Internal rate of return
What is Internal rate of return?
Internal rate of return is the discount rate that makes the present value of an investment's dated cash inflows equal the present value of its dated cash outflows.
Why IRR matters
IRR summarizes a sequence of investments, distributions, and ending value as one annualized money-weighted rate. It is widely used for private markets, projects, and investor-specific returns because the size and timing of cash flows affect the result. This sensitivity is useful when the investor or manager controls timing, but it complicates comparisons with time-weighted market returns.
How it is calculated
The calculation solves for the rate at which the net present value of all dated cash flows equals zero. Contributions are normally negative from the investor's perspective, while distributions and residual value are positive. XIRR-style calculations use actual dates. Numerical methods are required because there is usually no simple algebraic solution.
Example
An investor contributes $100, receives $20 after one year, and receives $110 after two years. IRR is the annual rate that discounts the two inflows back to the original $100. It differs from a return calculated only from total cash received because the earlier $20 distribution has greater present value.
How to interpret it
Confirm cash-flow signs, dates, residual valuation, currency, fees, and whether the rate is gross or net. Compare private investments of the same vintage and strategy with complementary multiples such as MOIC, TVPI, and DPI. A high early distribution can raise IRR even when the total profit is modest, so magnitude and timing should be assessed together.
Limitations
Unconventional cash-flow patterns can produce multiple IRRs or no economically meaningful solution. The metric embeds a reinvestment interpretation and can favor projects that return capital quickly. It is sensitive to interim valuations and subscription-credit facilities. IRR should not be directly compared with time-weighted return without explaining their different questions and cash-flow sensitivities.
Practical checklist
Validate every dated cash flow and residual value, use a consistent investor perspective, and test for multiple sign changes and solutions. Report net and gross rates with the bridge between them. Pair IRR with invested-capital multiples, public-market equivalents, and cash-flow schedules. Explain valuation policy and the effect of financing, and never present an undated spreadsheet IRR as fully equivalent to date-aware XIRR.
Also known as: IRR
Sources and further reading
- GIPS Standards Handbook for Firms, Global Investment Performance Standards