Night differential, Sunday premium, and holiday pay are the three most common premium pays outside overtime itself. Each has its own statutory authority, its own eligibility conditions, and its own interaction with the biweekly premium pay cap. They can stack — a Sunday night shift on a holiday produces multiple premiums simultaneously — but the stacking is governed by specific rules that agencies sometimes apply incorrectly. Employees in positions with regularly scheduled non-standard hours should understand the rules well enough to confirm their pay stubs are correct; small misapplications can compound into meaningful annual amounts.
The rules are old. Night differential at 10 percent dates to the mid-20th century. The Sunday premium structure has been stable for decades. Holiday premium rules are set in 5 U.S.C. 5546(b) with implementing details in 5 CFR 550.131. What has changed over time are specific edge cases: the 1999 appropriations act restriction on Sunday pay for leave hours, periodic updates to holiday designations, and adjustments to how alternative work schedule employees interact with holiday rules. This article covers the current state as of 2026.
The phrase "regularly scheduled" governs almost every premium pay eligibility question. Night differential applies only to regularly scheduled nightwork. Sunday premium applies only to regularly scheduled Sunday work. Holiday premium applies only to regularly scheduled basic tours of duty that fall on a holiday. Unscheduled call-ins, voluntary overtime, and ad hoc shift extensions do not produce these premiums — they produce overtime. The distinction between a regularly scheduled shift and an unscheduled call-in is the single most important test an employee should apply when evaluating whether a specific pay period's premium pay is correct. If the work was on the agency-published schedule before the administrative workweek began, it is regularly scheduled. If it was added during the week, it is unscheduled.
Section I Night differential — 10 percent
Night differential under 5 U.S.C. 5545(a) compensates General Schedule employees for regularly scheduled work performed during the night window.
The 10 percent rate
The differential is 10 percent of the employee's rate of basic pay, applied to each hour of regularly scheduled work performed between 6:00 p.m. and 6:00 a.m. The differential is a percentage added to the hourly rate for those specific hours, not a flat fee. Employees at higher grades receive proportionally higher dollar amounts because the 10 percent is calculated on the higher base.
What qualifies as nightwork
Under 5 U.S.C. 5545(a), nightwork is regularly scheduled work between 6:00 p.m. and 6:00 a.m. The work must be officially scheduled as part of the employee's regular tour of duty before the administrative workweek begins. Unscheduled call-ins during the night window do not qualify for night differential — they are compensated as overtime.
Partial shifts
The differential applies only to the specific hours worked during the night window, not to the entire shift. An employee working 4:00 p.m. to midnight on a regularly scheduled shift receives night differential only for the hours worked between 6:00 p.m. and midnight (6 hours), not for the entire 8-hour shift.
Leave hour treatment
Night differential is paid for periods of paid leave during regularly scheduled nightwork, but only when total paid leave during the pay period stays under 8 hours. Once the employee crosses 8 hours of paid leave in a biweekly pay period, night differential stops for any additional leave hours. Employees in non-pay status receive no night pay for leave hours. Night differential is also paid during holiday excused absence that falls within regularly scheduled nightwork.
Credit hours and night pay
Credit hours earned or used during night hours do not generate night differential. Under 5 U.S.C. 5545(a) and OPM regulations, employees must generally perform actual work at night to earn night pay. When an employee uses credit hours at night to be absent from regularly scheduled nightwork, no night pay is paid for those hours.
Federal Wage System employees
Blue-collar employees under the Federal Wage System operate under a different structure at 5 U.S.C. 5343(f): 7.5 percent differential for shifts between 3:00 p.m. and midnight, and 10 percent for shifts between 11:00 p.m. and 8:00 a.m., when the majority of the shift falls within those windows. Unlike GS night pay, the FWS night shift differential is considered part of basic pay, which means it factors into retirement and other pay-based calculations.
Section II Sunday premium — 25 percent
Sunday premium under 5 U.S.C. 5546(a) applies to regularly scheduled, non-overtime work performed on Sunday.
The 25 percent rate and the full-shift rule
Under 5 U.S.C. 5546(a), an employee is entitled to pay at the basic rate plus 25 percent for work performed during a regularly scheduled, non-overtime, basic 8-hour period of service, any part of which is performed on Sunday. Critical detail: the premium applies to the entire shift, not just the Sunday hours. Even if only two hours of an 8-hour shift fall on Sunday and the rest continue into Monday, Sunday premium is paid for the entire 8-hour tour.
Three required conditions
Sunday premium eligibility requires all three: the work must be regularly scheduled (not voluntary or unscheduled); the hours must be non-overtime basic hours (overtime on Sunday is paid as overtime, not as Sunday premium); and the employee must actually perform work on Sunday. The third requirement is the 1999 appropriations restriction.
The 1999 appropriations restriction
Section 624 of the Treasury and General Government Appropriations Act, 1999, and subsequent appropriations laws have prohibited Sunday premium pay for hours during which the employee did not actually work. Leave, compensatory time, credit hour usage, or other non-work Sunday hours do not qualify for the 25 percent premium. The restriction does not affect basic pay for those hours — the employee still receives regular pay — but the premium does not attach to non-work hours.
Overseas variation
For employees serving outside the United States in areas where Sunday is a routine workday and another day is officially recognized as the day of rest and worship, the Secretary of State may designate the officially recognized day of rest for Sunday premium purposes. In those jurisdictions, the premium applies to the officially recognized day of rest rather than to Sunday specifically.
Sunday overtime
Work performed on Sunday that qualifies as overtime (over 8 hours in a day or over 40 in a week) is paid as overtime, not as Sunday premium. An employee who works a regularly scheduled 8-hour shift on Sunday plus 2 hours of overtime receives Sunday premium for the 8 basic hours and overtime pay for the 2 overtime hours.
Section III Holiday pay and holiday premium
Federal holiday pay has two distinct components: regular pay for excused holidays, and premium pay for holiday work.
The 11 designated federal holidays
Under 5 U.S.C. 6103, eleven federal holidays are designated: New Year's Day, the Birthday of Martin Luther King Jr. (third Monday in January), Washington's Birthday (third Monday in February), Memorial Day (last Monday in May), Juneteenth National Independence Day (June 19), Independence Day (July 4), Labor Day (first Monday in September), Columbus Day (second Monday in October), Veterans Day (November 11), Thanksgiving Day (fourth Thursday in November), and Christmas Day (December 25). Inauguration Day (January 20 every four years) is an additional paid holiday for federal employees in the Washington-Baltimore commuting area.
In-lieu-of rules
When a designated holiday falls on a Saturday, the preceding Friday is typically observed as the in-lieu-of holiday. When it falls on a Sunday, the following Monday is observed. These in-lieu-of determinations affect which specific day receives holiday premium pay and excused absence treatment. Executive orders and agency policies may modify in-lieu-of observance in specific circumstances, particularly for employees on alternative work schedules.
Excused holiday absence
Employees who are not required to work on a holiday receive their rate of basic pay for the holiday hours — typically 8 hours for full-time employees. This is not premium pay; it is regular pay for hours the employee did not work. Employees on leave status the day before or after a holiday (in specific patterns) may have different treatment; individual agency policy and 5 CFR Part 630 govern.
Holiday premium pay for work
Under 5 U.S.C. 5546(b), employees required to work on a holiday receive their rate of basic pay plus holiday premium pay equal to the rate of basic pay for each hour of holiday work. The practical result is effectively 2× pay for holiday hours worked — the employee earns both the excused-day basic pay and the premium pay at 100 percent of the basic rate for the same hours. Holiday premium pay applies during regularly scheduled non-overtime basic tours of duty, not to exceed 8 hours.
The 2-hour minimum
Under 5 U.S.C. 5546(c) and 5 CFR 550.131(c), employees required to perform any work during basic non-overtime holiday hours are entitled to a minimum of 2 hours of holiday premium pay. An employee called in for 30 minutes of holiday work receives 2 hours of premium pay regardless of actual duration.
Alternative work schedules
Employees on flexible work schedules are entitled to holiday premium pay if they are required to work during the hours of their "basic work requirement" (non-overtime hours) on a holiday, not to exceed 8 hours. When the President issues an executive order granting a half-day holiday, part-time employees on flexible schedules are entitled to holiday premium pay for work during the last half of their basic work requirement, not to exceed 4 hours.
Section IV The "regularly scheduled" rule
The phrase "regularly scheduled" is the most important operational test for all three premium pays. GAO guidance and OPM regulations interpret it consistently.
What regularly scheduled means
Regularly scheduled work is work included in the employee's approved tour of duty established before the administrative workweek begins. The tour of duty is the schedule of work hours the employee is expected to work during the pay period. If work is on the tour of duty, it is regularly scheduled.
What regularly scheduled does not include
Call-ins for emergency work during off-duty hours are not regularly scheduled. Voluntary shift swaps arranged after the administrative workweek begins are typically not regularly scheduled. Ad hoc extensions of a shift added during the workweek are not regularly scheduled. These are compensated as overtime rather than as premium pay.
Why the distinction matters
An employee who works a regularly scheduled Sunday 6:00 p.m. to 2:00 a.m. shift receives: regular basic pay for all 8 hours, Sunday premium (25 percent) on all 8 hours, and night differential (10 percent) on 6 hours (from 8:00 p.m. to 2:00 a.m.). The same employee called in for unscheduled Sunday 9:00 p.m. to 1:00 a.m. work receives: overtime pay for all 4 hours (with the GS-10 cap if exempt), no Sunday premium, and no night differential. The same physical work pattern produces materially different total compensation depending on whether it was scheduled or unscheduled.
When agencies modify the tour
Agencies can change an employee's regularly scheduled tour of duty for legitimate business reasons, typically with advance notice. Once the new tour is established, the new schedule is "regularly scheduled" for premium pay purposes. Employees whose tours of duty have been modified should confirm the change is documented in writing to ensure correct premium pay application.
Section V Stacking and interactions
The three premium pays can stack — but under specific stacking rules.
Night plus Sunday
Under 5 U.S.C. 5546(e), night pay is paid in addition to Sunday premium pay. An employee working a regularly scheduled Sunday night shift receives both the 25 percent Sunday premium on the full shift and the 10 percent night differential on the hours actually worked within the 6:00 p.m. to 6:00 a.m. window.
Night plus holiday
Under 5 CFR 550.122(c), night pay is paid in addition to holiday premium pay. Night pay also applies when an employee is excused from regularly scheduled nightwork during holiday hours — the employee receives basic pay plus night pay even though no actual work is performed during the excused holiday hours.
Sunday plus holiday
Under OPM fact sheet guidance, an employee required to work during holiday hours on Sunday is entitled to both holiday premium pay and Sunday premium pay if Sunday work is part of the employee's regularly scheduled basic workweek. If the employee does not actually work during the holiday hours on Sunday, the employee receives basic pay for the holiday hours but is not entitled to Sunday premium (because Sunday premium requires actual work under the 1999 appropriations restriction).
Three-way stacking
A regularly scheduled Sunday night shift that falls on a federal holiday produces all three premiums simultaneously: basic pay for all hours, holiday premium (100 percent) for holiday hours worked, Sunday premium (25 percent) on the full shift, and night differential (10 percent) on night hours actually worked. The employee's gross hourly rate for each hour of work during that shift can exceed 235 percent of the regular hourly rate, subject to the biweekly premium pay cap.
Overtime on top
If the holiday/Sunday/night shift includes overtime hours, those overtime hours are paid as overtime under Title 5 or FLSA rules, not as premium pay. Overtime stacks with night differential under 5 CFR 550.122(c) but not with Sunday or holiday premium (which apply only to non-overtime hours).
Section VI Who is not entitled to these premiums
Certain categories of federal employees are excluded from night, Sunday, or holiday premium pay under specific statutory or regulatory provisions.
Standby duty employees
Employees receiving annual premium pay for standby duty under 5 U.S.C. 5545(c)(1) are not entitled to separately paid Sunday, holiday, or night pay for hours covered by the standby premium. Standby duty pay applies in lieu of overtime for regularly scheduled overtime hours, Sunday pay for Sunday work within the basic workweek, holiday premium pay for holiday work, and night pay for nightwork. The standby premium (up to 25 percent of basic pay) effectively rolls up the separate premiums.
Firefighters under 5 U.S.C. 5545b
GS-0081 firefighters whose regular tours of duty average at least 106 hours per biweekly pay period are covered by special rules at 5 U.S.C. 5545b. These firefighters are not entitled to paid holiday time off or holiday premium pay, do not receive separate Sunday or night premiums, and operate under a special hourly rate and overtime rate system. See 5 CFR 550.1306(a).
SES and certain senior positions
Members of the Senior Executive Service are not entitled to the premium pays described in this article. SES compensation includes the expectation of full availability and does not carry separate premium pay entitlements. Certain other senior positions may have similar exclusions depending on the specific appointment authority.
Intermittent employees
Employees with an intermittent work schedule are not entitled to paid holiday time off or holiday premium pay. Intermittent schedules lack the "regularly scheduled" tour of duty that triggers these entitlements. Part-time employees with regularly scheduled tours do qualify, subject to the proportional rules in 5 CFR Part 610.
Administratively Uncontrollable Overtime (AUO)
Employees receiving AUO under 5 U.S.C. 5545(c)(2) — compensation for irregular overtime hours in positions where hours cannot be controlled administratively — receive a separate premium (up to 25 percent) that interacts with other premium pays under the specific AUO rules. AUO is common in law enforcement and investigative positions.
Section VII Cap interactions and biweekly ceiling
All three premium pays are subject to the biweekly premium pay cap under 5 U.S.C. 5547 and 5 CFR 550.105.
The biweekly cap
Under 5 U.S.C. 5547(a), the total of basic pay plus all premium pay (including Title 5 overtime, night pay, Sunday premium, holiday premium, and standby or AUO pay) cannot exceed, in any biweekly pay period, the greater of: the biweekly rate for GS-15 step 10 at the employee's locality, or the biweekly rate for Executive Schedule Level V. For detailed mechanics of the cap, see our Career & Pay guide on overtime, compensatory time, and premium pay.
FLSA overtime exclusion
FLSA overtime pay and FLSA compensatory time off are excluded from the premium pay definition and are not subject to the biweekly cap. FLSA-nonexempt employees can exceed the premium pay cap through FLSA overtime — though night differential, Sunday premium, and holiday premium remain subject to the cap for nonexempt employees.
Annual cap exception
Under 5 U.S.C. 5547(b), for employees performing emergency work or mission-critical work (as determined by the agency head or OPM), premium pay may be subject to an annual cap rather than the biweekly cap. This applies during disaster response, national emergencies, and specific mission-critical operations where concentrated premium pay would otherwise hit the biweekly cap. The annual cap is the greater of: the annual rate for GS-15 step 10 at the employee's locality, or the annual rate for Executive Schedule Level V.
When the cap matters
For most federal employees at GS-11 and below, premium pay does not approach the biweekly cap. For employees at GS-13 through GS-15 in positions with frequent night, Sunday, or holiday work, the cap can constrain actual earnings in high-premium weeks. Employees who regularly see premium pay constrained by the cap should discuss with their payroll office whether the annual cap exception could be invoked for their position.
What to verify on your next LES
- Confirm night differential (10%) is calculated only on hours actually worked between 6:00 p.m. and 6:00 a.m., not on the full shift.
- Confirm Sunday premium (25%) applies to the entire 8-hour tour when any part falls on Sunday, provided you actually worked.
- Confirm you received the 2-hour minimum holiday premium pay if you worked any portion of a holiday.
- Confirm premium pays stacked correctly on Sunday or holiday nightwork — night plus Sunday, night plus holiday, Sunday plus holiday, and the three-way combination when applicable.
- If your premium pay appears to have been capped, confirm which cap (biweekly or annual) was applied and whether the limit was correctly computed using your locality rate.
Section VIII Frequently asked questions
Under 5 U.S.C. 5545(a), night pay is a 10 percent differential paid to General Schedule employees for regularly scheduled work performed between 6:00 p.m. and 6:00 a.m. The differential applies only to hours actually worked during the night window; it does not apply to the entire shift if only part of the shift falls within the night period. Night pay also applies during paid leave hours that fall within regularly scheduled night work, but only when total paid leave in the pay period stays under 8 hours. Federal Wage System (blue-collar) employees operate under a different night shift differential structure — 7.5 percent for 3:00 p.m. to midnight shifts and 10 percent for 11:00 p.m. to 8:00 a.m. shifts when the majority of hours fall in those windows, and that differential is part of basic pay.
Under 5 U.S.C. 5546(a), Sunday premium pay is 25 percent of the employee's rate of basic pay for work performed during a regularly scheduled, non-overtime, basic 8-hour tour of duty, any part of which is performed on Sunday. Three conditions must all be met: the work must be part of a regularly scheduled tour (not voluntary or unscheduled), the shift must be non-overtime basic hours (overtime work on Sunday is paid as overtime, not Sunday premium), and the employee must actually perform work. Since FY 1999, appropriations language has prohibited Sunday premium pay for hours during which the employee did not work — leave hours on Sunday do not qualify for the premium.
Under 5 U.S.C. 5546(b), employees required to work on a designated federal holiday receive holiday premium pay equal to their rate of basic pay for each hour of holiday work — effectively double time (200 percent) when combined with the regular pay for holiday hours. A minimum of 2 hours of holiday premium pay applies under 5 U.S.C. 5546(c) for any work performed during basic non-overtime holiday hours. Holiday premium pay applies during regularly scheduled non-overtime basic tours of duty, not to exceed 8 hours. Employees who are excused from work on a holiday receive their regular pay for those hours (up to 8 hours) without working. Federal standby duty employees under 5 U.S.C. 5545(c)(1) and certain firefighters under 5 U.S.C. 5545b are not entitled to holiday premium pay.
Yes, under specific rules. Under 5 U.S.C. 5546(e) and 5 CFR 550.122(c), night pay is paid in addition to Sunday pay, holiday premium pay, or overtime pay when the employee performs work that qualifies for both. An employee working a Sunday night shift on a holiday can receive holiday premium plus Sunday premium plus night differential — all stacked on basic pay. The biweekly premium pay cap under 5 U.S.C. 5547(a) still applies to the total, so high-premium weeks for higher-graded employees can hit the GS-15 step 10 ceiling. Night pay also applies during excused holiday hours if the holiday falls during regularly scheduled nightwork.
Eleven federal holidays are designated by 5 U.S.C. 6103: New Year's Day (January 1), Birthday of Martin Luther King Jr. (third Monday in January), Washington's Birthday (third Monday in February), Memorial Day (last Monday in May), Juneteenth National Independence Day (June 19), Independence Day (July 4), Labor Day (first Monday in September), Columbus Day (second Monday in October), Veterans Day (November 11), Thanksgiving Day (fourth Thursday in November), and Christmas Day (December 25). When a designated holiday falls on a weekend, in-lieu-of rules determine which weekday is observed as the federal holiday for pay and premium pay purposes. Inauguration Day (January 20 every four years) is an additional paid holiday for federal employees in the Washington-Baltimore commuting area.