Employer reporting under the Affordable Care Act is one of the most misunderstood compliance obligations facing large employers. Forms 1094-C and 1095-C are often treated as administrative paperwork, when in reality they reflect strategic decisions made months earlier about plan design, eligibility, and affordability.
When an employer receives an IRS Letter 226J proposing a penalty, the issue is rarely the form itself. The issue is what the form reveals.
To understand whose job employer reporting really is, we first have to understand what it connects to.
What Employer Reporting Connects To: The Employer Mandate
Before we talk about employer reporting, we need to understand what reporting connects to. Reporting under §6056 exists because of the employer shared responsibility requirement under §4980H — what most of us simply call the employer mandate.
The same employers who are required to file Forms 1094-C and 1095-C are the employers subject to §4980H. Reporting is not separate from the mandate. It reflects whether the employer complied with it.
The Affordable Care Act refers to this as the employer shared responsibility requirement. In everyday language, we call it the employer mandate. When you see §4980H, that’s what we’re talking about.
Section 4980H contains two potential penalties. An employer will never owe both in the same month. It is one or the other.
The A Penalty — The Sledgehammer
The first penalty, commonly referred to as the A penalty, applies when an applicable large employer fails to offer minimum essential coverage to at least 95 percent of its full-time employees and their dependent children.
That 95 percent threshold matters. If the employer misses it — even slightly — the penalty is calculated on all full-time employees, minus the first 30.
For 2026, the annualized A penalty is $3,340 per full-time employee, excluding the first 30.
Let’s walk through a simple example.
Assume an employer has 100 full-time employees. If it fails to offer minimum essential coverage to at least 95 of them, it has not met the 95 percent requirement. The penalty calculation excludes the first 30 employees, leaving 70 subject to the penalty.
Seventy multiplied by $3,340 equals $233,800 annually.
That’s why this is often called the sledgehammer penalty. It’s broad, and it’s expensive.
This penalty has nothing to do with reporting errors. It is triggered by failing to offer minimum essential coverage to at least 95 percent of full-time employees.
The B Penalty — The Tackhammer
If an employer satisfies the 95 percent offer requirement, it avoids the A penalty. But that does not mean it is finished.
The coverage offered must also provide minimum value and be affordable. If it fails either of those tests, the B penalty may apply.
You’ve described this as the tackhammer penalty, and that analogy works. Unlike the sledgehammer, which hits broadly, the tackhammer is precise. It applies only with respect to specific full-time employees who receive a premium tax credit through the Marketplace.
For 2026, the annualized B penalty is $5,010 per affected employee.
Here is a critical point: an employer does not owe a B penalty simply because coverage is expensive or because the plan design is weak. A penalty is triggered only if a full-time employee goes to the Marketplace, qualifies for a premium tax credit, and actually receives the subsidy.
If no employee receives a subsidy, there is no penalty — even if the employer’s coverage technically fails minimum value or affordability standards.
That distinction matters. The B penalty is reactive. It depends on what an individual employee does.
Minimum Essential Coverage
The A penalty hinges on one question: did the employer offer minimum essential coverage to at least 95 percent of its full-time employees?
For purposes of §4980H, minimum essential coverage simply means a group health plan that includes preventive services. It does not have to be generous. It does not have to satisfy minimum value. It just has to qualify as a group health plan.
This is why many employers use stripped-down MEC plans. These plans are often inexpensive and may not provide rich benefits, but they satisfy the 95 percent offer requirement and avoid the sledgehammer penalty.
Once minimum essential coverage is offered to at least 95 percent of full-time employees, the analysis shifts to minimum value and affordability.
Minimum Value
A plan provides minimum value if it pays at least 60 percent of the total allowed cost of benefits for a standard population and includes inpatient hospitalization coverage.
This is an actuarial value calculation, not simply coinsurance.
If a large group incurred $1,000,000 in claims, the plan would need to pay approximately $600,000, with employees collectively paying about $400,000. That is 60 percent actuarial value, roughly equivalent to a bronze-level plan.
If a plan does not meet minimum value and an employee receives a premium tax credit, the B penalty may apply.
Affordability
Even if a plan provides minimum value, it must also be affordable.
For 2026, coverage is considered affordable if the employee’s required contribution for the lowest-cost employee-only minimum value option does not exceed 9.96 percent of household income.
Employers do not know household income. They know wages. That is why the IRS created affordability safe harbors, which we will cover in detail later.
For now, understand the structure. If coverage fails minimum value or affordability, the B penalty may apply — but only if a full-time employee actually receives a subsidy.
Putting It All Together
The framework is straightforward, even if the calculations are not.
First, determine whether the employer is an applicable large employer.
Second, determine whether it offered minimum essential coverage to at least 95 percent of full-time employees and their dependent children. If it did not, the sledgehammer penalty applies.
If it did meet the 95 percent threshold, then evaluate whether the coverage provides minimum value and is affordable. If it fails those tests and an employee receives a premium tax credit, the tackhammer penalty may apply.
Everything else — reporting, subsidy determinations, IRS correspondence — flows from this structure.
Applicable Large Employer (ALE) Definition and Aggregation Rules
Before an employer ever worries about penalties or reporting, it has to determine whether it is an Applicable Large Employer. The employer mandate under §4980H applies only to ALEs. If the employer is not an ALE, the mandate does not apply and neither does §6056 reporting.
An employer is an ALE if it averaged at least 50 full-time employees, including full-time equivalents, during the preceding calendar year. That sounds simple, but the calculation has a few moving parts.
A full-time employee for employer mandate purposes is someone who averages at least 30 hours per week, or 130 hours per month. That 130-hour number comes from multiplying 30 hours by 52 weeks and dividing by 12 months.
Each full-time employee counts as one.
Part-time employees do not count individually as full-time, but their hours must still be included in the ALE calculation. The employer aggregates all part-time hours for the month and divides by 120 to determine the number of full-time equivalents.
For example, if two employees each work 15 hours per week, together they equal one full-time equivalent. If ten employees each work 15 hours per week, that is five full-time equivalents.
It is important not to confuse counting employees for ALE status with offering coverage. Part-time employees count when determining whether the employer reaches 50. However, the employer is required to offer coverage only to full-time employees.
Those are two separate exercises.
Controlled Groups and Aggregation
The analysis becomes more complicated when businesses share common ownership.
Under §414 of the Internal Revenue Code, businesses under common control must be aggregated to determine ALE status. That means a small employer with fewer than 50 employees can still be subject to the employer mandate if it is part of a larger controlled group that collectively exceeds 50 full-time employees, including full-time equivalents.
Let’s walk through an example.
Assume there are two companies under common ownership. One business has 80 full-time employees. The other has 40 full-time employees. There are no part-time employees in this example.
Individually, the 40-employee company would not meet the ALE threshold. But together, the two companies have 120 full-time employees. Because they exceed 50 as a controlled group, both entities are considered ALE members and are subject to §4980H.
Now assume the 80-employee company offers minimum essential coverage to at least 95 percent of its full-time employees. The 40-employee company offers no coverage at all.
Normally, when calculating the A penalty, an employer excludes the first 30 full-time employees from the penalty calculation. However, in an aggregated ALE group, that 30-employee reduction must be allocated proportionally among the group members.
In this example, the 40-employee company represents one-third of the total employees in the group (40 out of 120). It therefore receives one-third of the 30-employee exclusion, which equals 10 employees.
Instead of excluding 30 employees from the penalty calculation, that company may exclude only 10. The remaining 30 full-time employees would be subject to the A penalty.
At $3,340 per employee for 2026, that equals $100,200 annually.
This example illustrates why aggregation rules matter. Determining controlled group status requires applying the ownership and attribution rules under §414(b), (c), (m), and (o). Those rules can become highly technical, and brokers should be careful not to make definitive legal determinations without appropriate tax or legal guidance.
Determining Full-Time Status
Once ALE status is established, the employer must determine who qualifies as full-time for mandate purposes.
An hour of service includes each hour for which an employee is paid or entitled to payment for performing duties, as well as certain paid leave hours such as vacation, holidays, illness, disability leave, jury duty, and some military leave.
For hourly employees, employers typically track actual hours worked. For salaried employees, the employer may either track actual hours or use a reasonable equivalency method, such as a days-worked equivalency, provided it is applied consistently.
The 30-hour threshold is fixed under §4980H. Even if an employer defines full-time as 32 hours for plan eligibility purposes, the mandate still measures full-time status at 30 hours per week. If employees regularly work 30 hours and are not offered coverage because the employer uses a 32-hour internal definition, those employees still count toward the 95 percent offer requirement.
That mismatch can create an A penalty issue.
In Texas, fully insured plans are further constrained because state rules also define full-time at 30 hours, limiting flexibility in eligibility definitions.
Monthly Measurement vs. Look-Back Measurement
After defining hours of service, the employer must decide how to measure full-time status. The regulations permit either the monthly measurement method or the look-back measurement method.
Under the monthly measurement method, the employer counts hours each calendar month. If an employee averages at least 130 hours during that month, coverage must be offered for that month.
This method works well when schedules are stable. It becomes more difficult when hours fluctuate, because the employer may not know until the end of the month whether the employee averaged 130 hours. That timing can create operational challenges.
For employers with variable-hour employees, the look-back measurement method provides greater predictability.
Under this approach, the employer establishes a measurement period of up to 12 months, an optional administrative period of up to 90 days, and a corresponding stability period.
During the measurement period, the employer tracks hours. If the employee averages at least 130 hours per month during that period, the employee must be treated as full-time for the entire stability period, regardless of actual hours worked during that stability period.
For example, assume a calendar-year renewal effective January 1. The employer might use a measurement period running from December 1 through November 30, followed by an administrative period in December. The stability period would then run from January 1 through December 31.
If the employee averaged 130 hours during the measurement period, coverage must be offered for the entire stability period, even if the employee’s hours drop later.
These cycles operate continuously. While December serves as the administrative period for one measurement cycle, it simultaneously begins the next measurement cycle.
For newly hired variable-hour employees, employers may use an initial measurement period of up to 12 months before determining full-time status.
These measurement decisions are not just operational details. They directly affect reporting. Forms 1094-C and 1095-C reflect whether employees were considered full-time, whether coverage was offered, and whether affordability standards were satisfied.
Reporting documents the compliance strategy the employer chose throughout the year.
Affordability Safe Harbors and IRS Enforcement
Avoiding the sledgehammer penalty is only the first step. Once an employer offers minimum essential coverage to at least 95 percent of its full-time employees, the analysis shifts to minimum value and affordability.
If coverage fails either of those standards and a full-time employee receives a premium tax credit, the tackhammer penalty may apply.
For 2026, coverage is considered affordable if the employee’s required contribution for the lowest-cost employee-only minimum value option does not exceed 9.96 percent of household income.
That phrase — household income — is where the practical challenge begins.
Employers do not know household income. They know what they pay the employee. They do not know a spouse’s income, side income, investment income, or other earnings that factor into the employee’s tax household.
To address that problem, the IRS created three affordability safe harbors. If an employer satisfies any one of them, coverage is deemed affordable for employer mandate purposes, even if the employee’s actual household income would produce a different result.
The W-2 Safe Harbor
Under the W-2 safe harbor, the employee’s annual required contribution for employee-only coverage cannot exceed 9.96 percent of the wages reported in Box 1 of the employee’s Form W-2.
This method ties affordability directly to taxable wages.
The advantage is that it reflects actual earnings. The disadvantage is that Box 1 wages are not known until year-end. Overtime fluctuations, unpaid leave, and pre-tax deductions can all affect Box 1 wages, which means the employer is effectively calculating affordability in hindsight.
Employers using this method must monitor contributions carefully to avoid accidental noncompliance.
The Rate-of-Pay Safe Harbor
The rate-of-pay safe harbor is often simpler operationally.
For hourly employees, the employer multiplies the employee’s hourly rate of pay by 130 hours per month to determine deemed monthly income. The employee’s required monthly contribution for employee-only coverage cannot exceed 9.96 percent of that amount.
For example, if an employee earns $15 per hour, multiplying $15 by 130 hours produces $1,950 per month. Applying the 9.96 percent threshold results in a maximum affordable contribution of $194.22 per month.
If the required contribution does not exceed $194.22, coverage is affordable under the rate-of-pay method.
For salaried employees, the monthly salary is used directly rather than multiplying by 130 hours.
This method provides more predictability because it is based on a fixed rate rather than year-end wages.
The Federal Poverty Line Safe Harbor
The third option is the federal poverty line safe harbor.
Under this approach, affordability is based on the federal poverty level for a single individual. The employer calculates 9.96 percent of the annual federal poverty level and divides that figure by 12 to determine the maximum monthly employee contribution.
Because the poverty level amount is relatively low, this method is the most conservative. If an employer sets its employee contribution at or below the federal poverty line threshold, coverage will almost always satisfy affordability under the other two safe harbors as well.
The tradeoff is cost. Using the federal poverty line safe harbor often requires a higher employer subsidy.
Employers must select and apply safe harbors consistently for reasonable categories of employees, such as hourly versus salaried workers. These are strategic decisions made during plan design and contribution modeling — not during reporting season.
Dependent Coverage
The employer mandate requires offering coverage to full-time employees and their dependent children up to age 26. Spouses are not required to be offered coverage under §4980H.
The requirement is to offer coverage, not necessarily to subsidize it. However, if dependent children are not offered coverage and the employer therefore falls below the 95 percent threshold, the sledgehammer penalty can apply.
This detail often surfaces only when reviewing Forms 1094-C and 1095-C or responding to an IRS notice. It is easy to overlook during plan design but can have significant consequences.
The 95 Percent Cliff
It is worth revisiting the 95 percent threshold because of how unforgiving it can be.
Offering minimum essential coverage to at least 95 percent of full-time employees avoids the A penalty. Falling to 94 percent can trigger the sledgehammer penalty across the full-time workforce, subject to the 30-employee reduction.
This creates a cliff effect. A small administrative error — misclassifying employees, mishandling waiting periods, failing to track hours properly, or incorrectly defining eligibility — can produce a large financial consequence.
Employer mandate compliance is not just about having a plan in place. It requires disciplined operational execution throughout the year.
IRS Letter 226J
Penalties are not automatically assessed at year-end. Instead, the IRS uses employer reporting data and Marketplace subsidy information to determine whether a potential penalty exists.
If the IRS believes a penalty may apply, it issues Letter 226J proposing an assessment under §4980H. The letter identifies the months and employees involved. It is not a bill, but it does require a response.
Employers may agree with the proposed assessment or dispute it. Common dispute reasons include demonstrating that the employee was not full-time, that coverage was offered but declined, that an affordability safe harbor was satisfied, or that reporting codes were incorrect.
Responding successfully requires documentation. The employer must be able to show how full-time status was measured, what coverage was offered, how contributions were calculated, and which affordability safe harbor was applied.
This is where reporting becomes evidentiary. The forms are not just administrative filings. They are the record the IRS uses to evaluate compliance.
§6056 and §6055 Reporting Requirements
Everything we’ve discussed — the 95 percent threshold, minimum value, affordability, and safe harbors — ultimately shows up in employer reporting.
Sections 6056 and 6055 of the Internal Revenue Code establish separate but related reporting requirements. Understanding the difference between them is critical.
Section 6056 applies to applicable large employers. It requires reporting whether coverage was offered to full-time employees and whether that coverage met minimum value standards. This section ties directly to §4980H and the employer mandate penalties.
Section 6055, by contrast, focuses on enrollment. It requires reporting which individuals were actually covered by minimum essential coverage during the year.
In a fully insured large group plan, the insurance carrier handles §6055 reporting and issues Forms 1095-B to covered individuals. The employer handles §6056 reporting using Forms 1094-C and 1095-C.
In a self-insured or level-funded arrangement, the employer handles both §6056 and §6055 reporting. In those cases, enrollment information is reported in Part III of Form 1095-C.
This distinction is frequently misunderstood, particularly with level-funded plans that are marketed as partially insured. For reporting purposes, level-funded plans are treated as self-insured. The employer — not the carrier — is responsible for reporting covered individuals.
Forms 1094-C and 1095-C
Form 1095-C is the employee-level reporting form. It reports, month by month, whether coverage was offered, whether it provided minimum value, and the employee’s required contribution for the lowest-cost employee-only option.
Employees use this form when filing their individual tax returns, and the IRS uses it to evaluate premium tax credit eligibility.
Form 1094-C is the transmittal filed with the IRS. It summarizes employer-level data, including whether the employer is part of an aggregated ALE group, how many full-time employees it had each month, and whether coverage was offered to at least 95 percent of full-time employees.
The coding on Form 1095-C reflects the mandate framework.
Line 14 identifies the type of offer made for each month.
Line 15 reports the employee’s required contribution.
Line 16 includes indicator codes explaining why a penalty should not apply for a particular month, such as when the employee was not full-time, was in a waiting period, or when an affordability safe harbor was satisfied.
Accuracy on these lines matters. Incorrect coding can trigger a proposed penalty even if the employer complied in practice.
Electronic filing is required for employers filing 10 or more information returns in aggregate. Forms 1095-C must generally be furnished to employees by early March, and Forms 1094-C and 1095-C must be filed with the IRS by late February if filing on paper or March 31 if filing electronically.
Failing to file or furnish forms can trigger separate reporting penalties under §§6721 and 6722, even if no employer mandate penalty applies.
Reporting Is the Enforcement Mechanism
Employer reporting is not separate from the mandate. It is the enforcement mechanism.
When employees apply for premium tax credits through the Marketplace, they indicate whether they were offered employer coverage. The Marketplace shares subsidy data with the IRS. The IRS compares that data with employer filings.
If an employee receives a premium tax credit and employer reporting suggests coverage was not offered, was not affordable, or did not provide minimum value, the employer may receive Letter 226J proposing a penalty.
Accurate reporting can prevent penalties. Inaccurate reporting can create proposed penalties even when the employer’s underlying compliance decisions were sound.
The forms are not merely administrative. They are evidentiary.
Whose Job Is It?
This brings us back to the central question: whose job is employer reporting?
Legally, it is the employer’s responsibility.
Even if a payroll vendor, benefits administration platform, third-party administrator, or compliance vendor assists with preparation and filing, the employer signs the forms and certifies their accuracy. The obligation does not transfer simply because a service provider is involved.
That does not mean brokers are responsible for filing Forms 1094-C or 1095-C. It does mean brokers often sit at the intersection of the decisions that determine what appears on those forms — plan design, contribution levels, measurement methods, eligibility definitions, and affordability strategy.
When an employer asks, “Are we compliant?” the answer depends on how full-time status was measured, whether coverage was offered to at least 95 percent of full-time employees, whether minimum value was satisfied, which affordability safe harbor was applied, whether dependent coverage was offered properly, and whether reporting forms were completed correctly.
Those decisions are made throughout the year, not just at filing time.
A broker who designs a plan that fails minimum value, or recommends contribution levels that fail affordability, may not be legally responsible for penalties. But when a Letter 226J arrives, the client will look to the broker for answers.
This is why understanding §4980H and reporting requirements is not optional for agents working with large employers.
At its core, employer reporting reflects strategic compliance decisions made months earlier. The employer signs the forms. The IRS enforces the mandate through them. Anyone advising large employers must understand how everything connects.