Prevailing Wage Fringe Benefit Credit Calculator

What is the annualization rule for Davis-Bacon fringe benefits?

Annualization is the rule that decides how big your fringe benefit credit actually is. It says you divide the annual cost of a benefit by every hour the worker worked that year — Davis-Bacon hours and private hours together — not just the hours on the federal job.

Here is why it exists. Health insurance covers a worker in March whether he spent March on a federal courthouse or a private warehouse. If you could divide the premium by federal hours alone, the federal project would be paying for coverage that the private work also enjoys. So 29 CFR 5.25(c) makes you spread the cost across the whole year.

The arithmetic is unforgiving. Take the calculator's defaults: $13,180 in annual benefit cost per worker, 1,300 Davis-Bacon hours, 700 private hours. Divide by 1,300 and you get $10.14 an hour. Divide by 2,000 and you get $6.59. Same benefits, same worker, a $3.55 swing.

There is one narrow exception. Contributions to a defined contribution pension plan escape annualization if the plan provides immediate participation and essentially immediate vesting — the benefit vests within the first 500 hours worked — and the plan also satisfies every criterion in 29 CFR 5.25(c)(3). The calculator has a toggle for the vesting test. It cannot judge the (c)(3) criteria for you, and neither should you assume they are met. Any other exception requires a written request to the Wage and Hour Division Administrator.

How do I calculate the hourly fringe benefit credit for certified payroll?

Four steps, and you do them separately for every worker, because enrollment and hours differ from one person to the next.

1. Add up what you actually spend. Employer share only. Using the defaults: $7,800 health, $2,600 retirement, $1,600 vacation and holiday, $480 apprenticeship training, $300 life and disability, $400 in third-party plan administration fees. That's $13,180.
2. Throw out what isn't creditable. The $900 you spend on your own staff tracking invoices and filling out claim forms doesn't count. Neither does FICA, unemployment, or workers' comp — those are statutory obligations, not fringe benefits, and trying to credit them is a classic audit finding.
3. Divide by all hours worked. $13,180 ÷ 2,000 hours = $6.59 per hour.
4. Compare to the determination and pay the difference in cash. The determination requires $9.75. You have $6.59. You owe $3.16 per hour in cash fringe, which lands in the Fringe Benefits Paid column of your WH-347. Straight-time cash rate becomes $37.66. Overtime is $34.50 × 1.5 + $3.16 = $54.91, because the fringe portion stays at straight time on overtime hours.

Notice what happens with the shortcut. Divide $13,180 by 1,300 covered hours instead and you get $10.14, which clears the $9.75 requirement by thirty-nine cents. You'd pay zero cash fringe and think you were compliant. Across twelve workers that mistake is $49,296 a year in back wages before any penalty.

How much do contractors save by paying fringe in benefits instead of cash?

Roughly three to five percent of covered labor cost, and the calculator's defaults land at 2.96% — right at the bottom of that band, with room to improve.

The mechanism is simple. Cash wages carry payroll burden. Bona fide fringe benefit contributions don't. Every dollar you shift from the paycheck into a qualifying benefit plan skips FICA, federal and state unemployment, workers' compensation, and the payroll-rated slice of general liability.

At the defaults that burden is 26.25% — 7.65% FICA, 2.6% unemployment, 14.8% workers' comp, 1.2% general liability. Workers' comp is doing most of the work there, which is why the savings are largest for the trades with the ugliest class codes.

Run it: $6.59 of credited fringe × 26.25% = $1.73 saved per hour. Multiply by 1,300 covered hours and 12 workers and you save $26,986 a year against a fully-cash payroll of $910,704.

Now close the gap. You're still paying $3.16 an hour as cash fringe. Fund that through the plan instead and you pick up another $12,940, taking total savings to $39,926 — about 4.4%.

Two cautions. Workers' comp rates vary enormously by class code and state, so plug in your own experience-rated number rather than trusting a default. And the savings only exist if the plan is genuinely bona fide and funded at least quarterly. A plan that fails those tests generates zero credit and full back-wage liability, which costs far more than the burden you were trying to avoid.

Which costs count as creditable fringe benefits and which don't?

The line is narrower than most contractors assume, and 29 CFR 5.33 redrew part of it in 2023.

Creditable: premiums paid to an insurance carrier, contributions to a third-party trust fund, contributions to a registered apprenticeship program, vacation and holiday costs, life and disability premiums. Also creditable — and this surprises people — the administrative costs your carrier, trust fund, or third-party administrator incurs in actually administering and delivering the benefits: evaluating claims, deciding whether to pay them, approving specialist referrals.

Not creditable: your own administrative expenses. Office staff filling out insurance claim forms, tracking carrier invoices, updating personnel records, mailing tax documents. These are ordinary business overhead. Critically, the exclusion follows the task, not the vendor — paying an outside firm to do those same clerical jobs doesn't convert them into creditable costs. The calculator keeps these in a separate input and shows them as an excluded per-hour figure so you can see what you're leaving on the table.

Never creditable: FICA, unemployment insurance, and workers' compensation. They're statutory. They can't offset a fringe obligation.

Timing matters too. Contributions must be made regularly and not less often than quarterly. Annual contributions into a plan fund don't satisfy the requirement, and for unfunded plans you generally have to set aside the equivalent amount at least quarterly. The calculator flags this because it's a cheap mistake with expensive consequences — the whole credit disappears.

When a specific cost is genuinely ambiguous, the honest answer is to ask the Administrator before claiming it, not after.

What is the difference between the basic hourly rate and the fringe rate?

Every Davis-Bacon wage determination lists two numbers for each classification: a basic hourly rate and a fringe rate. In the calculator's defaults, $34.50 and $9.75. Together they are your $44.25 straight-time obligation.

The useful part is that for straight time, the split is flexible. Under 29 CFR 5.31 you can meet the obligation with cash, with bona fide benefits, or with any combination — the regulation's own example runs a $21.93 base plus $6.27 fringe as a combined $28.60 that may be satisfied "partly in cash and partly in payments or costs for fringe benefits." So if your benefit credit exceeds the fringe rate, the excess can reduce the cash you owe below the basic hourly rate. The calculator shows any excess credit as its own line.

Overtime is where the flexibility stops. 29 CFR 5.32(a) is explicit: the regular rate used to compute the overtime premium can never fall below the basic hourly rate on the determination. The regulation's example makes it concrete — a contractor who drops the cash wage from $3.00 to $2.75 while claiming $1.00 in benefit costs still computes overtime on $3.00. The calculator floors the overtime premium base at $34.50 for exactly this reason.

The other overtime rule: fringe is excluded from the half-time premium. You pay time-and-a-half on the base, straight time on the fringe. Hence $54.91 rather than $56.49.

One state warning. Some jurisdictions require the premium on certain fringes — New Jersey among them — and some western states treat training funds differently from the federal rules. Confirm your state before relying on the federal answer.