IPmt

The IPmt function returns the interest portion of a periodic, constant payment for an investment or loan with a constant interest rate.

To determine the total payment, or how much is allocated to principal, use the Pmt and PPmt functions.

Syntax

IPmt(rate, period, nperiods, pv, [fv], [type])

The IPmt function has the following arguments:

rate	(required) The interest rate for the loan.
period	Current payment period.The valid range is 1 through nperiods.
nperiods	The total number of payments for the loan.
pv	Required. The present value, or total value of all loan payments; the amount borrowed.
fv	(Optional) The future value, or a cash balance you want after the last payment is made. Defaults to 0 (zero).
type	(Optional) When payments are due: 0 End of period 1 Beginning of period Default is 0.

Notes

• Be consistent with the units for rate and nperiods arguments. If you make monthly payments on a two-year loan at an annual interest rate of 7%, use the rate calculation of 0.07/12 and nperiods calculation of 2*12. For annual payments on the same loan, use the rate of 0.07 and nperiods of 2.

Examples

IPmt(.07/12,1,2*12,10000)
IPmt(.07/12,2*12,2*12,10000)

The first monthly interest payment for a loan of $10,000, with an annual interest rate of 7% is $58.33. The last (24th) interest payment is $2.60.

IPmt(.07,1,2,10000)
IPmt(.07,2,2,10000)

The first year's interest payment for a two-year loan of $10,000, with an annual interest rate of 7% is $700.00. The last payment (second year) has the interest payment of $361.84.

The first yearly payment for a loan of $100,000, with an annual interest rate of 10% over 30 years, compounded yearly, has the interest payment of $10,000.00. The last payment (year 30) has the interest payment of $964.36.