A lender (such as a bank) may permit a customer to withdraw from their account amounts in excess of their current credit balance. The amount by which the withdrawal exceeds the balance is known as the overdraft. An overdraft is an uncommitted loan facility, which almost always must be repaid on the demand of the lender, and which is capable of being required by the lending bank to be repaid (or reduced to zero) at any time, even if the customer is not in default. An overdraft is a common form of temporary finance for businesses.