Last reviewed October 6, 2026. This page explains general rules and is not legal or tax advice. State definitions change; confirm your status with your carrier, your tax advisor or counsel.
Two separate things happen when a company grows past 50 employees, and most of the confusion comes from treating them as one. The first is ACA applicable large employer status, which is a compliance question: what you must offer, and what you must report. The second is the move from the small group to the large group health insurance market, which is what actually changes your premium. They use different counting rules, they can trigger in different years, and they call for different decisions.
Who wrote this. PEO Consulting Partners is an independent PEO brokerage and consulting firm, placing clients since 2015: 100+ clients placed, 36 PEOs compared, and every comparison reconciled plan by plan and tier by tier on the same enrolled population. This page uses no client data.
ACA applicable large employer status
According to the IRS ACA Information Center for Applicable Large Employers, an employer with at least 50 full-time employees, including full-time equivalent employees, on average during the prior calendar year is an applicable large employer (ALE) for the current calendar year. Status is determined each year.
An ALE has two sets of obligations:
- Employer shared responsibility under section 4980H. An ALE that does not offer affordable, minimum value coverage to its full-time employees can owe a payment.
- Information reporting under section 6056. The ALE files Form 1094-C as the transmittal to the IRS and furnishes Form 1095-C to its full-time employees. An ALE with a self-insured plan also has reporting under section 6055.
Three things buyers miss:
- It counts full-time equivalents, not headcount. Part-time hours are combined into full-time equivalents. A company with 40 full-time employees and a large part-time staff can be an ALE.
- It is based on the prior year's average, not today. Your status this year was set by last year's numbers. Hiring past 50 this spring does not make you an ALE this year; averaging 50 or more this year makes you one next year.
- It is redetermined every year. A company can be an ALE one year and not the next.
Small group versus large group insurance
Separately from the ACA employer rules, your health insurance is sold in either the small group or the large group market, and the line between them is set by the state. According to healthinsurance.org's guide to group health insurance:
- In 47 states, small group means up to 50 employees, so a group with 51 or more is large group.
- California, New York and Vermont define small group as up to 100 employees.
- Colorado previously used the 100-employee definition and switched to a 50-employee small group limit starting in 2026. Colorado employers with 51 to 100 employees who were rated as small group are now large group. Much of what is published on this still says Colorado uses 100; for 2026 renewals it does not.
Why the market change is the one that moves money
The two markets are rated under different rules, and the difference is the commercial point of this page.
| Small group | Large group | |
|---|---|---|
| What can change your premium | Only age (maximum 3 to 1 ratio, older to younger), family size, geography and tobacco use | Claims experience and medical underwriting, in addition to demographics |
| Does your claims history affect the rate? | No | Yes |
| What a bad renewal usually means | The market moved | Frequently, something about your group |
In small group, every employer is community rated: a group with an expensive year pays the same rates as an identical group with a quiet one. In large group, that protection is gone. So in small group a bad renewal is the market moving. In large group a bad renewal is frequently about you.
What it does to your renewal strategy
Good claims experience makes large group an opportunity. For the first time, you can get credit for being healthier than average. Ask carriers for experience-rated quotes, and look at level-funded and self-funded arrangements, which become realistic above roughly 50 lives. Remember that funding alternatives lower cost by transferring claims risk to you.
Poor claims experience makes large group exposure. A group with a few large claims can see an increase that has nothing to do with the market. Here a PEO master plan can function as a return to pooled rating: your employees are priced as part of a much larger group instead of on your own experience.
Either way, price both paths at the first large group renewal, and compare them the way we describe in how to cut health insurance costs without cutting benefits: same enrolled population, tier by tier, with the out-of-pocket maximum checked, not just the premium.
Crossing 50 at your next renewal? Get large group, level-funded and PEO options compared side by side →
Employee thresholds that get confused
| Rule | Threshold | How it is counted |
|---|---|---|
| Federal COBRA | 20 or more employees | Employees on more than half of typical business days in the prior calendar year, with part-time employees counted fractionally |
| FMLA | 50 or more employees | The employer is covered at 50 or more employees in 20 or more workweeks in the current or prior calendar year; an employee is eligible only if 50 employees work within 75 miles of their worksite |
| ACA applicable large employer | 50 full-time employees plus full-time equivalents | Average over the prior calendar year, redetermined every year |
| Large group insurance (47 states, Colorado included from 2026) | More than 50 employees | Set by state rules and applied by the carrier at renewal |
| Large group insurance (California, New York, Vermont) | More than 100 employees | Set by state rules and applied by the carrier at renewal |
These are different tests with different counting rules, and they do not always agree in the same year. A company can be an ALE while still in the small group market, or large group before it is an ALE. Track each one on its own.
FAQ
What changes when a company reaches 50 employees?
Two separate things, and they get confused. Under the ACA, an employer with at least 50 full-time employees including full-time equivalents, on average during the prior calendar year, is an applicable large employer (ALE) for the current year, which brings employer shared responsibility under section 4980H and Form 1094-C and 1095-C reporting. Separately, in 47 states a group with more than 50 employees moves from the small group to the large group insurance market, where claims experience can affect your premium. The first is compliance. The second is what moves money.
Do part-time employees count toward the 50-employee ACA threshold?
Yes, through full-time equivalents. ALE status counts full-time employees plus full-time equivalents, so the hours of part-time employees are combined into equivalent full-time employees. A company with 40 full-time employees and enough part-time hours can be an ALE without ever having 50 people on a full-time schedule.
When does ALE status start?
ALE status for a calendar year is based on your average employee count during the prior calendar year, not on today's headcount, and it is determined again every year. Crossing 50 in March does not make you an ALE that month; averaging 50 or more across the year makes you an ALE for the following year.
Is a company with 51 to 100 employees small group or large group?
In 47 states, large group: small group means up to 50 employees. California, New York and Vermont define small group as up to 100. Colorado previously used the 100-employee definition and switched to a 50-employee small group limit starting in 2026, so Colorado employers with 51 to 100 employees who were rated as small group are now large group.
Why did my health insurance renewal change after we grew past 50 employees?
Because the rating rules changed. In the small group market, premiums can vary only by age (with a maximum 3 to 1 ratio, older to younger), family size, geography and tobacco use, and claims history cannot affect the rate. In the large group market, claims experience and medical underwriting can affect premium. In small group a bad renewal is the market moving; in large group a bad renewal is frequently about you.
Can a PEO help a company that has just become large group?
It can. A PEO master plan prices your employees as part of a much larger pool, so for a group whose own claims experience would be penalised in the large group market it can work as a return to pooled rating. A group with good claims experience should also price level-funded and large group options, because it may finally get credit for being healthier than average.
Sources: IRS, ACA Information Center for Applicable Large Employers; healthinsurance.org, group health insurance. Last reviewed October 6, 2026. Not legal or tax advice.