ipmt: Interest portion of annuity payment

In jla-data/TVM: Fifty Shades of Cash Flow Discounting

Interest portion of annuity payment

Description

Calculation of annuity interest.

Usage

ipmt(irate, per, nper, pv, fv = 0, type = "immediate", silent = FALSE)

Arguments

irate	Interest rate per period (see nper) as fraction (i.e. 5% is .05 or 1/20)
per	period of interest
nper	Number of interest periods as integer (no fractions)
pv	Present value
fv	Future value (default is zero)
type	type of the annuity: due or immediate?
silent	Should warning messages be suppressed? Default is no.

Value

interest on annuity

Source

builds heavily on https://gist.github.com/raadk/dcd503815bbb271484ff

Examples

ipmt(.1, 1, 1, -1000) # a single period at 10\% interest >> interest = 1/10 of principal

ipmt(.1, 1:5, 5, -1000) # see five payments of five; the amount of interest goes down

jla-data/TVM documentation built on Feb. 3, 2024, 8:48 p.m.