Overtime With Two Pay Rates, Explained: How the Weighted-Average Rule Sets Your Time-and-a-Half
You pick up a charge shift on Thursday, and it pays more per hour than the three staff shifts you worked Monday through Wednesday. The week ends at 48 hours. Now the stub shows an overtime line, and a fair question follows: time-and-a-half of which rate? Your base rate, your charge rate, the higher of the two, or something in between?
Federal law has a specific answer, and it's neither of the first two guesses. It's also not the simple midpoint of your two rates, which is the guess most people make next.
The rule: a weighted average of the rates you actually worked
When an employee works two or more different types of work in one workweek at different non-overtime rates, the overtime rate is built from a weighted average. The regulation, 29 CFR § 778.115, says: "Where an employee in a single workweek works at two or more different types of work for which different nonovertime rates of pay (of not less than the applicable minimum wage) have been established, his regular rate for that week is the weighted average of such rates." The Department of Labor repeats the same method in Fact Sheet #23: the earnings from all rates are added together, and that total is divided by the total hours worked at all jobs.
In plain steps, run fresh each workweek:
- Total earnings = (hours at rate A × rate A) + (hours at rate B × rate B), at straight time, for every hour worked.
- Regular rate = total earnings ÷ total hours worked.
- Overtime premium = regular rate × 0.5 × hours over 40.
The last step is only a half because the straight-time pay for every hour, overtime hours included, is already counted in step 1. Overtime hours only need the extra half on top. (Multiplying by 1.5 and also paying straight time on those hours would pay the straight-time part twice.) Federal law also defines the regular rate broadly: 29 U.S.C. § 207(e) says it "shall be deemed to include all remuneration for employment," subject to a short list of exclusions. That is why a charge or lead premium, a unit-specific rate, or a shift differential all belong in step 1. (Differentials get their own treatment in shift differential vs. overtime.)
Worked week 1: three staff shifts and one charge shift
A nurse works four 12-hour shifts: three staff shifts at $40/hour and one charge shift at $44/hour. That's 48 hours.
- Staff earnings: 36 hours × $40 = $1,440
- Charge earnings: 12 hours × $44 = $528
- Total straight-time earnings: $1,440 + $528 = $1,968
- Regular rate: $1,968 ÷ 48 = $41.00
- Overtime hours: 48 − 40 = 8
- Overtime premium: $41.00 × 0.5 × 8 = $164.00
- Total pay for the week: $1,968 + $164 = $2,132.00
Two common shortcuts, both wrong:
- Base rate only. Half of $40 on 8 hours is $160. That's $4 short, because the higher charge rate was left out of the regular rate.
- Simple average of the two rates. ($40 + $44) ÷ 2 = $42, which overstates the regular rate. Only one of the four shifts was at $44, so the correct rate sits much closer to $40. The average has to be weighted by hours.
Worked week 2: a bigger gap between the rates
Gaps matter more when the rates are far apart. Say someone works 30 hours in a base role at $18/hour and 18 hours in a second role (same employer) at $34/hour: 48 hours.
- Base role: 30 × $18 = $540
- Second role: 18 × $34 = $612
- Total: $1,152
- Regular rate: $1,152 ÷ 48 = $24.00
- Overtime premium: $24.00 × 0.5 × 8 = $96.00
- Total pay: $1,152 + $96 = $1,248.00
If the overtime line were calculated on the $18 base rate only, the premium would be $18 × 0.5 × 8 = $72. That's $24 short in a single week, and it repeats every week the same split happens.
The alternative: overtime at the rate of the work being done
There is a second legal method, and it's the one most likely to explain a stub that doesn't match the formula above. Under 29 U.S.C. § 207(g)(2) and 29 CFR § 778.419, an employee who does two or more kinds of work at different hourly rates may agree with the employer in advance that overtime hours will be paid at not less than one and one-half times the rate for the type of work being done during those overtime hours. The rates must be bona fide: the rate for each kind of work has to be the one actually paid for that work during non-overtime hours.
Run the week 1 numbers through that method. The straight-time total stays $1,968. The extra half lands on the 8 overtime hours:
| Which hours are the overtime hours | Extra half-time | Week total |
|---|---|---|
| Last 8 hours worked fall in the $44 charge shift | 8 × $22.00 = $176.00 | $2,144.00 |
| Weighted-average method (the default) | 8 × $20.50 = $164.00 | $2,132.00 |
| Last 8 hours worked fall in a $40 staff shift | 8 × $20.00 = $160.00 | $2,128.00 |
The spread is small here ($16 from top to bottom), but notice what the alternative does: it ties your overtime to when in the week the high-rate work lands. That can help or hurt you from week to week, which is why the regulation requires a prior agreement instead of letting an employer switch methods after the fact. If no such agreement exists, the weighted average is the default.
Where this goes wrong in practice
- Different employers don't blend. The weighted average applies to work for the same employer. A second job elsewhere is a different question; see off-duty second job overtime rules.
- Bonuses belong in step 1 too. A non-discretionary bonus raises the regular rate for the weeks it covers; see the earlier post on recalculating overtime after a non-discretionary bonus.
- Payroll may pay the premium off a single pay code. Some setups put "overtime" on one base-rate code and skip the blending. If the premium on your stub equals exactly your base rate × 0.5 × overtime hours, and you worked at a higher rate that week, the blend is worth asking about.
- State rules can add their own thresholds. Some states count overtime by the day as well as the week, and some have their own rules for how the regular rate is built. The federal formula is the floor, not a ceiling.
What to check on your own stub
- List your hours at each rate for the workweek. Your schedule or timecard should show which shifts were charge, float, specialty-unit or standard.
- Multiply each by its rate, add them, and divide by total hours. That's your regular rate.
- Compare half of that rate × overtime hours to the premium line. If the stub is lower, check whether you signed an agreement for the alternative method before assuming an error.
- Keep the split by date, not by memory. Which shift carried which rate is exactly what disappears first when a pay period is questioned.
That last point is the everyday use for a shift calendar like Duty Pals: when your real schedule is on a calendar with each shift's role and hours, the by-rate split in step 1 is a lookup rather than a reconstruction. Duty Pals is currently in pre-registration; you can sign up to be notified when it launches.
Overtime rules vary by state, employer, and written agreement, and this is a general explanation of the federal weighted-average method and its documented alternative, 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.