Shift Differential
A shift differential is extra pay for nights, weekends or holidays. How it works, how staffing agencies should bill it, and a calculator for pay and bill rates.September 24, 2026
5 min read
Payroll
Written by the NextCrew team
Definition
A shift differential is extra pay for working a less popular shift, such as nights, weekends or holidays, added to the base pay rate as a dollar amount or a percentage. For a staffing agency it is two decisions, not one: what the Crew Member earns for the shift, and what the client is billed for it.
How a night differential reaches the invoice
Shift differential calculator
Enter the base pay rate, the differential and your markup to see the shift pay rate and what to bill. It also shows what you lose if the differential is passed to the client at cost.
Your numbers
Per hour
Shift pay rate
$22.00
includes $2.00 differential
Bill rate, differential marked up
$31.90
Bill rate, differential at cost
$31.00
Margin, marked up
$5.50
Margin, at cost
$4.60
Overtime rate if every hour this week carries the differential
$33.00
Estimates only. Margin is after burden. Weeks that mix differential and regular hours use a weighted regular rate for overtime. Not legal or payroll advice.
How does shift differential pay work?
The differential is added to the base pay rate for the hours that qualify, as a flat amount or a percentage. Qualifying hours are usually evenings, overnights, weekends and holidays. Agencies often match what the client pays its own staff for the same shift, so the Crew Member is not paid less than the employee next to them.
| Type | Example on a $20.00 base | Shift pay rate |
|---|---|---|
| Flat amount | +$2.00 per hour for overnight hours | $22.00 |
| Percentage | +10% of base for overnight hours | $22.00 |
| Weekend | +$1.50 per hour on Saturday and Sunday | $21.50 |
Example rates only.
Is shift differential pay required by law?
No federal law requires it, but once you pay it, it counts toward overtime. The U.S. Department of Labor states that the Fair Labor Standards Act does not require extra pay for night work; a differential is set by agreement. When one is paid, it must be included in the regular rate used to calculate overtime (DOL Fact Sheet #54). Some states and union agreements have their own rules, so check where your Crew Members work.
How should a staffing agency bill a shift differential?
Mark the differential up like the rest of the pay, because burden applies to it too. If the differential is passed to the client at cost, the agency still pays payroll taxes and workers' comp on the extra pay, with nothing billed to cover them. In the calculator's default example, billing the $2.00 differential at cost leaves $4.60 an hour instead of $5.50. Agree three things with the client in writing: which hours qualify, the differential amount, and whether it is billed at your markup.
Where agencies get shift differentials wrong
Most mistakes come from treating the differential as a payroll item and forgetting the invoice.
- Leaving it out of the overtime rate. The differential is part of the regular rate, so overtime on those weeks is paid at one and a half times the higher rate.
- Billing it at cost. The extra pay carries burden like any other pay. Billed without markup, it quietly lowers the margin on every differential hour.
- Paid but never billed. Payroll adds the differential and the invoice does not, because the rate was agreed by phone and never set up for the client.
- No clear qualifying hours. A shift from 6pm to 2am crosses two rules. Decide in advance which hours qualify so payroll and billing match.
Bottom line: set the differential, the qualifying hours and the billed rate before the first night shift, and include the differential in overtime.
How NextCrew handles shift differentials
NextCrew keeps premium pay and premium billing tied together.
- Shift differential calculation can be switched on in NextCrew's permission settings.
- Pay codes carry their own bill rates and overtime rules, so premium hours are billed at premium rates rather than the regular rate.
- Overtime is calculated from your jurisdiction and overtime settings, applied by where each Crew Member works.
- Holiday pay follows a company holiday schedule with client-level overrides, driving both pay and bill.
See how pay and billing connect in payroll software for staffing agencies.
Frequently asked questions
Related terms
- Bill rate: what the client pays per hour, including any differential.
- Markup: the percentage that should apply to the differential too.
- Burden rate: the employer costs that also apply to differential pay.
- Overtime: pay at one and a half times the regular rate, which includes the differential.
- Split shift: a workday broken by an unpaid gap, with its own premium rules.
- Double time pay: twice the regular rate for certain overtime hours.
- Swing shift: the afternoon-to-evening shift that often carries a differential.
- Holiday pay: premium pay for holiday hours.