How to Include a Bonus in Overtime Pay in California
You paid the bonus. You paid the overtime. You still underpaid the employee.
That is the shape of most bonus-and-overtime claims I see against California small businesses, and it is why they are so hard to spot internally. Nothing looks wrong. The bonus went out, the overtime hours were captured, the payroll system ran. The error is buried one layer down, in the arithmetic that converts a bonus into an hourly value — and California does that arithmetic differently from federal law, differently from most out-of-state payroll defaults, and differently from what a lot of software does out of the box.
Here is the rule, the math, and the audit.
The Rule: Overtime Is Paid on the Regular Rate, Not the Base Rate
Labor Code section 510 sets the multipliers — 1.5x after eight hours in a workday and after 40 in a workweek, 2x after 12 hours in a day, plus the seventh-consecutive-day rules. But every one of those multipliers attaches to the regular rate of pay, which is a calculated figure, not the number on the offer letter.
The Labor Commissioner's own guidance is explicit that the regular rate includes hourly earnings, salary, piecework earnings, commissions, shift differentials, and non-hourly compensation. A bonus that an employee earned by hitting a target is part of what they were paid for that week's work, so it raises the rate, and the overtime already paid at the lower rate is now short.
Counts toward the regular rateStays out of the regular rateNondiscretionary bonuses — attendance, safety, production, retention, anything promised or reasonably expectedGenuinely discretionary bonuses, where both the fact and the amount are decided after the fact, at the employer's sole choiceCommissionsGifts for special occasionsPiece-rate earningsExpense reimbursementsShift differentialsPay for vacation, holiday, or illness when no work was performedOther non-hourly compensationPremium pay for Saturday, Sunday, or holiday work
The word doing the work is discretionary. If your handbook, offer letter, or bonus plan describes the target, the formula, or the payout, the bonus is nondiscretionary no matter what the plan document calls it.
Flat-Sum Bonuses: California Has Its Own Formula
A flat-sum bonus is a fixed dollar amount that does not scale with hours or output — $200 for perfect attendance, $500 for working the holiday weekend. This is where California and federal law openly part company, and it is the single most common source of underpayment.
In Alvarado v. Dart Container Corp. of California (2018) 4 Cal.5th 542, the California Supreme Court held that the divisor for a flat-sum bonus is the number of nonovertime hours actually worked in the pay period — not total hours — and that the resulting per-hour value is multiplied by the full 1.5 (or 2.0), not by 0.5. The court also declined to apply the holding prospectively only, so it reaches back.
Take an employee at $22 an hour who works five nine-hour days — 45 hours, 40 of them nonovertime, five of them daily overtime — and earns a $200 flat attendance bonus that week.
California (Alvarado)Federal FLSA methodDivisor for the bonus40 nonovertime hours45 total hoursPer-hour value of the bonus$5.00$4.44Multiplier applied1.50.5Extra overtime owed on the bonus$37.50$11.11
The gap is $26.39 for one employee in one week. Run it out:
AmountPer employee, per week$26.39Per employee, per year~$1,372Ten employees, three-year limitations period~$41,000
That $41,000 is only the unpaid wages. It sits before interest and attorney's fees under Labor Code section 1194, before waiting-time penalties under section 203 for anyone who has separated, before wage-statement penalties under section 226 for every pay period that showed the wrong overtime rate, and before PAGA.
Production, Percentage, and Commission Bonuses Use Different Math
Not every bonus follows the Alvarado path, and applying the flat-sum formula everywhere will overpay you into a different problem.
Production bonuses — ones that rise with output or hours — are divided by total hours worked in the bonus-earning period, per the Labor Commissioner's guidance.
Percentage bonuses calculated as a flat percentage of total earnings, straight time and overtime together, generally need no recomputation at all. The California Court of Appeal approved that structure in Lemm v. Ecolab Inc. (Cal. Ct. App. 2023, No. B312232), reasoning that the percentage already carries the overtime with it. Drafted this way, a bonus plan can be self-correcting.
Commissions go into the regular rate and are handled on a weighted-average basis.
Two Pay Rates in the Same Week
If an employee works at more than one hourly rate — a lead rate on some shifts, a base rate on others — California uses the weighted average: total earnings for the workweek divided by total hours worked, including overtime hours. That is the regular rate for that week. Do not pay overtime at whichever rate the employee happened to be working when hour nine started.
The True-Up Nobody Runs
Quarterly and annual bonuses are where good intentions break down. A bonus earned over three months has to be apportioned back across the workweeks in which it was earned, and overtime for each of those weeks recomputed at the higher rate — the federal rule at 29 C.F.R. section 778.209 states it directly, and the Labor Commissioner's guidance frames bonuses in terms of the "bonus-earning period" for the same reason.
In practice that means a retroactive overtime true-up line on the paycheck that delivers the bonus. Most small employers simply never run it.
Your Seven-Step Audit
List every form of compensation your nonexempt employees receive beyond base hourly pay — bonuses, commissions, differentials, per-shift add-ons, gift cards tied to performance.
Classify each one: nondiscretionary or truly discretionary. Assume nondiscretionary if anything in writing describes how to earn it.
For each nondiscretionary item, identify its type — flat sum, production, percentage, or commission — because the formula turns on that.
Confirm what your payroll system actually does with a flat-sum bonus. Run a test week and check the divisor and the multiplier against the Alvarado numbers above.
Build the true-up for any bonus covering more than one pay period, and put it on a calendar.
Pull three months of wage statements and verify the overtime rate printed there matches the recalculated regular rate.
Quantify and correct anything you find before an employee does — voluntary correction is a materially different posture than the one you occupy after a PAGA notice arrives, or after the Labor Commissioner requests your payroll records.
Get It Right Before Someone Checks
Bonus-and-overtime errors are compounding, systematic, and identical across every employee on the plan — which is exactly the profile a plaintiff's firm wants. They are also entirely fixable in an afternoon of payroll review.
Employer Guidance Group PC defends California employers in wage and hour and PAGA matters and runs compliance audits that catch this category of error before it becomes a claim. Contact us to review your bonus plans and overtime calculations.
Sources: California Labor Code section 510; Division of Labor Standards Enforcement, Overtime FAQ; Alvarado v. Dart Container Corp. of California (2018) 4 Cal.5th 542; Lemm v. Ecolab Inc. (Cal. Ct. App. 2023, No. B312232); 29 C.F.R. section 778.209.
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