# Documentation/Calc Functions/IPMT

IPMT

## Category:

Financial Analysis

## Summary:

Calculates the periodic amortizement for investment with regular payments and a constant interest rate.

## Syntax:

IPMT(Rate; Period; NPer; PV [; FV[; Type]])

## Returns:

Returns a real number (in currency units) which is the amount of an annuity payment going towards interest for the given parameters.

## Arguments:

Rate is a real number (expressed as a percentage or fraction) or a reference to the cell containing that number which is the periodic interest rate.

Period is a positive whole number or a reference to the cell containing that number which is the period, for which the compound interest is calculated. Period=Nper if compound interest for the last period is calculated. It must be greater than or equal to 1.

NPer is a positive real number or a reference to the cell containing that number which is the total number of periods, during which annuity is paid. Nper can also be a non-integer value. It must be greater than or equal to 1. (payment period)

PV is a real number or a reference to the cell containing that number which is the present cash value in a sequence of payments.

FV is a real number or a reference to the cell containing that number which is the desired value (future value) at the end of the periods. If it is omitted, then the function uses 0.

Type is the due date of the payment at the beginning or end of each period. If it is omitted, then the function uses 0.

Type Maturity Date
0 due at the end
1 due at the beginning
• If NPer is not an integer value then the it is truncated to an integer.
• If after truncation NPer is not greater than or equal to 1 then the function will return an error value.
• If Period is not a positive whole number then the function returns an error vaue.
• If Type is anything accept 0 or 1, then the function returns an error value.
• If Period is greater than NPer then the function returns an error value.

None

## Examples:

Formula Description Returns
=IPMT(5%;5;7;15000;20000;1) The function calculates the interest rate during the fifth period (year) if the constant interest rate is 5% and the cash value is 15,000 currency units. The periodic payment is seven years and future value as 20000 and Type as 1 (due at the beginning). 168.00 (currency units)
=IPMT(5%;5;7;15000) The function calculates the interest rate during the fifth period (year) if the constant interest rate is 5% and the cash value is 15,000 currency units. The periodic payment is seven years and future value and Type are 0 by default. -352.97 (currency units)
=IPMT(0.05;7;5;15000) The function returns an error value since Period is greater than NPer. Err:502

IPMT