הפונקציה PPmt

Dim NL, TB, Fmt, FVal, PVal, APR, TotPmts, PayType, Payment, Msg, MakeChart, Period, P, I
Const ENDPERIOD = 0, BEGINPERIOD = 1    ' When payments are made.
NL = Chr(13) & Chr(10)    ' Define newline.
TB = Chr(9)    ' Define tab.
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 do you have to make?")
PayType = MsgBox("Do you make payments at the end of month?", vbYesNo)
If PayType = vbNo Then PayType = BEGINPERIOD Else PayType = ENDPERIOD
Payment = Abs(-Pmt(APR / 12, TotPmts, PVal, FVal, PayType))
Msg = "Your monthly payment is " & Format(Payment, Fmt) & ". "
Msg = Msg & "Would you like a breakdown of your principal and "
Msg = Msg & "interest per period?"
MakeChart = MsgBox(Msg, vbYesNo)    ' See if chart is desired.
If MakeChart <> vbNo Then
    If TotPmts > 12 Then MsgBox "Only first year will be shown."
    Msg = "Month  Payment  Principal  Interest" & NL
    For Period = 1 To TotPmts
        If Period > 12 Then Exit For    ' Show only first 12.
        P = PPmt(APR / 12, Period, TotPmts, -PVal, FVal, PayType)
        P = (Int((P + .005) * 100) / 100)    ' Round principal.
        I = Payment - P
        I = (Int((I + .005) * 100) / 100)    ' Round interest.
        Msg = Msg & Period & TB & Format(Payment, Fmt)
        Msg = Msg & TB & Format(P, Fmt) & TB & Format(I, Fmt) & NL
    Next Period
    MsgBox Msg    ' Display amortization table.
End If