The Iowa Present Value Discount Table is a tool used to calculate the present value of a stream of payments or receipts that occur at regular intervals. It is used to determine the amount of money that must be put away today in order to receive a certain amount of money at a specified future date. The Iowa Present Value Discount Table is based on the Iowa State Treasurer's preferred rate of return and allows for the calculation of the present value of an annuity or series of payments or receipts. There are two types of Iowa Present Value Discount Tables: the lump sum and the annuity table. The lump sum table is used to calculate the present value of a single lump sum payment or receipt to be received at a future date. The annuity table is used to calculate the present value of a series of payments or receipts that occur at regular intervals.