The Paycheck Fairness Act is a proposed United States labor law that would add procedural protections to the Equal Pay Act of 1963 and the Fair Labor Standards Act as part of an effort to address the gender pay gap in the United States. A Census Bureau report published in 2008 stated that women's median annual earnings were 77.5% of men's earnings. Recently this has narrowed, as by 2018, this was estimated to have decreased to women earning 80-85% of men's earnings. One study suggests that when the data is controlled for certain variables, the residual gap is around 5-7%; the same study concludes that the residual is because "hours of work in many occupations are worth more when given at particular moments and when the hours are more continuous. That is, in many occupations, earnings have a nonlinear relationship with respect to hours."

The Equal Pay Act of 1963 is a United States labor law amending the Fair Labor Standards Act, aimed at abolishing wage disparity based on sex. It was signed into law on June 10, 1963, by John F. Kennedy as part of his New Frontier Program. In passing the bill, Congress stated that sex discrimination:depresses wages and living standards for employees necessary for their health and efficiency; prevents the maximum utilization of the available labor resources; tends to cause labor disputes, thereby burdening, affecting, and obstructing commerce; burdens commerce and the free flow of goods in commerce; and constitutes an unfair method of competition.