Equal Pay Act Lawsuit: Proof, Defenses, and Recovery

An Equal Pay Act lawsuit lets a worker sue an employer in federal court for paying men and women different wages for substantially equal work, without first going through the Equal Employment Opportunity Commission and without proving the employer meant to discriminate. Once you show the pay gap for equal work, the employer has to justify it under one of four narrow defenses. If it can’t, you win — typically back pay for two or three years, doubled as liquidated damages, plus attorney’s fees.

Who Can Sue and by When

The Equal Pay Act of 1963 amended the Fair Labor Standards Act and reaches almost every employer in the country. That is a broader net than Title VII of the Civil Rights Act, which exempts businesses with fewer than 15 employees.¹

You can file directly in federal court. There is no requirement to file a charge with the EEOC first and no need to wait for a right-to-sue letter, which is where Equal Pay Act procedure diverges most sharply from Title VII.²

The deadline is two years from the last discriminatory paycheck, or three years if the violation was willful.² Each underpaid paycheck starts a new clock. That paycheck-accrual rule is codified for both the EPA and Title VII by the Lilly Ledbetter Fair Pay Act of 2009, which Congress passed in response to a Supreme Court ruling that had tied the Title VII deadline to the employer’s original pay decision.³ If you have just discovered a long-running pay disparity, you are not automatically shut out.

What You Have to Prove

To make a prima facie case, you have to show that your employer pays workers of the opposite sex at a higher rate for work requiring equal skill, effort, and responsibility, performed under similar working conditions, in the same establishment.⁴

A few points about that standard are worth pinning down. The jobs do not have to be identical. Courts compare actual duties and performance, not job titles or classifications, and the standard is “substantially equal.”¹ You need a real-world comparator of the opposite sex at the same establishment; a generalized claim that women in your field earn less is not enough.

“Wages” is read broadly. It covers salary, overtime, bonuses, stock options, insurance, retirement contributions, and other fringe benefits, so a lawsuit can be built on a gap in any of those.⁵

You do not have to prove the employer intended to discriminate. The Equal Pay Act imposes strict liability once the pay gap for equal work is established.¹

The Four Employer Defenses

Once the pay gap is on the record, the burden shifts entirely to the employer, which must prove the difference falls within one of four statutory exceptions:⁶

A seniority system that bases pay on length of service.
A merit system that ties compensation to measured performance.
A system measuring quantity or quality of production, such as a commission or piece-rate structure.
Any other factor other than sex — a catchall that has produced most of the litigation.

The Supreme Court’s decision in Corning Glass Works v. Brennan established that these are affirmative defenses. The employer carries the burden, not the worker.⁷ The EEOC has argued that the burden never shifts back to the worker to show the employer’s justification is a pretext, a position it pressed in an amicus brief in the Eleventh Circuit’s Williams v. Alabama State University case in 2023.⁸

The Salary History Problem and Why Venue Matters

The “any other factor other than sex” defense is where most Equal Pay Act cases are won or lost, and the federal circuits do not agree on how far it stretches. The recurring question is whether an employer can point to a worker’s prior salary to justify paying her less than a male peer.

In Rizo v. Yovino, the Ninth Circuit ruled in 2020 that prior pay is never a “factor other than sex” and that the defense is limited to job-related factors. Aileen Rizo, a math consultant, had discovered her California school district set salaries by adding a flat percentage to each new hire’s prior pay, which produced a gap between her and her male colleagues. The Supreme Court declined to review the decision in July 2020.⁹¹⁰

Other circuits read the defense differently. The Seventh Circuit says the justifying factor only needs to be unrelated to sex, with no job-relatedness requirement. The Second, Fourth, Sixth, Tenth, and Eleventh Circuits have held that prior salary standing alone cannot justify a pay gap, though some accept it combined with other factors. The Eighth Circuit decides case by case.¹¹

In October 2023, the Second Circuit went further in Eisenhauer v. Culinary Institute of America, ruling that the federal Equal Pay Act’s plain text does not require the “factor other than sex” to be job-related at all. The court acknowledged its position was at odds with Rizo and noted that New York’s state equal pay law is stricter, expressly requiring any such factor to be job-related.¹²¹³

The practical takeaway is that where you file matters. The same set of facts can produce different outcomes depending on the circuit’s rule on salary history and job-relatedness.

What You Can Recover

A winning plaintiff can recover several forms of relief:

Back pay — the difference between what you were paid and what you should have been paid. Non-willful violations reach two years back from the filing date; willful violations reach three years.¹⁴
Liquidated damages equal to the back pay award, effectively doubling the recovery, unless the employer proves it acted in good faith and reasonably believed it was complying with the law.¹⁵
Front pay, meaning an order requiring the employer to raise your compensation going forward to eliminate the disparity.¹⁵
Reasonable attorney’s fees and costs.¹⁵

If liquidated damages are not awarded, the court may grant prejudgment interest instead. And an employer cannot fix a violation by cutting anyone’s wages. The only lawful remedy is to raise the pay of the lower-paid group.⁷

Filing With Others: Collective Actions

Because the Equal Pay Act sits inside the Fair Labor Standards Act, group cases follow the FLSA collective action procedure rather than the class action rules under Federal Rule of Civil Procedure 23. The difference matters: coworkers must affirmatively opt in by filing written consent with the court. They are not swept in automatically the way a Rule 23 class binds absent members unless they opt out.¹⁶

Most federal courts use a two-stage certification process. Early on, the named plaintiff makes a modest showing that other workers are “similarly situated,” and the court authorizes notice to potential opt-ins. Later, after discovery, the court takes a harder look at whether the workers are similar enough to proceed together. If not, the group can be decertified and the opt-in plaintiffs dismissed without prejudice.¹⁶ The Fifth and Ninth Circuits have rejected this two-step framework in favor of stricter early scrutiny, so the roadmap depends on jurisdiction.

Collective actions have driven some of the largest recoveries. A class of female Family Dollar store managers reached a $45 million settlement in 2018 after litigation that began with EEOC charges filed by nearly 50 women in 2002. The company also agreed to review its compensation practices with the help of labor economists.¹⁷

Equal Pay Act or Title VII

Gender-based pay discrimination can often be pursued under both the Equal Pay Act and Title VII of the Civil Rights Act, and many plaintiffs’ lawyers file under both to preserve every option. The two statutes differ in ways that shape strategy.

Filing process. The EPA lets you go straight to court. Title VII requires filing a charge with the EEOC and waiting for a right-to-sue letter.²
Deadlines. EPA: two or three years from the last discriminatory paycheck. Title VII: 180 or 300 days to file the EEOC charge, depending on the state.²
Burden of proof. Under the EPA, once you show the pay gap, the employer has to prove a defense. Under Title VII, you carry the ultimate burden of proving discrimination.¹⁸
Scope. The EPA requires a comparator of the opposite sex doing substantially equal work in the same establishment. Title VII covers pay discrimination based on sex, race, religion, and national origin, and does not require a same-establishment comparator or proof of substantially equal work.¹⁸
Intent. The EPA does not require proof of discriminatory intent. Title VII generally does.

Stronger State Laws

Many states have equal pay laws that are more protective than the federal statute. California, Illinois, and New Jersey use a “substantially similar work” standard; Massachusetts uses “comparable work.” These are easier to satisfy than the federal “equal work” test.¹⁹

Salary history bans, which prohibit employers from asking applicants about prior pay, are in effect in California, Delaware, Hawaii, Massachusetts, New Jersey, Oregon, Vermont, and several major cities. Massachusetts and Oregon go further, letting employers that conduct voluntary pay-equity audits use those audits as an affirmative defense.¹⁹

Pay transparency laws are the newest layer. As of mid-2026, 17 states and the District of Columbia require some form of salary range disclosure — in job postings, on request, or at the offer stage. Virginia and Maine joined the list in 2026, and Delaware’s law takes effect in 2027.²⁰ If you are trying to figure out whether a pay gap exists in the first place, those disclosures — plus state protections for workers who discuss wages with coworkers — are often where the evidence starts.

1
AAUW. Equal Pay Act
2
EEOC. Time Limits for Filing a Charge
3
EEOC. Equal Pay Act of 1963 and Lilly Ledbetter Fair Pay Act of 2009
4
EEOC. Equal Pay Act of 1963
5
eCFR. Interpretive Bulletin on the Equal Pay Act
6
U.S. Courts for the Third Circuit. Model Civil Jury Instructions, Chapter 11
7
Justia. Corning Glass Works v. Brennan, 417 U.S. 188
8
EEOC. Williams v. Alabama State University Amicus Brief
9
U.S. Court of Appeals for the Ninth Circuit. Rizo v. Yovino, 950 F.3d 1217
10
Boston College Law Review. Rizo v. Yovino Analysis
11
Workforce Bulletin. U.S. Supreme Court Lets Stand Ninth Circuit Ban on Salary History Defense
12
Seyfarth Shaw. Developments in Equal Pay Litigation
13
Workplace Class Action Blog. Key Developments in Equal Pay Litigation
14
U.S. Department of Labor. Back Pay
15
vLex. Remedies Under the Equal Pay Act
16
Epstein Becker Green. Defending Wage and Hour Collective Actions Under the FLSA
17
Bachman Law. Class Action Gender Pay Discrimination Case Settles for $45 Million
18
A Better Balance. Equal Pay Fact Sheet
19
L&E Global. Pay Equity Laws – USA
20
ADP. Your Updated Guide to Pay Disclosure Requirements