What Is IRR (Internal Rate of Return)?
Learn how the internal rate of return measures an investment's annualised profitability, accounting for the timing and magnitude of all cash flows.
Key Takeaways
- IRR is the discount rate at which the net present value of all cash flows from an investment equals zero.
- It accounts for both the size and timing of cash flows, providing an annualised return measure.
- IRR is widely used in private equity, venture capital, and project finance to evaluate and compare investments.
What IRR Means
The internal rate of return is the annualised rate of return that makes the net present value of all cash flows, both inflows and outflows, equal to zero. In simpler terms, it is the rate at which an investment breaks even on a present value basis. IRR captures both the magnitude and timing of returns, rewarding investments that generate cash earlier. It is the standard performance metric used across private equity, venture capital, and infrastructure investment globally.
How IRR Is Calculated
IRR is found by solving for the discount rate in the net present value equation where NPV equals zero. This typically requires iterative calculation or financial software, as there is no closed-form solution. For example, if an investor puts in $100,000 and receives $150,000 back after two years, the IRR is approximately 22.5%. Spreadsheet functions like XIRR handle irregular cash flow timing, which is common in private equity distributions.
Why Timing Matters
IRR is heavily influenced by when cash flows occur. An investment returning $200,000 in year one on a $100,000 investment has a much higher IRR than one returning the same amount in year five, even though the total profit is identical. This time-sensitivity makes IRR particularly relevant for comparing investments with different holding periods. African PE managers often optimise for IRR by structuring early dividend recapitalisations where possible.
Limitations of IRR
IRR assumes that interim cash flows can be reinvested at the same rate, which is often unrealistic for high-return investments. It can also produce multiple solutions when cash flows alternate between positive and negative. Additionally, IRR favours shorter-duration investments and smaller deals, which may not reflect total value creation. Investors often use IRR alongside multiple of invested capital (MOIC) to get a complete picture of performance.