Like conventional lenders, microfinanciers must charge interest on loans, and they institute specific repayment plans with payments due at regular intervals. Some lenders require loan recipients to set aside a part of their income in a savings account, which can be used as insurance if the customer defaults. If the borrower repays the loan successfully, then they have just accrued extra savings. Because many applicants cannot offer collateral, microlenders often pool borrowers together as a buffer. After receiving loans, recipients repay their debts together.