# Financial.NPV(Double, Double[]) Method

## Definition

Returns a value specifying the net present value of an investment based on a series of periodic cash flows (payments and receipts) and a discount rate.

``````public:
static double NPV(double Rate, cli::array <double> ^ % ValueArray);``````
``public static double NPV (double Rate, ref double[] ValueArray);``
``static member NPV : double * Double[] -> double``
``Public Function NPV (Rate As Double, ByRef ValueArray As Double()) As Double``

#### Parameters

Rate
Double

Required. The discount rate over the length of the period, expressed as a decimal.

ValueArray
Double[]

Required. Array of `Double` specifying cash flow values. The array must contain at least one negative value (a payment) and one positive value (a receipt).

#### Returns

The net present value of an investment based on a series of periodic cash flows (payments and receipts) and a discount rate.

#### Exceptions

`ValueArray` is `Nothing`, rank of `ValueArray` <> 1, or `Rate` = -1

## Examples

This example uses the `NPV` function to return the net present value for a series of cash flows contained in the array `values()`. The return value, stored in `FixedRetRate`, represents the fixed internal rate of return.

``````' Define money format.
Dim MoneyFmt As String = "###,##0.00"
' Define percentage format.
Dim PercentFmt As String = "#0.00"

Dim values(4) As Double
values(0) = -70000
' Positive cash flows reflecting income for four successive years.
values(1) = 22000
values(2) = 25000
values(3) = 28000
values(4) = 31000

' Use the NPV function to calculate the net present value.
' Set fixed internal rate.
Dim FixedRetRate As Double = 0.0625
' Calculate net present value.
Dim NetPVal As Double = NPV(FixedRetRate, values)
' Display net present value.
MsgBox("The net present value of these cash flows is " &
Format(NetPVal, MoneyFmt) & ".")
``````

## Remarks

The net present value of an investment is the current value of a future series of payments and receipts.

The `NPV` function uses the order of values within the array to interpret the order of payments and receipts. Be sure to enter your payment and receipt values in the correct sequence.

The `NPV` investment begins one period before the date of the first cash flow value and ends with the last cash flow value in the array.

The net present value calculation is based on future cash flows. If your first cash flow occurs at the beginning of the first period, the first value must be added to the value returned by `NPV` and must not be included in the cash flow values of `ValueArray`.

The `NPV` function is similar to the `PV` function (present value) except that the `PV` function allows cash flows to begin either at the end or the beginning of a period. Unlike the variable `NPV` cash flow values, `PV` cash flows must be fixed throughout the investment.