Starting today, the Royal Bank of Scotland will become the first bank in the U.K. to impose a negative interest rate on depositors. The negative rate will apply only to corporate customers, including mutual fund managers and pension funds, holding deposits of certain foreign currencies including euros. This means that RBS—in which the U.K. government still maintains a majority ownership stake since its 2008 bailout—will actually charge these customers to “borrow” their deposits. A few weeks...














