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I have prepared projections for a proposed project, and I want to calculate the internal rate of return. Instead of using Excel's IRR function, should I use simple math formulas so others can follow my calculations? Excel offers three functions for calculating the internal rate of return, and I recommend you use all three.

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The problem with using math to calculate the internal rate of return is that the necessary calculations are both complicated and time- consuming. Basically, a math- based solution involves calculating the net present value (NPV) for each cash flow amount (in a series of cash flows) using various guessed interest rates on a trial- and- error basis, and then those NPVs are added together. This process is repeated using various interest rates until you find/stumble upon the exact interest rate that produces NPV amounts that sum to zero. The interest rate that produces a zero- sum NPV is then declared the internal rate of return.

To simplify this process, Excel offers three functions for calculating the internal rate of return, each of which represents a better option than using the math- based formulas approach. Synopsys tcad torrent. These Excel functions are IRR, XIRR, and MIRR.

Explanations and examples for these functions are presented below. You can download the example workbook at. Excel's IRR function. Excel's IRR function calculates the internal rate of return for a series of cash flows, assuming equal-size payment periods.

Using the example data shown above, the IRR formula would be =IRR(D2:D14.1)*12, which yields an internal rate of return of 12.22%. However, because some months have 31 days while others have 30 or fewer, the monthly ­periods are not exactly the same length, therefore, the IRR will always return a slightly erroneous result when multiple monthly periods are involved. Excel's XIRR function. Excel's XIRR function calculates a more accurate internal rate of return because it takes into consideration different-size time periods.

To use this function, you must supply both the cash flow amounts as well as the specific dates in which those cash flows are paid. In the example pictured below left, the XIRR formula would be =XIRR(D2:D14,B2:B14.1), which yields an internal rate of return of 12.97%. Excel's MIRR function. Excel's MIRR function (modified internal rate of return) works similarly to the IRR function, except that it also considers the cost of borrowing the initial investment funds as well as compounded interest earned by reinvesting each cash flow. The MIRR function is flexible enough to accommodate separate interest rates for borrowing and investing cash. Because the MIRR function calculates compound interest on project earnings or cash shortfalls, the resulting internal rate of return is usually significantly different from the internal rate of return produced by the IRR or XIRR function. In the example at left, the MIRR formula would be =MIRR(D2:D14,D16,D17)*12, which yields an internal rate of return of 17.68%.