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More than a decade in, most employer confusion still traces back to two questions: are you an applicable large employer, and who are your full-time employees in each month? Nearly every IRS penalty notice is downstream of one of those answers being wrong.
ACA obligations sit in three separate layers, and an employer can be fully compliant on one while facing six-figure exposure on another. Pay-or-play determines whether you must offer coverage; information reporting under sections 6055 and 6056 determines what you tell the IRS; and a set of plan-level requirements applies regardless of size. Protecting the 95 percent offer rate is the single highest-value control — the (a) penalty multiplies across your whole full-time workforce, while the (b) penalty reaches only the employees who actually obtain a subsidy. Penalty amounts index upward every year, enforcement is automated and looks backward, and recent legislation extended the assessment window to six years.
Before anything else in the Affordable Care Act makes sense, two questions must be answered: are you an applicable large employer, and if so, who are your full-time employees in each month. Nearly every penalty notice the IRS issues is downstream of one of those two answers being wrong.
It helps to keep the three layers of obligation apart. The employer shared responsibility provisions — pay-or-play — determine whether you must offer coverage and what happens if you do not. The information reporting provisions under Internal Revenue Code sections 6055 and 6056 determine what you must tell the IRS and your employees. And a set of market reform and disclosure requirements applies to the health plan itself regardless of your size.
Enforcement is automated, and it looks backward. The IRS matches Forms 1094-C and 1095-C against individual returns claiming a premium tax credit. Assessments arrive by letter — Letter 226-J proposing a shared responsibility payment, Letter 5699 for apparent failure to file, Notice 972CG for information return penalties — often two to three years after the coverage year. With the statute of limitations on shared responsibility assessments now at six years, the coding decisions your team makes this January remain live exposure at the end of the decade.
You are an applicable large employer for a calendar year if you employed an average of 50 or more full-time employees, including full-time equivalents, during the preceding calendar year. Note the lookback — your 2027 obligations are determined by your 2026 workforce.
For each calendar month, count employees averaging at least 30 hours of service per week, or 130 hours per month.
Total the hours of employees who were not full-time, counting no more than 120 for any one individual, divide by 120, and round down.
Add the two figures for each month and average across the year. Fifty or more makes you an ALE for the following calendar year.
Any hour paid or entitled to payment — including vacation, holiday, illness, disability, layoff, jury duty, military duty, and leave. Paid leave, compensated on-call time, and hours worked by employees who declined coverage are the ones most often missed.
If your workforce exceeds 50 for 120 days or fewer and the excess were seasonal workers, you are not an ALE. Four calendar months may be treated as 120 days — but the exception fails at 121.
All entities in a controlled or affiliated service group are combined. Three restaurants under common ownership with 22, 19, and 14 employees are one ALE with 55 — then each member files under its own EIN, and penalties compute at the member level.
The 30-employee reduction is allocated, not duplicated. The reduction used in the section 4980H(a) calculation is spread across the members of an aggregated group in proportion to each member’s full-time count. A group with three members does not get 90 free employees.
Neither penalty is triggered by the employer’s conduct alone. Both require that at least one full-time employee actually enroll in Marketplace coverage and receive a premium tax credit — which is why employee-level data accuracy matters as much as plan design.
The asymmetry is the point. A 200-employee ALE that misses the 95 percent threshold by a single month faces annualized (a) exposure on 170 employees, while the same employer that offers broadly but prices one class slightly above the affordability line faces (b) exposure only on those who go to the Marketplace and qualify. Protecting the 95 percent offer rate is therefore the highest-value control in ACA compliance.
The premium tax credit landscape changed on January 1, 2026. The enhanced credits enacted in 2021 and extended through 2025 expired on December 31, 2025, and were not extended. Subsidy eligibility reverted to the original ACA structure: households above 400 percent of the federal poverty level are again ineligible, and subsidized enrollees at every income level pay a materially larger share of premium. Three consequences follow — penalty trigger probability shifted rather than disappeared (higher earners can no longer trigger a (b) penalty at all, but lower-wage workers, the ones most likely to face an unaffordable contribution, remain credit-eligible); expect increased demand for your plan as employees return from the Marketplace, so budget for higher enrollment at renewal; and do not relax the offer — the 95 percent test, the safe harbors, and the reporting obligations are all unchanged.
Coverage is affordable if the employee’s required contribution for the lowest-cost, self-only, minimum-value option does not exceed the applicable percentage of household income. Because no employer knows household income, three safe harbors may be used instead — applied uniformly and consistently to every employee within any reasonable category.
8.39% for 2024, 9.02% for 2025, 9.96% for 2026, and 10.22% for 2027 — the first time above 10 percent. Rebuild your model each year rather than carrying forward last year’s assumptions.
One flat dollar figure for everyone, based on the mainland single FPL in effect within six months before the plan year. The most conservative and by far the easiest to administer and audit.
Hourly rate × 130 hours, or monthly salary, computed at the start of the year using the lowest rate. Suited to stable wage structures — note that a mid-year rate reduction can invalidate it for that employee.
Box 1 wages, adjusted for partial-year coverage, determined retrospectively. Workable for higher-paid, stable workforces, but the weakest planning tool because the result cannot be confirmed until after year end.
A worked example for the 2026 plan year. An employee paid $19.00 per hour: $19.00 × 130 hours = $2,470.00 in assumed monthly wages. Applying 9.96 percent gives a maximum employee contribution of $246.01 per month. Charge $260 and coverage is unaffordable for that employee under the rate-of-pay safe harbor — if they obtain a subsidy, the (b) penalty applies at $417.50 for each month affected. One employee for twelve months is $5,010. Across a class of 40 similarly situated employees who obtain subsidies, $200,400.
Affordability is not a plan-level determination. It is evaluated for each full-time employee for each month. Mid-year hires, rate reductions, transfers between locations with different contribution schedules, and changes in tobacco or wellness surcharges can each move a single employee across the line while the plan as a whole remains compliant. Wellness incentives other than tobacco are assumed not earned when testing; tobacco surcharges are assumed earned.
Two obligations are often conflated. Section 6056 requires every ALE Member to report its offers of coverage on Forms 1094-C and 1095-C, whether or not it offers a plan. Section 6055 requires the entity providing minimum essential coverage to report actual enrollment — the carrier does this for fully insured plans, while a self-insured ALE reports enrollment in Part III of its own Form 1095-C.
Forms 1095-C to full-time employees, reflecting a permanent automatic 30-day extension from January 31. No further extension is available.
Through the IRS AIR system. Any filer submitting 10 or more information returns in aggregate — W-2s, 1099s, 1098s, and 1095s combined — must file electronically, which makes it universal in practice for ALEs.
A two-character code describing what was offered to the employee, spouse, and dependents each month. This is the line that establishes whether you met the 95 percent test.
Not the cost of the plan the employee elected, and not the family rate. Entering the elected plan's cost here is one of the most common and most expensive errors on the form.
Employee not employed, in a limited non-assessment period, enrolled, or covered by a safe harbor. A blank Line 16 in a month where Line 14 shows an offer invites an assessment even when the employer did everything right.
Tie three numbers per month: the full-time count on Form 1094-C, the number of 1095-Cs showing an offer code, and carrier or TPA enrollment. If they do not agree, something is wrong — and it is far cheaper to find it in February than in a 226-J two years later.
The alternative manner of furnishing — and the state trap. The Paperwork Burden Reduction Act allows an ALE to stop automatically mailing Form 1095-C, instead posting a clear, conspicuous notice on its benefits website by the furnishing deadline, keeping it posted through October 15, and furnishing forms on request within 30 days. But several states with individual mandates — California, New Jersey, Rhode Island, Massachusetts, and the District of Columbia — maintain their own rules and may not recognize the federal method. A multi-state employer can end up mailing in some states and posting in others. Confirm each jurisdiction before changing your process.
Two 2024 statutes also improved the employer’s position materially: a taxpayer identification number may be substituted with full name and date of birth after reasonable attempts; electronic furnishing consent remains valid until affirmatively revoked; the response window for Letter 226-J is now at least 90 days rather than 30; and assessments are subject to a defined six-year limitations period, where previously the IRS took the position that none applied at all.
Alternative designs worth modeling in 2026. The One Big Beautiful Bill Act made the largest changes to HSA eligibility since HSAs were created: pre-deductible telehealth relief is now permanent; bronze and catastrophic plans are treated as HDHPs as of January 1, 2026; and a qualifying direct primary care arrangement no longer disqualifies HSA eligibility. Together these make ICHRA plus a bronze plan plus employee HSA contributions a coherent design for the first time — the employer funds premium through the ICHRA, the employee builds tax-advantaged savings, and pre-deductible telehealth and DPC sit alongside without breaking eligibility.
Why employers bring ACA work to GCI: ACA compliance is where plan design, payroll data, and tax reporting intersect — and where a broker who understands all three is worth considerably more than one who understands only insurance. Group Coverage, Inc. runs the ALE and controlled group analysis, models affordability under each safe harbor before renewal, designs and documents the measurement method, reconciles counts and codes before transmission, and helps assemble the offer evidence that resolves most proposed assessments.
For the primary sources, see the IRS on employer shared responsibility, the annual revenue procedures setting the indexed figures, and the AIR filing system; the Employee Benefits Security Administration on SBC and market reform requirements; and HealthCare.gov on Marketplace enrollment and premium tax credits.
That one calculation is the fastest read on your §4980H(b) exposure for the 2026 plan year — and it changes again in 2027. Group Coverage, Inc. will run your ALE determination, test affordability under each safe harbor, and review your offer rate and Form 1095-C coding before your next renewal, at no cost.
This article is for general educational purposes and is not legal, tax, or accounting advice. Indexed dollar amounts, affordability percentages, filing deadlines, and agency guidance change frequently, and requirements vary by employer size, plan funding arrangement, and jurisdiction. Confirm current figures and consult qualified counsel or a tax advisor before acting on any item discussed here.
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