Guide
What Is Shift Differential Pay?
A shift differential is extra pay for working a less popular shift, such as evenings, nights, weekends or rotating schedules. It's usually a fixed amount per hour (for example +$2.00) or a percentage of the base rate (for example +10%). No US federal law requires it, but when it's paid, federal law does require it to be included in your regular rate, so it raises your overtime pay as well.
Common types of differential
| Type | Example | On a $20.00 base |
|---|---|---|
| Flat amount per hour | +$2.00 for hours after 6:00 PM | $22.00 an hour |
| Percentage of base rate | +10% on night shifts | $22.00 an hour |
| Flat amount per shift | +$25 per overnight shift | $25 extra for that shift |
| Weekend or holiday premium | +$3.00 on Saturday and Sunday | $23.00 an hour |
Which hours qualify depends on the employer's policy or union contract. Some pay the differential for every hour of a qualifying shift; others only for the hours that fall inside a set window, such as 11:00 PM to 7:00 AM. Check the wording, as it changes the number of hours you get it for.
Calculating the pay
differential pay = qualifying hours × differential per hour
percentage differential per hour = base rate × percentage
Example. A night-shift worker earns $20.00 an hour plus a $2.00 differential for 24 qualifying hours a week: 24 × $2.00 = $48.00 a week. Over a year that's 24 × $2.00 × 52 = $2,496 on top of base pay, which is worth knowing when you compare a night job with a day job.
Differentials and overtime
This is where pay stubs often go wrong. Under the Fair Labor Standards Act, the regular rate used for overtime must include "such extra premiums as nightshift differentials (whether they take the form of a percent of the base rate or an addition of so many cents per hour)" (29 CFR §778.207(b)). So in any week with overtime, the overtime rate isn't just 1.5 × your base rate.
Use the same method as for overtime with two pay rates:
- Add all straight-time pay for the week: base pay for every hour, plus all differential pay.
- Divide by total hours worked to get the regular rate.
- Pay half the regular rate on top for each overtime hour.
Worked example
The worker above puts in 46 hours one week, 24 of them qualifying for the $2.00 night differential:
- Straight-time pay: 46 × $20.00 + 24 × $2.00 = $920.00 + $48.00 = $968.00
- Regular rate: $968.00 ÷ 46 = $21.0435 an hour
- Overtime premium: 6 × 0.5 × $21.0435 = $63.13
- Gross pay: $968.00 + $63.13 = $1,031.13
If the employer leaves the differential out of the overtime rate, the premium is 6 × 0.5 × $20.00 = $60.00 and gross pay is $1,028.00, which is $3.13 short. That's a small amount for one week, but it adds up over a year of regular overtime.
The overtime premium in this method is based on the average rate for the week, not on whether the overtime hours themselves were night or day hours.
What the law requires, by country
- United States: no federal requirement to pay a differential; if one is paid, it goes into the regular rate. Some states and many union contracts have their own rules, especially in healthcare and public-sector work.
- Canada (Ontario): no general shift-premium requirement in the Employment Standards Act; differentials come from contracts and collective agreements.
- United Kingdom: no legal requirement to pay more for nights or weekends; any premium is contractual. Regular premiums can count toward holiday pay (see UK overtime pay rules).
- Australia: modern awards commonly set penalty rates for evenings, nights, weekends and public holidays. Check the award that covers your job.
Is a differential taxed differently?
No. In the US, differential pay is ordinary wages, subject to the same income tax withholding and FICA as base pay. A bigger paycheck can look over-withheld, for the same reason overtime does; see is overtime taxed more?
Calculate it
Work out your regular rate with the steps above, then enter it in the Overtime Calculator to split regular and overtime pay. The Hourly Pay Calculator shows what a differential is worth per month and per year, and the Paycheck Calculator estimates the take-home.