The Affordable Care Act has been the law of the land since 2010, yet ACA compliance still catches business owners off guard every year. A missed filing, a misclassified employee, or a coverage offer that falls just short of the affordability threshold can trigger five-figure IRS penalties — and the agency has become increasingly aggressive about enforcement. If you employ 50 or more full-time equivalent workers, understanding your ACA employer reporting obligations is not optional. Here is a clear, no-jargon breakdown of what you need to know.

Who Is Subject to the ACA Employer Mandate?

The employer shared responsibility provisions apply to Applicable Large Employers (ALEs) — organizations with 50 or more full-time employees, including full-time equivalents (FTEs), on average during the prior calendar year. Part-time hours matter: you calculate FTEs by adding total part-time hours worked in a month, dividing by 120, and adding that figure to your full-time headcount. Growing businesses often cross the ALE threshold without realizing it, so running this calculation annually is essential.

Once you qualify as an ALE, you are required to offer minimum essential coverage (MEC) that meets minimum value standards and is considered affordable to full-time employees and their dependents. For 2024, a plan is considered affordable if the employee's premium contribution for self-only coverage does not exceed 8.39% of their household income — though most employers rely on one of the IRS safe harbors tied to W-2 wages, hourly rates, or the federal poverty level.

Understanding Forms 1094-C and 1095-C

The backbone of ACA employer reporting is two IRS forms that ALEs must file each year:

  • Form 1095-C — An individual statement furnished to each full-time employee detailing the coverage offered, the lowest-cost premium available, and the months coverage was in effect. Think of it as the health-coverage equivalent of a W-2.
  • Form 1094-C — The transmittal form sent to the IRS summarizing your organization's offer of coverage across the entire workforce. It accompanies all 1095-C forms submitted to the IRS.

Employers who sponsor self-insured plans must also complete Part III of Form 1095-C to report actual enrollment information. Fully insured employers can leave that section to the carrier, who files Forms 1094-B and 1095-B instead.

ACA Reporting Deadlines You Cannot Miss

Deadlines shift slightly each year, but the general calendar looks like this:

  1. January 31 — Furnish Form 1095-C to each full-time employee for the prior calendar year.
  2. February 28 — Paper filing deadline for Forms 1094-C and 1095-C with the IRS (paper filers only).
  3. March 31 — Electronic filing deadline with the IRS. ALEs filing 10 or more returns are now required to file electronically.

Late or incorrect filings carry penalties ranging from $60 to $330 per return, depending on how late the correction is made, with annual caps that can still reach hundreds of thousands of dollars for larger employers. Willful neglect removes the cap entirely.

Common ACA Compliance Pitfalls

Even well-intentioned employers run into trouble. Watch out for these frequent missteps:

  • Miscounting FTEs. Variable-hour and seasonal employees are easy to undercount, leading companies to believe they are below the 50-employee threshold when they are not.
  • Affordability miscalculations. Using the wrong safe harbor or failing to update premium contribution amounts when wages change can make an otherwise compliant plan unaffordable on paper.
  • Incorrect indicator codes on 1095-C. Lines 14, 15, and 16 require specific codes that describe the type of coverage offered and any applicable safe harbors. Wrong codes can trigger IRS inquiries even when coverage was genuinely compliant.
  • Missing the look-back measurement period. For variable-hour employees, employers must use an IRS-approved measurement period to determine full-time status. Skipping this step leads to coverage gaps and potential penalties.
  • Ignoring IRS Letter 226-J. This is the preliminary notice that the IRS proposes an employer shared responsibility payment. Employers have only 60 days to respond. Missing that window is costly.

How Outsourcing ACA Administration Reduces Your Risk

Staying current with ACA reporting obligations demands accurate payroll data, benefits eligibility tracking, and timely filing — all coordinated across departments that often do not communicate seamlessly. Many business owners and HR managers find themselves assembling spreadsheets and chasing down carrier confirmations in January, exactly when the rest of the new year demands attention.

An Administrative Services Organization like Nomad Partners manages ACA compliance as part of an integrated payroll and benefits administration service. That means your employee data, coverage offers, and premium amounts are tracked throughout the year — not reconstructed at filing time. We generate and distribute 1095-C forms, prepare the 1094-C transmittal, and file electronically with the IRS on your behalf, so you are never scrambling against a deadline.

Take ACA Compliance Off Your Plate

ACA employer reporting is complex, deadline-driven, and unforgiving of errors — but it does not have to be your problem to solve alone. Whether you are an Applicable Large Employer navigating your first filing year or a seasoned HR team looking to eliminate manual risk, Nomad Partners can help you build a compliant, efficient process from the ground up.

Ready to simplify your ACA compliance and employer reporting obligations? Talk to a Nomad Partners specialist today and find out how we take the complexity out of ACA administration so you can focus on running your business.