Foreign gamblers cannot be taxed on every winning bet they make in U.S. casinos when they end up losing money overall, a federal appeals court ruled on Tuesday, rejecting current Internal Revenue Service policy. The U.S. Court of Appeals for the District of Columbia Circuit ruled that the IRS must treat foreign gamblers the same way it taxes U.S. bettors when they visit a casino. “After a night of gambling, it’s no fun to walk out of the casino a loser,” wrote Judge Brett Kavanaugh for a unanimous three-judge panel. “But it’s even worse when the IRS, on your way…