IPmt

IPmt(rate,per,nper,pv,fv,type)

Returns the interest portion of a payment received on an annuity, assuming constant periodic payments and a fixed interest rate.

Parameters:

 Rate: The interest rate per period.
 Per:  The period to compute the principal payment for. {1..NPer}
 NPer: The total number of periods in the annity's lifetime.
 Pv:   The present value. If you receive a loan, this is the
       loan amount as a positive number.  If you give someone
       a loan, this is a negative number.
 Fv:   (Optional) Future value of annuity at the end of the NPer
       periods.  If you receive a loan, this is your final balloon
       payment at the end as a negative number.  If you get money
       back at the end, this is a positive number.
 Type: (Optional) Indicates whether payments are at the beginning of the
       period.
       True  = Payments due at beginning of period, with first payment 
               due immediately.
       False = Payments due at end of period. (default)

Library

Financial Functions

Examples

You have a 30-year fixed-rate mortgage at 6.5% on an initial loan amount of $350K. You have held the mortgage for 5 years -- your next payment will be the 60th payment. How much of your current monthly payment goes towards interest?

-IPmt(6.5%/12,60, 30*12,$350K) → $1777.07

As a percent of the monthly payment:

IPmt(6.5%/12,60,30*12,$350K) / Pmt(6.5%/12,30*12,$350K) → 80%

See Also

• PPmt, Pmt
• CumIPmt
• Rate, NPer, Pv