Internal rate of return (IRR) is the single most cited performance metric in private equity and venture capital. It is the annualized discount rate that makes the net present value of all cash inflows and outflows from an investment equal to zero. In plain terms, IRR answers: “What annualized return did this fund actually generate, accounting for when money went in and when it came back?”
How IRR Works
Every fund has a series of cash flows. Capital calls pull money from LPs at irregular intervals. Distributions send money back, also at irregular intervals. IRR finds the single annual rate that, when used to discount all of those cash flows back to a common date, nets them to zero.
This time-weighting is what makes IRR powerful. A fund that doubles your money in three years is fundamentally different from one that doubles it in eight, even though both show a 2.0x money multiple. IRR captures that difference.
Why IRR Matters to LPs and GPs
For limited partners, IRR is the primary tool for comparing fund performance across managers, strategies, and vintage years. Institutional allocators benchmark fund IRRs against public market indices and peer groups using data from providers like Cambridge Associates, Preqin, and Burgiss.
For general partners, IRR directly affects economics. Most carried interest waterfalls use a preferred return (typically 8%) expressed as an IRR threshold. The GP does not earn carry until LP returns clear that hurdle on an IRR basis.
The Limitations
IRR has well-documented weaknesses that every practitioner should understand:
- Timing sensitivity. Early returns disproportionately boost IRR. A quick 3x exit in year one can mask mediocre performance across the rest of the portfolio.
- Subscription line distortion. Funds that use credit facilities to delay capital calls mechanically inflate IRR by shortening the period LPs’ capital is technically at work. Preqin has noted that subscription lines can add 200-400 basis points to reported IRR.
- Reinvestment assumption. The math behind IRR implicitly assumes interim cash flows are reinvested at the IRR itself, which is unrealistic for high-returning funds.
- Multiple solutions. When cash flows alternate between positive and negative multiple times, the IRR equation can produce more than one mathematical solution.
IRR in Context
Sophisticated investors never evaluate IRR in isolation. They pair it with MOIC to separate magnitude from timing, with DPI to see how much has actually been returned in cash, and with PME to benchmark against public alternatives. The most complete picture comes from viewing all four together.
A fund showing a 30% IRR with a 1.3x MOIC likely achieved one early exit and is still largely unrealized. A fund with a 15% IRR and a 2.5x MOIC probably deployed patient capital over a longer hold period. Neither number alone tells the full story.
Frequently Asked Questions
What is a good IRR in private equity?
Top-quartile buyout funds historically target net IRRs above 20%, according to Cambridge Associates benchmark data. Venture capital shows wider dispersion, with top-quartile funds often exceeding 25% net IRR while median funds may land in the low teens. What counts as 'good' depends on strategy, vintage year, and the rate environment.
How is IRR different from MOIC?
IRR measures the annualized rate of return and accounts for the timing of cash flows. MOIC (multiple on invested capital) measures total return as a simple multiple of money invested, ignoring time. A fund that returns 2x in three years has a higher IRR than one that returns 2x in seven years, even though both have identical MOICs.
Can IRR be manipulated?
Yes. Because IRR is sensitive to timing, GPs can inflate it by using subscription credit facilities to delay capital calls, returning capital early from quick exits, or cherry-picking early winners. This is why sophisticated LPs evaluate IRR alongside MOIC, DPI, and PME rather than relying on any single metric.
