The modified internal rate of return (MIRR) is basically same as the internal rate of return (IRR) for a project except for one factor. IRR assumes the cash flow from an investment or project to be reinvested
at the IRR, whereas MIRR assumes that all cash flows to be reinvested at the investor’s or
firm’s cost of
capital. With this reason, the MIRR is said to reflect the profitability of a project or investment more realistically than an IRR.The modified internal rate of return is the discount rate that equates the present value of the project’s cash outflows with the present value of the project’s terminal value, where the terminal value is defined as the sum of the future value of the project’s free cash flows compounded to the project’s termination at the project’s required rate of return
. Same with IRR, the project would be accepted if the MIRR is greater than or equal to the required rate of return and the project would be rejected if the MIRR is less than the required rate of return