Bookkeepers keep track of the day to day financial transactions of companies. Their duties vary greatly according to the size of the company they work for. One person businesses, for example, might be happy to drop their receipts and copies of payments to a bookkeeper to record the data in ways that make it simple to extract for various taxation purposes. In larger companies, the duties of a bookkeeper may include billing customers, making sure that monies due are received and keeping track of all accounts that need to be paid. They may also calculate and pay wages, though in large companies a payroll clerk might also be engaged to calculate and manage all payroll procedures electronically. Bookkeepers also prepare financial statements such as bank reconciliation statements and prepare tax schedules.