The Affordable Care Act for employers is not one rule. It's a set of obligations that switch on or off depending on your workforce size, how your health plan is funded, and whether the IRS counts you as an Applicable Large Employer (ALE).
Employers at or above the 50-employee threshold must offer qualifying, affordable coverage to full-time employees and file annual IRS reports, or risk penalties that increased sharply in 2026 and 2027. Employers below the threshold escape the coverage mandate but may still have reporting, notice, or state-level duties.
In this guide, you'll learn how to determine your status, what coverage and reporting rules apply to your business, what noncompliance costs in 2027, and where smaller employers fit in.
For employers, the Affordable Care Act (ACA) is primarily a set of coverage, reporting, and communication requirements tied to workforce size. The law determines whether you must offer health insurance, what that insurance must look like, what you must file with the IRS each year, and what you owe if you fall short.
The ACA touches four areas of an employer's operations:
None of this applies uniformly. Small employers generally escape the employer mandate, but applicable plan and employee-notice requirements still apply. A 60-person firm may also be subject to the employer mandate and ALE reporting requirements. That's why the first step is always determining your size under the law's counting rules.
No. The ACA only requires employers designated as Applicable Large Employers (ALE) to offer health coverage or face potential penalties. No federal law forces smaller employers to provide health insurance.
An “ALE” refers to a business that employed an average of at least 50 full-time employees, including full-time equivalent employees, during the prior calendar year. The requirement to offer coverage, known as the employer mandate or employer shared responsibility provisions, applies only to ALEs.
The catch is in the counting. Part-time employees don't need to be offered coverage, but their hours are converted into full-time equivalents that count toward the 50-employee threshold. A business with 35 full-time workers and a large part-time staff can be an ALE without realizing it.
Related businesses make the count even more complicated. Companies under common ownership are combined into a single employer when testing the 50-employee threshold, so an owner with three 20-person companies may be an ALE across all of them.
Employers below the threshold aren't entirely off the hook, either. Non-ALEs that sponsor self-insured plans (including popular level-funded plans) have IRS reporting duties, and several states impose their own filing requirements. We’ll cover small-employer responsibilities in detail later in this guide.
The ACA's rules are easier to follow once you know its vocabulary. Let’s get familiar with commonly used terminology.
With those definitions in mind, the next step is running the numbers to see whether your business is an ALE.
Employers determine ALE status by looking backward: you count your full-time employees and full-time equivalents for each month of the prior calendar year, average the monthly totals, and compare the result to 50. If the average is 50 or more, you're an ALE for the entire current calendar year.
This backward-looking test means your obligations for 2027 are set by your 2026 workforce. It also means a growing business can cross into ALE territory without any announcement or notification. The IRS expects you to know.
Count anyone averaging at least 30 hours of service per week (or 130 hours per month) as a full-time employee. Then convert part-time hours into full-time equivalents by adding up all hours of service by part-time employees in a month, capped at 120 hours per person, and dividing the total by 120.
Full-Time Equivalent Example
One clarification saves employers a lot of confusion: FTEs count toward ALE determination, but they are not people you must insure. The offer-of-coverage requirement applies only to actual full-time employees. Your part-time staff can push you over the threshold without any of them being owed coverage.
The 30-hour definition itself trips up many owners. Employees you think of as part-time because they work 32 hours a week are full-time employees in the eyes of the ACA, and they belong in your offer-of-coverage population.
Yes. Four situations regularly change the outcome of the ALE test, and each deserves a careful look before you conclude you're above or below the line.
Once you've established that you're an ALE, the question becomes what you actually have to offer.
An ALE must offer minimum essential coverage to substantially all of its full-time employees and their dependent children, and that coverage must be affordable and provide minimum value. Each of those terms has a precise definition, and each one is a separate way to fall short.
Think of it as a two-part test: who gets the offer, and what the offered plan must look like. Failing the first part risks the larger of the two penalties; failing the second risks a per-employee penalty for anyone who turns to the Marketplace instead.
An ALE must offer minimum essential coverage to its full-time employees and their dependent children up to age 26. Under the ACA’s “substantially all” standard, no more than 5% of full-time employees, or five employees, whichever is greater, can be left without an offer of coverage. Failing this threshold can expose an employer to the ACA’s largest employer shared responsibility penalty.
Dependents mean biological and adopted children through the end of the month they turn 26. Spouses are notably absent: the ACA does not require employers to offer coverage to spouses, even though many plans do so voluntarily.
The 95% standard is less forgiving than it sounds. A 100-person employer that overlooks six full-time employees, perhaps misclassifying 32-hour-a-week workers, has failed the test for those months.
Meeting the 95% offer requirement also doesn't eliminate every penalty risk. Even a compliant offer rate leaves you exposed to the second, per-employee penalty if the coverage you offered was unaffordable or below minimum value for any full-time employee who then obtained subsidized Marketplace coverage.
Employer coverage must clear two separate bars: it must be affordable, and it must provide minimum value. A plan can pass one and fail the other, and either failure creates penalty exposure.
Affordability is measured against the employee's cost for self-only coverage on your lowest-cost minimum-value plan. For plan years beginning in 2027, coverage is affordable if that contribution doesn't exceed 10.22% of the employee's household income, per IRS Revenue Procedure 2026-26. That's a significant jump from 9.96% in 2026 and the highest percentage on record, which gives employers slightly more room in setting contributions. This percentage changes every year, so contribution strategies should be re-tested annually.
Because employers don't know their employees' household incomes, the IRS provides three affordability safe harbors, which are alternative measuring sticks you can use instead:
Minimum value is the quality test. A plan provides minimum value if it covers at least 60% of the total allowed cost of benefits and includes substantial coverage of inpatient hospital and physician services.
Keep minimum essential coverage and minimum value straight, because they're different tests. MEC asks whether the plan is a recognized type of coverage at all; minimum value asks whether the plan is generous enough. A skinny plan can qualify as MEC, shielding you from the larger penalty, while still failing minimum value and exposing you to the per-employee penalty.
Offering the right coverage is half the job. Proving it to the IRS each year is the other half.
The IRS requires ACA reporting so it can verify two things: whether employers offered the coverage the law requires, and whether individuals who claimed premium tax credits were actually eligible for them. Your forms are cross-checked against your employees' tax returns, which is exactly how penalty notices get generated.
Filing responsibilities depend on your status. All ALEs must report, regardless of plan type. Non-ALEs must report only if they sponsor a self-insured plan, including level-funded arrangements.
Federal forms aren't the whole picture. California, New Jersey, Rhode Island, Massachusetts, and the District of Columbia maintain their own individual health coverage mandates with separate employer filing and furnishing requirements, and their deadlines don't always match the IRS calendar. Multi-state employers should confirm each jurisdiction's rules annually.
Four forms cover ACA reporting, and which ones you file depend on your ALE status and how your plan is funded.
Plan funding changes the details. A fully insured ALE files Forms 1094-C and 1095-C while its insurance carrier handles the B-series forms. A self-insured ALE also reports enrollment information on its 1095-Cs. A self-insured non-ALE files the B-series forms even though it has no coverage mandate.
Accurate ACA reporting depends on data most businesses keep in three or four different systems. To complete the forms correctly, you need, for every month of the year:
Disconnected systems are where filings go wrong. When payroll lives on one platform, time tracking on another, and benefits enrollment on a third, reconciling hours against coverage offers becomes a manual year-end scramble, and mismatched data produces incorrect forms.
Retention matters more than it used to. A new six-year statute of limitations on employer mandate penalties means your records need to support a filing for at least that long.
The biggest recent change is how forms reach employees. Under the Paperwork Burden Reduction Act, signed in December 2024, employers are no longer required to automatically mail Forms 1095-B and 1095-C, provided they post a timely notice that the forms are available on request. The notice must be clear and conspicuous on your website by the furnishing deadline, stay posted through October 15, and include contact information. Requested forms must go out within 30 days (or by January 31, if later).
One caution before you stop mailing: states with their own mandates haven't uniformly adopted this option. California, for example, expects employee statements by January 31. Employers with workers in mandated states may need to keep mailing forms to those employees regardless of federal relief.
Electronic filing is now effectively universal. Any employer filing 10 or more total information returns of any type must file ACA forms electronically through the IRS system, which puts nearly every ALE in the e-filing category.
Reporting rules, deadlines, and form instructions are reviewed and reissued by the IRS every year. Build an annual check of current-year requirements into your compliance calendar rather than assuming last year's process still applies.
Knowing the rules is protective. Knowing what breaking them costs makes the case for getting them right.
ACA penalties come in two distinct types: employer shared responsibility payments for failing to offer compliant coverage, and information reporting penalties for filing late, incomplete, or incorrect forms. An employer can owe both in the same year, because they punish different failures.
Both types adjust annually, and 2027 brings another increase to the employer mandate. That makes this the wrong year to guess at your ALE status or skip an affordability test.
The employer shared responsibility payments are the two penalties, defined in Internal Revenue Code Sections 4980H(a) and 4980H(b) and often called Penalty A and Penalty B, that an ALE can owe for failing to offer compliant coverage. Neither is automatic. Each is triggered only when at least one full-time employee receives a premium tax credit for Marketplace coverage.
Penalty A, Section 4980H(a), applies when an ALE fails to offer minimum essential coverage to at least 95% of full-time employees and their dependents. It's calculated across your entire full-time workforce, minus the first 30 employees, regardless of how many were actually offered coverage. That across-the-board math is what makes Penalty A the catastrophic one.
Penalty B, Section 4980H(b), applies when an ALE offers coverage that's unaffordable or fails minimum value. It's assessed only for each full-time employee who actually received a premium tax credit, and the total can never exceed the amount that Penalty A would have been.
2027 Employer Shared Responsibility Payment Amounts
Calendar year 2027, penalty fees are as follows:
These amounts are indexed and change every year. Confirm current figures before making plan decisions.
Liability is calculated month by month, not annually. An employer that fixed a coverage gap in April owes penalties for the months the gap existed, and one employee's mid-year Marketplace enrollment can start the clock.
Scale is what makes these numbers dangerous. A 100-employee ALE that fails the 95% offer test for a full year in 2027 faces $3,780 × 70 employees, or $264,600 in penalties, and the IRS actively enforces these provisions through its Letter 226-J process.
Even employers who offer perfect coverage can rack up penalties through their paperwork. Reporting failures is a separate penalty track with its own dollar amounts.
The most common filing and data errors on Forms 1094-C and 1095-C include missing or mismatched Social Security numbers, incorrect offer-of-coverage indicator codes, incorrect employee-contribution amounts, miscounted full-time employees, and late or entirely missed filings. Errors on the 1094-C's "95% offer" certification are particularly costly because that single checkbox drives Penalty A exposure.
IRS penalties add up per form. Employers may face separate penalties for failing to file required ACA information returns with the IRS and for failing to furnish required statements to employees. These penalty amounts are adjusted periodically.
IRS Letter 226-J is the notice that starts the employer mandate penalty process. It tells an ALE that the IRS believes it owes a shared responsibility payment, shows the proposed amount based on your filed forms and your employees' tax returns, and includes a response form to agree or dispute. Many proposed assessments stem from filing errors rather than actual coverage failures, which is why a prompt, well-documented response matters.
Two recent changes work in employers' favor here. The Employer Reporting Improvement Act now gives employers 90 days to respond to Letter 226-J, up from 30, and establishes a six-year statute of limitations on these penalty assessments, replacing the previous unlimited lookback. The six-year period generally begins on the due date of the applicable ACA information returns or the date they were filed, whichever is later.
When reviewing or responding to a notice, you'll need your filed Forms 1094-C and 1095-C, records of coverage offers and employee waivers, plan documents showing minimum value, contribution schedules with safe harbor calculations, and monthly hours data supporting each employee's full-time or part-time classification. Employers who kept clean records resolve these notices; employers who didn't often pay assessments they could have contested.
The penalties above assume you're an ALE. But the ACA has a different story for the businesses below the line.
Employers below the 50-FTE threshold are generally not subject to the employer mandate, meaning they can't be penalized for choosing not to offer health insurance. But "not an ALE" doesn't mean "no ACA responsibilities," and small employers who tune out the law entirely tend to get surprised.
Small employers still have several ACA touchpoints worth understanding:
Whether you're an ALE today or approaching the line, the administrative machinery behind ACA compliance is the same. That's where many businesses look for help.
ACA compliance is fundamentally a coordination challenge. The data that proves compliance lives in payroll, timekeeping, HR records, benefits eligibility files, and enrollment systems, and the IRS expects all of it to reconcile on a single set of forms. A professional employer organization (PEO), a firm that provides payroll, benefits, HR, and compliance services through a co-employment arrangement, consolidates those functions in one place.
Depending on the arrangement, a PEO may support ACA administration in several ways:
An important caveat: who is responsible for what depends on the service agreement, the benefits arrangement, the employer's ALE status, and applicable law. ALE status is generally determined at the client-employer level, even in a co-employment relationship, and a PEO relationship doesn't transfer an employer's legal obligations. The value is in the infrastructure and expertise, not a handoff of liability.
At FrankCrum, ACA support draws on the same integrated payroll, benefits, and HR platform our clients use every day, which means the data behind the forms comes from one system instead of five.
Everything in ACA compliance flows from one determination: whether your business is an Applicable Large Employer. Get that right, and the rest becomes a manageable checklist.
Remember that the load-bearing numbers, including the affordability percentage, both penalty amounts, reporting penalties, and tax credit limits, change every year, so annual verification belongs on your compliance calendar.
FrankCrum has spent 45+ years helping small and mid-sized businesses coordinate payroll, benefits, reporting, and HR administration in one place, with real people behind the technology. If ACA administration is pulling you away from running your business, we can help carry it.
Do small businesses with fewer than 50 employees have to comply with the ACA?
Businesses with fewer than 50 full-time equivalent employees are exempt from the ACA's employer mandate and cannot be penalized for not offering coverage. However, they may still have obligations. Non-ALEs with self-insured or level-funded plans must file Forms 1094-B and 1095-B, and some states impose separate reporting requirements. Small employers should still calculate their FTEs annually to confirm their status.
What is the ACA affordability percentage for 2027?
For plan years beginning in 2027, employer coverage is affordable if the employee's cost for self-only coverage on the lowest-cost minimum-value plan doesn't exceed 10.22% of household income, up from 9.96% in 2026. Under the federal poverty line safe harbor, that equals a maximum employee contribution of $135.93 per month for calendar-year plans in the contiguous states and the District of Columbia. The percentage changes annually.
What are the ACA penalties for employers in 2027?
For 2027, the Section 4980H(a) penalty is $3,780 per full-time employee per year (minus the first 30) when an ALE fails the 95% offer threshold, and at least one full-time employee receives a premium tax credit. The Section 4980H(b) penalty is $5,670 per year for each full-time employee who receives a premium tax credit because coverage was unaffordable or lacked minimum value. Separate reporting penalties per form also apply.
Do employers still have to mail 1095-C forms to employees?
Not necessarily. Under the Paperwork Burden Reduction Act, employers can instead post a clear, conspicuous notice on their website stating that forms are available on request, by the March 2 furnishing deadline, and keep it posted through October 15. Requested forms must be provided within 30 days. States with their own mandates, such as California, may still require direct furnishing.
How does an employer know if it is an Applicable Large Employer?
Average your monthly totals of full-time employees (30+ hours per week) plus full-time equivalents (part-time hours divided by 120) across the prior calendar year. If the average is 50 or more, you're an ALE for the entire current year. Businesses under common ownership must combine their workforces for this test, and a seasonal-worker exception may apply if you exceeded 50 for 120 or fewer days.
Do employers have to offer health insurance to spouses or part-time employees?
No. The ACA requires ALEs to offer coverage only to full-time employees (those averaging 30+ hours per week) and their dependent children up to age 26. Spouses are not considered dependents under the law, and the employer mandate generally does not require offers to employees classified as part-time under the applicable ACA measurement method.