Equal Pay Act

The 1963 federal law requiring equal pay for equal work regardless of sex — the first federal wage discrimination law, and the foundation for modern pay equity enforcement.

The Equal Pay Act of 1963 is a federal law that prohibits employers from paying employees of different sexes differently for substantially equal work performed under similar working conditions at the same establishment. It was the first federal law to directly address sex-based wage discrimination and was enacted a year before Title VII of the Civil Rights Act. The EPA requires equal pay for jobs that require equal skill, effort, and responsibility — not just identical job titles. An employer cannot pay a female accountant less than a male accountant performing the same work simply because of their sex.

The EPA is enforced by the Equal Employment Opportunity Commission and applies to virtually all employers. To prove an EPA violation, an employee must show that they were paid less than an employee of the opposite sex for substantially equal work. The burden then shifts to the employer, which must demonstrate that the pay difference is justified by one of four affirmative defenses: a seniority system, a merit system, a system that measures earnings by quantity or quality of production, or a factor other than sex (such as experience, education, or market rates for specific skills). The 'factor other than sex' defense has been interpreted broadly by some courts and narrowly by others, making it the most contested aspect of EPA litigation.

The EPA's limitations have been well-documented. It covers only sex-based wage discrimination, not race, national origin, or other characteristics (those are addressed under Title VII). It applies only to unequal pay at the same establishment, which limits its reach in large multi-location employers. And critically, it requires a direct comparator — a similarly situated person of the opposite sex earning more — rather than allowing statistical or pattern-based evidence of discrimination. Several states have enacted stronger pay equity laws that address these gaps: California's Fair Pay Act allows comparisons to workers at other locations of the same employer; Massachusetts and New York have similar expansions.

Equal Pay Act vs. Title VII vs. State Pay Equity Laws

The EPA, Title VII, and state pay equity laws address pay discrimination from different angles and with different tools. The EPA requires equal pay for equal work and applies a strict comparator analysis — you must identify a specific person of the opposite sex doing substantially equal work for more pay. Title VII is broader: it prohibits pay discrimination based on any protected characteristic (race, sex, religion, national origin, age for 40+) and allows statistical evidence of discriminatory patterns rather than requiring a direct comparator. State laws vary widely in their strength — California, New York, Massachusetts, and Colorado have among the most expansive pay equity protections, including mandatory pay range disclosure in job postings (Colorado, New York, California, Washington), prohibitions on salary history inquiries, and expanded comparator classes that allow comparing to workers in different locations or similar roles with different titles.

What to Do If You Suspect a Pay Equity Violation

  • Document: gather evidence of the pay difference — job descriptions, your salary, and any information about comparators' pay (Glassdoor, pay transparency laws, direct conversations).
  • Understand your state's laws: many states have stronger protections than federal law, longer filing deadlines, and better remedies.
  • File with the EEOC: EPA claims must be filed within 2 years (3 years for willful violations) — different from Title VII's 180/300-day deadline.
  • File simultaneously under both the EPA and Title VII when possible — each provides different remedies and different procedural paths.
  • Consult an employment attorney: most work on contingency for pay discrimination cases. Many offer free initial consultations.
  • Retaliation protection: you cannot be penalized for discussing your salary with coworkers or for filing an EPA or Title VII claim.

Example

A female sales manager discovers through a pay transparency disclosure that her male counterpart — same title, same region, same quota — earns $22,000 more per year. Her employer's stated reason is that he 'negotiated harder.' She consults an employment attorney who advises that 'negotiated harder' may not qualify as a legitimate factor other than sex under the EPA, particularly given equal performance metrics. She files an EPA and Title VII claim and reaches a settlement including back pay and prospective salary adjustment.