Equal pay and pay transparency in the United States
Reviewed by Mellow Editorial Team, HR & payroll content team
Equal pay law in the US operates on multiple levels — federal baseline protections, a patchwork of stronger state laws, and a fast-growing set of state and local pay transparency requirements. Compliance means understanding all three layers that apply to your workforce.
This article is general information, not legal advice. Consult an employment attorney for guidance specific to your situation.
The federal equal pay framework
The Equal Pay Act of 1963 requires that men and women performing substantially equal work — in terms of skill, effort, and responsibility, under similar working conditions — receive equal pay. "Pay" covers wages, bonuses, benefits, and other compensation.
Title VII of the Civil Rights Act extends the principle further by prohibiting pay discrimination based on race, color, religion, sex, or national origin. The Age Discrimination in Employment Act and the Americans with Disabilities Act add parallel protections for those groups.
Under the Equal Pay Act, employers can justify pay differences only through four defenses: a seniority system, a merit system, a system measuring earnings by quantity or quality of production, or a factor other than sex. That last category — "any other factor other than sex" — has historically been contested territory. Courts have scrutinized whether an employer is using a facially neutral factor (such as prior salary history) as a proxy for sex-based discrimination.
What pay transparency laws actually require
Pay transparency laws vary significantly by jurisdiction, but most fall into one or more of these categories:
Salary range disclosure in job postings. Several states and localities now require employers to include a pay range in job advertisements. Colorado, New York, California, and Washington are among the most prominent examples. Requirements differ on whether the range must appear in the posting itself or can be provided on request, and on what counts as a sufficiently "good faith" range.
Pay range disclosure to applicants and employees. Some laws require employers to share a salary range when an applicant asks, when a job offer is made, or when an existing employee is considered for a promotion or transfer.
Pay data reporting. California requires certain employers to submit pay data reports to a state agency, broken down by race, ethnicity, sex, and job category. Similar requirements exist or are developing in other states. These reports are intended to surface systemic disparities rather than individual complaints.
Because employment is generally at-will in the US and workforce arrangements increasingly span multiple states, a company hiring remotely needs to track which laws apply based on where the employee works — not just where the company is headquartered.
Building a defensible pay structure
The practical risk in equal pay cases is not always intentional discrimination. Unexamined pay decisions accumulate over time: an ad hoc raise here, a negotiated starting salary there. The result can be statistically significant gaps that are difficult to explain under legal scrutiny.
A few practices reduce that risk:
Establish documented pay bands. Define salary ranges for each role or job grade, tied to objective factors like scope of responsibility, required experience, and market benchmarking. Document why the bands are set where they are.
Apply consistent criteria at hire. Decide in advance what factors determine where within a band a new hire starts — years of relevant experience, specific technical skills, internal equity. Relying heavily on a candidate's prior salary is legally risky in several states that have restricted salary history inquiries, including California, New York, and Illinois.
Conduct periodic pay equity audits. An audit compares compensation across employees doing substantially similar work, controlling for legitimate factors. The goal is to identify unexplained gaps before they become complaints or litigation. Some employers conduct these internally; others use outside counsel to preserve attorney-client privilege over the findings.
Train managers. Merit increase budgets and promotion decisions often flow through managers who may be unaware of equity obligations. Training on how to document and justify pay decisions is practical risk management.
Salary history bans and their effect on hiring
More than a dozen states and additional localities have enacted laws that limit whether employers can ask about or rely on an applicant's prior compensation. The rationale is that prior pay can encode historical discrimination — if a candidate was underpaid at a previous employer because of their gender or race, using that figure to anchor a new offer perpetuates the gap.
In practice, this means hiring managers need a defined starting-point methodology that doesn't depend on what the candidate previously earned. Budget for the role, internal pay band position, and the candidate's qualifications relative to the role's requirements are all defensible inputs.
What employees can and cannot be told
The National Labor Relations Act protects most private-sector employees' right to discuss their wages with coworkers. Policies that prohibit employees from talking about pay are generally unenforceable and potentially unlawful. This is a common misconception among smaller employers — "confidential compensation" policies don't override federal labor rights.
At the same time, employers are not required by federal law to proactively disclose everyone's salary to the whole workforce. The distinction is between prohibiting discussion (not permitted) and choosing not to publish a full salary ledger (generally permitted, absent a specific state requirement to the contrary).
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