Under the Affordable Care Act, small business requirements turn on one number: whether you averaged 50 or more full-time equivalent employees in the prior calendar year. Below that line, you have no federal obligation to offer health insurance. At or above it, you must offer qualifying coverage to full-time employees or face IRS penalties. Small employers who choose to offer coverage voluntarily can tap a tax credit worth up to 50% of premiums, buy through the SHOP marketplace, or reimburse employees for individual coverage through a QSEHRA or ICHRA.
How the ACA Counts Your Employees
The threshold that determines your obligations is the “applicable large employer” test in the tax code. It applies to any employer that averaged at least 50 full-time employees during the prior calendar year.1Office of the Law Revision Counsel. 26 USC 4980H – Shared Responsibility for Employers Regarding Health Coverage Below 50, you’re a small employer for ACA purposes and the employer mandate doesn’t apply.
A full-time employee is anyone averaging at least 30 hours of service per week or 130 hours per month.2Internal Revenue Service. Identifying Full-Time Employees Part-time workers also count, but through a conversion. Add up the total monthly hours worked by all employees who are not full-time, then divide by 120. The result is the number of full-time equivalents your part-time workforce generates.3Legal Information Institute. 26 USC 4980H(c)(2) – Applicable Large Employer Add that to your full-time headcount for your total.
Payroll records need to be accurate, because the IRS can audit this calculation and being wrong in either direction creates problems.
When Related Businesses Get Combined
Owners of multiple companies often assume each entity counts separately for the 50-FTE test. That’s frequently wrong. Under Section 414 of the Internal Revenue Code, businesses with common ownership or that are otherwise related are combined and treated as a single employer.4Internal Revenue Service. Determining if an Employer Is an Applicable Large Employer Three locations of 20 employees each aren’t three small businesses; they’re one employer with 60.
The aggregation rules cover parent-subsidiary groups, brother-sister companies under common control, and affiliated service groups. Ownership of 80% or more of two businesses almost always means the IRS treats them as one for ACA purposes. This is one of the most commonly overlooked pieces of the classification.
What Employers at 50 or More FTEs Face
Crossing the 50-FTE line changes everything. Employers that don’t offer minimum essential coverage to at least 95% of full-time employees can be charged $3,340 per year (for 2026 plan years) for each full-time employee beyond the first 30.1Office of the Law Revision Counsel. 26 USC 4980H – Shared Responsibility for Employers Regarding Health Coverage A second penalty of $5,010 per year applies for each full-time employee who receives a premium tax credit through the marketplace because the offered coverage didn’t meet minimum value or affordability standards. Coverage is “affordable” in 2026 if the employee’s required contribution for self-only coverage doesn’t exceed 9.96% of household income.5Internal Revenue Service. Revenue Procedure 2025-25
None of these penalties apply to employers under 50 FTEs. That is the core benefit of being below the threshold. Offering coverage anyway still triggers a set of rules about how that coverage must work.
Rules When a Small Employer Offers Coverage
Once you sponsor a group health plan, ACA rules apply whether or not you were required to offer one. The most consequential is the 90-day waiting period limit: federal regulations prohibit any group health plan from imposing a waiting period longer than 90 days before new employees can enroll.6eCFR. 45 CFR 147.116 – Prohibition on Waiting Periods That Exceed 90 Days Shorter is fine; longer is not.
Small group plans use a tiered “metal” system based on how much of total costs the plan covers on average. Bronze covers about 60%, Silver 70%, Gold 80%, and Platinum 90%.7HealthCare.gov. Health Plan Categories: Bronze, Silver, Gold, and Platinum Employees pay the rest through deductibles, copays, and coinsurance. A lower metal tier means lower premiums but higher out-of-pocket costs for employees when they use care.
Employers offering group coverage must give each participant a Summary of Benefits and Coverage, a standardized plain-language document. All group health plans, including small-employer plans, must also pay the Patient-Centered Outcomes Research Institute fee. For plan years ending between October 2025 and September 2026, the fee is $3.84 per covered life, filed on IRS Form 720 by July 31 of the following year.8Internal Revenue Service. Patient Centered Outcomes Research Trust Fund Fee Questions and Answers For fully insured plans, the carrier pays the fee; only self-insured plan sponsors file Form 720 directly.
The Small Business Health Care Tax Credit
The main financial incentive for small employers who offer insurance is the Section 45R credit. It covers up to 50% of premiums you pay for employees, or up to 35% for tax-exempt organizations.9Office of the Law Revision Counsel. 26 USC 45R – Employee Health Insurance Expenses of Small Employers The eligibility rules are strict, though, and the phaseout kicks in well before the hard caps.
Three conditions must all be met:
- Fewer than 25 full-time equivalent employees for the tax year. Owners, partners, 2% S-corporation shareholders, 5% owners, and their family members don’t count toward this total.
- Average annual wages under $67,000 per FTE, based on the most recent IRS guidance.
- Employer contribution of at least 50% of the premium cost for employee-only coverage under a qualifying arrangement.10U.S. Government Publishing Office. 26 USC 45R – Employee Health Insurance Expenses of Small Employers
The credit begins phasing out once you have more than 10 FTEs or pay average wages above $33,000. Both phaseouts compound when they apply together, and the credit can shrink to zero well before you hit the 25-FTE or $67,000 caps.11Internal Revenue Service. Instructions for Form 8941 The wage threshold is adjusted annually for inflation, so check current Form 8941 instructions before assuming you qualify.
The credit is available for only two consecutive tax years once you begin purchasing coverage through the marketplace.10U.S. Government Publishing Office. 26 USC 45R – Employee Health Insurance Expenses of Small Employers If the credit exceeds your tax liability, the unused portion can be carried back one year or forward up to 20 years as part of the general business credit.12Office of the Law Revision Counsel. 26 USC 39 – Carryback and Carryforward of Unused Credits Tax-exempt entities receive it as a refund against payroll taxes. Claim it on IRS Form 8941 and carry it to your business return.
Buying Through SHOP
The Small Business Health Options Program is the ACA marketplace for employers with 1 to 50 employees, and buying through SHOP is a prerequisite for claiming the Section 45R credit. Applications need your federal Employer Identification Number and an employee census with each eligible worker’s name, date of birth, Social Security number, and residential zip code, since premiums are rated partly on location.13HealthCare.gov. Small Business Health Options Program
Enrollment varies by state. Some states run their own SHOP exchanges with full online enrollment; in states using the federal marketplace, employers typically work with a registered agent or broker. After choosing a plan and metal tier, you sign a participation agreement and make an initial premium payment to the carrier, usually a few days before the coverage effective date.
SHOP plan availability varies significantly by region, and in some areas only one or two carriers participate. Comparing SHOP options against plans available directly from insurers or through a broker is worth the time, though only SHOP-purchased plans qualify for the Section 45R credit.
QSEHRA and ICHRA Instead of Group Coverage
If you don’t want to sponsor a group plan, two reimbursement arrangements let you give employees money toward individual coverage instead.
Qualified Small Employer Health Reimbursement Arrangement
A QSEHRA is available only to employers with fewer than 50 full-time employees that do not already offer a group health plan. You give employees a monthly allowance to reimburse individual health insurance premiums and qualified medical expenses. For 2026, the IRS caps annual reimbursements at $6,450 for self-only coverage and $13,100 for family coverage.14Internal Revenue Service. Revenue Procedure 2025-32 The allowance must be spread evenly across 12 months, not paid as a lump sum.
Reimbursements are tax-free to employees who have qualifying individual coverage. Amounts above the IRS limits would be taxable. Mid-year hires get a prorated annual limit. A QSEHRA is simpler than group coverage and lets employees choose their own plan, but the caps work best in areas with moderate individual-market premiums.
Individual Coverage Health Reimbursement Arrangement
An ICHRA works similarly but has no cap on employer contributions and no employer-size restriction. Any employer with at least one non-owner employee can offer one.15HealthCare.gov. Individual Coverage Health Reimbursement Arrangements (HRAs) Employees use the reimbursement toward premiums and out-of-pocket costs on an individual plan they buy themselves.
The main difference from a QSEHRA is flexibility. Employers can offer different ICHRA amounts to different classes of employees based on criteria like full-time versus part-time, geographic location, or salaried versus hourly.15HealthCare.gov. Individual Coverage Health Reimbursement Arrangements (HRAs) An employer generally cannot offer both a traditional group plan and an ICHRA to the same class of employees. When offering both to different classes, minimum class sizes apply: at least 10 employees in the ICHRA class for employers with fewer than 100 workers. If you don’t offer a group plan to anyone, class minimums don’t apply. Written notice to employees is required at least 90 days before the start of each plan year.
Reporting You’ll Actually File
Small employers that sponsor self-insured group health plans must file IRS Forms 1094-B and 1095-B to report who had coverage during the year.16Internal Revenue Service. Instructions for Forms 1094-B and 1095-B If you buy a fully insured plan through SHOP or directly from a carrier, the insurance company handles 1095-B reporting for covered employees, not you.
Under current rules, employers filing Form 1095-B don’t have to automatically mail the form to each covered individual. Posting a clear notice on your website explaining that individuals may request a copy satisfies the requirement. When someone requests their form, you must provide it within 30 days or by January 31 of the following year, whichever is later.16Internal Revenue Service. Instructions for Forms 1094-B and 1095-B Employers at 50 or more full-time equivalents file the C-series forms (1094-C and 1095-C) instead, so the B forms are primarily a small-employer concern and only for those with self-insured plans.