This article describes the formula syntax and usage of the ISPMT function in Microsoft Excel.
Description
Calculates the interest paid during a specific period of an investment.
Syntax
ISPMT(rate, per, nper, pv)
The ISPMT function syntax has the following arguments:

Rate Required. The interest rate for the investment.

Per Required. The period for which you want to find the interest, and must be between 1 and nper.

Nper Required. The total number of payment periods for the investment.

Pv Required. The present value of the investment. For a loan, pv is the loan amount.
Remarks

Make sure that you are consistent about the units you use for specifying rate and nper. If you make monthly payments on a fouryear loan at an annual interest rate of 12 percent, use 12%/12 for rate and 4*12 for nper. If you make annual payments on the same loan, use 12% for rate and 4 for nper.

For all the arguments, the cash you pay out, such as deposits to savings or other withdrawals, is represented by negative numbers; the cash you receive, such as dividend checks and other deposits, is represented by positive numbers.

For additional information about financial functions, see the PV function.
Example
Copy the example data in the following table, and paste it in cell A1 of a new Excel worksheet. For formulas to show results, select them, press F2, and then press Enter. If you need to, you can adjust the column widths to see all the data.
Data 
Description 

0.1 
Annual interest rate 

1 
Period 

3 
Number of years in the investment 

8000000 
Amount of loan 

Formula 
Description 
Result 
=ISPMT(A2/12,A3,A4*12,A5) 
Interest paid for the first monthly payment of a loan with the above terms 
64814.8148 
=ISPMT(A2,1,A4,A5) 
Interest paid in the first year of a loan with the above terms 
533333.333 