer, finisher, and operator classifications on the same pour, so split-classification time tracking is the difference between a clean audit and a withheld payment, and inspection-gated billing stretches the cash cycle past private-work norms. Erosion control on municipal work rides the prime's Davis-Bacon obligations downstream, and multi-site municipal portfolios mean several determinations running at once, so per site costing and per determination rate tables keep forty small sites from becoming forty small compliance exposures.

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PRICING

FLAT MONTHLY FEE. NO SURPRISES.

Three tiers, priced by your trailing twelve month revenue. Which one you're in depends on how much of the work you want off your desk. No hourly billing, no payroll, and no add-ons.

Last 12 months revenueMonthly fee
Up to $1M$1,900 to $2,900
$1M to $3.5M$2,600 to $3,900
$3.5M to $6.5M$3,800 to $5,700
$6.5M to $9.5M$5,100 to $7,100
$9.5M to $12.5M$6,100 to $8,500
$12.5M to $15.5M$7,400 to $11,000
$15.5M to $18.5M$9,400 to $13,500
$18.5M+Quoted individually

Range reflects the three tiers below. Which one you're in depends on how much of the work you want off your desk. No payroll. No hidden line items.

Core

You stop guessing.

You get the CFO work. Job costing built against the way you estimate, a 13 week cash forecast, monthly WIP, and a meeting every month that ends in decisions rather than a report.

Your bookkeeper keeps doing the books.

Executive

You stop touching the books.

Everything in Core, and we run the bookkeeping and the controllership as well. Nobody in your office is answering coding questions or chasing a reconciliation at month end.

We do the books. No payroll.

Strategic

Every job shows its margin while it's still running.

Everything in Executive, plus the job costing and WIP platform set up, loaded with your cost codes, and managed for you every month. You never have to learn it.

We do the job costing.

COMMON QUESTIONS

FREQUENTLY ASKED.

If the prime contract is federal or federally assisted construction over $2,000, Davis-Bacon flows down to every tier of subcontractor on the site. There's no small-sub exemption, and we didn't know has never survived an audit. Many states layer their own prevailing wage laws on state-funded work with different thresholds and determinations. The practical rule is that the bid documents and your subcontract will state the prevailing wage obligation and attach the determination, so read for it on every public or institutional bid and price from the determination and not from assumption.
Run the math both ways before deciding, because the difference is real money. Paying fringes as additional cash wages is administratively simple but inflates the base your payroll taxes, and often your workers' comp, compute on. Crediting bona fide benefit plans across health, retirement, and approved apprenticeship generally avoids that inflation, worth roughly 10 to 20 percent of the fringe amount, but it requires legitimate plans and clean documentation. Regular prevailing wage volume usually justifies the plan route, and occasional prevailing wage jobs often don't. It's a numbers decision, so make it with the numbers and document whichever answer you choose.
Build one daily time record that feeds both, capturing worker, hours, classification, and cost code once in the field. Payroll uses it to produce the certified report and job costing uses the identical data for weekly labor-to-estimate variance. When the two systems share a source they reconcile by construction, and the compliance work doubles as your best labor measurement. When they're separate, with foreman texts for payroll and monthly guesses for job costs, you pay for the work twice and trust neither number. SPM structures the single-source flow and your payroll provider keeps producing the WH-347s.
It's frequently more profitable than private work, for subs with the costing structure to price it right. The wage floor applies to every bidder, so labor cost stops being the competitive variable and the competition moves to productivity, burden math, and overhead efficiency, which is where well-run subs win. Prevailing wage work also brings public-sector payment protections like payment bonds and prompt-pay statutes that private work lacks. The subs who lose money on prevailing wage are the ones pricing off wrong burden rates or absorbing classification errors. The math is demanding. It's not unfavorable.
No. SPM doesn't process payroll or produce certified payroll reports, and that stays with your payroll provider, where the good ones do it well. What SPM builds is everything around it: burdened rate tables per classification, the fringe strategy decision, the single-source time structure that feeds payroll and job costs together, separate prevailing wage job reporting, and the cash forecast that models public-work float. Compliance executes at the payroll desk. Profitability gets decided in the costing structure, and that's the part SPM owns.
WHAT THIS TIES INTO
Josh Luebker, The Construction CFO
Josh Luebker
FRACTIONAL CFO · THE CONSTRUCTION CFO

Former commercial project manager and master electrician: 150+ projects worth $2.1B combined, from $50,000 to $300M. Now fractional CFO to commercial subcontractors.

ARE YOUR PREVAILING WAGE JOBS PRICED OFF THE DETERMINATION OR OFF MEMORY?

Bring one active determination and the bid you built against it. We will rebuild the burdened rate per classification on the call and show you what the fringe decision is worth to you.

You don't hire a CFO because it's safe, you do it because the real risk isn't having one.
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