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Financial.PPmt Method

Returns a Double specifying the principal payment for a given period of an annuity based on periodic fixed payments and a fixed interest rate.

Namespace:  Microsoft.VisualBasic
Assembly:  Microsoft.VisualBasic (in Microsoft.VisualBasic.dll)

public static double PPmt(
	double Rate,
	double Per,
	double NPer,
	double PV,
	double FV,
	DueDate Due
)

Parameters

Rate
Type: System.Double

Required. Double specifies the interest rate per period. For example, if you get a car loan at an annual percentage rate (APR) of 10 percent and make monthly payments, the rate per period is 0.1/12, or 0.0083.

Per
Type: System.Double

Required. Double specifies the payment period in the range 1 through NPer.

NPer
Type: System.Double

Required. Double specifies the total number of payment periods in the annuity. For example, if you make monthly payments on a four-year car loan, your loan has a total of 4 x 12 (or 48) payment periods.

PV
Type: System.Double

Required. Double specifies the current value of a series of future payments or receipts. For example, when you borrow money to buy a car, the loan amount is the present value to the lender of the monthly car payments you will make.

FV
Type: System.Double

Optional. Double specifying future value or cash balance you want after you have made the final payment. For example, the future value of a loan is $0 because that is its value after the final payment. However, if you want to save $50,000 over 18 years for your child's education, then $50,000 is the future value. If omitted, 0 is assumed.

Due
Type: Microsoft.VisualBasic.DueDate

Optional. Object of type DueDate that specifies when payments are due. This argument must be either DueDate.EndOfPeriod if payments are due at the end of the payment period, or DueDate.BegOfPeriod if payments are due at the beginning of the period. If omitted, DueDate.EndOfPeriod is assumed.

Return Value

Type: System.Double
Returns a Double specifying the principal payment for a given period of an annuity based on periodic fixed payments and a fixed interest rate.

ExceptionCondition
ArgumentException

Per <=0 or Per > NPer.

An annuity is a series of fixed cash payments made over a period of time. An annuity can be a loan (such as a home mortgage) or an investment (such as a monthly savings plan).

The Rate and NPer arguments must be calculated using payment periods expressed in the same units. For example, if Rate is calculated using months, NPer must also be calculated using months.

For all arguments, cash paid (such as deposits to savings) is represented by negative numbers; cash received (such as dividend checks) is represented by positive numbers.

This example uses the PPmt function to calculate how much of a payment for a specific period is principal when all the payments are of equal value. Given are the interest percentage rate per period (APR / 12), the payment period for which the principal portion is desired (Period), 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).

Sub TestPPMT()
    Dim PVal, APR, TotPmts, Payment, Period, P, I As Double 
    Dim PayType As DueDate
    Dim Msg As String 
    Dim Response As MsgBoxResult

    ' Define money format. 
    Dim Fmt As String = "###,###,##0.00" 
    ' Usually 0 for a loan. 
    Dim Fval As Double = 0
    PVal = CDbl(InputBox("How much do you want to borrow?"))
    APR = CDbl(InputBox("What is the annual percentage rate of your loan?"))
    ' Ensure proper form. 
    If APR > 1 Then APR = APR / 100
    TotPmts = CDbl(InputBox("How many monthly payments do you have to make?"))
    Response = MsgBox("Do you make payments at the end of month?", MsgBoxStyle.YesNo)
    If Response = MsgBoxResult.No Then
        PayType = DueDate.BegOfPeriod
    Else
        PayType = DueDate.EndOfPeriod
    End If
    Payment = Math.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?" 
    ' See if chart is desired. 
    Response = MsgBox(Msg, MsgBoxStyle.YesNo)
    If Response <> MsgBoxResult.No Then 
        If TotPmts > 12 Then MsgBox("Only first year will be shown.")
        Msg = "Month  Payment  Principal  Interest" & vbNewLine
        For Period = 1 To TotPmts
            ' Show only first 12. 
            If Period > 12 Then Exit For
            P = PPmt(APR / 12, Period, TotPmts, -PVal, FVal, PayType)
            ' Round principal.
            P = (Int((P + 0.005) * 100) / 100)
            I = Payment - P
            ' Round interest.
            I = (Int((I + 0.005) * 100) / 100)
            Msg = Msg & Period & vbTab & Format(Payment, Fmt)
            Msg = Msg & vbTab & Format(P, Fmt) & vbTab & Format(I, Fmt) & vbNewLine
        Next Period
        ' Display amortization table.
        MsgBox(Msg)
    End If 
End Sub

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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