While the IRR can be a useful tool for analyzing potential investments, it has limitations and can lead investors astray if not paired with other financial metrics.
1. Overemphasis on Time
The IRR heavily values the timing of cash flows. The sooner the cash flows are received, the higher the IRR will be. This means that investments with early returns can have high IRRs even if their total returns are not impressive. Investors focused on long-term wealth may be misled by a high IRR.
2. Ignoring the Size of Returns
The IRR does not take into account the total return or the size of the investment. It's possible for a small investment with a high IRR to yield less overall profit than a larger investment with a lower IRR. Therefore, comparing investments based on IRR alone could lead to incorrect conclusions.
3. Assumption of Reinvestment Rate
The IRR assumes that the cash flows can be reinvested at the same rate, which is often not the case in the real world. Especially in periods of fluctuating interest rates, this assumption can lead to overstated returns.
4. Multiple IRRs
In some cases, such as when an investment has alternating periods of positive and negative cash flows, there may be multiple IRRs. This can cause confusion and potentially lead to a misinterpretation of the investment’s profitability.