Applicable large employer: the ACA employer mandate, ALE status and 4980H penalties

An applicable large employer is an employer that employed an average of at least 50 full time employees, including full time equivalents, on business days during the preceding calendar year. That is the whole definition, and it comes from 26 U.S.C. 4980H(c)(2). Nothing about revenue, industry or whether you already offer coverage enters into it.

Two things follow from the status, and they are separate obligations. The first is the employer shared responsibility provision: offer minimum essential coverage to at least 95% of your full time employees and their dependents, and make the lowest cost self only option both affordable and minimum value. The second is reporting, on Forms 1094-C and 1095-C, which you owe whether or not you ever face a payment.

Note who "dependents" covers, because employers routinely assume it is broader than it is. 26 CFR 54.4980H-1(a)(12) defines a dependent as a child under 26 and then says plainly: "The term dependent does not include the spouse of an employee." So the mandate never reaches a spouse, let alone a domestic partner. Extending the plan to a partner is a choice rather than an obligation, and once you make it the employer contribution becomes imputed income on the employee's W-2 unless the partner independently qualifies as their tax dependent.

The word most often missed in the definition is preceding. Status is always determined by the prior calendar year and then applies for the whole of the current one. A company that grows past 50 during 2026 is an applicable large employer for 2027, starting January 1. It owes nothing for 2026 no matter how large it gets, and it cannot shrink its way out of 2027 by cutting staff in February. The lag is deliberate: it gives a growing employer roughly a year to put a compliant plan in place before the duties attach.

The 2026 amounts rose 15.2% because the measuring stick changed, not because health premiums suddenly spiked. Rev. Proc. 2025-25 says so directly: beginning in calendar year 2026, HHS guidance provides a new premium growth measure that captures increases in individual market premiums in addition to increases in employer sponsored insurance premiums.

Until 2025 the premium adjustment percentage was built on per enrollee spending for employer sponsored insurance alone. The Marketplace Integrity and Affordability rule at 90 Fed. Reg. 27074, published June 25, 2025, added individual market premiums to that measure. Individual market premiums have grown faster, so the index moved sharply, and everything pinned to it moved with it: both penalty amounts and the affordability percentage.

This matters practically because the affordability number moved in the employer's favor while the penalty moved against it. The required contribution percentage went from 9.02% for 2025 to 9.96% for 2026, which means you can charge an employee meaningfully more in 2026 and still clear the affordability test. At a $22 hourly rate the maximum affordable monthly contribution under the rate of pay safe harbor rises from $257.97 to $284.86, an extra $26.88 a month per employee that you no longer have to absorb.

An hour of service under the ACA is not the same thing as an hour worked under the Fair Labor Standards Act, and the difference runs in the direction most employers do not expect. 26 CFR 54.4980H-1(a)(24) defines an hour of service as each hour for which an employee is paid for the performance of duties, and each hour for which an employee is paid or entitled to payment for a period during which no duties are performed.

The regulation then lists what that second half covers, and the list is not short: vacation, holiday, illness, incapacity including disability, layoff, jury duty, military duty and leave of absence. Every one of those hours counts toward the 130 hour full time line and toward the 120 hour equivalency divisor.

Now put that next to the overtime rule. Under the FLSA, paid leave is not hours worked at all, which is why an employee who takes eight hours of vacation and then works 36 hours has 44 paid hours and no overtime. The identical PTO hour is invisible to one federal rulebook and fully counted by the other. A part time employee sitting just under the line on worked hours can be pushed over 130 by paid leave alone, becoming a full time employee for mandate purposes without a single extra hour of work being performed.

Three categories are carved out of hours of service entirely, and they are worth knowing because each removes real people from the count. Bona fide volunteer hours do not count, which matters to nonprofit employers. Federal Work-Study hours do not count. And hours whose compensation is income from sources outside the United States do not count, which is how a US company with staff working abroad can stay under 50 despite a larger global headcount.

Common ownership collapses separate companies into a single employer for the 50 employee test. Section 4980H(c)(2)(C) applies the controlled group and affiliated service group rules of section 414(b), (c), (m) and (o), so four commonly owned companies of 20 people each are not four small employers. They are one aggregated applicable large employer of 80, and every one of them is inside the mandate.

Then the group splits apart again for everything that follows. Each company is an applicable large employer member, and liability is determined separately for each one, based only on its own full time employees. The 30 employee reduction does not go to whichever entity needs it most; it is allocated ratably across the group in proportion to each member's full time headcount. A member with 40 of the group's 200 full time employees gets 20% of the reduction, which is 6, not 30.

One more aggregation rule is easy to miss and cuts the other way, in the employee's favor. Under 26 CFR 54.4980H-1(a)(24)(iii), an hour of service for one applicable large employer member counts as an hour of service for all the others, for the whole period they are in the same group. Someone splitting time across two sister companies at 70 hours each is not two part time employees. They are one full time employee at 140 hours, owed an offer.