What a wage determination requires
The Davis-Bacon Act, 40 U.S.C. §3141 and following, requires contractors on federally funded construction contracts above $2,000 to pay laborers and mechanics no less than the locally prevailing wage for their classification. Related Acts extend the same obligation to most federally assisted construction, and many states apply parallel "little Davis-Bacon" laws to state-funded work.
A wage determination lists two figures per classification. The basic hourly rate must be paid in cash. The fringe rate is an additional obligation, expressed as an amount per hour worked, and 29 CFR Part 5 lets a contractor discharge it in three ways: by making contributions to bona fide benefit plans, by paying the amount in cash, or by any combination of the two.
That flexibility creates the arithmetic this calculator handles. Contributions to a health plan, a pension, an approved apprenticeship programme or a vacation fund count toward the fringe obligation at their hourly cost, annualised across all the hours the worker works, not just the hours on the covered contract. Cash paid above the basic hourly rate also counts. What does not count is a benefit the contractor is required by law to provide — the employer share of Social Security, workers' compensation premiums, unemployment insurance — because those are not fringe benefits within the meaning of the Act.
The formula, and the asymmetry that catches contractors out
The compliance test is not a comparison of totals. It is two tests applied in order.
First, the cash test. The cash rate paid must be at least the prevailing basic hourly rate. If it is not, the difference is owed in cash, and no amount of fringe benefit contribution cures it. A worker paid $28 an hour with $12 of benefits, against a determination of $30 basic plus $10 fringe, has received a package worth exactly the required $40 and is still owed $2 an hour — because the basic rate has to be paid in cash. This is the single most common misunderstanding on certified payroll.
Second, the fringe test. The fringe obligation is met by the benefits provided plus any cash paid above the basic rate. That credit runs one way only: extra cash counts toward fringe, extra fringe never counts toward cash. A worker paid $36 an hour with no benefits against the same determination has $6 of excess cash credited to the $10 fringe obligation, leaving $4 an hour outstanding.
Overtime is computed on the cash rate. Under the Contract Work Hours and Safety Standards Act, hours beyond 40 in a workweek carry a half-time premium, and under 29 CFR 5.32 that premium is computed on the basic hourly rate rather than on the base-plus-fringe package. Contributions to a bona fide plan are excluded from the regular rate; cash paid in lieu of fringe benefits is not excluded, so paying the fringe in cash raises the overtime premium. On a $30 base with a $6 cash-in-lieu payment, the premium is 0.5 × 36 × hours rather than 0.5 × 30 × hours — a real cost difference between two ways of satisfying the same obligation.
Worked example: a $30 + $10 determination with $4 of benefits and 8 hours of overtime
A carpenter's determination lists a $30.00 basic rate and a $10.00 fringe rate. The contractor pays $30.00 an hour in cash and contributes $4.00 an hour to a health plan. The week is 40 straight-time hours plus 8 hours of overtime.
- Required package. 30.00 + 10.00 = $40.00 an hour.
- Cash test. $30.00 paid against a $30.00 basic rate — met, with no excess to credit.
- Fringe test. 10.00 − 4.00 = $6.00 an hour outstanding.
- Cash to close the gap. 6.00 × 48 hours = $288.00 for the week.
- Overtime premium. Curing the fringe in cash makes the cash rate 30.00 + 6.00 = $36.00, so the premium is 0.5 × 36.00 × 8 = $144.00.
- Total due. 48 hours × 40.00 = 1,920.00, plus the $144.00 premium = $2,064.00.
Now compare two ways of curing the same shortfall. Paying the $6.00 in cash gives the overtime premium above, $144.00. Increasing the health plan contribution to $10.00 an hour instead leaves the cash rate at $30.00, so the premium is 0.5 × 30.00 × 8 = $120.00. The two routes deliver the worker the same $40.00 package, and the second costs the contractor 144.00 − 120.00 = $24.00 less on this week's overtime, because bona fide plan contributions stay out of the regular rate.
How to read the result
The shortfall per hour is the compliance answer. Anything above zero is a wage restitution figure, and it applies to every hour the worker spent in that classification on the covered contract. Multiply it by the hours across the whole job, not just the current payroll period, since an underpayment that ran for months accrues across all of them.
Compare required package and package provided only as a first look. Equal totals do not mean compliance, for the reason set out above: the basic rate must be in cash. Whenever the two totals match but a shortfall still shows, the cash test is what failed.
Getting the fringe figure right is the part that requires care. The hourly value of a benefit is its annual cost divided by the total hours the worker works in the year, including hours on private work. A contractor paying $500 a month for a health plan for a worker who works 2,000 hours a year is contributing 6,000 ÷ 2,000 = $3.00 an hour, not $500 divided by the hours on the federal job. Taking the credit against covered hours only — which produces a much larger apparent hourly rate — is a recurring finding in Wage and Hour investigations.
Note also what the shortfall exposes the contractor to beyond back wages. Davis-Bacon and the Related Acts allow withholding of contract funds to satisfy wage restitution, and a contractor found to have disregarded its obligations may be debarred from federal contracting for three years. Certified payroll submitted under 29 CFR 5.5 carries a statement of compliance, and falsifying it is a criminal matter.
Four ways to pay a $30 + $10 determination
| Cash base rate | Fringe provided | Total package | Shortfall per hour | Overtime premium per OT hour |
|---|---|---|---|---|
| $30.00 | $10.00 | $40.00 | $0.00 | $15.00 |
| $34.00 | $6.00 | $40.00 | $0.00 | $17.00 |
| $40.00 | $0.00 | $40.00 | $0.00 | $20.00 |
| $28.00 | $12.00 | $40.00 | $2.00 | $16.00 |
The first three comply; the fourth does not, because the cash rate is below the $30.00 basic rate and fringe benefits cannot be credited against it. The overtime premium column is half the cash rate actually paid, which rises as more of the package is delivered in cash. The fourth row assumes the $2.00 shortfall is cured in cash, so its cash rate is $30.00 plus $2.00.
Where certified payroll goes wrong
- Annualising fringe credits over covered hours only. The hourly credit is the annual benefit cost divided by all hours worked in the year, including private work.
- Crediting statutory obligations. The employer share of payroll taxes, workers' compensation and unemployment insurance are legally required and are not creditable fringe benefits.
- Using the wrong classification. The determination is by classification and the work actually performed controls. A worker who spends part of the day in a higher classification must be paid at that rate for those hours or have the split recorded.
- Computing overtime on the full package. The premium is half the cash rate, not half of base plus fringe contributions to a bona fide plan.
- Missing the apprentice ratio. Apprentices may be paid at a percentage of the journeyman rate only when registered in an approved programme and within the allowed ratio on site.
- Ignoring site-of-work and travel rules. Coverage attaches to work on the site of the work, and time spent travelling between covered sites during the workday is generally compensable.
Find the determination that actually applies
Wage determinations are issued by the U.S. Department of Labor by county and construction type — building, residential, highway, heavy — and the one that applies is the determination incorporated into the contract, not the current one on the website. It is locked in at bid or award and may be modified only in defined circumstances. Using the wrong construction type is a frequent error, because rates for the same classification differ materially between them.
State laws, related statutes and what else is owed
Federal Davis-Bacon is one of several regimes with the same structure. The McNamara-O'Hara Service Contract Act applies the same base-plus-fringe logic to service contracts, with a health and welfare rate rather than a locally determined fringe. Most states have their own prevailing wage laws for state-funded construction, often with lower dollar thresholds and their own determination systems, and where both apply the higher obligation governs. Public works work also carries apprenticeship, ratio and reporting obligations that no wage calculation captures.
A prevailing wage shortfall is not the only wage claim available on the same facts. If the overtime premium itself was computed wrongly, or if hours were worked off the clock, that is a Fair Labor Standards Act claim with its own doubling and its own limitation period — the unpaid overtime back pay calculator values it. If a worker was dismissed after raising the underpayment, the retaliation claim has its own damages framework, handled by the wrongful termination damages calculator. And where a settlement of any of these claims is offered alongside a separation, value the whole package with the severance package evaluation calculator rather than looking at the wage figure alone.
For the contractor, the practical discipline is documentation. Keep the determination that was incorporated into the contract, the annualisation calculation behind every fringe credit, and the classification basis for every worker. Those three documents answer most of what an investigation asks.
Key terms
- Wage determination
- The Department of Labor's schedule of prevailing basic hourly rates and fringe rates for each classification in a county and construction type.
- Bona fide fringe benefit
- A benefit provided under a plan or programme — health, pension, vacation, approved apprenticeship — that is creditable against the fringe obligation. Legally required contributions are not creditable.
- Cash in lieu
- Payment of the fringe obligation, in whole or part, as cash wages. It counts toward the fringe requirement and also raises the regular rate for overtime.
- Annualisation
- Dividing the annual cost of a benefit by the worker's total annual hours to derive the creditable hourly rate.