Employee Benefits Law: Required and Optional Benefits for US Employers

Employee benefits are a significant component of compensation and a major area of legal compliance for US employers. The benefits landscape is complex because federal and state law mandates some benefits, gives employers the option to offer others, and imposes detailed regulatory requirements on virtually all benefits programs — including those that are entirely voluntary. Understanding which benefits you must provide, which you may provide, and what legal requirements govern each is foundational to operating a compliant employer.

Legally Required Benefits

Social Security and Medicare

All US employers with employees must withhold and remit FICA taxes — the combined employer and employee contributions to Social Security (6.2% of wages up to the annual wage base, paid by both employer and employee) and Medicare (1.45% of all wages, paid by both employer and employee, plus an additional 0.9% employee contribution on wages above $200,000). These contributions fund the Social Security retirement and disability system and the Medicare healthcare program. There is no exemption for small employers.

Unemployment Insurance

Federal and state unemployment insurance taxes fund temporary wage replacement for workers who lose their jobs through no fault of their own. The Federal Unemployment Tax Act (FUTA) imposes a 6% tax on the first $7,000 of each employee’s wages per year, with a credit of up to 5.4% for employers who pay state unemployment taxes on time in states that are not subject to a federal credit reduction. Effective FUTA rates for most employers are therefore 0.6% on the first $7,000. State unemployment insurance (SUI) rates and wage bases vary widely and are experience-rated, meaning employers with more claims pay higher rates.

Workers Compensation

Workers compensation insurance is required by law in virtually every state for employers with employees. It provides medical and wage replacement benefits to employees injured or made ill by their work, and in exchange, limits the employer’s liability for workplace injuries to the workers’ compensation system (with limited exceptions). Rates are set by state and vary by industry classification and claims history.

The ACA Employer Mandate

The Affordable Care Act’s employer mandate requires applicable large employers — employers with 50 or more full-time equivalent employees — to offer minimum essential coverage to full-time employees (those working 30 or more hours per week on average) and their dependent children up to age 26, or pay a penalty. Coverage must be affordable (the employee’s required premium contribution for self-only coverage cannot exceed a specified percentage of household income, indexed annually) and must provide minimum value (cover at least 60% of expected costs).

Employers with fewer than 50 FTEs are not subject to the ACA employer mandate, though they may be eligible for the small business health care tax credit if they offer coverage through the Small Business Health Options Program (SHOP) marketplace. The credit is worth up to 50% of the employer’s premium contributions for businesses with fewer than 25 FTEs and average wages below $56,000 (adjusted for inflation).

COBRA: Health Coverage Continuation

The Consolidated Omnibus Budget Reconciliation Act requires employers with 20 or more employees who sponsor group health plans to offer covered employees and their dependents the right to continue health coverage for a specified period (18 months for loss of coverage due to termination or reduction in hours, up to 36 months for other qualifying events) at the employee’s own expense (up to 102% of the group rate, including a 2% administrative fee). COBRA requires specific notice obligations at various stages of the continuation period, and failure to comply with COBRA can result in significant excise tax liability.

ERISA and Voluntary Benefits

Virtually all employer-sponsored benefits beyond the statutory minimums — health insurance, retirement plans, disability insurance, life insurance, flexible spending accounts, and others — are governed by the Employee Retirement Income Security Act (ERISA). ERISA imposes fiduciary duties on those who manage and control employee benefit plan assets, requires specific plan documents and summary plan descriptions, mandates annual reporting on Form 5500 (for plans above certain size thresholds), and provides a federal enforcement mechanism for participants whose rights are denied.

The fiduciary duty under ERISA requires plan fiduciaries to act solely in the interest of plan participants and beneficiaries and to use plan assets exclusively for the benefit of participants. Employers who sponsor retirement plans and who have discretion over plan investments are plan fiduciaries subject to these duties. Breach of fiduciary duty can result in personal liability for the fiduciary. The selection and monitoring of plan investment options and service providers are fiduciary functions that require a documented, prudent process.

Paid Leave: The Growing Mandate Landscape

Federal law does not require private employers to provide paid vacation, paid sick leave, or paid family leave. But an increasing number of states and localities do. California, New Jersey, New York, Washington, Massachusetts, Connecticut, Colorado, Oregon, Delaware, Maryland, and others have enacted mandatory paid sick leave and/or paid family and medical leave programs. Several major cities, including New York City, Seattle, Chicago, and Portland, have their own paid sick leave ordinances. Employers with employees in multiple states must comply with the most favorable applicable law in each state.

The Bottom Line

Employee benefits compliance is a multi-layered obligation covering tax law, ERISA, the ACA, COBRA, state insurance laws, and an expanding body of state and local paid leave mandates. Employers who want to offer competitive benefits packages need to understand not just the market norms but the legal requirements governing each benefit they provide. Working with a benefits broker, a benefits attorney, and a qualified payroll provider familiar with applicable state requirements is the most reliable way to manage this complexity without inadvertently creating compliance gaps.