ACA Reporting for Employers: Requirements, Deadlines, and Common 1095-C Coding Scenarios Explained

Introduction

For many employers, ACA reporting remains one of the most complex and time-consuming compliance obligations tied to employee benefits. While the rules themselves are relatively structured, the challenge often lies in applying them correctly across real-world scenarios like new hires, variable-hour employees, or status changes.

This complexity is compounded by the fact that ACA reporting is not a single requirement, but a combination of obligations that depend on employer size, funding structure, and workforce dynamics. Missteps—especially in coding or filing—can lead to IRS penalties that are difficult and costly to unwind.

This article breaks down the key components of ACA reporting, including who must file, which forms apply, and how to approach common coding scenarios. It also highlights areas where employers tend to make mistakes and what to watch for before submitting filings.

Key Takeaways

• ACA reporting applies to both Applicable Large Employers (ALEs) and employers with self-funded health plans—even if they are under 50 employees
• Most employers must file electronically and often rely on third-party vendors to manage reporting and submission
• The most complex part of reporting is completing Form 1095-C accurately, especially lines 14, 15, and 16
• Affordability is only a risk when employees waive coverage and obtain subsidized exchange coverage
• Errors in Form 1094-C, particularly failing to confirm 95% offer coverage, can trigger significant penalties
• Employee status changes (full-time to part-time, leaves of absence, etc.) are a primary source of reporting mistakes

Who Is Required to Complete ACA Reporting?

Two Separate Reporting Obligations

ACA reporting applies to two distinct employer groups:

1. Applicable Large Employers (ALEs)

• Employers averaging 50 or more full-time equivalent employees (FTEs) in the prior calendar year
• Required to report offers of coverage to full-time employees

2. Employers with Self-Funded Plans

• Includes level-funded and partially self-funded plans
• Required to report individuals actually covered under the plan

An employer may fall into:

• One category
• Both categories
• Neither

Even smaller employers (under 50 employees) must report if they sponsor a self-funded plan.

What About Controlled Groups?

For employers with multiple entities under common ownership:

• ALE determination: All employees across entities are combined
• Reporting requirement: Each entity files separately using its own EIN

This often creates confusion, particularly for smaller entities within a larger group that must still complete full reporting.

Which ACA Forms Should Employers Use?

The forms required depend on employer type and plan structure:

• ALE (Fully Insured)
  • Form 1094-C
  • Form 1095-C (Parts I & II)
• ALE (Self-Funded)
  • Form 1094-C
  • Form 1095-C (Parts I, II, & III)
• Non-ALE (Self-Funded)
  • Form 1094-B
  • Form 1095-B
• Non-ALE (Fully Insured)
  • No reporting required

Filing vs. Distribution: Two Separate Responsibilities

Filing Requirements

• Electronic filing is now required for nearly all employers
• Most employers engage a vendor for:
  • Full-service reporting and filing
  • Filing-only support (employer provides coding)

Distribution Requirements

Employers must also provide forms to employees using one of three methods:

• Mail
• Electronic delivery (with employee consent)
• Notice of Availability (public website posting with request instructions)

Important: The notice option only replaces distribution—not preparation or filing.

Key ACA Reporting Deadlines

• March 2 – Deadline to furnish forms to employees
• March 31 – Deadline to file with the IRS
• Filing deadline can be extended by 30 days
• Distribution deadline cannot be extended further

How Does ACA Affordability Work?

When Does Affordability Matter?

Affordability only becomes an issue if:

• An employee waives employer coverage, and
• Enrolls in subsidized exchange coverage

If an employee enrolls in employer coverage—even if expensive—no penalty is triggered.

Affordability Threshold

Coverage is considered affordable if the employee’s cost for self-only coverage does not exceed a set percentage of household income:

• 2025: 9.02%
• 2026: 9.96%

Safe Harbor Options

Because employers do not know household income, the IRS allows three alternatives:

1. Federal Poverty Line (FPL)

• Simplest method
• Guarantees affordability for all employees
• Typically requires higher employer contributions

2. Rate of Pay

• Based on hourly rate × 130 hours/month
• Predictable and stable for planning
• Not suitable for commission-based or tipped employees

3. W-2 Safe Harbor

• Based on Box 1 wages
• Calculated at year-end
• Requires consistent contribution structure

Employers can apply different methods to different employee groups, as long as they do so consistently.

Understanding Form 1095-C: Where Errors Happen Most

The most complex part of ACA reporting is completing:

• Line 14 – Offer of coverage
• Line 15 – Cost of coverage
• Line 16 – Safe harbor or coverage status

Common Pitfalls

• Missing or incorrect Line 16 codes
• Misinterpreting waivers vs. non-offers
• Failing to track eligibility month-by-month

These errors can incorrectly signal non-compliance to the IRS.

Common Reporting Scenarios Employers Face

Ongoing Full-Time Employee

• Offer made → Code on Line 14
• Cost reported → Line 15
• Enrollment → Code 2C on Line 16

If waived:

• Use affordability safe harbor codes (2F, 2G, or 2H)

New Hires

Key factors:

• Hire date
• Waiting period
• Measurement method

During waiting or eligibility periods:

• Use limited non-assessment period code (2D)

Variable Hour Employees

Under the look-back measurement method:

• Status is locked during a stability period
• Coverage decisions must reflect prior measurement results

Full-Time to Part-Time Transitions

This is one of the most misunderstood scenarios.

Key issue:

• Employees may still be considered full-time under ACA rules, even if their hours drop

Implication:

• Removing coverage too early can create penalty risk
• Employers may need to continue offering coverage through the stability period

Temporary Employees

If using the monthly measurement method:

• Employees averaging 130+ hours/month are considered full-time
• Failing to offer coverage can trigger penalties

Leaves of Absence (FMLA and Non-FMLA)

• Coverage often must continue during FMLA
• Post-FMLA handling depends on employer policy
• Coding must reflect:
  • Continued eligibility
  • COBRA transitions
  • Return-to-work timing

Termination of Employment

After termination:

• Always code:
  • Line 14: 1H
  • Line 16: 2A

Even if COBRA is elected, it does not change reporting after termination.

Why Form 1094-C Deserves Special Attention

The 95% Offer Requirement

Form 1094-C determines whether the employer:

• Offered coverage to at least 95% of full-time employees

If marked incorrectly:

• Employer may trigger Section 4980H(a) penalties

Why This Matters

• Penalty applies to all full-time employees (minus first 30)
• Only one employee receiving a subsidy can trigger it

Common Mistake

• Leaving months blank or incorrectly marked “No”
• Many systems default to incorrect values

Best practice: Always review Form 1094-C separately before filing.

Final Thoughts

ACA reporting is less about understanding the rules in isolation and more about applying them consistently across real employee scenarios. Most compliance issues arise not from lack of knowledge, but from breakdowns in tracking, coding, or system setup.

Employers who take time to validate their reporting—especially around employee status changes and Form 1094-C—are far better positioned to avoid penalties and rework.

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Disclaimer

This content is provided for general informational purposes only and is not intended as insurance advice. Coverage, terms, and availability can vary by carrier and state. For guidance specific to your situation, we recommend speaking with a licensed insurance professional.

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