- Why ACA Penalties Are Usually Bigger Than Employers Expect
- The Four ACA Penalty Buckets
- How the 4980H(a) Penalty Is Calculated
- How the 4980H(b) Penalty Is Calculated
- How IRC 6721 and 6722 Reporting Penalties Stack
- Why State ACA Penalties Can Add Another Layer
- Example Penalty Scenarios
- What to Do First If Your Exposure Looks Large
- Key Takeaways
Why ACA Penalties Are Usually Bigger Than Employers Expect
When an employer first learns they may have ACA exposure, the instinct is to think of it as one problem with one number attached. The IRS does not think that way. ACA penalty exposure is calculated across multiple separate systems — each measuring a different kind of failure, each producing its own penalty calculation, and each capable of running simultaneously with the others.
An employer that failed to offer compliant coverage, filed incorrect Forms 1095-C, and never filed state mandate reports is not facing one penalty. It is facing at minimum three separate penalty calculations under three separate statutory authorities — each compounding independently before the totals are added together.
This is why employers are frequently blindsided by the size of proposed ESRP assessments on Letter 226-J. Information return penalties under IRC 6721 and 6722 are calculated separately — and in states with their own individual mandate reporting requirements, a third layer of exposure may exist entirely outside the federal system.
The Four ACA Penalty Buckets
| Penalty Bucket | Statutory Authority | What It Measures | Who It Hits |
|---|---|---|---|
| Employer Mandate — Offer Failure | IRC § 4980H(a) | Whether MEC was offered to at least 95% of full-time employees | Entire full-time workforce once triggered |
| Employer Mandate — Affordability Failure | IRC § 4980H(b) | Whether specific employees' offers were affordable and minimum value | Individual employees who received a PTC |
| Information Return Penalties | IRC § 6721 / 6722 | Whether 1094-C/1095-C forms were filed correctly and furnished to employees | Per form, per failure |
| State Mandate Reporting Penalties | State law | Whether state ACA reporting was separately filed where required | Varies by state |
How the 4980H(a) "Sledgehammer" Penalty Is Calculated
Formula: Monthly 4980H(a) exposure = (Full-time employees for the month − 30) × monthly 4980H(a) amount
| Tax Year | 4980H(a) Annual | 4980H(a) Monthly | Source |
|---|---|---|---|
| 2024 | $2,970 | $247.50 | Rev. Proc. 2023-29 |
| 2025 | $2,900 | $241.67 | Rev. Proc. 2024-14 |
| 2026 | $3,340 | $278.33 | Rev. Proc. 2025-26 |
Note: The controlling authority for 2025 is Rev. Proc. 2024-14, which sets the amount at $2,900. Some practitioner summaries show $2,970 (the 2024 figure carried forward). Always verify against the controlling Revenue Procedure for the applicable tax year.
Scenario: An employer with 150 full-time employees fails the 95% offer threshold for the entire 2026 calendar year. Monthly exposure: (150 − 30) × $278.33 = $33,400. Annual exposure: $33,400 × 12 = $400,800.
How the 4980H(b) "Tack Hammer" Penalty Is Calculated
Formula: Monthly 4980H(b) exposure = Number of assessable full-time employees with a PTC for the month × monthly 4980H(b) amount. The 4980H(b) liability for any month cannot exceed what the 4980H(a) liability would have been for that same month.
| Tax Year | 4980H(b) Annual | 4980H(b) Monthly | Source |
|---|---|---|---|
| 2024 | $4,460 | $371.67 | Rev. Proc. 2023-29 |
| 2025 | $4,350 | $362.50 | Rev. Proc. 2024-14 |
| 2026 | $5,010 | $417.50 | Rev. Proc. 2025-26 |
Scenario: An employer offers coverage to all full-time employees but 10 receive premium tax credits for all 12 months of 2026 because the coverage was unaffordable. Annual 4980H(b) exposure: 10 × 12 × $417.50 = $50,100. As detailed in our ACA Affordability Safe Harbors article, affordability failures are often the result of small math errors.
How IRC 6721 and 6722 Reporting Penalties Stack
IRC 6721 applies to failures to file correct information returns with the IRS — including missing, late, or incorrect Forms 1094-C and 1095-C. IRC 6722 applies to failures to furnish correct payee statements to employees. The same missing or incorrect Form 1095-C triggers both penalties — one for the failure to file with the IRS and one for the failure to furnish to the employee.
For 2026, the maximum standard penalty under each statute is $340 per form for uncorrected or severely late returns — producing combined exposure of up to $680 per form when both apply simultaneously.
Scenario: Missing 1095-Cs for 500 employees. IRC 6721 exposure (maximum): 500 × $340 = $170,000. IRC 6722 exposure (maximum): 500 × $340 = $170,000. Combined maximum: $340,000 — in addition to any ESRP under 4980H.
Why State ACA Penalties Can Add Another Layer
Several states have enacted their own individual health insurance mandates: California, New Jersey, Massachusetts, Rhode Island, and the District of Columbia. Each operates independently of the federal AIRS system. Filing Forms 1094-C and 1095-C with the IRS does not satisfy state reporting obligations in any of these jurisdictions.
Our State ACA Reporting article covers the state-by-state reporting landscape in detail.
Example Multi-Year Scenario
An employer with 200 full-time employees misclassified 40 variable-hour employees as part-time for three years, never offering them coverage and never filing 1095-Cs for them.
Federal ESRP exposure: Even a 4980H(b)-only calculation for 10 affected employees across three years: 10 × $5,010 × 3 years = $150,300.
Reporting penalty exposure: Missing 1095-Cs for 40 employees across three years — 120 forms — at the maximum combined rate of $680 per form: $81,600.
Total potential exposure: Well over $230,000 from what started as a variable-hour classification decision.
What to Do First If Your Exposure Looks Large
Step 1 — Triage the Risk Category. Identify which penalty buckets are in play before calculating any number.
Step 2 — Lock Down the Core Data. Pull source records: employee rosters with full-time status by month, hours of service and measurement method documentation, offer-of-coverage records, affordability calculations, Forms 1094-C and 1095-C as filed, AIRS acknowledgements.
Step 3 — Reconcile Eligibility, Offers, and Filings. Compare who was actually full-time under ACA measurement methodology, who was offered coverage, what was reported, and what the IRS likely sees.
Step 4 — Correct, Document, and Move Fast. File missing or corrected forms where appropriate and fix the process prospectively.
Not sure which ACA penalty systems apply to your situation?
PenaltyShield helps employers map ACA risk across ESRP, reporting penalties, and state filing exposure — then build a defensible plan to reduce or contain the problem before penalties compound further.
Key Takeaways
- ACA penalties are not one penalty. They are a stack of separate penalty systems — 4980H(a), 4980H(b), IRC 6721, IRC 6722, and state-level reporting penalties — each measuring a different failure and each capable of running simultaneously.
- 4980H(a) is monthly and workforce-wide once triggered. A single month of apparent 95% offer failure applies to the entire full-time workforce minus 30 employees.
- 4980H(b) is per-employee-month but multiplies quickly. Ten employees receiving PTCs for all 12 months of 2026 produces $50,100 in exposure.
- IRC 6721 and 6722 maximum standard penalties are up to $340 per form per statute — up to $680 combined per form for uncorrected returns.
- State ACA reporting penalties may add a third layer of exposure in California, New Jersey, Massachusetts, Rhode Island, and the District of Columbia.
- ACA exposure grows fastest when the same mistake repeats across months, forms, and years.
- The 2025 4980H(a) amount per Rev. Proc. 2024-14 is $2,900 annually. Always verify against the controlling IRS Revenue Procedure for the applicable tax year.
If your ACA exposure looks larger than expected, the worst move is guessing.
PenaltyShield helps employers map ACA risk across ESRP, reporting penalties, and state filing exposure, then build a defensible plan to reduce or contain the problem before penalties compound further.