The IRS just made ACA compliance more expensive. For 2026, the penalty for failing to offer coverage to your full-time employees jumped to $3,340 per person – a 15.2% increase from 2025 and the sharpest single-year spike in nearly a decade. For a staffing agency with 300 full-time workers on payroll, a compliance miss could cost over $900,000 in a single year.
Staffing firms face a compliance challenge that most other industries don’t. Your workforce is inherently variable – workers come and go, hours fluctuate week to week, and the line between “full-time” and “part-time” is rarely clean. That combination of scale and variability is exactly what makes ACA compliance so critical – and so difficult – for staffing companies.
This guide walks through every ACA compliance requirement that applies to staffing agencies in 2026: who qualifies as an Applicable Large Employer, how full-time status is determined, how to use look-back measurement periods, what the current penalty amounts are, and how to build a compliance process that holds up under IRS scrutiny.
Understanding the ACA Employer Mandate
Who Qualifies as an Applicable Large Employer (ALE)
The ACA’s employer mandate – officially the Employer Shared Responsibility Provision – applies to Applicable Large Employers, defined as companies with an average of 50 or more full-time employees (including full-time equivalents) during the prior calendar year.
The “prior calendar year” part matters. Your ALE status for 2026 is determined by your 2025 headcount, not your current workforce. So even if your agency shrinks below 50 employees today, you’re still subject to the mandate if you crossed that threshold last year.
The full-time equivalent calculation is where things get complicated for staffing firms. Part-time employees don’t each count as a full employee – instead, you add up all the hours worked by part-time employees in a month and divide by 120. That number gets added to your full-time count. An agency with 40 full-time placed workers and 20 part-timers averaging 60 hours each per month would add 10 FTEs (20 × 60 / 120) to their full-time count – putting them at 50 and squarely inside the mandate.
How the Mandate Applies to Staffing Firms
The employer mandate requires ALEs to do three things:
1. Offer Minimum Essential Coverage (MEC) to at least 95% of full-time employees and their dependent children up to age 26
2. Ensure that coverage is affordable – the employee-only premium can’t exceed 9.96% of household income in 2026 (up from 9.02% in 2025)
3. Ensure coverage provides Minimum Value – the plan must cover at least 60% of total allowed costs
Fail to meet any of these, and you’re exposed to penalties. Fail to offer coverage at all, and you face the larger “sledgehammer” penalty under Section 4980H(a). Offer coverage but get the affordability or minimum value piece wrong, and the “tack hammer” penalty under 4980H(b) applies instead.
But here’s the specific wrinkle for staffing: who is the employer of record? When a staffing agency places workers at client sites, the agency is generally treated as the employer for ACA purposes – which means the compliance obligation follows the agency, not the client. This is true even if the client controls day-to-day work activities.
Defining Full-Time Employees in Staffing
The 30-Hour Threshold
Under the ACA, a full-time employee is anyone who averages 30 or more hours of service per week, or 130 hours per month. The IRS defines “hours of service” broadly – it includes not just hours worked, but any hour for which an employee is paid or entitled to be paid, including paid leave, holiday pay, and jury duty.
That’s a broader definition than most staffing firms’ internal systems are built around. Timekeeping platforms that track only billable hours won’t capture everything the IRS counts.
Variable-Hour Employee Classifications
Most placed workers in staffing aren’t neatly full-time or part-time at hire. They’re variable-hour employees – workers whose schedules are unpredictable enough that you can’t reasonably determine at the start date whether they’ll average 30 hours per week.
The IRS explicitly recognizes variable-hour status as a classification category, and it comes with different rules than employees hired into defined full-time or part-time roles. For variable-hour workers, you can’t simply look at their first week or two and make a judgment call. The ACA gives you a formal mechanism – the look-back measurement method – to track actual hours over a defined period before making coverage decisions.
Variable-hour classification isn’t a way to avoid offering benefits. It’s a way to defer the determination until you have real data. Once a measurement period ends and a worker has averaged 30+ hours per month, coverage must be offered for the entire subsequent stability period – regardless of what happens to their hours after that point.
Look-Back Measurement Periods Explained
The look-back measurement method is the most practical tool staffing firms have for managing ACA compliance with a variable workforce. It lets you track actual hours over a defined period, determine eligibility based on real data, then lock in that status for a corresponding stability period.
Standard vs. Monthly Measurement Methods
The IRS allows two methods for determining full-time status:
Monthly measurement method: You count hours each calendar month. If an employee works 130+ hours that month, they’re full-time for that month. Simple, but problematic for staffing – it can trigger mid-month coverage obligations and creates enormous administrative complexity when hours fluctuate.
Look-back measurement method: You designate a measurement period (3 to 12 months), track hours across that period, determine average monthly hours, then apply the resulting status for a defined stability period. This is what virtually all staffing firms use because it creates predictability.
Setting Up Measurement, Administrative, and Stability Periods
A look-back system has three interconnected periods:
Measurement Period: The window during which you track actual hours. Can be 3 to 12 months. Most staffing firms use 12 months because it smooths out seasonal variation and short-term assignment fluctuations. You need a separate measurement period for new hires (the Initial Measurement Period) and for ongoing employees (the Standard Measurement Period).
Administrative Period: The gap between the end of a measurement period and the start of a stability period. Gives you time to calculate eligibility, set up enrollment, and communicate with employees. The IRS allows up to 90 days. Don’t skip this – trying to process eligibility on the last day of the measurement period is a recipe for enrollment errors.
Stability Period: The period during which an employee’s full-time or non-full-time status is locked in based on what the measurement period showed. If an employee averaged 130+ hours per month during measurement, they must be offered coverage for the entire stability period – even if their hours drop. The stability period must be at least 6 months and generally must be the same length as the measurement period (or longer).
Initial vs. Standard Measurement Periods
New hires get their own measurement period, separate from the ongoing measurement cycle for tenured employees. The Initial Measurement Period starts on or near the hire date and can run 3 to 12 months. After the initial period and the corresponding stability period, the employee rolls into the standard measurement cycle with the rest of the workforce.
This distinction matters practically. If you’re hiring 50 workers in March, 40 in June, and 30 in September – typical for a staffing agency – each cohort is on its own initial measurement timeline. Your compliance system needs to track all of them simultaneously without letting any fall through the cracks.
ACA Penalties: What’s at Stake in 2026
The 2026 penalty increases announced by the IRS in July 2025 represent the largest year-over-year jump since the employer mandate began. If your firm wasn’t paying close attention to ACA compliance before, the new numbers are a good reason to start.
4980H(a) Penalties: The Coverage-Gap Penalty
The 4980H(a) penalty applies when an ALE fails to offer Minimum Essential Coverage to at least 95% of its full-time employees (and their dependents), and at least one full-time employee receives a subsidized premium tax credit through the ACA marketplace.
2026 amount: $3,340 per full-time employee annually, minus the first 30 employees.
So for an agency with 200 full-time employees that fails to offer coverage at all, the calculation is: (200 – 30) × $3,340 = $567,800 per year.
This penalty is triggered on a monthly basis – one-twelfth of $3,340 for each month of non-compliance. Miss coverage for just three months? You’re looking at roughly $141,950 for a 200-person agency.
According to the IRS employer shared responsibility provisions page, the penalty amounts have increased every year since enforcement began, rising from $2,000 when the mandate was first established.
4980H(b) Penalties: The Affordability and Minimum Value Penalty
The 4980H(b) penalty is narrower but can still add up fast. It applies when an employer offers coverage – satisfying the 95% offer requirement – but that coverage either isn’t affordable or doesn’t provide minimum value, and an employee ends up receiving marketplace subsidies as a result.
2026 amount: $5,010 per affected full-time employee annually.
The higher per-employee amount reflects the IRS’s view that an employer who knowingly offers inadequate coverage is more culpable than one who simply fails to offer anything. And the 4980H(b) penalty applies only to employees who actually received subsidies – so the universe of affected employees is smaller than under (a). But the per-person exposure is larger.
One important limit: the total 4980H(b) penalty for a given employer can’t exceed what the 4980H(a) penalty would have been if the employer had offered nothing at all.
Choosing the Right ACA-Compliant Plan
Getting plan selection right is how staffing firms avoid both penalty types. There’s a meaningful difference between what’s required under each penalty provision, and matching your plan design to your workforce composition can significantly reduce your cost and exposure.
MEC Plans for Preventive Coverage
A Minimum Essential Coverage plan satisfies the offer requirement under 4980H(a). MEC plans cover ACA-mandated preventive services – annual wellness visits, screenings, immunizations – at no cost to employees. They don’t cover hospital stays, specialist visits, or most prescription drugs.
Offering MEC to 95% of your full-time workforce eliminates the risk of the larger (a) penalty. But it doesn’t protect you from the (b) penalty if employees find the coverage inadequate and seek marketplace subsidies.
For staffing agencies with a large population of short-tenure workers who primarily need compliance coverage rather than comprehensive benefits, MEC plans are often the right first layer. They’re more affordable to administer than full plans, and they create a documented offer of coverage for every eligible employee.
MVP Plans for Full Compliance
A Minimum Value Plan provides the actuarial coverage depth needed to avoid both ACA penalties. MVP plans must cover at least 60% of total allowed costs and include substantial coverage for inpatient and physician services.
Offering an affordable MVP plan – one where the employee-only premium doesn’t exceed 9.96% of household income in 2026 – eliminates exposure to both the (a) and (b) penalties.
BIC’s MVP plan structure is designed specifically for staffing firms, aggregating coverage weekly to match the way workers’ earnings and hours actually flow. This weekly aggregation approach makes MVP coverage more financially practical for workers with variable paychecks, without requiring the employer to redesign payroll processes.
ACA Compliance Checklist for Staffing Firms
Annual Compliance Calendar
October–December (prior year)
• Confirm your ALE status for the coming year by calculating prior-year headcount
• Finalize plan offerings for the coming plan year
• Set or review measurement periods, administrative periods, and stability periods for all employee categories
• Ensure timekeeping systems capture all ACA-countable hours of service
January–March
• Communicate plan options to employees entering stability periods as full-time
• Begin enrollment processing for newly eligible workers
• Review affordability – confirm employee premium contributions don’t exceed 9.96% of income (2026 threshold)
Throughout the year
• Track initial measurement periods for all new hires
• Monitor breaks in service (13+ consecutive weeks may allow a new initial period; shorter breaks require continuity)
• Document offer of coverage for every eligible employee, every month
October–November
• Begin ACA reporting data collection for the calendar year
• Audit 1095-C coding for accuracy – incorrect offer codes are the most common reporting error for staffing firms
• Verify dependent coverage tracking (children up to age 26)
January–March (following year)
• Furnish Forms 1095-C to employees by January 31
• File Forms 1094-C and 1095-C with the IRS by March 31 (electronic) or February 28 (paper)
Common Mistakes to Avoid
Misclassifying variable-hour workers as part-time at hire. The IRS doesn’t require you to predict whether someone will be full-time – that’s what the measurement period is for. But you can’t retroactively reclassify someone who should have been tracked as variable-hour.
Letting measurement periods lapse without action. When a measurement period ends and an employee has crossed the 130-hour threshold, you have until the end of the administrative period to make an offer. Missing that window means you’ve exposed yourself to a monthly penalty.
Getting the 95% calculation wrong. It’s 95% of full-time employees, not 95% of all employees. Part-time employees and employees still in their initial measurement periods don’t count in the denominator for this calculation.
Ignoring gap-in-service rules for rehires. A worker who left after three months and comes back four months later isn’t automatically a new hire. The break-in-service rules are specific – 13 consecutive weeks (or 26 for educational institutions) triggers the new-hire treatment. Anything shorter requires you to pick up where the previous measurement period left off.
Filing incomplete or incorrectly coded 1095-Cs. The IRS cross-references 1095-C filings with employee tax returns. Incorrect offer codes, missing months, or wrong safe harbor elections are the top triggers for Letter 226-J penalty notices.
Staffing firms that have managed compliance well generally have two things in common: a dedicated compliance owner who tracks measurement periods consistently, and benefits infrastructure designed for a variable-hour workforce. That second piece – plan design that actually works for the way your workers are employed – is where partners like Benefits in a Card can make a real operational difference. Their day-one eligibility model and Benefits Wizard tool give staffing firms precise control over coverage periods without the administrative overhead of managing traditional enrollment cycles.
What to Do If You Receive IRS Letter 226-J
Letter 226-J is the IRS’s initial notice that you may owe an Employer Shared Responsibility Payment. It includes an ESRP Summary Table showing proposed penalties broken down by month, along with Form 14764 (your response form) and Form 14765 (the list of employees who triggered the penalty).
Don’t panic, and don’t ignore it. As of January 2025 – following passage of the Employer Reporting Improvement Act – employers now have at least 90 days to respond, up from the previous 30-day window. That’s time to review the underlying data, check it against your own records, and build a response.
Many 226-J assessments are reduced or eliminated through the response process. The IRS’s proposed penalty is based on information returns you and your employees filed – and mismatches between your 1095-C data and employee tax returns are common. If an employee received a marketplace subsidy but you did offer them compliant coverage, a well-documented response can eliminate the penalty entirely.
If you agree with the assessment, you respond with Form 14764, check the agreement box, and follow the IRS’s payment instructions. If you disagree, you respond with a full explanation and any supporting documentation.
After you respond, the IRS will send one of several Letter 227 variants: 227-K (penalty zeroed out), 227-L (reduced but not eliminated), or 227-M (unchanged, with appeals available).
ACA compliance for staffing agencies isn’t a one-time project – it’s a continuous process that runs parallel to your hiring and placement operations. The firms that get it right aren’t necessarily the ones with the largest compliance teams; they’re the ones with clear processes, the right plan structure in place, and benefits infrastructure built for variable-hour workforces from the ground up.
References
1. Internal Revenue Service, “Employer Shared Responsibility Provisions,” IRS.gov, updated November 2025. https://www.irs.gov/affordable-care-act/employers/employer-shared-responsibility-provisions
2. 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/
3. National Insurance Services, “IRS Releases ACA Pay-or-Play Penalties for 2026,” NIS Benefits, 2025. https://blog.nisbenefits.com/hubfs/blog-supporting-docs/bulletin-pay-play-penalties-2026.pdf
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. Ameriflex, “Biggest ACA Penalty Jump in a Decade,” August 4, 2025. https://myameriflex.com/resources/articles/biggest-aca-penalty-jump-in-a-decade/
6. Internal Revenue Service, “Understanding Your Letter 226-J,” IRS.gov, December 16, 2025. https://www.irs.gov/individuals/understanding-your-letter-226-j
7. ADP SPARK, “ACA Lookback Measurement Method: Determining Full-Time Employees,” December 2022. https://www.adp.com/spark/articles/2022/12/aca-lookback-measurement-method-determining-full-time-employees.aspx
8. Frier Levitt, “Reminder: Affordable Care Act Reporting Compliance Eased for 2026,” January 7, 2026. https://www.frierlevitt.com/articles/aca-reporting-compliance-relief-2026/
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/
