# Excel IRR function

## Summary

The Excel IRR function calculates the internal rate of return of an investment based upon a series of cashflows. When investments are compared to one another, a higher IRR indicates a better investment. Negative IRR results indicate poor investments that should be avoided. The IRR function is an Excel financial function.

## Function

=IRR(rate, value1, [value2], [value3], …)

## Arguments (inputs)

rate = the discount rate for a single period

values = the range of cashflows of an investment with payments/investments expressed as negative numbers and returns/income expressed as positive numbers

guess = [optional] a guess of the internal rate of return, if omitted 10% or 0.1 will be used

## Return value

The IRR function returns the internal rate of return expressed as a percentage. The higher the IRR return value, the better the investment is believed to be.

For example, an investment with an IRR of 11% is a better investment than an investment with an IRR of 8%.

## Excel IRR function example

In the example above the IRR function calculates the internal rate of return for an investment of \$5000 in 2020 (cell C8), that will result in a series of returns or payments shown in cells C9:C18. The second argument, guess which is optional, is omitted so 10% is used by Excel by default.

=IRR(C8:C18)

The result returned is 4%, which is the internal rate of return for this investment.