Prevailing Wage Fringe Benefit Calculator

How the Davis-Bacon fringe credit is actually calculated

A prevailing wage is two numbers, not one. The wage determination for your county and classification lists a basic hourly rate in the "Rates" column and a fringe benefit rate in the "Fringes" column. You pull both from the applicable determination on SAM.gov, and together they form the minimum package you owe for every hour worked on the covered job.

The fringe half is where certified payroll goes wrong. You do not get to credit the sticker price of a benefit plan; you get to credit an hourly equivalent, and 29 CFR 5.25(c)(1) is specific about how to derive it: divide the total cost of the contribution (or the reasonably anticipated cost of an unfunded plan) by the total number of hours worked on both private work and covered work during the period the cost is attributable to. That step is called annualization, and its purpose is to stop a year of benefit cost being concentrated onto the handful of Davis-Bacon hours where it would buy the largest credit.

Using the defaults above: $9,600 of health and welfare, $2,400 of pension, $1,600 of vacation and holiday, and $400 of training add to $14,000 a year. Divided by 2,000 hours actually worked, that is a $7.00 per hour fringe credit against an $8.25 requirement, leaving $1.25 per hour short. Note that 2,080 is only a fallback when the hours are genuinely unknown. A worker who logged 1,400 hours divides by 1,400, which produces a larger credit, provided the contribution really was made for the full year.

A few details decide whether a cost counts at all:

• Unfunded plans can count. 29 CFR 5.28 credits reasonably anticipated costs under an enforceable commitment to carry out a financially responsible plan, such as self-funded vacation or self-insured health coverage. Those costs annualize on the same divisor.
• Defined-contribution pensions have an annualization exception. A plan that provides immediate participation and essentially immediate vesting (within 500 hours worked) is excepted. Other exceptions require a written request to the WHD Administrator under 29 CFR 5.25(c)(3).
• Payroll taxes and workers compensation never count. They are legally required, not bona fide fringe benefits, so they cannot be credited here. That burden math lives in the employer cost calculator and the labor cost percentage calculator.

If the work does not fit any classification printed on the determination, the contracting agency files a conformance request on Standard Form SF-1444 with the Wage and Hour Division to add a classification, a base rate, and a fringe rate. Do not guess a rate in the meantime.

Paying the shortfall as cash in lieu of fringe benefits

29 CFR 5.31(a) lets you meet the same obligation more than one way: all cash, all bona fide benefit contributions, or any mix of the two. That is why this calculator computes a single top-up against the combined package rather than a separate fringe-only shortfall. With a $32.50 base and an $8.25 fringe, the required package is $40.75 per hour. Pay $32.50 in cash and earn a $7.00 credit, and $1.25 per hour rides on the check as cash in lieu, bringing the straight-time cash rate to $33.75.

That top-up is ordinary taxable wages. It is subject to federal and state income tax withholding and to FICA exactly like the base rate, and it shows up as a wage line on the stub, not as a benefit. The pay stub generator shows what the resulting check looks like once the cash in lieu is folded in.

Because the obligation is combined, the arithmetic works in both directions. A worker paid $31.00 in cash with a $10.00 fringe credit is at $41.00 per hour against a $40.75 requirement, so no cash top-up is owed even though the base rate is $1.50 under the determination. Before you lean on that, check two things. The overtime premium is still built on at least the determination basic hourly rate. And many states run their own prevailing wage laws (often called Little Davis-Bacon) with stricter fringe rules that forbid the offset. This calculator models the federal DBA and DBRA rules only.

Overtime on prevailing wage jobs: 1.5 times the base rate, never the fringe

This is the most expensive misunderstanding in certified payroll, and it runs in both directions. Some contractors multiply the whole package by 1.5 and overpay. Others drop the fringe entirely after 40 hours and underpay, which is a violation.

The rule: fringe benefit amounts are excluded from the regular rate used to compute the overtime premium under 29 CFR 5.32(a), and 5.32(c)(1) extends the same exclusion to cash paid in lieu of fringes. So neither the benefit credit nor the top-up gets multiplied. But fringe is still owed for every hour worked, overtime hours included, at its straight-time rate.

Two examples from the regulation set the premium base. Under 5.32(c)(2), a contractor paying a $3.25 cash rate where the determination says $3.00 computes the premium on $3.25, the rate actually paid. Under 5.32(c)(3), a contractor dropping the cash wage to $2.75 and claiming $1.00 in benefits still computes the premium on $3.00, because the determination basic hourly rate is a floor. The premium base is therefore the higher of what you pay and what the determination requires.

Worked through the defaults: 1.5 times $32.50 is $48.75, plus $1.25 cash in lieu is $50.00 of cash per overtime hour, plus the $7.00 benefit credit for a $57.00 effective package hour. CWHSSA overtime obligations attach to prime contracts over $100,000. For the general FLSA regular-rate case on non-covered work, use the overtime pay calculator.

Turning these numbers into a WH-347

Column 6 of the WH-347 is headed "Rate of Pay, including fringe benefits" and takes the cash rate first, then any cash paid in lieu of fringes, separated by a slash. DOL's own example is $12.25/.40. The straight-time box gets your base plus the top-up written as $32.50/1.25; the overtime box gets the premium rate plus the cash paid in lieu of fringes, $48.75/1.25. When every fringe went to an approved plan and no cash was paid in lieu, write the bare rate with no slash, because the notation exists only to disclose cash actually substituted for benefits.

On the Statement of Compliance, check 4(a) when fringes were paid into approved plans, funds, or programs, check 4(b) when you paid them in cash, and describe anything that fits neither under 4(c). Signing it carries the 18 U.S.C. 1001 penalty for false statements, so the numbers need to match your actual records.

Auditors keep writing up the same avoidable rejections. A fringe credit averaged across weeks or across jobs instead of annualized. Estimated benefit costs reported in place of what was actually incurred. Fringe left off overtime hours. Each one starts with bad hours, so square those away first with the timesheet hours calculator. Once the rates are settled, the Payroll Calculator app runs the full multi-employee payroll behind them, with federal, state, and FICA withholding plus employer SUTA and FUTA per worker.