Night differential is statutory extra pay for hours worked during a country's night window. Where a country sets a statutory night rate, and the employee works fixed hours, Outstaffer calculates it from their work schedule and bills it in advance on your subscription invoice as its own line, separate from base pay. Your monthly reconciliation then compares what was billed against actual payroll and settles the difference. This applies to invoices raised from 1 September 2026.
Why it is on the subscription invoice
This is where night differential was billed before Outstaffer's May 2026 billing migration. That migration moved it into the reconciliation, so it began reaching customers a month later as part of a variance. From 1 September 2026, it is back on the subscription invoice.
For an employee who works the same night hours every day, night differential is a fixed monthly cost rather than a variance, so it belongs with the other fixed costs. The cost of a night-shift hire is visible up front rather than a month behind, and the reconciliation carries only the items that genuinely move.
Which employees it applies to
It applies to employees who work fixed hours: the same start and finish time every working day, set on their Work Schedule.
It does not apply to employees on flexible arrangements, rotating rosters or variable hours. Their hours are not fixed in advance, so there is nothing to bill in advance. Their night differential is paid on the hours they actually work and settles in the reconciliation, as it does today.
How the amount is calculated
Outstaffer reads the Work Schedule on the employee's profile. Only employees on fixed hours have a schedule to calculate from.
The schedule times, which you enter in your company's time zone, are converted into the employee's local time zone.
The hours that fall inside that country's statutory night window are counted.
The country's statutory rate is applied to those hours only.
The result is converted to a monthly amount using standard working-day divisors.
The monthly amount uses standard working days rather than the specific calendar of the month ahead, which is the same basis used for other subscription lines.
Why your time zone and the employee's time zone both matter
Night differential is measured on the employee's local clock, not yours. A schedule that looks like a night shift to you can be a day shift where the employee is, and the reverse.
A company in US Eastern time with an employee in Manila:
11:00 AM to 7:00 PM Eastern is 11:00 PM to 7:00 AM in Manila, so 7 of the 8 hours fall in the 10 PM to 6 AM window.
11:00 PM to 7:00 AM Eastern is 12:00 PM to 8:00 PM in Manila, so none of the hours fall in the window.
US business hours are a night shift in Manila and attract the differential. A US overnight shift is a Manila day shift and attracts nothing.
Each employee's profile shows their schedule in both your time zone and theirs, matching the format on the Job Offer.
Worked example: Philippines
An employee in the Philippines on a monthly salary of PHP 60,000, working fixed hours of 11:00 PM to 7:00 AM Manila time.
The Philippines night window is 10 PM to 6 AM.
The shift overlaps the window from 11:00 PM to 6:00 AM, so 7 of the 8 hours qualify.
The Philippines statutory night differential is 10 percent.
Amount billed: 10 percent applied to 7 of 8 hours, which is 0.10 x 0.875 x PHP 60,000 = PHP 5,250 a month.
Worked example: Vietnam
An employee in Vietnam on a monthly salary of VND 30,000,000, working fixed hours of 11:00 PM to 7:00 AM Vietnam time.
The Vietnam night window is 10 PM to 6 AM, and the same 7 of 8 hours qualify.
The Vietnam statutory minimum night differential is 30 percent.
Amount billed: 0.30 x 0.875 x VND 30,000,000 = VND 7,875,000 a month.
Worked example: a shift that only partly overlaps
An employee in the Philippines on PHP 60,000, working fixed hours of 8:00 PM to 4:00 AM local time. The window is 10 PM to 6 AM, so the overlap runs 10:00 PM to 4:00 AM, which is 6 of the 8 hours.
Amount billed: 0.10 x 0.75 x PHP 60,000 = PHP 4,500 a month. The premium applies to the overlapping hours only, never to the whole shift.
Eligibility is settled at payroll, not in advance
The amount is calculated from the agreed schedule. Whether every one of those hours was actually payable is settled when payroll runs, the same way it is for base salary.
Where the premium turns out not to be payable, the amount is credited back to you through the reconciliation. That covers:
Hours not worked, because night differential is paid only for work actually rendered. Paid time off, unpaid leave and absence do not attract it.
Employees who are not entitled under local law. In the Philippines, night differential is a rank-and-file entitlement and managerial employees are not entitled to it. If a managerial employee's schedule produces a line, that amount is credited back.
A shift that changed during the month.
Am I being charged twice?
No. The subscription line is what was agreed, billed in advance. The reconciliation is what actually happened. Outstaffer compares the two line by line:
If the amount billed was higher than what payroll paid, including where the premium was never payable, the difference comes back to you as a credit note applied to that subscription invoice.
If it was lower, the difference appears on your debit invoice.
You pay once, for what was actually owed.
What stays in your reconciliation
Night differential for employees on flexible, rotating or variable hours.
Night overtime.
Night work on a weekly rest day or a public holiday.
Ad hoc night hours outside the agreed schedule.
Public holiday loading.
Any difference between what was billed and what payroll paid.
Good to know
Putting an employee onto fixed hours, or changing their fixed hours, changes their subscription cost from the next invoice.
Daylight saving shifts the overlap. Australia and New Zealand observe daylight saving. The Philippines, Vietnam, Thailand, Malaysia, Singapore and India do not. A US Eastern company with a Manila employee on fixed hours of 11:00 AM to 7:00 PM sees 7 qualifying hours during US summer time and 6 during US winter time, because the gap between the two time zones changes by an hour.
In the Philippines, night differential is a rank-and-file entitlement and is paid only for work actually rendered. A line may still appear for an employee who turns out not to be entitled, and it is credited back in the reconciliation.
Not every country has a statutory night differential. See Night Differential Rates by Country.