The single most common misunderstanding about part-time work and health insurance is that the Affordable Care Act made employers cover part-timers. It did not. It created a penalty that applies to one group of workers, full-time employees at large companies, and left everyone else outside the fence.
Every figure and rule below was pulled on September 6, 2026 from the regulation, revenue procedure, or survey that carries it. This is a plain-English summary of published rules, not tax or legal advice.
The 30-Hour Line, and Who It Applies To
Under 26 CFR 54.4980H-1, a full-time employee is “an employee who is employed an average of at least 30 hours of service per week with an employer” for a given calendar month. The regulation adds a monthly equivalent: 130 hours of service in a calendar month counts as at least 30 hours a week.
That definition only matters if your employer is an applicable large employer, defined in the same section as one that “employed an average of at least 50 full-time employees (including full-time equivalent employees) on business days during the preceding calendar year.”
Note the parenthetical. Part-timers get counted, combined into full-time equivalents, when the question is whether the company is big enough to be covered. They do not get counted when the question is who has to be offered a plan. Your hours can help push your employer over the 50-employee line and still leave you personally with no offer.
The regulation even has a name for you. A “part-time employee” is a new employee the employer “reasonably expects to be employed on average less than 30 hours of service per week.” There is no obligation attached to that label.
There Is No Federal Requirement to Cover Part-Timers
If you want the rule stated in one sentence, it is in 45 CFR 147.116(b)(1), the waiting-period regulation: nothing in that section “requires a plan or issuer to offer coverage to any particular individual or class of individuals (including, for example, part-time employees).”
HealthCare.gov says the same thing in consumer language: “Employers aren’t required to provide health insurance for part-time employees, even if they provide coverage for full-time employees.”
The data matches. In the Bureau of Labor Statistics benefits survey with a March 2025 reference date, the most recent edition as of September 2026, 25% of part-time workers in private industry had access to medical care benefits, and only 42% of those with access took them up. Full-time workers had 87% access and a 65% take-up rate. KFF’s 2025 Employer Health Benefits Survey found that 27% of firms with 200 or more workers that offer health benefits extend them to part-time workers, essentially unchanged from 26% in 2024.
What the Penalty Actually Costs an Employer
The reason large employers care about your hour count is the employer shared responsibility payment, and the numbers rose sharply for 2026.
| Employer mandate figure | 2026 |
|---|---|
| 4980H(a) penalty, per full-time employee per year (no offer to 95% of them) | $3,340 |
| 4980H(b) penalty, per full-time employee who receives a tax credit | $5,010 |
| Affordability threshold (required contribution percentage) | 9.96% of household income |
| Full-time definition | 30 hours per week, or 130 hours per month |
| Applicable large employer threshold | 50 full-time employees including FTEs |
| Maximum waiting period once eligible | 90 days |
The penalty amounts come from IRS Revenue Procedure 2025-26, which sets the adjusted $2,000 amount at $3,340 and the adjusted $3,000 amount at $5,010 for calendar year 2026. The 9.96% affordability percentage for plan years beginning in 2026 comes from Revenue Procedure 2025-25.
The 4980H(a) payment applies when an employer fails to offer coverage to at least 95% of its full-time employees and at least one of them gets a Marketplace premium tax credit. It is assessed on the total full-time headcount minus 30. The 4980H(b) payment is narrower: it applies per full-time employee who actually receives a tax credit because the offer was unaffordable or lacked minimum value, and it is capped at what the (a) penalty would have been.
None of that touches a part-time employee. There is no penalty amount attached to leaving you uncovered.
How Employers Count Your Hours
This is where real jobs get complicated, because hours move. 26 CFR 54.4980H-3 gives employers two methods.
The monthly measurement method is the simple one. The employer counts your hours of service in each calendar month and treats you as full-time in any month you hit 130. Coverage tracks your hours in something close to real time.
The look-back measurement method is the one most large hourly employers use. The employer picks a standard measurement period of at least 3 and no more than 12 consecutive months, adds an optional administrative period of up to 90 days, and then locks your status in for a stability period that “must be at least six consecutive calendar months but no shorter in duration than the standard measurement period.”
That lock cuts both ways. If you averaged 30 hours during the measurement period, the employer must treat you as full-time for the whole stability period “regardless of the employee’s number of hours of service during the stability period.” If you fell short, you can work 38 hours a week for six months and still not be eligible until the next cycle.
The category in between is the variable hour employee: someone whose hours the employer “cannot determine” at the start date because they are “variable or otherwise uncertain.” New variable hour, seasonal, and part-time employees go through an initial measurement period of up to 12 months before anyone decides. The regulation caps the combination of initial measurement period plus administrative period at 13 months and a fraction, so a new variable-hour hire can legitimately wait more than a year for a first offer.
One more lever: 45 CFR 147.116 caps waiting periods at 90 days, but it also blesses a cumulative hours-of-service condition of up to 1,200 hours. The regulation’s own example is a worker at 25 hours a week who starts January 6 and does not satisfy a 1,200-hour condition until December 15.
Which Employers Actually Cover Part-Timers
A minority do, and the ones that do usually publish the threshold. These are the rules as stated on each company’s own page as of September 2026.
| Employer | Published part-time eligibility rule |
|---|---|
| Target | Hourly team members “become eligible for health benefits at just 25 hours per week” |
| Starbucks | Part-time mainland partners establish eligibility after 240 total hours over three consecutive months, then need 520 hours per six-month audit period to keep it, which Starbucks describes as 20 hours per week |
| Costco | Coverage offered to “full-time and part-time employees,” with spouses, children and domestic partners also eligible |
If you are shopping for a part-time job specifically for the benefits, the hour threshold and the measurement period are the two things to ask about in the interview. A 20-hour threshold with a three-month qualifying period is a materially better offer than a 25-hour threshold with a 12-month look-back, even at the same wage. Costco is also one of the employers that extends eligibility to unmarried partners, which is its own separate question covered in domestic partner health insurance.
What You Actually Pay Either Way
Getting on the employer plan is not free. In KFF’s 2025 survey the average annual premium was $9,325 for single coverage, of which covered workers paid $1,440 themselves, and $26,993 for family coverage, of which workers paid $6,850. Part-time workers are frequently offered a smaller employer contribution than full-timers, so treat those averages as a ceiling on generosity, not a promise.
The Marketplace is the usual alternative, and 2026 changed the math. The enhanced premium tax credits expired at the end of 2025, so the applicable percentage table in Revenue Procedure 2025-25 tops out at “at least 300% but not more than 400%” of the federal poverty line. Above 400%, the credit is gone entirely. Below it, your capped contribution runs from 2.10% of income at the bottom to 9.96% at the top.
For a low-wage part-time worker, that still lands somewhere manageable. KFF calculates that a single person at 150% of poverty now pays 4.19% of income, roughly $82 a month, for a benchmark silver plan that would have cost $0 in 2025. Across all Marketplace enrollees, KFF puts the average monthly premium payment at $178 in 2026, up 58% from $113 in 2025. Deductibles moved too: the average Marketplace deductible hit $3,786 in 2026, a 37% jump, as enrollees traded down to bronze plans.
If your income is under 138% of the federal poverty level and you live in a Medicaid expansion state, Medicaid is the better answer and costs nothing. The 2026 HHS poverty guideline is $15,960 for a single person in the 48 contiguous states and DC, so 138% of it is roughly $22,025 a year, or about $10.60 an hour at 40 hours a week.
Your Actual Options, Ranked
- Take the employer plan if the hours qualify you. Even a mediocre group plan usually beats an unsubsidized individual plan, and the employer contribution is money you cannot get any other way.
- Medicaid, if you are under 138% of poverty in an expansion state.
- A Marketplace silver plan with cost-sharing reductions, if you are between 100% and 250% of poverty. Silver is the only metal level that carries the extra help, which is explained in cost-sharing reduction.
- A spouse’s or parent’s plan. If you are under 26, a parent’s plan is often the cheapest coverage in existence for you. See how long you can stay on your parents’ insurance.
- State continuation or COBRA, if you are losing an employer plan because your hours were cut. A reduction in hours is a COBRA qualifying event, and smaller employers are covered by mini-COBRA state continuation laws instead.
Losing employer coverage because of an hours cut opens a special enrollment period, which is the mechanism explained in qualifying life events. Do not wait for open enrollment if that happens to you.
The Bottom Line
The federal line is 30 hours a week or 130 hours a month, it applies only at employers with 50 or more full-time equivalents, and it creates no obligation at all toward part-time staff. Roughly a quarter of part-time workers have access to a job-based plan, so plan on the Marketplace being your route rather than the exception. If you end up uninsured while you sort it out, start with the uninsured playbook and know what a doctor visit without insurance actually costs before you need one.