Fifty is not one line. It is at least three, counted three different ways, and they take effect on different dates. The federal employer mandate counts full time employees plus full time equivalents from last year. The insurance market counts however your state tells carriers to count. And several of the rules that feel like “50 employee rules” really start at 20 or 100.
Most of the attention goes to the employer mandate. For a company that already offers decent coverage, the mandate is mostly paperwork. The change that costs real money is quieter. Your health plan moves into a market where the carrier is allowed to price you on your own claims.
Which thresholds actually apply to you?
| Headcount | What starts | How it is counted |
|---|---|---|
| 20 | Federal COBRA, and your group plan pays before Medicare for active employees 65 and older. | Prior calendar year, typical business days. For Medicare, 20 or more weeks this year or last. |
| 50 | Applicable large employer status. The employer mandate and ACA reporting come with it. | Full time employees plus full time equivalents, averaged over the prior year. |
| 50 | FMLA coverage. | 50 or more employees in 20 or more workweeks this year or last. |
| 51, or 101 in three states | Large group health insurance market, with experience rating. | Set by state law, and methods differ. |
| 100 | EEO-1 filing and Form 5500 for most health plans. Medicare secondary payer rules extend to disability. | EEO-1 counts employees, while Form 5500 counts covered participants in the plan. |
ALE status runs on last year’s numbers.
Per the IRS, whether you are an applicable large employer is decided each calendar year based on your average workforce during the prior year. A full time employee averages at least 30 hours of service a week, or 130 hours in a month. For everyone else, add up their monthly hours with each person capped at 120, then divide by 120. Those full time equivalents count toward the 50.
So a company that crosses 50 in March 2026 is typically not an ALE until January 2027.
Treat the crossing year as the preparation year. One narrow exception exists. If you exceed 50 for 120 days or fewer and the extra people are seasonal workers, you are not an ALE.
What the employer mandate costs in 2027
Section 4980H has two separate penalties, and they work very differently.
- The 4980H(a) penalty applies if you fail to offer minimum essential coverage to at least 95% of full time employees and one of them receives a premium tax credit on the exchange. For 2027 it is $3,780 per full time employee, minus the first 30, across the entire full time workforce.
- The 4980H(b) penalty applies if you offer coverage but it is unaffordable or fails minimum value. For 2027 it is $5,670, charged only for each full time employee who actually gets a subsidy, and capped at what the (a) penalty would have been.
The arithmetic on (a) is what scares people. A company with 60 full time employees that offers nothing faces (60 minus 30) times $3,780, which is $113,400 a year. One subsidized employee triggers it.
Affordability is the test most offering employers should watch. Under Rev. Proc. 2026-26, coverage is affordable for plan years beginning in 2027 if the employee’s self only contribution is no more than 10.22% of household income, up from 9.96% for 2026. Employers never see household income, so most use an IRS safe harbor instead, such as one based on each employee’s wages. Your lowest paid full time employee sets the ceiling.
The reporting is the part that bites small HR teams.
Every ALE files Form 1094-C with the IRS plus a Form 1095-C for each full time employee, showing month by month what was offered and what it cost. File 10 or more information returns in a year and you must file electronically, so nearly every ALE is an electronic filer.
For the 2025 tax year, the IRS instructions set electronic filing for March 31, 2026 and furnishing to employees for March 2, 2026. The penalty for a failure to file a correct return is $340 per return, and the same $340 applies per statement you fail to furnish correctly.
There is real relief on the furnishing side. The Paperwork Burden Reduction Act, signed December 23, 2024, and IRS Notice 2025-15 let an employer skip automatically mailing Form 1095-C if it posts a clear, conspicuous notice on its website by the furnishing deadline and sends the form within 30 days of any request. The IRS filing itself does not go away.
The practical warning: the 1095-C codes are only as good as your payroll hours data. Fix that in the crossing year.
Small group ends at 50 in most states, and at 100 in three.
The Protecting Affordable Coverage for Employees Act of 2015 set the federal small group definition at 1 to 50 employees and let states expand it to 100. California, Colorado, New York and Vermont did. Colorado has since moved back to 50 from January 1, 2026, under SB24-073, and its Division of Insurance says employers with 51 to 100 employees have up to 5 years to make the switch to large group. Everywhere else, a group of 51 is generally large group.
The counting method is where owners get caught. Federal rules for the SHOP exchange use the same full time equivalent method as the employer mandate, but CMS allowed states to use other reasonable methods for coverage sold outside the exchange. Maine’s Bureau of Insurance Bulletin 436 gives the cleanest example: an employer with 10 full time employees and 75 people working 20 hours a week has 10 eligible employees under Maine’s head count, and 60 or more full time equivalents under the federal method. Under Maine’s approach that company buys small group coverage. It may still be an ALE for IRS purposes.
Two lines, two answers, same company.
What actually changes in how you are rated
In the small group market, 45 CFR 147.102 lets a carrier vary your premium on only four things: age within a 3 to 1 band, tobacco within 1.5 to 1, geography and family size. Your claims history is irrelevant to the price. That is community rating, and it protects groups with sick employees while overcharging groups with healthy ones.
Cross into large group and that protection disappears. Carriers can use your actual experience. Large group coverage is also outside the essential health benefits requirement that governs individual and small group plans, which gives you more design freedom, although the ACA out of pocket maximum still applies to every non grandfathered group plan.
Our view, from watching groups make this move: the first large group renewal is where the category change shows up, and it splits hard. A young group with clean claims often sees its best renewal in years. A group with one ongoing cancer case or a premature birth in the last 12 months can see a number that makes the community rated market look generous in hindsight. You cannot opt back into small group rating once you are over the line, so price it before the renewal lands.
Large group carriers also face a higher minimum medical loss ratio, 85% against 80% for small group. Per KFF, 2025 simple loss ratios averaged 87% in small group and 91% in large group. Thinner margins mean competition worth using.
The funding menu widens too. In New York, where Insurance Law 3231(h)(1) bars stop loss for community rated groups, crossing 100 is what makes level funding available.
COBRA started at 20, and so did Medicare coordination.
Federal COBRA applies unless you normally employed fewer than 20 employees on at least 50% of your typical business days in the prior calendar year, per 26 CFR 54.4980B-2. If you are crossing 50 and never set up COBRA notices, you have probably been out of compliance for a while. The same 20 employee line makes your group plan the primary payer, ahead of Medicare, for active employees 65 and older. At 100, that primary payer rule extends to employees entitled to Medicare through disability.
Frequently asked questions
How many employees do you need for large group health insurance?
In most states, 51 or more. The Protecting Affordable Coverage for Employees Act of 2015 set the small group ceiling at 50 and allowed states to raise it to 100. In the three states that use that option, including New York and California, large group starts at 101. Counting methods also vary by state, so confirm exactly how your carrier counts.
When does a company become an applicable large employer?
When it averaged at least 50 full time employees, including full time equivalents, during the prior calendar year. A full time employee averages 30 hours a week or 130 hours a month, and part time hours are converted by dividing total monthly hours, capped at 120 per person, by 120. ALE status applies to the following calendar year.
What are the ACA employer mandate penalties for 2027?
The 4980H(a) penalty for not offering coverage to at least 95% of full time employees is $3,780 per full time employee, minus the first 30. The 4980H(b) penalty for unaffordable or inadequate coverage is $5,670 per full time employee who receives a premium tax credit, capped at the (a) amount. Coverage is affordable for 2027 plan years at 10.22% of household income under Rev. Proc. 2026-26.
Do employers still have to send Form 1095-C to employees?
Not automatically. Under the Paperwork Burden Reduction Act and IRS Notice 2025-15, an employer can post a clear notice on its website by the furnishing deadline and provide Form 1095-C within 30 days of a request. The employer must still file Forms 1094-C and 1095-C with the IRS, electronically if it files 10 or more returns.
Does crossing 50 employees raise health insurance rates?
It changes how rates are set. Small group carriers may rate on only four factors under 45 CFR 147.102, and none of them is claims. Large group carriers can use the group’s own claims experience. Healthy groups often see better renewals after the move, and groups with recent large claims often see worse ones.
At what size does COBRA apply?
Federal COBRA applies to employers that normally employed 20 or more employees in the prior calendar year. Under 26 CFR 54.4980B-2 an employer is exempt only if it had fewer than 20 employees on at least 50% of its typical business days that year.
Price the large group market before your first large group renewal
Send one census and your current plan summary. We take the group to large group and level funded carriers. The PEOs that fit your size get the same census, and every answer lands side by side against your current renewal. There is no fee to your business.
More context: whether your renewal increase is normal, health insurance inside a PEO, what an independent benefits broker does.
Related reading
- Employee Benefits Broker
- The Levers That Move Employer Health Costs
- What an Employee Benefits Broker Actually Does
- Benefits Broker, Benefits Consultant, PEO Broker: Which One Do You Need?
- Knowledge Center
Sources
- IRS, Determining if an employer is an applicable large employer
- IRS, Rev. Proc. 2026-22 (2027 section 4980H amounts)
- IRS, Rev. Proc. 2026-26 (2027 affordability percentage)
- IRS, Rev. Proc. 2025-25 (2026 affordability percentage)
- IRS, Instructions for Forms 1094-C and 1095-C (2025)
- IRS, Notice 2025-15
- Public Law 114-60, Protecting Affordable Coverage for Employees Act
- 42 U.S.C. 300gg-91(e), small employer definition and state option
- California Health and Safety Code 1357.500
- Colorado Division of Insurance, small employer definition change under SB24-073
- New York Insurance Law 3231
- 33 V.S.A. 1811 (Vermont)
- Maine Bureau of Insurance, Bulletin 436
- 45 CFR 147.102, fair health insurance premiums
- 42 U.S.C. 300gg-6, essential health benefits and cost sharing
- 45 CFR 158.210, minimum medical loss ratio
- KFF, 2026 Medical Loss Ratio Rebates
- 26 CFR 54.4980B-2, COBRA small employer plan exception
- CMS, Medicare Secondary Payer
- 42 CFR 411.170, Medicare secondary payer, 20 employee count
- 42 CFR 411.101, large group health plan, 100 employee count
- U.S. Department of Labor, Family and Medical Leave Act
- 29 CFR 1602.7, EEO-1 filing requirement
- 29 CFR 2520.104-20, small welfare plan Form 5500 exemption