Smiley v. Citibank, (517 U.S. 735), is a 1996 U.S. Supreme Court decision upholding a regulation of the Comptroller of Currency which included credit card late fees and other penalties within the definition of interest and thus prevented individual states from limiting them when charged by nationally-chartered banks. Justice Antonin Scalia wrote for a unanimous court that the regulation was reasonable enough under the Court's own Chevron standard for the justices to defer to the Comptroller.