A staffing agency with 500 full-time placed workers that fails to offer health coverage faces a potential ACA penalty of over $2.3 million. Not a worst-case hypothetical – that’s the math at 2026 rates.
The IRS announced in July 2025 that ACA employer mandate penalties would increase by 15.2% for the 2026 calendar year – the largest single-year increase since enforcement began. For staffing companies already managing razor-thin margins, that kind of exposure isn’t something you can table for later. Understanding exactly how these penalties work, what triggers them, and what the dollar amounts look like for firms of different sizes is the first step toward making sure you never get that letter from the IRS.
Understanding ACA Penalty Types
The ACA’s employer mandate creates two distinct penalty categories, each targeting a different compliance failure. They’re calculated differently, triggered by different circumstances, and carry different per-employee costs.
4980H(a): The “Sledgehammer” Penalty
Section 4980H(a) of the Internal Revenue Code applies when an Applicable Large Employer fails to offer Minimum Essential Coverage to at least 95% of its full-time employees and their dependents – and at least one of those employees turns to the ACA marketplace and receives a subsidized premium tax credit.
The key phrase here is “fails to offer.” This is an employer who didn’t do the first thing – didn’t extend coverage to most of their workforce. The penalty applies across nearly the entire workforce, not just the employees who actually got subsidies.
The calculation: Annual penalty = (Number of full-time employees − 30) × $3,340
The 30-employee reduction is applied because the first 30 employees are exempt from the penalty count. The intent was to protect small employers near the 50-employee threshold from catastrophic penalties. In practice, for most staffing agencies well above 50 employees, that reduction is a small buffer.
4980H(b): The “Tack Hammer” Penalty
Section 4980H(b) applies to employers who did offer coverage – they cleared the 95% hurdle – but that coverage was either unaffordable (employee-only premium exceeding 9.96% of the employee’s household income in 2026) or failed to meet Minimum Value standards (covering less than 60% of total allowed costs).
The (b) penalty only applies to specific employees who received marketplace subsidies. Not to the whole workforce.
The calculation: Annual penalty = (Number of full-time employees who received premium tax credits) × $5,010
It sounds smaller than the (a) penalty – and for most employers it is, because the denominator is a subset of the workforce. But $5,010 per employee is a higher per-person rate than the (a) penalty’s $3,340. And there’s a cap: the total 4980H(b) penalty can’t exceed what the (a) penalty would have been if the employer had offered nothing at all.
2026 Penalty Amounts and Adjustments
Current Dollar Thresholds
The 2026 penalty amounts, announced by the IRS in Revenue Procedure 2025-21:
| Penalty | 2025 Amount | 2026 Amount | Increase |
| 4980H(a) – No coverage offered | $2,900/year per FT employee | $3,340/year per FT employee | +$440 (+15.2%) |
| 4980H(b) – Unaffordable/no min. value | $4,350/year per FT employee receiving subsidy | $5,010/year per FT employee receiving subsidy | +$660 (+15.2%) |
Monthly equivalent rates:
• 4980H(a): approximately $278.33 per full-time employee per month (minus the first 30)
• 4980H(b): approximately $417.50 per qualifying employee per month
Per Thomson Reuters Tax & Accounting, these are the rates for failures occurring in the 2026 calendar year, announced July 22, 2025.
Year-over-Year Increases
The trajectory of penalties since enforcement began shows why staying current matters:
| Year | 4980H(a) | 4980H(b) |
| 2015 | $2,080 | $3,120 |
| 2018 | $2,320 | $3,480 |
| 2021 | $2,700 | $4,060 |
| 2023 | $2,880 | $4,320 |
| 2024 | $2,970 | $4,460 |
| 2025 | $2,900 | $4,350 |
| 2026 | $3,340 | $5,010 |
The 2026 jump – driven by the IRS recalibrating its baseline assumptions about employer health premium costs – is a sharp acceleration compared to prior years. According to Ameriflex, the 2026 increase is the largest in nearly a decade.
Real-Dollar Penalty Scenarios for Staffing Firms
Abstract penalty rates are useful. What they cost a firm your size is more useful.
Scenario 1: 200-Employee Staffing Agency
Background: A regional staffing agency places 200 full-time workers in light industrial and warehouse positions. Due to administrative confusion during a software transition, the firm fails to make compliant offers to workers who cleared their measurement periods in Q1 and Q2 – approximately 160 workers go uncovered for 6 months.
4980H(a) penalty calculation (if no coverage was offered to 95%+ of those 160 workers):
• Applicable employees: 160 (those without compliant offers during the 6-month period)
• But the (a) penalty applies based on total full-time headcount minus 30: (200 − 30) = 170
• Monthly rate: $278.33 per employee
• Duration: 6 months
• Total exposure: 170 × $278.33 × 6 = $283,897
4980H(b) alternative (if coverage was offered but found unaffordable):
• Suppose 40 of those 200 workers enrolled in marketplace plans and received premium tax credits
• Penalty: 40 × $5,010 = $200,400
Even the “smaller” penalty is material. And these scenarios assume the problem is contained to one year. If the underlying compliance issue isn’t fixed, the exposure resets annually.
Scenario 2: 500-Employee Staffing Agency
Background: A larger regional staffing firm with 500 full-time placed workers decides not to offer any health coverage, betting that the IRS won’t get around to issuing a penalty notice for several years (a strategy some employers have tried, based on the IRS’s historical enforcement lag).
4980H(a) penalty calculation:
• (500 − 30) = 470 employees in the penalty calculation
• Annual penalty: 470 × $3,340 = $1,569,800
• If the IRS assesses penalties for two compliance years (2026 and 2027): $3,139,600
The “wait and see” strategy has a compounding problem: the IRS is currently working through assessments from 2022 and 2023. By the time a Letter 226-J arrives for 2026 failures, the statute of limitations has been extended to six years from the filing date (per the Employer Reporting Improvement Act). That’s a long window of exposure.
And consider: the IRS proposed over $15 billion in employer mandate penalties for tax year 2018 alone, according to a LinkedIn analysis of IRS enforcement data. Enforcement isn’t theoretical.
What Triggers an IRS Penalty Assessment
The IRS Letter 226-J Process
The IRS doesn’t audit employers in real time. Instead, it cross-references two data sets: the 1094-C/1095-C forms employers file, and the individual tax returns employees file when claiming premium tax credits.
When those two data sets don’t line up – an employee claims a marketplace subsidy, but the employer’s 1095-C shows that a compliant offer was made – the IRS investigates. When they do line up – an employee claims a subsidy, and the employer’s 1095-C shows no offer was made – a penalty notice goes out.
That notice is Letter 226-J. It arrives roughly two years after the tax year in question (the IRS is currently processing 2022 and 2023 violations). The letter includes:
• An ESRP Summary Table showing proposed penalties by month
• Form 14764 (your response form)
• Form 14765 (the specific employees who triggered the assessment)
As of January 2025, following passage of the Employer Reporting Improvement Act, employers have at least 90 days to respond – up from the previous 30-day window, which was a serious problem for agencies with complex workforces that took time to investigate.
Common Triggers for Staffing Firms
Based on the mechanics of how Letter 226-J is generated, staffing companies are most likely to be assessed penalties for:
Failure to track measurement periods accurately. If a variable-hour employee crossed the 130-hour-per-month threshold during their measurement period but your system didn’t flag it, no offer was made, and the employee ended up on the marketplace. This is the most common staffing-specific trigger.
Incorrect 1095-C coding. Using the wrong Line 14 offer code – for instance, coding a month as “no offer” when coverage was available but declined – creates a phantom penalty exposure. The IRS reads the code, not what actually happened.
Offering coverage below minimum value. Some staffing firms have tried to satisfy the mandate with “skinny” plans that technically qualify as MEC but don’t meet minimum value. Those employees can still receive marketplace subsidies, and the 4980H(b) penalty still applies.
Not meeting the 95% offer threshold. If 91% of your full-time workforce has a compliant offer but 9% don’t, you’ve failed the offer requirement – and the (a) penalty applies based on your entire workforce count, not just the 9% without coverage.
Mishandling rehires and breaks in service. A worker who returns after a 10-week break isn’t necessarily a new hire for ACA purposes. Treating them as one – and restarting an initial measurement period – could mean a gap in coverage during the break period that results in a 4980H violation.
How to Avoid ACA Penalties
Choosing the Right Plan Structure
The foundation of penalty avoidance is straightforward: offer a qualifying plan to 95%+ of your full-time workforce, make sure the plan meets minimum value, and price it so the employee contribution doesn’t exceed 9.96% of household income (2026 threshold).
For staffing firms, the practical challenge is the variable-hour workforce. You can’t offer coverage to employees you haven’t yet determined are full-time. The look-back measurement method lets you defer that determination – but once someone crosses the eligibility threshold, the offer has to happen promptly within the administrative period.
Day-one eligibility plans – like those offered by Benefits in a Card – give you the option to cover workers from the start of an assignment rather than waiting through a measurement period. That approach trades administrative simplicity for the measurement period mechanics, and it eliminates the gap risk that comes from trying to track exact hours across variable assignments.
Tracking and Reporting Best Practices
Penalty avoidance is a documentation exercise as much as a plan design one. The IRS’s penalty assessment process starts with what you filed. If your 1095-C forms accurately reflect what you offered, to whom, and for which months – you have a defensible record. If they don’t, you’re starting a fight with one hand tied.
Specific practices that reduce penalty exposure:
• Run ACA eligibility reports monthly, not annually – catching errors in January is better than catching them in October when you’re preparing to file
• Audit your Line 14 and Line 16 codes before filing – code 1H (“no offer”) should never appear for a month when an eligible employee was in a stability period
• Track employee breaks in service systematically, with clear rules for when the 13-week new-hire clock applies
• Document every offer of coverage – the date, the plan offered, and how the offer was communicated
• Reconcile your coverage data against payroll quarterly to catch any employees who should be in a measurement period but aren’t being tracked
The IRS’s enforcement lag means the consequences of 2026 errors may not arrive until 2028. Don’t confuse that delay with safety – the statute of limitations extends six years, and penalties run from the time of the violation.
FAQ
What are ACA employer mandate penalties?
ACA employer mandate penalties are fines imposed by the IRS on Applicable Large Employers (ALEs) that fail to offer compliant health coverage to full-time employees. These penalties are part of the Employer Shared Responsibility Provisions under the Affordable Care Act.
What is the difference between 4980H(a) and 4980H(b) penalties?
The ACA defines two types of penalties:
- 4980H(a) (“Sledgehammer”): Applies when an employer fails to offer coverage to at least 95% of full-time employees. It affects nearly the entire workforce.
- 4980H(b) (“Tack Hammer”): Applies when coverage is offered but is unaffordable or does not meet minimum value. It only applies to employees who receive marketplace subsidies.
What are the ACA penalty amounts for 2026?
For the 2026 calendar year:
- 4980H(a): $3,340 per full-time employee (minus the first 30 employees)
- 4980H(b): $5,010 per employee receiving a premium tax credit
These represent a 15.2% increase, the largest in nearly a decade.
How is the 4980H(a) penalty calculated?
The formula for the 4980H(a) penalty is:
(Total full-time employees − 30) × $3,340 per year
This penalty applies if the employer fails to offer coverage to at least 95% of full-time employees.
How is the 4980H(b) penalty calculated?
The 4980H(b) penalty is calculated as:
Number of employees receiving premium tax credits × $5,010 per year
This only applies to employees who receive subsidies due to unaffordable or inadequate coverage.
What triggers an ACA penalty from the IRS?
Penalties are typically triggered when:
- An employee receives a marketplace subsidy
- The employer’s 1095-C shows no compliant coverage offer
- IRS data from employer filings and employee tax returns don’t align
This results in an IRS Letter 226-J being issued.
How long does it take for the IRS to issue a penalty notice?
The IRS usually issues penalty notices about two years after the violation. However, the statute of limitations has been extended to six years, increasing long-term exposure.
Why are staffing companies at higher risk for ACA penalties?
Staffing firms face unique challenges such as:
- Variable-hour employees
- Complex measurement periods
- Frequent rehires and breaks in service
- High administrative complexity
These factors increase the likelihood of compliance errors.
What are the most common ACA compliance mistakes?
Common issues include:
- Failing to track eligibility correctly
- Incorrect 1095-C coding
- Offering plans that don’t meet minimum value
- Missing the 95% coverage threshold
- Mishandling rehires or breaks in service
How can employers avoid ACA penalties?
To reduce risk:
- Offer compliant coverage to at least 95% of full-time employees
- Ensure affordability (≤ 9.96% of income in 2026)
- Use accurate tracking for hours and eligibility
- Audit 1095-C forms before filing
- Document all coverage offers
Strong reporting and documentation are critical for defending against penalties.
Can ACA penalties be significant for staffing firms?
Yes. For example, a staffing firm with 500 employees could face over $1.5 million annually in penalties under 4980H(a), and even more if violations persist across multiple years.
References
1. Thomson Reuters, “IRS Announces Increases for 2026 ACA Employer Shared Responsibility Penalties,” Tax & Accounting News, July 23, 2025. https://tax.thomsonreuters.com/news/irs-announces-increases-for-2026-aca-employer-shared-responsibility-penalties/
2. NIS Benefits, “IRS Releases ACA Pay-or-Play Penalties for 2026.” https://blog.nisbenefits.com/hubfs/blog-supporting-docs/bulletin-pay-play-penalties-2026.pdf
3. Ameriflex, “Biggest ACA Penalty Jump in a Decade,” August 4, 2025. https://myameriflex.com/resources/articles/biggest-aca-penalty-jump-in-a-decade/
4. The Horton Group, “ACA Pay-or-Play 2026: Employer Affordability & Penalties,” October 6, 2025. https://www.thehortongroup.com/resources/aca-pay-or-play-2026-employers/
5. Internal Revenue Service, “Employer Shared Responsibility Provisions,” updated November 2025. https://www.irs.gov/affordable-care-act/employers/employer-shared-responsibility-provisions
6. Internal Revenue Service, “Understanding Your Letter 226-J,” December 16, 2025. https://www.irs.gov/individuals/understanding-your-letter-226-j
7. Frier Levitt, “ACA Reporting Compliance Eased for 2026,” January 7, 2026. https://www.frierlevitt.com/articles/aca-reporting-compliance-relief-2026/
8. LinkedIn / Author, “Employer’s Guide: What to Do When You Get an ACA Penalty Notice from the IRS,” February 25, 2026. https://www.linkedin.com/pulse/employers-guide-what-do-when-you-get-aca-penalty-notice-from-irs-hbsdc
9. Small Business Association of Michigan, “ACA Affordability & Employer Mandate Updates for 2026 Plan Year,” March 10, 2026. https://www.sbam.org/aca-affordability-employer-mandate-updates-for-2026-plan-year/
