What is a shift differential?
It is a premium on top of the base hourly rate for hours on a particular shift. Employers set it in a policy, an offer letter or a union contract: who gets it, for which hours, and how much.
| Type | Example | On a $20.00 base rate |
|---|---|---|
| Flat amount an hour | $2.00 an hour for hours after 6 p.m. | $22.00 an hour |
| Percentage of the base rate | 10% for the overnight shift | $22.00 an hour |
| Weekend or holiday premium | $3.00 an hour on Saturdays and Sundays | $23.00 an hour |
The Department of Labor says the Fair Labor Standards Act doesn't require extra pay for night work; it is a matter of agreement between employer and employee. If your policy, an offer letter or a union contract promises one, pay it as written.
Does shift differential count for overtime?
Yes. Federal regulation 29 CFR 778.207 says night shift differentials, whether a percentage or so many cents an hour, must be included in the regular rate before overtime is worked out. None of the differential counts as overtime pay itself.
Because the week then has hours at two rates, the regular rate is the weighted average (29 CFR 778.115): all straight-time pay, including the differential, divided by all hours worked. Overtime is half that rate again for each hour over 40, on top of the straight-time pay for every hour (29 CFR 778.110).
Worked example: a 46-hour week with night hours
An employee earns $20.00 an hour plus a $2.00 night differential. One week they work 46 hours, 16 of them on nights.
| Step | Figure |
|---|---|
| Straight time: 46 hours × $20.00 | $920.00 |
| Night differential: 16 hours × $2.00 | $32.00 |
| Straight-time pay | $952.00 |
| Regular rate: $952.00 ÷ 46 hours | $20.6957 |
| Overtime premium: 6 hours × half of $20.6957 | $62.09 |
| Total pay for the week | $1,014.09 |
Paying time and a half on the base rate alone ($30.00 for the 6 overtime hours) and the differential on top gives $1,012.00, which is $2.09 short. The gap is small in one week, but it adds up over a year and across a team, and it is the error the regulation is there to stop.
A percentage differential works the same way. If the night premium were 10% of $20.00, the 16 night hours would add the same $32.00 and the overtime would be the same.
Hazard pay and other premiums follow the same rule
The same regulation, 29 CFR 778.207(b), names other premiums that go into the regular rate: extra pay for hazardous, arduous or dirty work, and pay given as an incentive to finish work quickly. A lump sum paid for a job whatever the hours, such as 8 hours' pay for a job done in 6, also goes in.
- Add every such premium paid for the week to the straight-time pay before you divide by the hours.
- Only true overtime premiums, such as time and a half for hours over 40, stay out of the regular rate and count towards the overtime owed.
- A premium for one kind of shift and a different rate for a different kind of work can both appear in one week. The weighted average takes care of both.
How shift differential shows on a pay stub
Give the differential its own earnings line with the hours it covers, and show overtime as its own line too. Then the employee can check the premium and the overtime, and your payroll records show the additions to pay that the Department of Labor's recordkeeping rules ask for.
| Line | Hours | Rate | Amount |
|---|---|---|---|
| Regular pay | 46.00 | $20.00 | $920.00 |
| Night shift differential | 16.00 | $2.00 | $32.00 |
| Overtime premium | 6.00 | $10.3478 (half of $20.6957) | $62.09 |
| Gross pay | $1,014.09 |
Many stubs show the same week as 40 regular hours and 6 overtime hours at a higher rate. Either layout is fine if the total matches the weighted method. Shift differential is wages, so federal income tax, social security and Medicare are withheld on it like the rest of the paycheck.
In the PayDocs pay stub generator, enter the hours and base rate, then use "Add earnings line" for the differential and the overtime premium. PayDocs works out federal income tax, Social Security, Medicare and supported state taxes for 2026 pay dates (see what we calculate).
Sources: U.S. Department of Labor and 29 CFR 778.110, 778.115 and 778.207, read on October 8, 2026. State overtime rules can add to the federal ones. This page is general information, not legal or tax advice.
Questions
What is a shift differential?
Extra pay for hours on a less popular shift, such as evenings, nights or weekends. It is usually a set amount an hour, like $2.00, or a percentage of the base rate, like 10%, and it is shown on its own pay stub line.
Is shift differential required by law?
Not under federal law. The Department of Labor says the FLSA doesn't require extra pay for night work. It comes from the employer's policy, an offer letter or a union contract, and is paid as that agreement says.
Does shift differential count for overtime?
Yes. Under 29 CFR 778.207 it is part of the regular rate, so overtime is worked out on the weighted average of the base rate and the differential, not on the base rate alone.
How do you calculate overtime with a shift differential?
Add the straight-time pay for all hours and the differential, divide by the hours worked to get the regular rate, then add half that rate for each hour over 40. In the example, $952 ÷ 46 = $20.6957, and 6 overtime hours add $62.09.
Is shift differential taxed differently?
No. It is ordinary wages, paid with the rest of the paycheck, so federal income tax, social security and Medicare are withheld on it in the usual way.
Sources
- U.S. Department of Labor — Night work (work hours)
- eCFR — 29 CFR 778.207, Other types of contract premium pay distinguished
- eCFR — 29 CFR 778.115, Employees working at two or more rates
- eCFR — 29 CFR 778.110, Hourly rate employee
- U.S. Department of Labor — Fact Sheet #21: Recordkeeping requirements under the FLSA
Official sources checked October 8, 2026. This guide explains how pay documents work; it is not tax or legal advice.
