PMT and What if analysis PMT The Microsoft Excel PMT function returns the payment amount for a loan based on an interest rate and a constant payment schedule. The syntax for the Microsoft Excel PMT function is: PMT( interest_rate, number_payments, PV, [FV], [Type] ) Conti.. interest_rate = Rate, divided by 12(number of months). number_payments = NPER, multiply it with 12. PV = Loan Amount = total amount. Calculating a Loan Payment The functions to work with loans are the same ones you used to work with investments New Perspectives on Microsoft Office Excel Working with What-If Analysis and Goal Seek To perform what-if analysis: Change the value of a worksheet cell (the input cell) Observe its impact on one or more calculated cells (the result cells) To perform Goal Seek: In the Data Tools group on the Data tab, click the What-If Analysis button, and then click Goal Seek In the Set cell box, select the result cell, and then, in the To value box, specify its value (goal) In the By changing cell box, specify the input cell Click the OK button. The value of the input cell changes to set the value of the result cell