IRR on Microsoft Excel We will use the same example we used above. Open Excel and enter -100 (that is negative 100) in cell A1, 0 (that is zero) in A2 and 132.25 in A3.

Next, in the IRR function, in the Values field, select the array of cells that contains the values of the payments and receipts for which you want to calculate the IRR. In our example, it is A1:A13.