What Is IRR (Internal Rate of Return)?
Internal Rate of Return (IRR) is the discount rate that makes the net present value (NPV) of all cash flows from an investment equal to zero. In simpler terms, it is the annualized rate of return that an investment is expected to generate. IRR accounts for both the magnitude and timing of cash flows, making it more sophisticated than simple ROI.
IRR is the standard metric for evaluating capital investments, real estate deals, private equity, and any investment with multiple cash flows over time. An investment is generally considered attractive when its IRR exceeds the investor's required rate of return (hurdle rate).
If IRR > Hurdle Rate: Accept the investment. If IRR < Hurdle Rate: Reject the investment. A typical hurdle rate for businesses is 10-15%. For private equity, 20-25% IRR is often the minimum target.
IRR Concept and Approximation
- 1Total Cash Returned = ($28,000 × 5) + $20,000 = $160,000
- 2Simple ROI = ($160,000 - $100,000) / $100,000 = 60%
- 3Payback Period = $100,000 / $28,000 = 3.6 years
- 4Profit Multiple = $160,000 / $100,000 = 1.6x
- 5Estimated IRR ≈ 16-18% (iterative calculation needed for exact)
IRR Benchmarks by Investment Type
| Investment Type | Target IRR | Minimum IRR | Risk Level |
|---|---|---|---|
| Public Stocks (Passive) | 8-12% | 7% | Moderate |
| Real Estate (Rental) | 10-18% | 8% | Moderate-High |
| Real Estate (Development) | 18-25% | 15% | High |
| Private Equity | 20-30% | 15% | High |
| Venture Capital | 25-40% | 20% | Very High |
| Small Business Acquisition | 20-35% | 15% | High |
How to Evaluate an Investment Using IRR
- IRR assumes cash flows are reinvested at the IRR itself (which may be unrealistic for very high IRRs)
- Modified IRR (MIRR) addresses this by assuming reinvestment at the cost of capital
- Multiple IRRs can exist when cash flows change sign more than once
- IRR does not account for project size: a smaller project with higher IRR may create less total value
- Use IRR alongside NPV for complete investment analysis
IRR has known limitations: it assumes reinvestment at the IRR rate, does not reflect project scale, and can produce multiple solutions for non-conventional cash flows. Always use IRR in conjunction with NPV (Net Present Value) and payback period for well-rounded investment analysis.