Does PTO Count Toward Overtime? How to Calculate a 12-Hour Shift Week With Paid Time Off

You put in for a PTO shift on Tuesday, then picked up an extra shift on Saturday to cover someone. When the stub lands, it lists 60 paid hours for the week, and you expected a big overtime line, because 60 minus 40 is 20. The overtime line shows 8 hours.

Nothing is necessarily wrong. The 40-hour line in federal overtime law is a count of hours worked. Hours you were paid but didn't work, like a PTO shift, don't move you toward it.

The rule: overtime counts hours worked, not hours paid

The federal overtime rule, in DOL Fact Sheet #23, is time-and-a-half the regular rate for hours worked over 40 in a workweek. Pay for time you did not work is treated separately. 29 CFR § 778.218 covers payments for occasional periods when no work is performed because of vacation, holiday, illness or a similar cause. Those payments can be left out of your regular rate, and they can't be credited as overtime pay owed. 29 CFR § 778.320 is the companion rule on time that is paid but isn't work: it doesn't count as hours worked unless an agreement or established practice treats it that way.

The practical result for a 12-hour-shift week:

1. Worked hours (shifts you actually staffed, including pick-ups and mandatory holdovers) are what count toward 40.
2. Paid-but-not-worked hours (PTO, a holiday you didn't work, sick leave) are paid at your normal rate but don't count toward 40.
3. Overtime premium = regular rate × 0.5 × worked hours over 40.

The premium is a half because the straight-time pay for every worked hour is already in the total. The paid leave hours get straight time too, but never a premium.

Worked week 1: a PTO shift plus three worked shifts

A nurse earns $40/hour. Scheduled: four 12-hour shifts. She uses PTO for one and works three.

• Worked hours: 3 × 12 = 36
• PTO hours: 12
• Paid hours: 36 + 12 = 48
• Overtime hours (worked over 40): none, because 36 is under 40
• Pay: 48 × $40 = $1,920.00

The belief "48 paid hours means 8 hours of overtime" would add 8 × $20 = $160. There isn't any overtime line, and under the federal rule that's correct: she worked 36 hours.

Worked week 2: a PTO shift, then a pick-up that crosses 40

Same nurse, same $40/hour. One PTO shift, three scheduled shifts, and one picked-up shift.

• Worked hours: 4 × 12 = 48
• PTO hours: 12
• Paid hours: 60
• Overtime hours: 48 − 40 = 8
• Straight-time pay: 60 × $40 = $2,400.00
• Overtime premium: 8 × ($40 × 0.5) = 8 × $20 = $160.00
• Total: $2,400 + $160 = $2,560.00

If PTO counted toward overtime, there would be 20 overtime hours and a $400 premium, a $2,800 week. The gap between the "hours paid" way of counting and the "hours worked" way is $240 for the week. Both stubs are plausible, which is why it's worth knowing which one federal law requires and which one your contract promises.

(These examples use a $40 flat rate and a weekly 40-hour threshold. If you also earn a differential or charge pay, build the regular rate first with the steps in overtime with two pay rates or shift differential vs. overtime.)

Quick reference: what counts toward the 40

Where your pay can still differ

• Your contract may count paid leave. The federal rule is a floor. A union agreement or written employer policy can say that PTO or holiday hours count toward overtime. If your contract says so, the contract controls, and the week 2 comparison above could land on the higher number.
• Your state may count differently. Some states calculate overtime by the day as well as the week, and a few have their own rules about how paid time off interacts with it. Daily overtime still counts hours worked that day; see 12-hour shifts and daily overtime.
• 8/80 and 7(k) schedules use different thresholds. Hospitals using an 8-and-80 arrangement, and fire or police on a 7(k) work period, measure overtime over a 14-day or longer period, not 40 in a week. The "worked, not paid" idea carries over; the threshold moves. See 8/80 for hospitals and 7(k) overtime.
• The workweek is whatever your employer set. A fixed 168-hour workweek determines which shifts fall into which week. If your week doesn't start Sunday, count your shifts by the employer's week; see employer-designated workweek.
• PTO is deducted in shift units. A 12-hour PTO shift costs 12 hours of your balance, not 8; see PTO in hours, not days.

What to check on your own stub

1. Split the week's hours into two piles: worked and paid-but-not-worked. Your timecard or schedule shows which shifts were PTO.
2. Subtract 40 from the worked pile only. If it's zero or negative, no federal overtime applies that week.
3. Compare the overtime line to your count. If the stub has more overtime than your math, your contract or policy may count leave, which is good news. If it has less than you expected, check the worked pile before suspecting an error.
4. Look up the contract language if the two differ: "hours paid" and "hours worked" are different phrases, and it matters which one your agreement uses.

Keeping a record of which shifts you worked and which were PTO makes step 1 a lookup instead of a memory test. Duty Pals, a shift calendar for Android, is now on Google Play, and the free shift pattern calculator on this site lays out a rotation against the calendar so you can count the shifts that fall in each workweek.

Pay rules vary by employer, state and union contract. This is a general explanation of the federal hours-worked baseline for overtime, not advice about your specific paycheck. Your written pay policy or contract, your state labor department and a licensed employment attorney are the authorities on your situation. Federal references: DOL Fact Sheet #23, 29 CFR § 778.218 and 29 CFR § 778.320.