What Is the ACA Employer Mandate?

The Affordable Care Act's Employer Shared Responsibility provisions — commonly called the "employer mandate" or "pay or play" rules — require certain employers to offer health insurance coverage to their full-time employees or potentially pay a penalty to the IRS. These rules have been in effect since 2015 and apply to what the IRS calls Applicable Large Employers (ALEs).

Understanding whether your business qualifies as an ALE, what coverage you must offer, and how penalties are calculated is essential for any Massachusetts business owner with a growing workforce.

Who Is an Applicable Large Employer (ALE)?

You are an ALE for a given calendar year if you employed an average of 50 or more full-time employees — including full-time equivalent (FTE) employees — during the preceding calendar year. Importantly, this calculation includes both full-time workers and a proportional count of part-time workers converted to FTEs.

The IRS defines a full-time employee as someone who works an average of 30 or more hours of service per week, or 130 or more hours in a calendar month. Part-time employees are converted to FTEs by adding up their monthly hours (capped at 120 per individual) and dividing by 120.

For example, if you have 40 full-time employees and 20 part-time employees each working 60 hours per month, your FTE count would be: 40 + (20 × 60 ÷ 120) = 40 + 10 = 50 FTEs — placing you squarely at the ALE threshold.

Use our free FTE Calculator to determine your exact FTE count based on the IRS methodology.

What Coverage Must ALEs Offer?

If you are an ALE, you must offer health coverage to at least 95% of your full-time employees and their dependents. That coverage must meet two standards:

1. Minimum Essential Coverage (MEC)

The plan must be a qualifying health plan — typically any major medical group health plan offered through a licensed insurer qualifies. Most standard group health plans from carriers like Blue Cross Blue Shield of Massachusetts, Harvard Pilgrim Health Care, Aetna, and Cigna automatically meet this standard.

2. Minimum Value

The plan must cover at least 60% of the total allowed cost of benefits — essentially, it must have an actuarial value of 60% or higher. This is sometimes described as a "bronze-level" plan or better. Plans that are bare-bones or cover only preventive care generally do not meet this standard.

3. Affordability

The employee's required contribution for the lowest-cost, self-only coverage must not exceed a set percentage of their household income. For 2025, the IRS affordability threshold is 9.02% of household income. Because employers rarely know an employee's exact household income, the IRS provides three safe harbors — the most common being the W-2 Safe Harbor, which uses the employee's W-2 Box 1 wages as a proxy.

What Are the Penalties for Non-Compliance?

There are two types of employer shared responsibility payments (ESRPs), commonly called Penalty A and Penalty B.

Penalty A — Failure to Offer Coverage

If an ALE fails to offer minimum essential coverage to at least 95% of its full-time employees and at least one full-time employee receives a premium tax credit through the Health Insurance Marketplace, the employer owes an annual payment of $2,970 per full-time employee (2024 rate), with the first 30 employees excluded from the calculation.

Penalty B — Coverage Is Unaffordable or Lacks Minimum Value

If an ALE offers coverage but it is unaffordable or does not provide minimum value, and at least one full-time employee receives a premium tax credit, the employer owes $4,460 per full-time employee who receives the subsidy (2024 rate). This penalty is capped at the Penalty A amount.

Both penalty amounts are adjusted annually for inflation. The IRS notifies employers of potential liability through Letter 226-J.

Small Business Exception: The Under-50 Advantage

If your FTE count is below 50, you are not subject to the employer mandate. However, if you have fewer than 25 FTEs with average annual wages below $56,000 (2024), you may qualify for the Small Business Health Care Tax Credit — worth up to 50% of your premium contributions if you purchase coverage through the SHOP Marketplace.

Massachusetts-Specific Considerations

Massachusetts has its own employer health insurance laws that predate the ACA. Under Chapter 58 of Massachusetts General Laws, employers with 11 or more full-time employees must make a "fair and reasonable" contribution toward employee health insurance or pay a per-employee assessment. This state-level requirement applies to businesses below the federal 50-FTE ALE threshold.

Additionally, Massachusetts employers are required to offer employees the option to purchase health insurance through a Section 125 cafeteria plan, which allows employees to pay their share of premiums with pre-tax dollars.

How MedHealth Can Help

Navigating ACA compliance is complex, and the consequences of getting it wrong can be costly. MedHealth Insurance Agency works with Massachusetts businesses of all sizes to identify compliant plan options, structure contributions to meet affordability standards, and ensure your benefits package satisfies both federal and state requirements — all at no cost to your business.

Contact us today for a free compliance review, or use our FTE Calculator to determine your ALE status.