Davis-Bacon vs. Hawaiʻi Chapter 104: the overtime math that creates back-wage findings

A small electrical sub in Honolulu wins two jobs in the same month. One is a federally funded project at a military installation. The other is a state job for a county agency. Both are prevailing wage. Both require weekly certified payroll. The crews overlap.

If that sub computes overtime the same way on both jobs, one of them is wrong. Not “wrong in an edge case” — wrong on every overtime hour, for every affected worker, for every week of the job.

This is the single most common trap in prevailing wage work in Hawaiʻi, and it is entirely mechanical. Here is the math.

This is a practical explainer written by builders, not legal or tax advice. Wage determinations, statutes, and administrative interpretations change. Confirm against the governing wage determination for your job and with the U.S. Department of Labor’s Wage and Hour Division or Hawaiʻi’s Department of Labor and Industrial Relations, Wage Standards Division.

First: which regime governs?

Two separate laws, and the distinction is about the funding source, not geography.

Federal Davis-Bacon applies to federally funded or federally assisted construction contracts. The wage determination comes from the U.S. Department of Labor. It applies nationwide — a Davis-Bacon job in Hawaiʻi is a Davis-Bacon job, and the fact that you are in Honolulu does not make it a Chapter 104 job.

Hawaiʻi Revised Statutes Chapter 104 — “Wages and Hours of Employees on Public Works” — is the state’s own prevailing wage law, sometimes called a “little Davis-Bacon.” It applies to state and county public works, and the wage rates come from Hawaiʻi’s Department of Labor and Industrial Relations rather than the federal DOL.

The hard part is not the definition. It is that a single project can plausibly be either, and on a job with mixed funding it can be both — in which case the general principle is that you comply with the more protective requirement on each dimension, which is exactly the situation where the overtime difference below stops being academic.

Determine the regime before you bid, not before you file. It changes the wage rates, the overtime cost, and therefore the number you should have put on the bid.

The two overtime rules

Here is where the same crew, doing the same work, generates two different payrolls.

Federal (Davis-Bacon, with overtime under the Contract Work Hours and Safety Standards Act):

• Overtime is triggered over 40 hours in a workweek.
• The premium is computed on the basic hourly rate only. The fringe benefit amount listed in the wage determination may be excluded from the half-time premium.
• Fringe benefits are still owed for all hours worked, including overtime hours — but at straight time.

Hawaiʻi (HRS Chapter 104):

• Overtime is triggered by any hours over eight in a day, and by all hours worked on a Saturday, a Sunday, or a state legal holiday — regardless of how few hours are in the week.
• The rate is one and one-half times the basic hourly rate plus the cost of fringe benefits.

Two differences, and they compound. The state trigger is far easier to hit — a four-hour Saturday call-out is entirely overtime under Chapter 104 and entirely straight time under Davis-Bacon if the week is under forty. And the state base is bigger, because the fringe is inside it.

The math, on real numbers

Take an actual classification off a Hawaiʻi wage determination: a basic hourly rate of $56.55 with a fringe of $33.16, for a straight-time total of $89.71 per hour.

Federal overtime. Take the full straight-time prevailing wage and add half the basic rate:

$89.71 + (0.5 × $56.55) = $89.71 + $28.28 = $117.99 per overtime hour

Hawaiʻi Chapter 104 overtime. One and a half times base plus fringe:

1.5 × ($56.55 + $33.16) = 1.5 × $89.71 = $134.57 per overtime hour

A difference of $16.58 on every overtime hour — about 14%.

Run it out. One worker at ten overtime hours a week is $165.80. A five-person crew at that pace is $829 a week, $3,316 over a month-long push. On a job where you used the federal number on a state contract, that entire amount is a back-wage exposure, owed retroactively, per worker, per week it was wrong. Run it the other direction — state math on a federal bid — and you have simply bid high and lost work you could have done.

Neither error announces itself. Both are arithmetic performed correctly against the wrong rule.

The other three ways this goes wrong

Overtime is the most mechanical failure, but in practice most findings trace back to one of three things:

Wrong classification. The wage determination lists classifications, and the rate follows what the worker is actually doing, not their job title or their usual trade. A journeyman running conduit and then spending an afternoon on general labor may sit in two classifications on the same day, with hours split accordingly. Misclassifying downward is the expensive direction, and “that is what we have always called him” is not a defense.

Fringe paid short — or paid in the wrong form. The fringe portion can be satisfied in cash or through contributions to bona fide benefit plans, and the two are not interchangeable in the paperwork even when the dollars match. A contractor who provides health coverage cannot simply assume its value covers the fringe obligation; the annualized hourly value has to be computed and the shortfall paid. This is where a lot of otherwise careful small subs quietly drift out of compliance.

Overtime figured on the wrong base. Covered above — and it is worth noting that it survives payroll software, because most general payroll systems know federal FLSA overtime and know nothing about a state public-works statute.

What you actually file

Federally, weekly certified payroll is required, and the standard vehicle is Form WH-347. Worth knowing: DOL’s own instructions mark WH-347 as “for contractor’s optional use.” You are not required to use that specific form — you are required to submit the payroll information and the signed statement of compliance. The form is simply the well-trodden path, and using it means nobody at the agency has to figure out your format.

In Hawaiʻi, certified payrolls go to the contracting agency under Chapter 104, on the state’s own reporting basis.

The signature is the part people skim past. The statement of compliance is signed under penalty, and it asserts that the classifications and rates are correct. It is not a receipt. It is an attestation.

And if your general contractor mandates LCPtracker or a similar prime-level portal, you will still submit there. That portal is a submission channel; it is not a compliance check. It will accept a correctly formatted payroll built on the wrong classification without complaint.

The consequence, stated plainly

A gap becomes a back-wage finding: you owe the difference retroactively, for every affected worker, for every week it was wrong. It can also trigger a formal DOL or DLIR complaint, hold your retainage — which is to say, hold the money you were counting on to make payroll — and in repeat cases put future bids at risk.

The cash-flow mechanism deserves its own sentence, because it is the part that actually hurts a small sub: the prime withholds the progress payment until the certified payroll is clean. The compliance problem and the getting-paid-on-Friday problem are the same problem. That is why this is not paperwork that can wait until month end.

Why we built a tool for this

The reason this is hard for a two-truck subcontractor is not that the rules are secret. Everything above is public. It is that the rules are dispersed — the classification lives in the wage determination, the overtime rule lives in a statute, the fringe mechanics live in administrative interpretations, and the answer to “what do I pay this guy for Saturday” lives at the intersection of all three. Larger contractors solve this by employing someone who knows it, or by paying a consultant $150 to $500 to work out a single job.

WageDeck is that decision, made repeatable. Paste in a solicitation and it returns the governing regime, the classifications, the base-and-fringe split, the cash-versus-plan question, and the overtime and holiday traps for that specific job. Then it handles the weekly close: hours in, a compliance audit against the three failure modes above, and a generated WH-347 or Chapter 104 payroll report.

The decode is free and public, because the classification and fringe decision is the part that is genuinely hard and the part worth being judged on. The numbers in this post came off a real wage determination, not a sample. The self-serve weekly tool is built and open for early access.

Prevailing wage exists for a good reason: it stops public money from being used to bid wages down on public work. That is worth defending. What is not worth defending is a small local sub losing a month of margin to arithmetic performed against the wrong statute — which, in a state where a great deal of construction is public work and a great many contractors are small, is a tax on exactly the wrong people.

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Sources and further reading: Hawaiʻi DLIR — Prevailing Wages on Public Works · Requirements of Chapter 104, HRS (DLIR, eH104-3) · HRS §104-2 · DOL — Davis-Bacon Compliance Principles · DOL — CWHSSA / Overtime Pay on Government Contracts · 29 CFR Part 5, Subpart B — Fringe Benefits