Biweekly pay does not mean overtime starts after 80 hours
Compare 46/34 and 40/40 workweeks, separate paid leave from worked hours, and reconcile weekly overtime with a two-week paycheck.
A paycheck may cover two weeks while federal overtime is calculated one workweek at a time. Looking only at the total hours on the paycheck can hide overtime that should have been recognized in one of those weeks.
This guide uses the ordinary FLSA rule for covered, nonexempt employees. Certain healthcare, public safety, and other arrangements have specific statutory methods; the calendar examples below should not replace those rules.
Find the employer's actual workweek boundary
DOL describes a workweek as a fixed, recurring 168-hour period. It can start on a day and time other than Monday at midnight. Under the ordinary rule, hours from separate workweeks are not averaged to avoid overtime.
Ask payroll for the boundary in writing if your timesheet does not show it. A shift that crosses midnight is not automatically split into two workweeks; the relevant question is whether it crosses that established boundary. Marking the boundary on your own calendar prevents you from mixing hours that belong to different weekly calculations.
Two 80-hour pay periods can produce different pay
Consider a worker paid $26 per hour with no bonuses or differentials. In the first pay period, the worker records 46 actual hours in week one and 34 in week two. In the second, the worker records 40 hours in each week. Both pay periods contain 80 worked hours, but only the first includes hours above 40 within a single week.
This comparison is useful when a payroll screen shows a two-week total of 80 and a separate overtime line. That overtime line is not necessarily a duplication. The worker earned 80 hours of straight-time wages plus an additional premium for six hours in the longer week.
Original example: 46 + 34 compared with 40 + 40
- Week one: (40 × $26) + (6 × $39) = $1,274.
- Week two: 34 × $26 = $884.
- Two-week gross: $1,274 + $884 = $2,158.
- Federal premium within that total: 6 × $26 × 0.5 = $78.
- Two 40-hour weeks instead: 80 × $26 = $2,080.
Do not treat every paid hour as a worked hour
Use a separate column for paid leave, holidays not worked, and actual work. The FLSA hours-worked rules also address short breaks, meal periods, waiting, training, and travel; the name of a timesheet category alone does not decide whether time counts.
For example, 36 hours actually worked plus eight hours of paid vacation gives 44 paid hours. That is not the same record as 44 hours actually worked. Conversely, leaving required work off the timesheet does not make it disappear. If you believe work time was omitted, preserve the schedule and raise the timekeeping issue before estimating the premium.
Sources: DOL Fact Sheet 22: hours worked
Reconcile hours first, rates second, payment dates third
Start with a weekly table and check that each shift appears once. Next calculate the regular rate for that week; a bonus or a different job rate can make a single advertised hourly rate insufficient. Finally, match each weekly amount to the pay period in which payroll paid it.
For a semimonthly paycheck, the same discipline matters even more. A period ending on the 15th can cut through a workweek. Keep the complete workweek calculation intact in your records, then document how its pay was allocated across statements. Do not invent a new overtime threshold simply because the pay period is longer or shorter than two weeks.
- Write the workweek start day and time at the top of the sheet.
- Keep worked hours and paid nonwork time in separate columns.
- Use one row per week, with rate changes or adjustments noted.
- Explain carryovers instead of counting the same shift twice.
Convert the weekly premium into a careful annual estimate
In the 46/34 example, $78 is the modeled federal premium, not the entire $234 paid for six overtime hours. If that exact pattern repeats for ten pay periods, the arithmetic estimate is $780. If the schedule changes, calculate the actual weeks instead of projecting the busiest week across the whole year.
Maintain an actual-to-date total plus a separately labeled forecast. At year end, reconcile the payment-year total with the employer's reporting before calculating a deduction. For 2026, qualified overtime is separately reported using W-2 code TT; a timesheet is a useful cross-check, not a replacement for the reporting rules.
The timesheet calculator can help add the hours, and the pay calculator can help explain gross wages. Neither determines whether every break, training session, or employment classification in your particular situation satisfies the law. Use the underlying records and ask payroll to explain disputed classifications.
Official sources
Sources checked for this guide on 2026-09-29. A review date is not a guarantee that a rule will remain unchanged; check the applicable tax-year instructions before acting.
Put the explanation to work
- Total your workweek hours
- Calculate gross overtime pay
- Estimate your overtime deduction and federal tax savings
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