An alternative work schedule is any arrangement that compresses your full-time hours into fewer or differently shaped workdays, most often by trading five 8-hour days for four 10-hour days or a nine-day, 80-hour fortnight. You keep the same weekly hours and base pay and pick up a recurring day off. Whether that switch triggers any legal process depends on where you work: under the federal Fair Labor Standards Act, overtime only kicks in after 40 hours in a workweek, so in most states an employer can offer a compressed schedule with no special approval. A handful of states impose daily overtime and require a formal adoption process. Federal government employees operate under their own statutory framework with voting and hardship rules built in.
The Two Common Configurations
The 4/10 is the simplest version. You work four days at ten hours each, hit 40 hours for the week, and take one full day off. Most employers pick a consistent day off across a department, though some rotate it.
The 9/80 is more technical. Over a two-week pay period you work eight days at nine hours and one day at eight, totaling 80 hours across nine workdays instead of ten, with a full day off every other week. The catch is that eight-hour day. Under the FLSA, a “workweek” is a fixed, recurring 168-hour block that can start on any day and at any hour.1eCFR. 29 CFR 778.105 – Determining the Workweek Employers running a 9/80 set the workweek to begin at the midpoint of the short day, splitting it into two four-hour halves that fall in separate workweeks. Without that split, one of the two workweeks would total 44 hours and trigger four hours of overtime. With the split, each workweek lands at exactly 40.
Getting the midpoint wrong is where 9/80 schedules fall apart in practice. If your employer starts the workweek at midnight Monday like a standard calendar week, the math doesn’t work. Payroll has to anchor the workweek start to the exact midpoint of your short day, and once locked in, the schedule has to stay fixed. Shifting the workweek around to dodge overtime is something federal regulators specifically watch for.
Overtime Under the FLSA
The FLSA requires overtime pay of at least one-and-a-half times your regular rate for every hour worked beyond 40 in a workweek.2Office of the Law Revision Counsel. 29 USC 207 – Maximum Hours That is the only overtime trigger at the federal level. The statute imposes no daily overtime requirement. You can work 12 hours on Monday and 12 on Tuesday, and as long as your total for the week stays at or below 40, no federal overtime is owed.3U.S. Department of Labor. Fact Sheet 23 – Overtime Pay Requirements of the FLSA
So in most states, moving to a 4/10 has no overtime consequences. You’re still working 40 hours. The FLSA treats compressed schedules as a matter of agreement between employer and employee and does not address flexible or compressed arrangements directly.4U.S. Department of Labor. Flexible Schedules No federal approval, no election, no filing. The employer and employee simply agree.
These rules only reach non-exempt (hourly) workers. If you’re an exempt salaried employee, FLSA overtime rules don’t apply regardless of your schedule, so a switch to a 4/10 or 9/80 is purely operational.
States That Require a Formal Adoption Process
A small number of states, including Alaska, California, Colorado, and Nevada, require overtime pay when you exceed a certain number of hours in a single day, not just in a workweek. California is the most prominent: time-and-a-half after eight hours in a day, double time after twelve. In those states, dropping someone into a 4/10 without going through the proper legal process would mean the employer owes two hours of daily overtime on every ten-hour day.
That’s why these states have formal alternative workweek procedures. When a compressed schedule is properly adopted under state law, the daily overtime threshold shifts upward to match the new schedule, typically from eight hours to ten. Work beyond ten hours but within twelve triggers time-and-a-half, and anything past twelve pays double time. Work on a day that isn’t part of the agreed schedule generally triggers premium pay too. The exact thresholds vary, so check your state labor agency for specifics.
In daily-overtime states, the adoption process is where the legal weight sits. Without a properly ratified schedule, your employer cannot avoid daily overtime just by calling your shift a “4/10.” The proposals, employee votes, and in some cases filings with the state labor department aren’t bureaucratic extras. They’re the mechanism that moves the overtime trigger.
Federal Government Employees
Federal employees operate under Title 5, which creates its own alternative work schedule framework separate from both the FLSA and state law. Federal law recognizes two categories: compressed schedules and flexible schedules.5Office of the Law Revision Counsel. 5 USC 6121 – Definitions A compressed schedule for a full-time federal employee means completing the standard 80-hour biweekly requirement in fewer than ten workdays. Flexible schedules keep the total hours the same but let you vary start and end times around a core set of hours when everyone must be present.
Implementation differs. Agencies can install flexible schedules unilaterally in non-union work units. Compressed schedules require more process: in a work unit without union representation, a majority of affected employees must vote in favor before the schedule takes effect.6Office of the Law Revision Counsel. 5 USC 6127 – Compressed Schedules Agencies Authorized to Use That’s a simple majority, more than half of the covered employees, not a supermajority. Where a union holds exclusive recognition, the agency must negotiate the schedule through collective bargaining rather than a general vote.7U.S. Office of Personnel Management. Handbook on Alternative Work Schedules
Federal law prohibits coercion in the voting process. No one, supervisors included, can threaten, promise benefits, or pressure you to vote a particular way on a compressed schedule proposal.8Office of the Law Revision Counsel. 5 USC 6132 – Prohibition of Coercion Employees who experience coercion can file a complaint with the Office of Special Counsel.
Overtime for federal employees on a compressed schedule kicks in for any officially ordered work beyond the scheduled hours. If your compressed schedule calls for ten-hour days, hours worked beyond ten in a day are overtime, as are hours beyond 40 in a week or 80 in a biweekly period.9U.S. Department of Commerce. Overtime Standards For FLSA-exempt federal employees, only hours management officially orders and approves count. For non-exempt employees, hours that are “suffered or permitted,” meaning your supervisor knew about them, can also qualify.7U.S. Office of Personnel Management. Handbook on Alternative Work Schedules
Holidays and Paid Leave
Holidays create a math problem on compressed schedules. If a federal holiday falls on your scheduled 10-hour workday, you get the full ten hours of holiday pay, not just eight.10U.S. Office of Personnel Management. Holidays Work Schedules and Pay If the holiday lands on your scheduled day off, you receive an “in lieu of” holiday, typically the preceding workday. For federal employees required to work on a holiday during their compressed schedule, holiday premium pay applies for the hours that overlap with the compressed work requirement, up to eight, nine, or ten hours depending on the schedule for that day.
Leave accounting works the same way. Take a vacation day on what would be a 10-hour workday and you burn ten hours of leave, not eight. Over a year, that means fewer full days off from the same leave balance. People switching to compressed schedules often don’t think about this tradeoff until they see their leave bank drain faster per day off than expected.
Private-sector holiday and leave policies on alternative schedules are set by the employer, not by statute. If your company offers eight hours of holiday pay but you’re on a 4/10, you may need to use two hours of paid time off or accept the pay gap for those hours. Check your employee handbook. This is one of the most common sources of confusion after a switch.
Hardship and Religious Accommodations
A compressed schedule doesn’t work for everyone, and the law accounts for that in a couple of ways.
For federal employees, any worker for whom a compressed schedule would impose a personal hardship must be either excluded from the schedule or reassigned.7U.S. Office of Personnel Management. Handbook on Alternative Work Schedules The statute doesn’t define “personal hardship,” but OPM guidance flags disability, caring for disabled family members, and childcare responsibilities as examples agencies should consider. You submit a written request and the agency evaluates it case by case. Flexible schedules generally don’t trigger the hardship exclusion because they already give you room to maintain a traditional schedule.
Separately, Title VII of the Civil Rights Act requires employers to make reasonable accommodations for employees whose sincerely held religious beliefs conflict with a work schedule, unless doing so would create substantial hardship for the business.11U.S. Equal Employment Opportunity Commission. Fact Sheet – Religious Accommodations in the Workplace If your compressed schedule puts you on a shift during a religious observance, your employer must explore alternatives such as adjusting your shift, swapping days, or finding another accommodation that doesn’t create an undue burden. The request doesn’t need to be in writing, and coworker complaints or customer preferences don’t count as legitimate hardship on the employer’s side.
Working or Traveling on Your Day Off
One of the most common points of friction with a compressed schedule is what happens when your employer needs you on your day off. If you’re a federal employee and you travel on a day outside your regularly scheduled workweek, the compensability rules depend on your FLSA status. For non-exempt employees, travel time on a non-workday is evaluated under both Title 5 and FLSA overtime provisions.7U.S. Office of Personnel Management. Handbook on Alternative Work Schedules For exempt employees, the agency applies its standard rules for crediting travel time outside the regular schedule. Agencies can also require you to revert to a traditional 8-hour, five-day schedule for any pay period in which you travel.
For private-sector employees, mandatory work on a scheduled day off is simply added to your weekly hours. If you’re on a 4/10 and your employer calls you in on your day off, those hours push you past 40 for the week and trigger FLSA overtime. In states with daily overtime, working on a day not included in your approved alternative schedule may also trigger premium pay for those hours from the first hour worked, depending on the state.
Ending or Changing the Schedule
Alternative schedules aren’t permanent. For federal employees, agencies can terminate a compressed or flexible schedule if it causes an “adverse agency impact,” meaning it increases costs, reduces productivity, or hurts service levels.7U.S. Office of Personnel Management. Handbook on Alternative Work Schedules
In states that require an employee election to adopt an alternative schedule, employees can generally petition to hold a new vote to repeal it. The petition and vote thresholds vary by state but typically require a waiting period after the original election before a repeal vote can occur. A successful repeal returns the work unit to the standard schedule.
Private-sector employers in states without daily overtime can change schedules more freely, since no statutory approval was needed to begin with. Your employer can typically adjust or end a compressed schedule with reasonable notice, subject to any employment contract or collective bargaining agreement. If you negotiated the schedule as a condition of employment, its removal might be a different conversation, but absent a written agreement, there’s usually no legal barrier to reverting to a standard five-day week.