Calculates the internal rate of return of a series of irregular cash flows.


XIRR(payments, dates, guess)

payments is a range containing the payments made or received, at irregular intervals.
dates is a range containing dates on which the payments were made or received.
guess (optional, defaults to 10%) is a first guess at the rate.

XIRR iterates to find the rate of return which gives a zero net present value for the cash flows. At least one of the cash flows must be negative and at least one positive - to allow the net present value to be zero. The rate of return is per annum, and interest is assumed compounded annually, with a year assumed to be 365 days long. Specifically, the equation solved is:

The order in which the payments/dates are stated is not important, except that the first payment given must have the earliest date.


XIRR(A1:A4, B1:B4)
where A1:A4 contain -2750, 1000, 2000, and B1:B4 contain dates "2008-02-05", "2008-07-05", "2009-01-05" returns approximately 0.124, or 12.4%. The dates once entered into B1:B4 will display as set in the current locale.

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