ACA Reporting: A Plain-English Guide for Small Business Owners

Nobody goes into business because they love filing health coverage forms with the IRS. And yet, here we are. If a company had 50 or more full-time equivalent employees last year, ACA reporting is part of the deal, and getting it wrong comes with real penalties that can add up fast.

The good news is that ACA reporting is not as complicated as it sounds once you understand what it requires. Here is what small employers need to know.

What ACA Reporting Even Is

The Affordable Care Act requires applicable large employers (ALEs) to report health coverage information to the IRS each year. The idea is that the government can verify whether people had access to qualifying coverage and whether individuals owe any tax penalties.

If a business had 50 or more full-time equivalent employees in the prior calendar year, it qualifies as an ALE. That threshold includes full-time employees plus part-timers counted proportionally, so a workforce of mostly part-time staff can push a company over the line even without 50 people working 40-hour weeks.

The Two Forms That Matter

ACA reporting centers on two forms: 1094-C and 1095-C.

• The 1095-C goes to each full-time employee. It tells them and the IRS what coverage was offered, what it would cost them, and whether they were enrolled. The deadline to furnish employee copies is March 2, 2026.
• The 1094-C is the transmittal form. Think of it as the cover sheet that accompanies all the 1095-Cs when filing with the IRS. It summarizes overall coverage offerings and certifies the employer is meeting its obligations under the employer mandate. Electronic filers must submit to the IRS by March 31, 2026. Paper filing is only permitted for employers submitting fewer than 10 returns.

A New Option for Employee Distribution

Starting with 2025 coverage reporting, employers no longer must automatically mail a 1095-C to every employee. There is now an alternative: post a clear, prominent notice on the company website by March 2, 2026, informing employees they can request a copy. That notice must stay up through October 15, 2026, and any employee who requests a form must receive it within 30 days.

This can meaningfully reduce the administrative burden for larger teams. Employers who want to keep mailing forms directly can still do that. Both paths are compliant.

What the Employer Mandate Actually Requires

As an ALE, coverage must be offered to at least 95% of full-time employees and their dependents. That coverage also must meet minimum value standards and be considered affordable based on the employee’s household income or a safe harbor calculation. For the 2025 plan year, the affordability threshold is 9.02%.

If those requirements are not met and at least one employee gets a subsidized plan through the marketplace, employer shared responsibility payments can follow. Failing to offer minimum essential coverage at all can trigger a penalty of $3,340 per full-time employee. Offering coverage that is deemed unaffordable or lacking minimum value carries a separate penalty of $5,010 per affected employee who received a marketplace tax credit.

Common Mistakes That Trigger Problems

Missing or incorrect Social Security numbers top the list. The IRS matches filings against individual tax returns, and mismatches create correction headaches. Capturing accurate SSNs during onboarding and verifying them annually removes a lot of that risk.

Getting employee classification wrong is another common issue. Full-time status under the ACA is 30 or more hours per week, not 40. That threshold catches employers off guard more often than it should.

Late filing is also a recurring problem. Missing the March 31 electronic filing deadline costs money per return and the penalties scale up the longer the delay runs. If a corrected form is filed within 30 days of the due date, the per-return penalty is $60. Filed by August 1, it goes up to $130. After that, $340 per form. Willful disregard carries no maximum cap.

Self-Insured Plans Add a Layer

Employers offering a self-insured health plan rather than going through a carrier have additional reporting requirements. The 1095-C must also identify which employees and dependents were enrolled in coverage, not just offered it. This requires more detailed tracking throughout the year, not just at filing time.

When It Makes Sense to Get Help

Managing ACA reporting manually with spreadsheets means doing a lot of work that software can handle more accurately. Tracking eligibility, generating forms, distributing to employees, and filing with the IRS can all run through a payroll and HR platform built for compliance.

That is especially true for businesses with fluctuating workforces, employees in multiple states, or those hovering close to that 50-employee threshold who need to monitor ALE status carefully.