Biweekly Overtime Calculator: Is OT Calculated Weekly or Biweekly? (2026)

Is Overtime Calculated Weekly or Biweekly?

Short answer: weekly. Always. Under the federal Fair Labor Standards Act (FLSA), overtime must be calculated on a single, fixed 7-day workweek — even when your employer pays you every two weeks. Averaging 80 hours across a biweekly pay period to avoid time and a half is illegal wage theft, and it's one of the most common payroll mistakes the U.S. Department of Labor recovers back wages for every year.

This guide explains the rule, walks through biweekly payroll examples, and shows how to spot (and recover) unpaid overtime when your employer averages your hours.

> Skip the math: plug your two-week schedule into our free overtime calculator — it splits biweekly hours into the two workweeks automatically and applies 2026 federal and state rules.

The FLSA Workweek Rule (29 CFR §778.105)

The FLSA defines a workweek as *"a fixed and regularly recurring period of 168 hours — seven consecutive 24-hour periods."* The workweek can start on any day and at any hour, but once set, the employer must use it consistently. Critically:

• Each workweek stands alone. Hours from one week cannot be averaged with another, even within the same biweekly, semi-monthly, or monthly pay period.
• Overtime is owed for every hour over 40 in a single workweek, calculated at 1.5× the regular rate.
• Pay frequency (weekly, biweekly, semi-monthly) does not change the calculation — only when the check is cut.

The Department of Labor restates this directly in Fact Sheet #23: *"Averaging of hours over two or more weeks is not permitted."*

How to Calculate Overtime on Biweekly Payroll

Follow this four-step method for any biweekly pay period:

• . Identify the workweek start day (e.g., Sunday 12:00 AM).
• . Split the 14-day period into two 7-day workweeks.
• . Total the hours worked in each workweek separately.
• . Apply time and a half to every hour over 40 — in each week independently.

Biweekly Overtime Formula

• Week 1 OT hours = MAX(0, Week 1 hours − 40)
• Week 2 OT hours = MAX(0, Week 2 hours − 40)
• Total OT pay = (Week 1 OT + Week 2 OT) × Regular Rate × 1.5
• Total gross = (Straight-time hours × Regular Rate) + Total OT pay

Worked Example — The Right Way

A warehouse associate in Texas earns $20/hour and works 48 hours in Week 1 (four 10-hour shifts plus an 8-hour Friday) and 32 hours in Week 2 (four 8-hour shifts).

Correct (FLSA) calculation:

• Week 1: 40 reg + 8 OT → (40 × $20) + (8 × $30) = $800 + $240 = $1,040
• Week 2: 32 reg + 0 OT → 32 × $20 = $640
• Biweekly gross: $1,680

The Same Example Done Illegally

If payroll averages 80 hours across the pay period (48 + 32 = 80), the employer pays 80 × $20 = $1,600 — no overtime — because the biweekly total didn't exceed 80. The worker is shorted $80 (the 8 OT hours from Week 1). Multiply that by 26 pay periods and a single employee can be owed $2,080/year in back wages.

Common Biweekly Overtime Mistakes Employers Make

The Wage and Hour Division's 2023–2025 enforcement data shows these patterns repeat across industries:

• Averaging hours to keep both weeks under 40 (the "80-hour myth").
• Shifting hours from a high week to a low week on the timesheet.
• Changing the workweek mid-period to mask overtime — only allowed if the change is permanent and doesn't reduce OT owed.
• Paying biweekly salary as if it covers all hours for a non-exempt worker without separately tracking OT.
• Excluding nondiscretionary bonuses, shift differentials, or commissions from the regular rate before multiplying by 1.5.

Can Overtime Ever Be Averaged Over Two Weeks?

Almost never. The FLSA carves out narrow exceptions:

• Hospital/residential care (29 USC §207(j)) — the "8 and 80" rule lets healthcare employers use a 14-day period instead of a workweek, paying OT for hours over 8 in a day OR over 80 in the 14-day period, *but only with a written agreement before the work is performed*.
• Firefighters and law enforcement (§207(k)) — public agencies may use a 7- to 28-day work period with different OT thresholds.
• Fluctuating workweek method (29 CFR §778.114) — allows a "half-time" overtime premium for salaried non-exempt workers with truly variable hours, but it still calculates OT week by week, not biweekly.

Outside of these specific exemptions, every private-sector employer must use a single 7-day workweek.

Biweekly Overtime by State

Several states layer additional rules on top of the federal weekly trigger — these still get applied per workweek, not averaged:

• California — Daily OT after 8 hours, double time after 12, plus 7th-consecutive-day rules. See our California overtime calculator.
• Nevada — Daily OT after 8 hours for workers under $18/hr. See Nevada calculator.
• Colorado — Daily OT after 12 hours OR after 12 consecutive hours. See Colorado calculator.
• Alaska — Daily OT after 8 hours for employers with 4+ employees.
• New York, Texas, Florida, Illinois — Follow the federal weekly 40-hour rule with no state daily threshold. See New York, Texas, Florida, and Illinois calculators.

How Biweekly Pay Periods Interact with 2026 Tax Rules

The One Big Beautiful Bill Act created an above-the-line deduction of up to $12,500 ($25,000 joint) for qualifying FLSA overtime premium pay through 2028. The deduction applies to the half-time premium (the 0.5× portion of time and a half), not the full OT wage. Biweekly payroll reporting doesn't change eligibility — but employers must separately box the OT premium on your W-2 starting tax year 2025.

See our 2026 no-tax-on-overtime guide and how overtime is taxed in 2026 for the full breakdown.

How to Spot and Recover Unpaid Biweekly Overtime

• . Pull your last 6 paystubs and timesheets. Map hours to the employer's stated workweek start day (check the employee handbook or ask HR in writing).
• . Total each workweek separately. Anything over 40 in a single week should appear as "OT" on the stub at 1.5× your regular rate.
• . Verify the regular rate. It must include nondiscretionary bonuses, shift differentials, and commissions — not just base hourly pay.
• . File a claim. You have 2 years (3 for willful violations) to file with the DOL Wage and Hour Division or your state labor agency. Most claims also support liquidated (double) damages.

Frequently Asked Questions

Is it illegal to calculate overtime biweekly?

Yes, for almost all private-sector employers. The FLSA requires overtime to be calculated on each fixed 7-day workweek independently. Averaging two weeks together to avoid paying time and a half violates 29 USC §207(a) and 29 CFR §778.104.

How do you calculate overtime for biweekly payroll?

Split the 14-day pay period into two 7-day workweeks based on your employer's posted workweek start day. Total hours in each week. Pay 1.5× the regular rate for every hour over 40 in each week individually, then add the two weeks together for the biweekly check.

Can my employer change the workweek to avoid overtime?

Only if the change is permanent, not designed to evade overtime, and is communicated in advance. A one-time shift to hide OT in a particular pay period is illegal under 29 CFR §778.105.

What if I work 45 hours one week and 35 the next?

You are owed 5 hours of overtime for the first week, even though your biweekly total (80 hours) doesn't exceed 80. The "extra" low-week hours cannot offset high-week overtime.

Does the "8 and 80" rule apply to me?

Only if you work in a hospital or residential care facility AND your employer has a written §207(j) agreement in place before the work is performed. Otherwise, the standard weekly 40-hour rule applies.

Are salaried biweekly employees entitled to overtime?

Yes, unless they qualify for a white-collar exemption (executive, administrative, professional, computer, outside sales) under the 2026 FLSA salary threshold. Salary alone never eliminates OT — see our exempt vs non-exempt guide.

How do bonuses affect biweekly overtime?

Nondiscretionary bonuses (production, attendance, safety) must be folded into the regular rate before multiplying by 1.5, then allocated back to each workweek in the bonus period. Our bonus overtime guide walks through the math.

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*Sources: U.S. Department of Labor Wage and Hour Division Fact Sheets #23 and #54, 29 USC §207, 29 CFR §§778.104–778.114, IRS Notice 2025-69 on the No Tax on Overtime deduction. Last reviewed June 4, 2026.*

Run your own numbers

Overtime is still owed week by week inside a biweekly period. The FLSA overtime calculator applies the workweek rule correctly, and the time and a half calculator prices the hours once you have the weekly split.