Pay equity is the HR topic where state law has moved fastest in the past five years. The federal Equal Pay Act of 1963 set the floor, but most meaningful enforcement now happens under state laws that use broader "substantially similar work" standards and allow class actions more easily. California's Fair Pay Act (2015, amended multiple times), Massachusetts Equal Pay Act (2018), New York's Achieve Pay Equity Law, and similar laws in Colorado, Washington, Illinois, and Oregon have created a patchwork that most multi-state employers navigate by aligning to the strictest standard. The compliance question and the moral question produce the same answer: do the audit, fix what you find.
How Pay Equity Audits Actually Work Statistical audits compare compensation across demographic groups while controlling for role, tenure, performance, location, and level. The residual after controls represents the "unexplained" gap. Rigorous audits use multiple regression and account for occupational segregation effects separately.
What State Pay Equity Laws Require California requires equal pay for substantially similar work under similar conditions. Massachusetts bans salary history inquiries. Colorado requires pay range disclosure in job postings. New York prohibits retaliation against employees discussing pay. Most state laws combine prohibitions on disparities with transparency requirements that let employees detect them.
Where Residual Pay Gaps Come From The most common drivers are starting salary differences that compound over time (often tied to salary history), merit cycle inconsistencies across managers, promotion timing differences, and occupational segregation within roles. See gender wage gap for the demographic patterns.
Running Pay Equity Audits That Actually Close Gaps Effective programs combine annual statistical audits, budget for adjustments when gaps are found, manager training on merit and promotion decisions, and structured pay bands with transparent advancement criteria. Audits without adjustment budgets produce paper findings and no movement. HR case management tooling helps when pay equity complaints need investigation, and pulse surveys surface the qualitative side of pay perception. For broader context: glass ceiling and discrimination law intersect closely with pay equity. EEOC reference: eeoc.gov/equal-pay-discrimination.
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