The day before Equal Pay Day, the U.S. Court of Appeals for the Ninth Circuit, sitting en banc, ruled that employers defending claims under the Equal Pay Act cannot rely on workers’ past salaries in any respect in trying to justify pay disparities between women and men. Aileen Rizo v. Jim Yovino, 16-15372, 2018 WL 1702982 (9th Cir. Apr. 9, 2018) (en banc). This ruling expressly overturns the Ninth Circuit’s prior holding in Kouba v. Allstate Insurance Co., 691 F.2d 873 (9th Cir. 1982), conflicts with rulings from other circuits, and tees up a very important issue for potential Supreme Court review.