Health and group benefits in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
Employer-sponsored health and group benefits in the US are voluntary at the federal level for most businesses, but they are one of the most significant parts of a compensation package — and getting the structure right matters for hiring, retention, and tax efficiency.
What the law actually requires
The Affordable Care Act (ACA) requires employers with 50 or more full-time equivalent employees — called Applicable Large Employers, or ALEs — to offer minimum essential coverage to full-time employees (those working 30 or more hours per week) or face potential tax penalties. This is the employer mandate.
Businesses with fewer than 50 FTEs have no federal obligation to offer health insurance at all. Many do anyway, because the labor market expects it.
There is no federal requirement to offer dental, vision, life insurance, disability coverage, or any other group benefit. These are entirely discretionary.
Health insurance: the basics of how it works
Most employers who offer health coverage do so through a group health plan, typically administered by a commercial carrier. The employer selects one or more plan options — commonly HMO, PPO, or HDHP (high-deductible health plan) structures — and employees choose from what is offered during an annual open enrollment window.
Costs are split. The employer pays a share of the monthly premium; the employee pays the rest through pre-tax payroll deductions under a Section 125 cafeteria plan. The employer's contribution is a deductible business expense. The employee's payroll deduction reduces their taxable income, which benefits both parties.
There is no mandated employer contribution percentage at the federal level, but to satisfy the ACA's affordability rules, an ALE's employee-only premium contribution must not exceed a set percentage of the employee's household income. The IRS adjusts this threshold annually, so check the current figure before finalizing plan design.
HDHPs are often paired with Health Savings Accounts (HSAs). Employees enrolled in a qualifying HDHP can contribute pre-tax dollars to an HSA to pay for qualified medical expenses. Employers can also contribute to employees' HSAs. The IRS sets annual contribution limits, which change each year.
Group benefits beyond health
Dental and vision are typically offered as separate voluntary plans. Employees opt in and pay some or all of the premium, again through pre-tax deductions where the plan is structured correctly.
Life insurance — most commonly employer-paid group term life — is a relatively low-cost benefit to provide. The IRS allows up to $50,000 of employer-paid group term life coverage to be excluded from an employee's taxable income. Coverage above that threshold creates imputed income, which must be reported on the employee's W-2.
Short-term and long-term disability insurance covers a portion of an employee's income if they cannot work due to illness or injury. A handful of states — including California, New York, and New Jersey — mandate some form of disability insurance coverage. Outside those states, it is voluntary.
401(k) and retirement plans are governed by ERISA and IRS rules. Employers are not required to offer a retirement plan, but many do. Employer matching contributions are deductible and a strong retention tool. Some states are beginning to require employers without a qualified retirement plan to enroll employees in a state-run IRA program — check the rules for each state where you have workers.
Tax treatment at a glance
Benefits delivered through a properly structured Section 125 plan — including health, dental, vision, and FSA contributions — are generally exempt from federal income tax and FICA withholding. That means both the employer and employee save on payroll taxes, not just income tax.
Benefits outside a Section 125 plan, or those that exceed IRS exclusion limits, become taxable wages and must flow through payroll. Imputed income from excess life insurance coverage is a common example that gets missed.
State tax treatment generally follows federal rules for these benefits, but not always — confirm with a tax advisor for the states where you operate.
Practical considerations for plan design
Start with what your workforce actually values. A younger workforce may prioritize HSA-compatible HDHPs and mental health coverage. An older workforce may place more weight on low-deductible options and robust prescription coverage.
Benchmark your contribution levels against comparable employers in your industry and geography. Bureau of Labor Statistics data on employer costs for employee compensation is publicly available and a useful reference.
If you employ people across multiple states — which is increasingly common with remote work — group benefit compliance gets more complex. How Mellow runs payroll across six countries on one platform illustrates how multi-jurisdiction workforce management works in practice. The same principle applies domestically: each state may have its own continuation coverage rules, disability mandates, and notice requirements layered on top of federal law.
Document your plan documents, summary plan descriptions, and ERISA filings carefully. The Department of Labor audits benefit plan compliance, and missing documentation is a common and avoidable problem.
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