ACA: Frequently Asked Questions

The Affordable Care Act generates a high volume of compliance questions because it touches employers, individuals, insurers, and government agencies simultaneously. This page addresses the most common points of confusion across employer mandate obligations, reporting requirements, marketplace mechanics, and enforcement procedures. The answers draw on published guidance from the IRS, HHS, and DOL — the three federal agencies with primary enforcement jurisdiction over ACA provisions.

What triggers a formal review or action?

The most common enforcement trigger for employers is receipt of IRS Letter 226-J, a penalty assessment notice issued when the IRS determines that a full-time employee received a premium tax credit through the Health Insurance Marketplace and the employer may owe an Employer Shared Responsibility Payment (ESRP) under IRC §4980H. The IRS matches Form 1095-C data against Marketplace enrollment records to generate these assessments. Penalties under §4980H(a) — triggered when no coverage is offered to at least 95% of full-time employees — are indexed annually; for 2024, the amount is $2,970 per full-time employee (minus the first 30), per year (IRS §4980H guidance, Revenue Procedure 2023-29).

On the individual and marketplace side, formal eligibility reviews are triggered when reported income deviates significantly from advance premium tax credit projections, prompting reconciliation on Form 8962 at tax filing. HHS and state-based marketplaces also conduct special enrollment period (SEP) verification audits when documentation of qualifying life events cannot be confirmed.

How do qualified professionals approach this?

Benefits attorneys, certified employee benefit specialists (CEBS), and licensed insurance brokers with ACA-specific training approach compliance in three structured phases. First, they conduct an Applicable Large Employer (ALE) determination — counting full-time and full-time equivalent employees across all controlled group members under IRC §414 rules to establish whether the mandate applies. Second, they audit plan design against the affordability and minimum value standards under §36B regulations. Third, they review annual 1094-C and 1095-C filings for accuracy before submission deadlines.

Professionals coordinating multi-location or multi-entity organizations also cross-reference the controlled group and affiliated service group rules because employee counts aggregate across related entities, not just the single employer filing the returns.

What should someone know before engaging?

Before engaging a benefits consultant or filing counsel, employers need to establish four data sets: (1) a complete headcount of all workers by classification — full-time, part-time, seasonal, and variable-hour; (2) historical hours records for at least 12 months to support measurement period calculations; (3) all existing plan documents, including summary plan descriptions and insurance carrier certificates; and (4) any prior IRS correspondence, including previously received Letter 226-J notices or acknowledgment letters.

Individuals seeking marketplace assistance should understand the distinction between enrollment pathways. Navigators are federally funded, must complete HHS-certified training, and cannot recommend specific plans, while licensed brokers are compensated by carriers and can make product recommendations. Both are described in Navigators, Brokers, and Certified Application Counselors. The income threshold for premium tax credit eligibility spans 100% to 400% of the federal poverty level under the original statute, though the American Rescue Plan Act of 2021 temporarily removed the 400% ceiling.

What does this actually cover?

The ACA's coverage mandates operate on two distinct tracks. For employer-sponsored plans, coverage must satisfy the essential health benefits framework across 10 statutory categories — including emergency services, maternity and newborn care, mental health and substance use disorder services, and prescription drugs. For fully insured plans sold in the individual and small group markets, all 10 categories must be covered. Self-insured large group plans are not required to cover all 10 essential health benefit categories under federal law, though they remain subject to annual and lifetime limit prohibitions.

For marketplace plans, coverage is further stratified by metal tier — Bronze, Silver, Gold, and Platinum — representing actuarial values of approximately 60%, 70%, 80%, and 90% respectively, per 45 CFR §156.140. Catastrophic plans exist as a separate category available to individuals under age 30 or those with qualifying hardship exemptions.

What are the most common issues encountered?

ALE misclassification is the most frequently cited employer compliance failure. Employers that operate through holding company structures sometimes count employees entity-by-entity rather than aggregating across the controlled group, resulting in an incorrect conclusion that the mandate does not apply. The IRS controlled group aggregation rules under IRC §414(b), (c), (m), and (o) treat related entities as a single employer for ALE threshold purposes.

Affordability calculation errors represent the second most common problem. Employers applying the W-2 safe harbor to employee contributions that exceed 9.02% of Box 1 wages (the 2023 threshold per IRS Rev. Proc. 2022-34) inadvertently expose themselves to §4980H(b) penalties. Variable-hour employee misclassification — failing to apply measurement and stability periods — and late or inaccurate 1095-C filings round out the most common issues. The penalty for failure to file a correct information return is $310 per return for 2023, with a maximum of $3,783,000 per year for large filers (IRS Publication 1586).

How does classification work in practice?

Classification under the ACA operates at the employer level and the employee level simultaneously. At the employer level, the ALE determination requires aggregating hours of service across all entities in a controlled group during a preceding calendar year. An employer with 48 full-time equivalent employees across two LLCs under common ownership is an ALE subject to §4980H even though neither entity alone crosses the 50-employee threshold. The applicable large employer determination page covers this calculation in full.

At the employee level, workers are classified as full-time (averaging 30 or more hours of service per week, or 130 hours in a calendar month per IRS Notice 2012-58), part-time, or variable-hour. Variable-hour and seasonal employees must be run through an initial measurement period of 3 to 12 months before their status is determined for a corresponding stability period. This look-back measurement method is distinct from the monthly measurement method, and employers must apply one method consistently across a defined category of employees.

What is typically involved in the process?

Annual ACA compliance for an ALE follows a defined sequence:

1. ALE determination — Confirm controlled group membership and calculate full-time equivalents for the prior calendar year using the method described in how to count full-time equivalent employees.
2. Measurement period administration — Run look-back or monthly measurement for variable-hour employees and lock in stability period status.
3. Plan design review — Confirm that at least one plan offering meets minimum value (covering at least 60% of total allowed costs) and affordability under one of the three IRS safe harbors.
4. Offer of coverage — Extend compliant offers to at least 95% of full-time employees and their dependents by the first day of the applicable plan year.
5. Data collection — Gather indicator codes for each employee's coverage situation to populate Lines 14, 15, and 16 on Form 1095-C.
6. Filing — Submit Form 1094-C and all 1095-C forms to the IRS by the applicable deadline (February 28 for paper filers, March 31 for electronic filers under 26 CFR §301.6056) and furnish copies to employees by January 31.
7. Penalty response — If Letter 226-J is received, respond within 90 days using the ESRP Response Form (Form 14764), correcting any errors and contesting incorrect employee-level data.

The full overview of the ACA home page provides a structured navigation path across each of these compliance areas.

What are the most common misconceptions?

Misconception 1: Offering any health plan satisfies the employer mandate. Offering a plan that employees cannot afford or that does not meet minimum value does not avoid §4980H(b) penalties if an employee goes to the Marketplace and receives a tax credit. The plan must clear both the affordability threshold (employee premium for self-only coverage ≤ a specified percentage of household income, with safe harbor proxies permitted) and the 60% minimum value floor.

Misconception 2: Grandfathered plans are permanently exempt. Grandfathered plan status under 45 CFR §147.140 is lost when a plan makes significant changes to cost-sharing, benefits, or employer contribution levels. Once grandfathered status is lost, it cannot be regained.

Misconception 3: The individual mandate is still in force nationally. The Tax Cuts and Jobs Act of 2017 reduced the federal shared responsibility payment to $0 effective January 1, 2019. However, 5 states — California, Massachusetts, New Jersey, Rhode Island, and Vermont — plus the District of Columbia have enacted their own individual mandate requirements with separate penalties.

Misconception 4: Part-time employees are never counted. Part-time hours are aggregated and converted to full-time equivalents for ALE threshold purposes — 120 part-time employees each working 10 hours per week collectively add the equivalent of 30 full-time employees to the employer's count.

Misconception 5: The ACA only affects large companies. Small employers below the ALE threshold are not subject to the employer mandate but remain subject to ACA market reforms on any fully insured plan they offer, including the prohibition on annual and lifetime dollar limits on essential health benefits and the requirement to cover dependents to age 26 under PHS Act §2714.

The law belongs to the people. Georgia v. Public.Resource.Org, 590 U.S. (2020)