The invention relates to a device for handling banknotes comprising an input and output unit, a control unit, at least one money cassette, a reject cassette and a transport unit to transport the banknotes. In addition, a stock counter is provided that indicates the current quantity of banknotes in the money cassette. When an incorrect withdrawal occurs after at least one banknote is removed from the money cassette, the banknotes from this incorrect withdrawal are transported to the reject cassette. A reject counter is assigned to the money cassette that indicates the total number of banknotes removed from said money cassette and taken to the reject cassette, wherein the value of said reject counter is increased by the value of the banknotes transported to the reject cassette when the incorrect withdrawal occurs. A virtual auxiliary cassette is set up in the software of the control unit.