How Overtime Pay Is Calculated: Federal and State Rules Explained

1. Federal FLSA Overtime Basics

The Fair Labor Standards Act (FLSA), enacted in 1938, is the cornerstone of U.S. overtime law. It requires that covered, non-exempt employees receive overtime pay at a rate of at least 1.5 times their regular rate of pay for all hours worked beyond 40 in a single workweek. This rule applies regardless of whether the extra hours were pre-approved by a manager — if the employer allowed or knew about the work, they must pay for it.

A workweek under FLSA is defined as any fixed, regularly recurring period of 168 consecutive hours — seven consecutive 24-hour periods. The workweek does not have to align with a calendar week; an employer might designate Tuesday through Monday as its workweek. What matters is consistency: once established, the workweek cannot be shifted to avoid overtime obligations.

One of the most important — and most commonly violated — rules is that employers cannot average hours across two or more workweeks. If an employee works 50 hours in week one and 30 hours in week two, they are owed 10 hours of overtime for week one. The 10-hour surplus from week one cannot be "balanced out" by the deficit in week two. Each workweek stands alone.

The FLSA applies to any enterprise with at least $500,000 in annual revenue, or any business engaged in interstate commerce — which, in practice, includes virtually every company in the U.S. that uses mail, telephone, or the internet in its operations. Individual employees can also be covered based on their own work activities, even if their employer's revenue is below the threshold.

The U.S. Department of Labor's Wage and Hour Division enforces FLSA. Employers who violate overtime rules can be held liable for the unpaid wages, an equal amount in liquidated damages, attorney's fees, and civil penalties up to $1,000 per violation for willful or repeat offenders.

2. Non-Exempt Employee Eligibility

The FLSA distinguishes between non-exempt employees (who are entitled to overtime) and exempt employees (who are not). The default assumption is that an employee is non-exempt — the burden falls on the employer to demonstrate that an exemption applies. If there is any doubt, assume the employee is entitled to overtime.

Virtually all hourly workers are non-exempt. If you punch a time clock and are paid by the hour, you almost certainly qualify for overtime after 40 hours in a workweek. But hourly pay alone isn't the test — it's just the most common indicator.

Salaried employees earning less than $684 per week (equivalent to $35,568 per year, as of the 2024 DOL rule) are also automatically non-exempt, regardless of their job duties. This salary threshold has been a moving target: a proposed 2024 rule would raise it to $1,128/week ($58,656/year) in stages, though legal challenges have created uncertainty. Always check the current DOL threshold.

Part-time workers are fully protected. If a part-time employee works 45 hours in a given week, they are owed 5 hours of overtime pay — there is no exemption or reduced protection for part-time status. The 40-hour threshold applies universally to non-exempt workers.

Independent contractors are excluded from FLSA — but this is one of the most misused loopholes in employment law. Worker classification is based on economic reality, not job title or a written contract. Courts and the DOL use multi-factor "economic reality" tests to determine whether a worker is truly independent or effectively an employee. If a company controls when, where, and how work is performed, provides all equipment, and the worker has no opportunity for profit or loss based on their own business judgment, they are likely an employee. Misclassification is rampant, especially in gig economy sectors, and workers who suspect it can file complaints with the DOL without retaliation protection at risk.

3. The Three White-Collar Exemptions in Detail

The FLSA's most commonly cited overtime exemptions are the three "white-collar" exemptions: Executive, Administrative, and Professional. Each requires passing both a salary test and a duties test. A job title — "manager," "director," "analyst," "supervisor" — means absolutely nothing without the underlying substance to back it up. The DOL and courts look at what an employee actually does day-to-day, not what their business card says.

Executive Exemption: The employee must (1) earn at least $684/week on a salary basis, (2) have a primary duty of managing a recognized department or subdivision, (3) customarily and regularly direct the work of at least two full-time equivalent employees, and (4) have the authority to hire, fire, or have significant influence over personnel decisions. A shift supervisor who can send workers home early but has no real hire/fire authority likely does not qualify. Courts scrutinize the "customarily and regularly" language — an occasional supervisory task is not enough.

Administrative Exemption: This applies to employees who (1) earn at least $684/week on salary, (2) perform office or non-manual work directly related to the management or general business operations of the employer or its customers, and (3) exercise discretion and independent judgment with respect to matters of significance. The third prong is critical and frequently litigated. Routine data entry, following scripts, or applying fixed standards does not constitute discretion on significant matters. The administrative exemption was designed for employees who have real authority to formulate policy, represent the company in negotiations, or make consequential independent decisions.

Professional Exemption: Covers employees who (1) earn at least $684/week on salary and (2) perform work requiring advanced knowledge in a field of science or learning customarily acquired by a prolonged course of specialized intellectual instruction — or perform work requiring invention, imagination, originality, or talent in a recognized creative field. Classic examples include licensed physicians, attorneys, engineers, architects, teachers, and CPAs. The knowledge must be acquired through formal education, not merely experience. A self-taught financial expert without a relevant degree may not qualify.

All three exemptions fail if the employee does not meet both the salary basis and duties tests simultaneously. Employers who rely solely on salary to classify employees as exempt are making an error that can lead to significant back-pay liability covering years of unpaid overtime.

4. Regular Rate of Pay — It's More Than Just Your Base Wage

One of the most misunderstood aspects of overtime law is the definition of the "regular rate of pay." Many employers — and employees — assume that overtime is simply 1.5x the base hourly wage. But the regular rate is a legally defined figure that must include virtually all compensation paid in a workweek, with only specific statutory exclusions.

The following types of compensation must be included in the regular rate when calculating overtime:

• Shift differentials (e.g., extra $2/hr for night shifts)
• Non-discretionary bonuses — bonuses promised in advance, tied to productivity, attendance, or meeting specific goals
• Commissions paid in that workweek
• Piece-rate premiums
• On-call payments if required to remain on premises

What is excluded: gifts, purely discretionary bonuses (not promised or expected), vacation/holiday pay, reimbursed expenses, and contributions to bona fide benefit plans.

Here is a worked example with a non-discretionary bonus:

Note the methodology: because the employee already received straight-time pay for all 48 hours in the base calculation, only the 0.5x premium is added — not the full 1.5x — to avoid double-counting. This "half-time" method is the DOL-approved approach when all hours are compensated at the regular rate. If overtime hours were not included in the straight-time calculation, you would apply the full 1.5x premium to those hours instead.

5. Standard Worked Example: Simple Hourly Employee

Let's walk through the full overtime calculation for a standard hourly employee with no additional forms of compensation, then extend it to show what changes when a non-discretionary bonus enters the picture.

Base scenario: Maria earns $18.00/hr and works 52 hours in a workweek.

Common mistake — the "half-time add-on" confusion: Some employers calculate overtime by paying straight time for all hours and then adding only the 0.5x premium. This is mathematically identical for a simple hourly worker with no bonus, but the approach changes if other compensation is involved. The distinction matters when calculating the regular rate with bonuses — the total all-inclusive regular rate must be determined first.

Extended scenario with a non-discretionary bonus: Same employee, 52 hours, but she also earns a $150 production bonus that week.

Without correctly factoring in the bonus, an employer might calculate OT as 12 × $27 = $324 and total as $936 + $150 + $324 = $1,410 — but this double-counts the straight-time already included in $936. The correct total, $1,211.31, is significantly different. Employees who suspect their employer is not correctly incorporating bonuses into their overtime calculation should document the discrepancy and contact the DOL's Wage and Hour Division.

The fluctuating workweek method is a separate arrangement where a salaried employee receives a fixed salary regardless of hours, and overtime is calculated at a lower 0.5x multiplier. This is legal only when specific conditions are met, is not the default, and requires a clear mutual understanding between employer and employee. Do not assume this method applies to you without explicit confirmation in your employment agreement.

6. States with Daily Overtime Requirements

While federal FLSA only requires overtime after 40 hours per workweek, several states go further and mandate overtime for long daily shifts — even if you haven't hit 40 hours for the week. If you live or work in one of these states, state law applies and will often result in higher overtime pay than the federal standard alone.

California has the most comprehensive daily overtime rules in the country:

• 1.5x pay for all hours over 8 in a single workday
• 2x pay for all hours over 12 in a single workday
• 1.5x pay for the first 8 hours worked on the 7th consecutive day in a workweek
• 2x pay for all hours over 8 on the 7th consecutive day

California's rules are calculated daily, not cumulatively. Working 9 hours Monday triggers 1 hour of daily overtime regardless of the rest of the week's schedule. Employers cannot require employees to "bank" daily overtime against days they work fewer hours.

Alaska requires overtime at 1.5x for hours worked beyond 8 in a day OR 40 hours in a week, whichever standard provides greater compensation to the employee. This means an employee who works four 10-hour days (40 hours total) still earns 8 hours of daily overtime under Alaska law — they would not earn weekly overtime under the federal standard alone.

Nevada requires 1.5x daily overtime after 8 hours per day, but only for employees earning less than 1.5 times the state minimum wage. As the state minimum rises, more workers may fall outside this protection unless their wage keeps pace.

Colorado requires 1.5x overtime for hours exceeding 12 in a workday, in addition to the federal 40-hours-per-week threshold. Colorado also has overtime rules for work beyond 12 consecutive hours in a shift. The Colorado COMPS Order (Colorado Overtime and Minimum Pay Standards) governs these rules and is updated periodically.

Workers in these states should track both daily and weekly hours to determine which calculation method yields higher overtime pay. In any conflict between federal and state law, the standard more favorable to the employee governs.

7. What Employers Cannot Legally Do

Understanding your overtime rights means knowing not just what you're owed, but what your employer is prohibited from doing. The following practices are illegal under FLSA and, in many cases, actionable — meaning employees can sue or file DOL complaints and recover back wages plus damages.

Offering comp time instead of overtime pay (private sector). This is illegal, full stop. Private employers cannot tell you that you'll get Friday afternoon off in exchange for working 46 hours this week. Compensatory time is only permitted for state and local government employers under specific conditions. Private sector employees must be paid cash overtime.

Averaging hours across multiple weeks. Some employers try to smooth out overtime by asking employees to work 50 hours one week and 30 the next, then claiming no overtime is owed because the "average" is 40. This is prohibited. Each workweek is independent. The employee who worked 50 hours is owed 10 hours of overtime that week, period.

Refusing to pay overtime for unauthorized hours. If an employer did not authorize the extra hours, they can discipline the employee for working them — but they cannot refuse to pay. The obligation to compensate arises from the work being performed, not from prior authorization. "We didn't tell you to stay late" is not a defense to non-payment.

Docking salaried exempt employees for partial-day absences. Exempt employees must be paid their full salary for any week in which they perform any work, regardless of the number of hours or days worked. Making deductions for a 2-hour absence to attend a doctor's appointment can destroy the "salary basis" of their compensation and eliminate the exemption — making the employer liable for overtime for the entire period those deductions occurred.

Misclassifying workers as independent contractors. As noted earlier, calling someone a contractor doesn't make them one. Employers who deliberately misclassify employees to avoid overtime obligations face significant liability: back wages for up to 3 years (if willful), liquidated damages, and in some states, treble damages and attorney's fees.

Retaliating against employees who assert overtime rights. The FLSA's anti-retaliation provision is broad. Employees who complain to their employer about unpaid overtime, file a DOL complaint, cooperate with an investigation, or file a private lawsuit are protected from adverse employment actions — firing, demotion, reduced hours, or harassment. Retaliation is a separate violation that carries its own penalties and can support additional damages in litigation.