Mastering MIRR: Unveiling the Formula and Practical Examples for Accurate Calculation

Apr 19, 2024


Mastering the Modified Internal Rate of Return (MIRR) is a crucial skill for finance professionals looking to make accurate investment decisions. This metric takes into account the cost of capital and reinvestment rate, providing a more realistic picture of an investment's profitability.

Understanding the MIRR Formula

To calculate MIRR, you need to know the initial investment, cash inflows, cash outflows, cost of capital, and reinvestment rate. The formula for MIRR involves finding the present value of all cash flows at the cost of capital, then compounding the resulting value to the end of the investment period at the reinvestment rate.

Practical Examples

Let's consider a simple example to illustrate the calculation of MIRR. Suppose you invest $10,000 in a project with cash inflows of $4,000 in year 1, $5,000 in year 2, and $8,000 in year 3. The cost of capital is 8%, and the reinvestment rate is 6%.

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Calculating MIRR Step by Step

1. Calculate the future value of all positive cash flows at the reinvestment rate. In our example, this would be $4,000 * (1 + 0.06)^2 + $5,000 * (1 + 0.06) + $8,000.

2. Find the future value of the initial investment at the cost of capital. In this case, it would be $10,000 * (1 + 0.08)^3.

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Interpreting the MIRR Result

After performing the calculations, you would find the MIRR for the investment. A value greater than the cost of capital indicates a profitable investment, while a value lower than the cost of capital suggests a loss-making venture.

Benefits of Using MIRR

MIRR offers a more accurate representation of an investment's true return compared to other metrics like IRR. By considering both the cost of capital and reinvestment rate, MIRR provides a comprehensive analysis of an investment's viability.


Mastering the MIRR formula is essential for investors and financial analysts seeking to make informed decisions about potential investments. By understanding how to calculate MIRR and interpret the results, you can evaluate investment opportunities more effectively.