Summary
Part time is generally any schedule under the employer's full-time standard, and in the United States that means different numbers for different purposes. The Bureau of Labor Statistics defines part time as 1 to 34 hours a week. The Affordable Care Act treats employees averaging under 30 hours a week (130 a month) as not full time, which is the threshold most employers use because it decides health-coverage obligations. Company policies commonly set part time at 20 to 29 hours. The Fair Labor Standards Act has no definition at all: a part-time employee is owed minimum wage and overtime over 40 hours like anyone else. Other thresholds matter for benefits: 1,000 hours a year for traditional 401(k) eligibility, 500 hours in two consecutive years for long-term part-time employees since 2025, and 1,250 hours in 12 months for FMLA leave.
Part-time thresholds are averages of actual hours, so the record has to be accurate. E-Monitor's time tracking captures hours automatically per employee and per week, so ACA and benefits measurements rest on real data. Start free →
What Counts as Part Time
No federal law defines part-time employment. The Fair Labor Standards Act, which sets minimum wage and overtime, does not use the term, and the Department of Labor says plainly that whether an employee is full or part time is for the employer to decide. In practice, three numbers do most of the work.
| Source | Part time means | Used for |
|---|---|---|
| Bureau of Labor Statistics | 1 to 34 hours a week | Labor statistics; the figure most often quoted in news |
| Affordable Care Act (IRS) | Averaging under 30 hours a week, or under 130 a month | Whether an applicable large employer must offer health coverage |
| Typical employer policy | Under 30, often 20 to 29 hours; some set under 35 or under 40 | Eligibility for company benefits, PTO accrual, scheduling |
| Fair Labor Standards Act | No definition | Minimum wage and overtime apply regardless |
Because the ACA threshold carries a financial penalty for employers with 50 or more full-time-equivalent employees, 30 hours has become the de facto dividing line in most US workplaces: under 30 is part time, 30 and over is full time for coverage purposes. Our companion guide to how many hours is full time covers the other side of that line, and how many work hours are in a year gives the annual figures used to convert between weekly and yearly hours.
The Thresholds That Trigger Rights and Benefits
Part-time status is less a single category than a set of thresholds, each attached to a different law or plan. An employee working 28 hours a week may be part time for health coverage, eligible for the 401(k), and short of FMLA eligibility in the same year.
| Threshold | What happens when it is crossed | Measured over |
|---|---|---|
| 30 hours a week / 130 a month | Employee counts as full time under the ACA; applicable large employers must offer affordable coverage or risk a penalty | Monthly, or a look-back period of 3 to 12 months for variable-hour staff |
| 40 hours in a workweek | Overtime at time and a half under the FLSA, part time or not | Each fixed workweek |
| 1,000 hours in a 12-month period | Traditional eligibility for 401(k) and other ERISA retirement plans | 12 months from hire, then plan year |
| 500 hours in each of 2 consecutive years | Long-term part-time employees must be allowed to make 401(k) elective deferrals (SECURE 2.0, from 2025 plan years; was 3 years) | Consecutive 12-month periods, counting from 2021 onward |
| 1,250 hours in the prior 12 months plus 12 months of service | Eligibility for FMLA leave at employers with 50+ employees | Rolling 12 months |
| State sick-leave accrual, typically 1 hour per 30 worked | Paid sick leave accrues from the first hour in states with sick-leave laws; part-time staff are covered | Per hour worked |
Each of these is measured on actual hours worked, which is why the hours record for part-time staff matters as much as it does for full-time staff. An employer that cannot show a part-time employee's hours cannot show that they stayed under 30 for ACA purposes, or that they did or did not reach 1,000 for the plan.
What Part-Time Employees Are Entitled To
Always, regardless of hours: at least the federal or state minimum wage; overtime at 1.5 times the regular rate for hours over 40 in a workweek (and daily overtime in states that have it); protection under anti-discrimination, safety and wage-payment laws; workers' compensation; accrual of state-mandated paid sick leave where it exists; and, in several states and cities, predictive-scheduling rights such as advance notice of shifts and premium pay for last-minute changes.
Often, by policy rather than law: paid time off, usually prorated; holidays, either prorated or excluded; health, dental and life insurance, commonly limited to staff at or above 30 hours; retirement plan access, subject to the hour rules above; and tuition or development benefits. The ACA does not require coverage for part-time employees, and no federal law requires PTO for anyone, so these are where employer policies differ most.
Not usually: FMLA leave unless the 1,250-hour test is met; unemployment benefits are state-specific and based on earnings rather than hours; and exempt status, since an employee paid below the salary threshold is non-exempt whatever their title. Our exempt vs non-exempt guide covers why most part-time staff are non-exempt by default.
Prorating PTO and Benefits for Part-Time Staff
The cleanest way to treat part-time employees fairly is to accrue leave per hour worked rather than per pay period. A full-time allowance of 15 days (120 hours) over a 2,080-hour year is 0.0577 hours of PTO per hour worked; an employee averaging 20 hours a week earns 60 hours a year automatically, with no separate part-time table to maintain. Holidays can be handled the same way, paying the holiday at the average daily hours of the previous quarter. Our guide to how PTO works covers the accrual methods and the state rules on carryover and payout that apply to part-time balances too.
Two cautions. Policies that express part-time PTO in days rather than hours create disputes about what a day is worth for someone who works four-hour shifts. And where a state's paid-sick-leave law applies, the statutory accrual (commonly one hour per 30 worked) is a floor that a combined PTO bank must meet for the sick-leave portion.
The Limits Employers Should Watch
- Creeping hours. A part-time employee scheduled for 28 hours who regularly picks up shifts and averages 31 is full time for ACA purposes. Applicable large employers that do not offer coverage to such employees face the employer shared responsibility payment, which for 2026 is about $3,340 per full-time employee after the first 30 if no coverage is offered at all. Measurement must be on actual hours, and the look-back method exists precisely to handle variable schedules.
- Overtime for part-timers. Part-time status does not reduce the 40-hour threshold. A part-time employee who covers extra shifts and reaches 44 hours is owed 4 hours at time and a half.
- Misclassification as contractors. Low-hour workers are sometimes paid as independent contractors to avoid these thresholds. Hours worked have nothing to do with the contractor test; control and economic dependence do.
- Predictive scheduling. Oregon, and cities including New York, Seattle, Chicago, Philadelphia and San Francisco, require advance schedule notice and pay premiums for changes in covered industries, and some require offering extra hours to existing part-time staff before hiring. Our guide to flexible work schedules touches on the notice rules.
- Benefit-eligibility cliffs. Policies that cut benefits at exactly 30 hours encourage scheduling at 29.5, which some jurisdictions and most employees notice. Decide the threshold deliberately and apply it consistently.
Average Part-Time Hours and Who Works Them
Roughly one in six US workers is employed part time by the BLS definition, and the typical part-time week is around 20 hours. Most part-time work is voluntary, chosen for school, caregiving, retirement or a second job; a smaller share is involuntary, where the worker wants full-time hours and cannot find them. Retail, food service, healthcare support, education and hospitality account for most part-time roles, and the 2020s added a large remote and gig-adjacent part-time population working on computers. For that group, the questions about hours, overtime and productivity are the same as for full-time staff, just on a smaller base. Our guide to monitoring part-time and hourly workers covers how to manage them without over-measuring.
Tracking Part-Time Hours Accurately
Every threshold in this guide is an average or total of actual hours, so the record is the compliance. A part-time employee's timesheet should show daily start and stop times, unpaid breaks and weekly totals, and the system should be able to produce a 3 to 12-month average on request for ACA measurement and a 12-month total for plan eligibility.
E-Monitor's attendance tracking records hours automatically for part-time staff on computers, totals them by workweek and month, flags the week an employee crosses 30 hours or approaches 40, and keeps the daily record the FLSA requires. For shift-based part-time staff, see our guides to split shifts and rotating shift schedules.
Related reading: How Many Hours a Day Are Employees Actually Productive?, Fake Sick Days, Productivity Trends vs Snapshots.
Frequently Asked Questions
1. How many hours is part time?
There is no single legal answer. The BLS defines part time as 1 to 34 hours a week; the Affordable Care Act treats under 30 hours a week (130 a month) as not full time; most employer policies set part time at 20 to 29 hours. The FLSA does not define it at all.
2. Is 30 hours a week part time?
Not under the ACA, which counts 30 or more hours a week as full time for health-coverage purposes. Many employers therefore set part time at under 30. The BLS would still count 30 hours as part time (under 35).
3. Is 32 hours a week considered part time?
By the BLS definition yes (under 35); under the ACA no (30 or more is full time); under company policy it depends on the employer's threshold. Several employers now treat 32 hours as full time.
4. Do part-time employees get overtime?
Yes. The FLSA overtime threshold is 40 hours in a workweek regardless of status, so a part-time employee who works 44 hours in a week is owed 4 hours at time and a half. Daily overtime applies in California, Alaska, Nevada and Colorado.
5. Do part-time employees get benefits?
Minimum wage, overtime, workers' compensation and state paid sick leave apply regardless of hours. Health coverage is required only for employees averaging 30 or more hours at large employers. 401(k) access depends on the 1,000-hour rule or the 500-hour two-year long-term part-time rule. PTO and holidays are policy decisions, usually prorated.
6. Can a part-time employee qualify for FMLA?
Only if they have worked 1,250 hours in the previous 12 months and have 12 months of service at an employer with 50 or more employees within 75 miles. At 24 hours a week that is about 52 weeks of work.
7. What is the maximum hours for part time?
There is no legal maximum. An employee called part time who regularly averages 30 or more hours is full time for ACA purposes, and one who works over 40 in any week earns overtime. The practical limit is whatever threshold the employer's policy sets, applied to actual hours.
8. How do you prorate PTO for part-time employees?
Accrue per hour worked. Divide the full-time annual allowance in hours by 2,080 to get an hourly rate (120 hours gives 0.0577 per hour) and apply it to every hour the part-time employee works. Balances then scale automatically with the schedule.
Thresholds measured on real hours. E-Monitor records part-time hours automatically per week and per month, flags the week an employee approaches 30 or 40 hours, and keeps the daily record that ACA measurement, plan eligibility and the FLSA all depend on. 7-day free trial, no credit card. Sign up →