The Equal Pay Act is a federal law that prohibits pay discrimination on the basis of sex. Unlike Title VII and state anti-discrimination laws that prohibit sex discrimination in the workplace, the EPA prior to sex discrimination act applies to compensation disparity between the sexes. The federal Ninth Circuit issued its decision in a case involving the Equal Pay Act surrounding the use of salary history as a deciding factor in salary and wage rates. This broad rule has employer-side employment lawyers around the country in a tizzy. Then the salary steps up at set intervals.