FLSA Overtime Premium: Regular Rate, Calculation, and Penalties

The FLSA overtime calculation is a half-time premium added to an employee’s straight-time earnings for every hour worked beyond 40 in a single workweek. You find the employee’s regular rate of pay for that week, multiply it by 0.5, and multiply that half-time figure by the number of overtime hours. The regular rate is almost never just the base hourly wage, because bonuses, commissions, shift differentials, and most other compensation get folded in before the math begins. Getting the regular rate wrong is the single most common source of overtime violations, and the penalties can double the amount of unpaid wages.¹

Each Workweek Stands Alone

Before touching the math, fix the unit. A workweek is any fixed, recurring 168-hour block: seven consecutive 24-hour periods. It can start on any day at any hour, but once set, it stays set. You cannot average hours across two or more weeks to avoid overtime, even when the pay period is biweekly or semimonthly.¹ An employee who works 50 hours one week and 30 the next is owed 10 hours of overtime for the first week. The 30-hour week does not offset it.

Overtime applies only to non-exempt employees. If the worker satisfies the salary-level, salary-basis, and duties tests for a bona fide executive, administrative, professional, outside sales, or computer exemption, no overtime is owed and the calculation below does not apply.² Everyone else is non-exempt, and the rest of this article is about their pay.

Building the Regular Rate

The regular rate is the real hourly price of the employee’s labor for a particular workweek, and it usually differs from the stated hourly wage. Compute it fresh each week by adding up the employee’s total includable compensation and dividing by the total hours actually worked that week.³

For an employee paid a single hourly rate with no other compensation, the hourly rate is the regular rate.⁴ Once anything else enters the paycheck, the regular rate rises above that base wage.

Payments That Go Into the Regular Rate

The FLSA treats the regular rate as a catch-all. Every form of pay for work performed goes in unless it falls into one of eight narrow statutory exclusions. That means you include:⁵

Non-discretionary bonuses: any bonus tied to production, attendance, quality, efficiency, safety, or a set formula. If it was announced in advance or the employee expects it under established criteria, it counts.⁶
Commissions and piece-rate pay.
Shift differentials for evening, night, or weekend hours.
On-call pay and hazard pay.
The reasonable cost of employer-provided meals or lodging.

Payments That Stay Out

Excluded from the regular rate:³

Gifts and special-occasion bonuses, if they are not measured by hours worked, production, or efficiency and the employee has no contractual right to them.⁷
Paid time off: vacation, holiday, and sick pay for periods when no work is performed.
Business expense reimbursements.
Truly discretionary bonuses. A bonus is discretionary only when both the decision to pay and the amount are set entirely at the employer’s sole discretion near the end of the period, with no prior promise or expectation. This is a narrower category than most employers assume.
Employer contributions to retirement, insurance, or similar benefit plans.
Reporting or show-up pay for time when the employee reported but performed no work.

The Basic Overtime Calculation

Federal law requires at least one and one-half times the regular rate for every hour over 40.⁸ In practice, employers use the half-time premium method. Straight-time pay already covers every hour worked, including the overtime hours, so the employer owes an additional half of the regular rate for each hour past 40.

Take an employee paid $15.00 an hour who works 46 hours in a workweek with no other pay:

Regular rate: $15.00.
Straight-time pay: $15.00 × 46 = $690.00.
Half-time premium: $15.00 × 0.5 × 6 overtime hours = $45.00.
Total gross pay: $735.00.

That is the same result as paying $15.00 for 40 hours plus $22.50 for 6 overtime hours. The half-time method reaches it differently.⁴

When a Bonus or Shift Differential Is in the Mix

Once non-discretionary pay enters the week, the regular rate rises and the math adds a step. Say an employee earns $15.00 an hour, works 45 hours, receives a $1.00 evening shift differential for 30 of those hours, and earns a $100.00 non-discretionary bonus:⁶

Total compensation: ($15.00 × 45) + ($1.00 × 30) + $100.00 = $805.00.
Regular rate: $805.00 ÷ 45 = $17.89.
Half-time premium: $17.89 × 0.5 × 5 overtime hours = $44.72.
Total gross pay: $849.72.

The $805.00 already covers straight time for all 45 hours. Only the extra half-time piece on the five overtime hours gets added.

Two Jobs, Two Rates, One Workweek

When the same employee works two jobs at different hourly rates for the same employer in the same workweek, the regular rate is a weighted average. Add total earnings from both rates and divide by total hours worked.⁹ For 25 hours at $14.00 and 20 hours at $18.00: total earnings are $710.00, the regular rate is $710.00 ÷ 45 = $15.78, the half-time premium on 5 overtime hours is $39.44, and total gross pay is $749.44.

Bonuses That Span Multiple Workweeks

Monthly, quarterly, and annual bonuses create a timing problem: you cannot finish the regular-rate math for any given workweek until you know the bonus amount. The regulations let you pay overtime at the base rate during the bonus period and then go back and pay the additional overtime owed once the bonus is calculated.⁹

Allocate the bonus across the covered workweeks in proportion to what was earned each week. If proportional allocation is impossible, dividing the bonus equally across the weeks is a reasonable alternative. For every workweek in the period where overtime was worked, the employer then owes an additional amount equal to half the per-hour bonus increase multiplied by the overtime hours worked that week. Skipping this retroactive step is one of the most common FLSA mistakes among employers that pay performance bonuses.

The Fluctuating Workweek Method

Salaried non-exempt employees whose hours change week to week can be paid under the fluctuating workweek method, which produces a smaller overtime premium than the standard calculation. The fixed salary covers all straight-time hours no matter how many. The regular rate drops in high-hour weeks (salary ÷ actual hours), and the employer owes only the half-time premium on hours past 40.¹⁰

Five conditions must all be satisfied:¹¹

The employee’s hours genuinely fluctuate week to week.
The salary is fixed and does not change with hours worked.
The salary is high enough to cover at least minimum wage in the heaviest week.
Both parties clearly understand the salary compensates for all hours worked each week, however many or few.
The employee still receives the half-time overtime premium on top of salary for hours over 40.

Example: an employee receives a fixed weekly salary of $600 and works 48 hours. Regular rate: $600 ÷ 48 = $12.50. Half-time premium: $12.50 × 0.5 × 8 = $50.00. Total pay: $650.00. If the same employee works 35 hours the next week, they still get the full $600 with no overtime owed.¹⁰

Counting the Hours That Feed the 40

Accurate math depends on accurate hours. Categories that trip employers up:¹²

Travel between job sites during the day is work time. The ordinary home-to-workplace commute is not.
Special one-day out-of-town assignments: travel to and from the other city counts as hours worked, minus the time of a normal commute.
Overnight travel counts as hours worked when it falls during normal working hours on any day of the week, including days the employee does not usually work.
Training and meetings count as work time unless all four conditions are met: outside normal hours, truly voluntary, not directly related to the job, and no productive work done during the session.

Employers may round clock-in and clock-out times to the nearest quarter-hour, with 1 to 7 minutes rounded down and 8 to 14 minutes rounded up. The rounding has to be neutral over time. Always rounding down violates the FLSA.¹³

One shortcut that is not allowed: private-sector employers cannot substitute comp time for overtime pay. Offering an hour and a half off next week instead of cash this week is a violation regardless of whether the employee agrees. Only state and local government employers may use comp time, at 1.5 hours per overtime hour, capped at 480 hours for emergency and law enforcement personnel and 240 hours for other public employees.¹⁴

What Miscalculation Costs

An employer that underpays overtime owes the full amount of unpaid wages plus an equal amount in liquidated damages, doubling the liability. Ten employees shorted $2,000 each over two years produce a $20,000 back-pay bill and another $20,000 in liquidated damages before attorney’s fees.¹⁵

The FLSA also requires the employer to pay the prevailing employee’s reasonable attorney’s fees and court costs on top of damages. The fee-shifting provision is why employment lawyers take many of these cases on contingency.¹⁵ For repeated or willful violations, the Department of Labor can assess civil money penalties of up to $2,515 per violation based on the most recently published inflation-adjusted figures.¹⁶

Employees have two years from each violation to file a claim, extended to three years for willful violations.¹⁷ Because each miscalculated workweek is a separate violation, exposure builds across the whole lookback period.

State Laws That Change the Math

The FLSA is a floor. A few states require overtime on a daily basis that federal law does not. Alaska and California require overtime after 8 hours in a single day, even when total weekly hours stay under 40. California also mandates double time after 12 hours in a day. Other states have daily overtime triggers at higher thresholds or for specific industries. When federal and state rules both apply, follow whichever produces more pay for the employee. If you operate in more than one state, check each state’s rules before relying on the federal 40-hour weekly calculation alone.

1
U.S. Department of Labor. Fact Sheet 23: Overtime Pay Requirements of the FLSA
2
U.S. Department of Labor. Fact Sheet 17G: Salary Basis Requirement and the Part 541 Exemptions Under the FLSA
3
U.S. Department of Labor. Fact Sheet 56A: Overview of the Regular Rate of Pay Under the FLSA
4
eCFR. 29 CFR 778.110 – Hourly Rate Employee
5
eCFR. 29 CFR Part 778 Subpart C – Payments That May Be Excluded From the Regular Rate
6
U.S. Department of Labor. Fact Sheet 56C: Bonuses Under the FLSA
7
eCFR. 29 CFR 778.212 – Gifts, Christmas and Special Occasion Bonuses
8
Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours
9
eCFR. 29 CFR Part 778 – Overtime Compensation
10
U.S. Department of Labor. Fact Sheet 82: Fluctuating Workweek Method of Computing Overtime
11
Federal Register. Fluctuating Workweek Method of Computing Overtime
12
U.S. Department of Labor. Fact Sheet 22: Hours Worked Under the FLSA
13
U.S. Department of Labor. Fact Sheet 53: The Health Care Industry and Hours Worked
14
U.S. Department of Labor. Fact Sheet 7: State and Local Governments Under the FLSA
15
Office of the Law Revision Counsel. 29 USC 216 – Penalties
16
U.S. Department of Labor. Civil Money Penalty Inflation Adjustments
17
Office of the Law Revision Counsel. 29 USC 255 – Statute of Limitations