Ordinary annuity is a series of equal payments made at the end of each period for over a fixed time period. The ordinary annuity can be made monthly, quarterly, semi-annually or annually. An example of ordinary annuity bond interest payments are Bond interest payments. It is also referred as annuities in arrears. It is characterized by recurring, identical, cash payment amounts at the end of each equal period. Use our online ordinary annuity calculator to find end balance and principal.