This example returns the payment for a loan over a fixed period. Given are the interest percentage rate per period (APR / 12), the total number of payments (TotPmts), the present value or principal of the loan (PVal), the future value of the loan (FVal), and a number that indicates whether the payment is due at the beginning or end of the payment period (PayType).
Const ENDPERIOD = 0, BEGINPERIOD = 1 ' When payments are made.
Const MB_YESNO = 4 ' Define Yes/No buttons.
Const ID_NO = 7 ' Define No as a response.
Fmt = "###,###,##0.00" ' Define money format.
FVal = 0 ' Usually 0 for a loan.
PVal = InputBox("How much do you want to borrow?")
APR = InputBox("What is the annual percentage rate of your loan?")
If APR > 1 Then APR = APR / 100 ' Ensure proper form.
TotPmts = InputBox("How many monthly payments will you make?")
PayType = MsgBox("Do you make payments at the end of month?", MB_YESNO)
If PayType = ID_NO Then PayType = BEGINPERIOD Else PayType = ENDPERIOD
Payment = Pmt(APR / 12, TotPmts, -PVal, FVal, PayType)
MsgBox "Your payment will be " & Format(Payment, Fmt) & " per month."