A shift differential is extra pay for working hours that are harder to staff, such as nights, weekends, holidays or rotating shifts. It is usually a flat amount per hour, like $2 extra, or a percentage of base pay, like 10%. One rule surprises many people: under federal overtime law, the differential counts toward your regular rate, so it raises your overtime pay too. A worker earning $20 an hour plus a $2 night differential for a 45-hour week is owed $1,045, not $1,040.
Is a shift differential required by law?
For most private-sector workers, no. The Fair Labor Standards Act sets minimum wage and overtime rules but does not require extra pay for night or weekend work. A shift differential comes from your employer’s policy, an employment contract or a union agreement.
Federal employees are a notable exception, because their pay rules are set by statute. The U.S. Office of Personnel Management explains that General Schedule employees receive night pay of 10% of their rate of basic pay for regularly scheduled work between 6 p.m. and 6 a.m.
How is a shift differential calculated?
Two common methods:
- Flat amount: base rate + fixed amount. $20 + $2 = $22 an hour for qualifying hours.
- Percentage: base rate × (1 + percentage). $20 × 1.10 = $22 an hour at a 10% differential.
Check whether it applies to every hour of a qualifying shift or only to hours inside a set window, such as after 11 p.m. Policies vary.
How does a shift differential affect overtime?
This is where mistakes happen. Under the FLSA, overtime is time and one-half of the “regular rate,” and federal regulation 29 CFR 778.207 says that extra pay for working undesirable hours, such as a shift differential, must be included in that regular rate. You cannot calculate overtime from base pay alone.
Worked example, all 45 hours at the night differential:
- Base rate: $20; differential: $2; regular rate: $22
- Straight-time pay for all hours: 45 × $22 = $990
- Overtime premium for hours over 40: 5 × ($22 × 0.5) = 5 × $11 = $55
- Total weekly pay: $990 + $55 = $1,045
If the employer wrongly used only the $20 base for overtime, the premium would be 5 × $10 = $50 and the week would come to $1,040, shorting the worker $5. Small per week, but it adds up over a year and across a workforce.
What if only some hours carry a shift differential?
When a worker has a mix of day and night hours, the regular rate is a weighted average: total straight-time earnings for the week divided by total hours worked. Say you work 30 day hours at $20 and 15 night hours at $22:
- Straight-time earnings: 30 × $20 + 15 × $22 = $600 + $330 = $930
- Regular rate: $930 ÷ 45 = $20.67 (rounded)
- Overtime premium: 5 × ($930 ÷ 45 ÷ 2) = 5 × $10.33 ≈ $51.67
- Total: $930 + $51.67 = $981.67
How is a shift differential taxed?
It is ordinary wages, taxed the same way as the rest of your paycheck. It is subject to federal income tax withholding, Social Security and Medicare, and usually state income tax.
Overtime is a separate question. The 2025 federal tax law created a deduction for a portion of qualified overtime pay for tax years 2025 through 2028, subject to income limits. The deduction generally covers only the half-time premium, so the overtime premium calculated from a regular rate that includes the differential matters here too. Estimate the effect with the overtime tax calculator.
How do you compare a night job with a day job?
Annualize the difference. A $2 differential on 40 hours a week for 50 weeks is $4,000 a year before tax. Then weigh it against costs such as childcare at odd hours or transportation. The shift differential calculator handles flat and percentage differentials and the overtime effect, and the salary tax calculator shows the take-home difference. The time card calculator helps you total day and night hours separately.
What should you check on your pay stub?
- That the differential appears for every qualifying hour
- That overtime is calculated from the regular rate including the shift differential, not base pay alone
- That a percentage differential uses your current base rate after any raise
- That paid holidays or leave are handled as your policy says
If something looks off, ask payroll in writing. If it is not fixed, the Department of Labor’s Wage and Hour Division handles FLSA overtime complaints.
How much is a typical shift differential?
There is no standard figure in federal law for private employers, so amounts come from the market, the employer and any union contract. Pay is often higher for overnight shifts than for evenings, and higher again for weekends or holidays. When you compare offers, ask three questions: is the shift differential a flat amount or a percentage, which hours exactly qualify, and does it apply to paid time off? A percentage grows with every raise, while a flat amount stays put unless the policy is updated, so over several years the percentage version is often worth more.
Can an employer change or remove a shift differential?
In most at-will jobs, yes, going forward, with notice. It cannot be removed retroactively for hours already worked, and a union contract may lock it in until renegotiation.
Sources
- eCFR: 29 CFR 778.207, other types of contract premium pay
- OPM: Night pay for General Schedule employees
- U.S. Department of Labor: Overtime pay
FAQ
What does “What Is Shift Differential Pay?” explain?
A shift differential is extra pay for working hours that are harder to staff, such as nights, weekends, holidays or rotating shifts. It is usually a flat amount per hour, like $2 extra, or a percentage of base pay, like…
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