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# IRR Function

**Visual Studio .NET 2003**

Returns a **Double** specifying the internal rate of return for a series of periodic cash flows (payments and receipts).

Function IRR( _ ByRef ValueArray() As Double, _ Optional ByVal Guess As Double = 0.1 _ ) As Double

#### Parameters

*ValueArray*()- 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). *Guess*- Optional. Object specifying value you estimate will be returned by
**IRR**. If omitted,*Guess*is 0.1 (10 percent).

#### Exceptions/Errors

Exception type | Error number | Condition |
---|---|---|

ArgumentException | 5 | Array argument values are invalid. |

#### Remarks

The internal rate of return is the interest rate received for an investment consisting of payments and receipts that occur at regular intervals.

The **IRR** 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 cash flow for each period doesn't need to be fixed, as it is for an annuity.

**IRR** is calculated by iteration. Starting with the value of *Guess*, **IRR** cycles through the calculation until the result is accurate to within 0.00001 percent. If **IRR** can't find a result after 20 tries, it fails.

#### Example

In this example, the **IRR** function returns the internal rate of return for a series of 5 cash flows contained in the array `Values()`

. The first array element is a negative cash flow representing business start-up costs. The remaining 4 cash flows represent positive cash flows for the subsequent 4 years. `Guess`

is the estimated internal rate of return.

Sub TestIRR() Dim Guess, RetRate, Values(4) As Double Dim Fmt, Msg As String Guess = 0.1 ' Guess starts at 10 percent. Fmt = "#0.00" ' Define percentage format. Values(0) = -70000 ' Business start-up costs. ' Positive cash flows reflecting income for four successive years. Values(1) = 22000 : Values(2) = 25000 Values(3) = 28000 : Values(4) = 31000 RetRate = IRR(Values, Guess) * 100 ' Calculate internal rate. Msg = "The internal rate of return for these five cash flows is " Msg = Msg & Format(RetRate, CStr(Fmt)) & " percent." MsgBox(Msg) ' Display internal return rate. End Sub

#### Requirements

**Namespace:** **Microsoft.VisualBasic**

**Module:** **Financial**

**Assembly:** Microsoft Visual Basic .NET Runtime (in Microsoft.VisualBasic.dll)

#### See Also

DDB Function | FV Function | IPmt Function | MIRR Function | NPer Function | NPV Function | Pmt Function | PPmt Function | PV Function | Rate Function | SLN Function | SYD Function | ArgumentException Class