Equal Pay Laws in Missouri: Gender Pay Gap Protections

The Equal Pay Act (EPA), 29 U.S.C. § 206(d), is part of the Fair Labor Standards Act and requires equal pay for equal work regardless of sex. It applies to employers with 2 or more employees engaged in commerce. The EPA prohibits paying workers of one sex less than workers of the opposite sex for substantially equal work in the same establishment, when the jobs require equal skill, effort, and responsibility and are performed under similar working conditions.

Substantially equal means the actual job performance requirements must be essentially the same, not identical. Differences in job titles or job descriptions do not automatically mean jobs are unequal. The EPA covers base salary, bonuses, commissions, shift differentials, benefits, and other forms of compensation.

Payment may differ if based on seniority systems, merit systems, systems measuring earnings by quantity or quality of production, or factors other than sex. The burden falls on the employer to prove these exceptions apply. The EEOC enforces the EPA for private employers. Remedies include back pay, front pay, liquidated damages equal to the back pay award, and attorney fees and costs. The statute of limitations is 2 years for willful violations, 3 years.

Missouri's Equal Pay Act, codified at Mo. Rev. Stat. § 290.410, provides state-level protection against wage discrimination based on sex. Missouri's law applies to employers with 4 or more employees, creating a narrower threshold than the federal EPA which covers employers with 2 or more employees. This means some small Missouri employers may be covered by federal law but not state law, while others fall outside both frameworks.

Missouri's Equal Pay Act mirrors the federal EPA in its core prohibition: employers cannot pay employees of one sex less than employees of the opposite sex for substantially equal work. The state law uses the same standard—substantially equal skill, effort, and responsibility, performed under similar working conditions. Like the federal law, Missouri recognizes exceptions for seniority systems, merit systems, systems based on quality or quantity of production, and factors other than sex.

The remedies available under Missouri law include back pay, front pay, liquidated damages equal to the back pay awarded, and attorney fees and costs. Missouri does not provide additional categories of protected characteristics beyond sex and gender, so race-based wage discrimination claims would proceed under federal Title VII rather than the state EPA. The state law does not create a private right of action separate from the state human rights statutes; enforcement occurs through the Missouri Commission on Human Rights.

Missouri employers must ensure that compensation is not based on employee sex. This includes reviewing pay scales, bonuses, benefits, shift differentials, and any other form of compensation. Women in Missouri are protected from wage discrimination on the same terms as men, and the burden rests on the employer to establish that pay differences are justified by nondiscriminatory factors. Violations can expose employers to significant liability including back pay dating to when the discrimination began.

Missouri employers can defend against equal pay claims by demonstrating that pay differences result from legitimate nondiscriminatory factors: a seniority system, a merit system, a system that measures earnings by quantity or quality of production, or any other factor other than sex. These exceptions are narrowly construed; the employer bears the burden of proof.

Jobs need not be identical to be substantially equal. Minor differences in job duties do not defeat an equal pay claim if the core work and job requirements are essentially the same. For example, if one employee performs 90% of the same duties as another but at a higher pay level solely due to sex, this may violate the law. However, if legitimate seniority or performance differences justify the pay gap, no violation exists.

Employers can also defend by showing that a pay difference is based on factors such as education, specialized training, licenses held, or market-based compensation (if applied consistently and not as a pretext for discrimination). However, prior salary alone is increasingly disfavored as a legal basis for pay differences, as it can perpetuate historical discrimination.

At-will employment status does not shield employers from equal pay obligations. An employer cannot avoid liability by arguing that it can fire at will; pay equity is a distinct legal requirement regardless of employment status. Similarly, informal or subjective compensation decisions do not provide a defense; the law focuses on the actual compensation provided, not the process used to determine it.

Employees earning different salaries due to different job classifications (e.g., software engineer vs. account manager) are generally not entitled to equal pay protection, even if employed by the same company. The law applies within the same establishment and for substantially equal work.

Step 1: Document the discrimination. Keep records of your job duties and responsibilities, your compensation (salary, bonuses, commissions, benefits), and the compensation of coworkers performing substantially equal work. Document when you became aware of the pay disparity and any statements by managers about pay decisions. Save performance reviews, emails discussing compensation, and any written job descriptions. Record dates and details of any conversations about your pay or the pay of colleagues. Retain paycheck stubs, benefit statements, and tax documents showing total compensation.

Step 2: Use internal complaint procedures if available. Review your employee handbook for anti-discrimination or pay equity complaint procedures. Submit a formal written complaint to your human resources department, detailing the job duties you perform, the coworker's job duties, the pay difference, and when you became aware of the disparity. Request a response in writing. Keep a copy of your complaint and any responses. Many employers will not retaliate, but document your complaint to create a record. An internal complaint is not required to file a legal claim, but it may prompt the employer to investigate and correct the issue.

Step 3: File a charge with the EEOC. You have 180 days from the most recent discriminatory paycheck to file. Visit www.eeoc.gov or contact the EEOC at 1-800-669-4000 to file online, by mail, or in person at a local office. Provide your name, contact information, employer name and address, description of your job and duties, comparison employee's job and duties, the pay difference, and dates. The EEOC will notify your employer that a charge has been filed. You may also file with the Missouri Commission on Human Rights within the same timeframe.

Step 4: The investigation process. The EEOC will investigate your charge, which typically takes 6 to 12 months. The agency will request information from your employer about pay scales, job descriptions, compensation policies, and performance data for you and comparator employees. You may be asked to provide additional documentation or testify. The EEOC will determine whether reasonable cause exists to believe discrimination occurred. If reasonable cause is found, the EEOC will attempt to conciliate (settle) between you and your employer. If conciliation fails, the EEOC may pursue litigation on your behalf or issue a right-to-sue letter.

Step 5: Consult an employment attorney. Contact a plaintiff-side employment law attorney (one who represents employees, not employers) early in the process, ideally before or shortly after filing your EEOC charge. An attorney can evaluate the strength of your claim, advise on settlement negotiations, and represent you in litigation if needed. Many employment attorneys work on contingency (no upfront fee; they take a percentage of recovery). An attorney can also advise on state-specific remedies and whether federal or state law provides a stronger basis for your claim.