Day-Rate Pay and Overtime, Explained: The Half-Time Math Most Day-Rate Crews Never See

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A twelve-hour day and an eight-hour day pay exactly the same on a lot of drilling rigs, pipeline crews, and some trucking runs: one flat day rate, whatever the clock actually did. It's easy to assume that arrangement lives outside the overtime rules entirely — there's no hourly rate on the stub to multiply by 1.5, so what would time-and-a-half even apply to? Federal law has a specific, if easy-to-miss, formula for exactly this situation, and it does not exempt day-rate work from overtime. It just calculates it differently than an hourly job would.

What counts as day-rate pay

Day-rate (also called "job rate") pay means an employee is paid a flat sum for a day's work or for completing a specific job, regardless of how many hours that day or job actually took. It shows up most often in oil and gas field crews (roughnecks, floor hands, company men, toolpushers on drilling and workover rigs), some over-the-road trucking arrangements paid per day or per load rather than per mile or per hour, and day-labor construction and pipeline crews.

One big caveat for drivers: most interstate truck drivers fall under the FLSA's Motor Carrier Act exemption (29 U.S.C. § 213(b)(1)), which removes the federal overtime requirement for them entirely — day rate or not. The formula below matters for drivers who aren't covered by that exemption (for example, many purely local or intrastate drivers, or those in small vehicles), and some states set their own rules. Check which category you're in before running the math.

This only changes how overtime is calculated — it doesn't remove the requirement. The regulation is 29 CFR § 778.112, and its text is short enough to quote in full:

"If the employee is paid a flat sum for a day's work or for doing a particular job, without regard to the number of hours worked in the day or at the job, and if he receives no other form of compensation for services, his regular rate is determined by totaling all the sums received at such day rates or job rates in the workweek and dividing by the total hours actually worked. He is then entitled to extra half-time pay at this rate for all hours worked in excess of 40 in the workweek."

That's the same underlying idea as the fluctuating workweek method covered in an earlier post on salaried non-exempt overtime — the flat payment is treated as already covering straight-time pay for every hour, so the extra amount owed is just the additional "half," not a fresh time-and-a-half. The formula, run fresh each week:

Regular rate = total day-rate earnings for the week ÷ total hours actually worked Overtime pay = regular rate × 0.5 × overtime hours

Two real weeks on the same day rate

Take a $275 day rate and run it through two weeks where the same 5 days are worked, but the days themselves run different lengths.

Week A — 5 days, 9 hours each (45 hours total):

Week B — the same 5 days, 12 hours each (60 hours total):

Both weeks pay out the same $1,375 in base day-rate earnings — five days is five days — so the only thing moving is how many hours those five days took. That's the part worth sitting with: Week B has 15 more worked hours than Week A, and it pays $152.78 more ($1,604.17 − $1,451.39). Spread across those 15 extra hours, that's $10.19 an hour — noticeably below either week's own regular rate, because working longer days also dragged the regular rate down for the whole week, overtime hours included. The flat day rate doesn't know or care whether the day ran 9 hours or 12; the hours-worked denominator does all the moving, and it moves against you as the days get longer.

A six-figure day rate still isn't automatically overtime-exempt

It's tempting to assume day-rate pay is reserved for well-compensated specialists who wouldn't qualify for overtime anyway. The Supreme Court closed that assumption off directly in Helix Energy Solutions Group, Inc. v. Hewitt, 598 U.S. 39 (2023) (opinion, supremecourt.gov). Michael Hewitt worked as an offshore oil rig supervisor on 28-day hitches, working 12-hour days for the full stretch, paid a day rate between $963 and $1,341 — and he earned more than $200,000 in some years. His employer treated him as an exempt "highly compensated employee" and paid him no overtime at all.

The Court held 6–3 that a pure day rate, on its own, does not satisfy the FLSA's "salary basis" test for exemption — no matter how much it adds up to over a year — because a salary means a predetermined amount paid regardless of days or hours worked, and a day rate is the opposite of that by definition. There is a narrow exception under 29 CFR § 541.604(b): a day-rate arrangement can count as salary if it's paired with a weekly guarantee that bears a "reasonable relationship" to what the employee usually earns. Hewitt's pay had no such guarantee attached, so the exemption failed and he was owed overtime under the formula above, on top of a six-figure annual income.

The lesson translates directly to the drilling floor and beyond: what decides whether overtime applies is the pay structure, not how large the paycheck already looks.

California requires a different divisor

Federal law divides by all hours actually worked. California does not. Under Labor Code § 510, 8 hours is a full day's work, and anything beyond that in a single workday is owed overtime regardless of the weekly total. The California Division of Labor Standards Enforcement applies that same 8-hour ceiling to the divisor used to find a day-rate or salaried employee's regular hourly rate — the remuneration is divided by "the agreed or usual hours of work, exclusive of daily hours over eight," not by the hours actually worked that day. That principle comes out of Ghory v. Al-Lahham, 209 Cal. App. 3d 1487 (1989) (opinion, Justia), and the California Supreme Court reinforced the broader "divide by non-overtime hours, not all hours" approach for flat-sum pay in Alvarado v. Dart Container Corp., 4 Cal. 5th 542 (2018).

Run the same $275 day rate, 10-hour days, 5 days a week (50 hours total), under California's method:

Run that same schedule under the federal method instead: $1,375 total earnings ÷ 50 hours = $27.50 regular rate, 10 overtime hours (over 40, not over 8/day) at half-time = $137.50, for a total of $1,512.50. Same day rate, same hours worked, a $378.13 difference — because California counts overtime by the day and uses a fixed divisor, while federal law counts it by the week and lets the divisor move with actual hours worked.

What to check on your own pay stub

  1. Is the pay actually a flat sum per day, with no other hourly component? If there's any hourly piece mixed in, a different regulation applies.
  2. Does your total pay for the week, divided by your actual hours worked, match the overtime line on your stub? Run the division yourself — regular rate = total day-rate earnings ÷ hours worked.
  3. Which state's law governs your pay? If it's California, the divisor is 8 hours a day, not your actual daily hours, and overtime is counted daily as well as weekly.
  4. Is there a genuine weekly minimum guarantee attached to your day rate? If your employer calls you exempt because of a day rate alone, Helix v. Hewitt is the case that says that alone doesn't hold up.

Reconstructing exactly how many hours a given day or hitch actually ran is the part that gets lost fastest once the pay period closes — which is the plain use case for a shift calendar like Duty Pals: log the real schedule as it happens so the regular-rate math above is something you can check against your own numbers, not just the total on the stub. Duty Pals is currently in pre-registration; you can sign up to be notified when it launches.

Overtime rules vary by state and by employer, and this is a general explanation of the federal day-rate formula and one state's documented divergence from it, not advice about your specific paycheck. Your employer's written pay policy, your state labor department, and an employment attorney licensed in your state are the authorities on your situation.