How many hours is part time? Federal, ACA and employer answers

How many hours is part time? Ask the Department of Labor and the answer is “whatever the employer says.” Ask the IRS and the answer is anything under 30 hours a week. Ask the Bureau of Labor Statistics and it is anything under 35. Ask a restaurant or retail manager and you will usually hear 20 to 29. All four are correct, because each one is answering a different question: pay, health coverage, statistics or scheduling. This guide walks through each definition, what changes at every hour mark, and how to write a part-time policy that holds up.

How many hours is part time a week? The three official answers

Start with the law that governs pay. The Fair Labor Standards Act (FLSA) does not define full-time or part-time employment. The Department of Labor’s Wage and Hour Division states that this is “a matter generally to be determined by the employer,” and that the label does not change how the FLSA applies. A part-timer gets the same minimum wage ($7.25 federally, higher in most states) and the same overtime protection as anyone else.

Next, health coverage. The Affordable Care Act’s employer shared responsibility rules, administered by the IRS, define a full-time employee as one with at least 30 hours of service a week on average, or 130 hours in a calendar month. That line only matters to applicable large employers (ALEs), meaning employers with 50 or more full-time employees including full-time equivalents in the prior year. For them, anyone under 30 hours is part time and does not have to be offered coverage.

Third, statistics. The Bureau of Labor Statistics counts people who usually work 35 or more hours a week as full-time and fewer than 35 as part-time in the Current Population Survey. BLS says plainly that these categories are for statistical purposes only, so they do not bind any employer.

The sibling question, how many hours is full time, has the same shape: 30 for the ACA, 35 for BLS, and 32 to 40 by company policy.

Part time hours per week: what 20, 25, 29, 30 and 32 hours trigger

Because the definitions sit at different hour counts, a part-timer can cross a legal line without anyone changing their job title. The table below shows what each weekly average means, using 52 weeks a year and 52 ÷ 12 = 4.33 weeks a month.

Two numbers on this table surprise most managers. First, the 401(k) long-term part-time rule kicks in at 500 hours a year, which is under 10 hours a week, so nearly every part-timer qualifies after two years. Second, the FMLA line of 1,250 hours is only 24 hours a week, so a 25-hour employee can qualify for job-protected leave. Our FMLA leave guide covers the other tests.

What changes at 30 hours: the ACA employer mandate

The 30-hour line matters only if you are an applicable large employer. Here is how the IRS has you count. For each month of the prior year, add your full-time employees (30+ hours a week or 130+ hours that month) to your full-time equivalents. FTEs are the total hours of all part-time employees that month, counting no more than 120 hours per person, divided by 120. Average the 12 monthly totals. If the result is 50 or more, you are an ALE for the current year.

An illustrative example: a restaurant group has 38 full-time employees and 30 part-timers who each work 60 hours a month. The part-timers contribute 30 × 60 = 1,800 hours ÷ 120 = 15 FTEs. The group’s count is 38 + 15 = 53, so it is an ALE even though only 38 people work full time. The IRS has a seasonal worker exception: if your count exceeds 50 for 120 days or fewer in the year and the people pushing you over are seasonal workers, you are not an ALE.

Once you are an ALE, each full-time employee must be offered affordable minimum essential coverage, and you must offer it to at least 95% of full-time employees to avoid the broader penalty. The IRS indexes the payments every year. Under Rev. Proc. 2025-26, the 2026 amounts are $3,340 per full-time employee (minus the first 30) if you fail the 95% offer test and at least one full-time employee receives a premium tax credit, and $5,010 for each full-time employee who receives a credit when you did offer coverage but it was unaffordable or inadequate. Check irs.gov for the 2027 figures before budgeting.

Two methods decide who is full time. The monthly measurement method checks each calendar month for 130 hours. The look-back measurement method averages hours over a measurement period of 3 to 12 months and locks the status in for a following stability period, which is what most employers with variable-hour staff use so that one busy month does not trigger an offer. Either way, the count is hours of service, which includes paid time off and paid holidays, not just hours worked. Jordan Lee at Northfield Coffee, scheduled 28 hours a week, averages 121 hours a month. Two 5-hour pickup shifts in the same month put him at 131, a full-time month under the monthly method.

If you have fewer than 50 FTEs, none of this applies. You choose your own benefits line, subject to your insurance carrier’s eligibility rules, which often require 30 hours but sometimes allow 20 or 25.

Overtime still starts at 40, whatever the label

Part-time status never reduces overtime rights. Under the FLSA, a non-exempt employee earns 1.5 times their regular rate for every hour worked over 40 in a fixed seven-day workweek. Almost all hourly part-timers are non-exempt, because the exemptions require a salary of at least $684 a week under federal rules plus a duties test, and part-time pay rarely reaches that. Our exempt vs non-exempt guide explains the tests.

Here is how it plays out. Chris Walker is a barista at Northfield Coffee in Austin, Texas, earning $17.75 an hour and scheduled for 24 hours in the Sunday to Saturday workweek of November 1 to 7, 2026. Two coworkers call out and he picks up 19 more hours, finishing at 43 hours.

• Regular pay: 40 × $17.75 = $710.00
• Overtime rate: $17.75 × 1.5 = $26.625
• Overtime pay: 3 × $26.625 = $79.88
• Week total: $789.88 before taxes

The fact that Chris is “part time” in the handbook changes nothing. Three points follow from this:

• No federal daily overtime. A part-timer who works one 12-hour shift and nothing else that week earns straight time federally, though California, Alaska, Colorado and Nevada add daily rules. See how to calculate overtime for state detail.
• No averaging across weeks. 22 hours one week and 44 the next is 4 hours of overtime, even though the biweekly total is 66.
• Records are required for everyone. The FLSA’s recordkeeping rules do not have a part-time exception: keep payroll records for 3 years and time cards for 2. A time clock app that records actual punches is the simplest way to do that for a team whose hours change every week.

Benefits, PTO and sick leave for part-time employees

Federal law does not require any private employer to offer vacation, PTO, paid holidays or health coverage to part-time employees (or full-time ones, apart from the ACA rules above). So most benefit questions come down to three things: your handbook, your insurance plan documents, and state or local leave laws.

PTO and holidays. You can exclude part-timers, include them at a lower rate, or pro-rate. The cleanest approach is an accrual rate per hour worked, because it scales automatically. A rate that gives a 2,080-hour full-timer 80 hours a year is 80 ÷ 2,080 = 0.0385 hours per hour worked. Maya Torres, who works 25 hours a week at the front counter, earns 1,300 × 80 ÷ 2,080 = 50 hours a year on the same rate. Our PTO guide covers accrual methods and state payout rules, and holiday pay rules covers pro-rated holidays, such as 4 hours for a 20-hour employee. Whatever you choose, apply it consistently; a benefit given to some part-timers and not others invites a discrimination claim.

State and city sick leave laws usually cover part-timers. This is where “employer choice” ends. California’s paid sick leave law covers anyone who works 30 or more days for the same employer in a year, including part-time and temporary staff, with accrual of at least 1 hour per 30 hours worked and a minimum of 40 hours or 5 days a year, per the Labor Commissioner’s Office. New York State’s law covers all private-sector employees regardless of part-time status, also at 1 hour per 30 hours worked, with 40 hours a year for employers of 5 to 99 and 56 hours for 100 or more. More than a dozen other states and many cities have similar laws, and almost all of them accrue by hours worked so part-timers earn in proportion. Check your state labor department before writing the sick leave section of your policy.

Health insurance. Below 50 FTEs you decide, within your carrier’s rules. At 50 or more, the 30-hour ACA line decides for you. Many employers that are not ALEs still offer coverage at 30 hours because that is where carriers commonly set eligibility.

FMLA. Job-protected unpaid leave does not depend on full-time status. The Department of Labor’s eligibility tests are 12 months of employment, 1,250 hours worked in the 12 months before leave, and a worksite with 50 or more employees within 75 miles. A 25-hour-a-week employee at a qualifying employer meets the hours test.

401(k) plans: the long-term part-time rule

If you sponsor a 401(k), you can no longer keep part-timers out indefinitely with a 1,000-hour eligibility rule. The SECURE Act created a “long-term, part-time employee” category, and the SECURE 2.0 Act shortened it. For plan years beginning on or after January 1, 2025, an employee who is at least 21 and has worked at least 500 hours in each of two consecutive 12-month periods must be allowed to make salary deferrals. Before 2025 the test was three consecutive years.

What the rule does and does not require:

• Deferrals only. You must let the employee contribute from their own pay. You are not required to give them the employer match or non-elective contributions, though you may.
• Low bar. 500 hours a year is about 9.6 hours a week. A 20-hour part-timer hits it in six months of each year.
• Hours must be tracked. You need hours of service by 12-month period for every part-timer, including people you previously treated as ineligible. The IRS notes the rule does not apply to plans that use the elapsed-time method for eligibility.
• Guidance is still settling. The IRS issued Notice 2024-73 for 403(b) plans and said the final 401(k) regulation will apply no earlier than plan years beginning on or after January 1, 2026. As of this writing we could not confirm that the final rule has been published, so ask your plan administrator what your plan document says.

Unemployment benefits and part-time work

Unemployment insurance is a state program, and the Department of Labor notes that each state sets its own eligibility rules within federal guidelines. Three questions come up with part-timers.

Can a laid-off part-timer collect? Usually yes, if their wages during the state’s base period (in most states the first four of the last five completed calendar quarters) meet the state minimum and they lost the job through no fault of their own. The weekly benefit is based on past earnings, so a part-timer’s benefit is smaller than a full-timer’s.

Can someone collect while working part time? Most states pay partial benefits when hours are cut or a claimant finds part-time work, reducing the weekly benefit by some portion of the earnings. The formulas differ a lot by state.

Can a claimant limit themselves to part-time work? This is where states split. Some require claimants to be available for full-time work; others let people with a history of part-time work seek part-time jobs. Point employees to your state workforce agency rather than guessing.

For employers, the practical point is that cutting a part-timer’s hours sharply, or ending a seasonal role, can generate a claim that counts against your experience rating. Document the business reason for schedule reductions.

Part time vs full time hours, seasonal and temporary compared

Employers often use four labels for people on the schedule. Legally they overlap more than most managers expect.

“Temporary” and “part time” are also sometimes confused with “contractor.” They are not the same thing. A temp hired on your payroll is a W-2 employee with full wage and hour protection; only a genuinely independent business is a 1099 contractor. Our 1099 vs W-2 guide walks through the tests.

Scheduling part-timers fairly and within the law

Federal law sets no minimum notice for schedules, no minimum shift length and no limit on how often hours change. A growing list of places does. Oregon’s predictive scheduling law, enforced by the Bureau of Labor and Industries, covers retail, hospitality and food service employers with 500 or more employees worldwide and requires a written schedule 14 days in advance, a good-faith estimate of hours at hire, predictability pay for late changes (one hour of pay for added time, half pay for hours cut), and 10 hours of rest between shifts unless the employee agrees otherwise. New York City’s Fair Workweek Law, enforced by the Department of Consumer and Worker Protection, requires fast food employers to post schedules 14 days ahead and pay premiums for changes, and retail employers to give 72 hours’ notice with no on-call shifts. Seattle, San Francisco, Chicago, Philadelphia and Los Angeles have their own versions. Check your city before assuming you are clear.

Even where no law applies, part-time schedules go wrong in predictable ways. A few rules keep them fair and keep you on the right side of the 30-hour line:

• Give every part-timer a floor and a ceiling. “Regularly scheduled 16 to 28 hours a week” is a promise an employee can plan a life around. It also tells managers how much pickup work is safe.
• Watch monthly hours, not just weekly. The ACA test is 130 hours in a calendar month. A 28-hour employee who grabs two extra shifts crosses it. If you are an ALE using the monthly method, that is an offer of coverage or a potential payment.
• Publish early and change rarely. Two weeks of notice is the legal standard in the strictest cities and good practice everywhere. When you must change a shift, ask for volunteers before reassigning.
• Count hours of service, not just punches. Paid sick leave and PTO count toward the ACA’s 130 hours but not toward FLSA overtime. Your system should total each separately.
• Review status on a schedule. Once a quarter, compare each part-timer’s actual average with their policy range. Someone averaging 33 hours for six months is full time in practice, and courts and agencies look at practice.

If you still build the week in a spreadsheet, our free weekly schedule templates include hour totals per person. Scheduling software goes further by showing each person’s hours as you drag shifts, letting staff swap shifts in the app with both people’s new totals visible, and comparing the schedule with actual clock-ins.

Sample part-time policy wording

Put the definition in writing so managers, payroll and employees use the same one. Replace the bracketed fields, delete the ACA paragraph if you have fewer than 50 full-time equivalent employees, and have an employment attorney review it against your state and city rules.

Pair this with your attendance policy so the rules on call-outs and pickup shifts match, and store the signed acknowledgment with the employee’s other HR documents.

Frequently asked questions