IRR is one of the most commonly cited numbers in private equity — and one of the most commonly misunderstood.
Here's what it actually means, how it works, and why experienced allocators don't take it at face value.
What IRR is
IRR stands for Internal Rate of Return. It's the annualized return rate that makes the net present value of all cash flows, money in and money out, equal to zero.
In plain English: it's the answer to "what annual return did this fund deliver, accounting for when money was called and when it was returned?"
The IRR Equation
0 = CF₀ + CF₁/(1+r)¹ + CF₂/(1+r)² + … + CFₙ/(1+r)ⁿ
There's no closed-form solution — IRR is found by trial and error (iteration).
A simple example
You invest $100 today. Two years later you get back $130. The IRR is roughly 14% because $100 compounded at 14% for two years gets you close to $130.
Now change the timing: same $100 in, same $130 out, but it takes five years instead of two. IRR drops to about 5.4%. The return is the same in absolute terms, but IRR penalizes you for waiting longer.
Cash Flows
Vs. Hurdle
Iterative
Why Allocators Are Skeptical
IRR has a few well-known flaws that matter a lot in private equity.
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Timing is everything. A fund that calls capital late and returns it early will show a high IRR even if the absolute gain is modest. GPs can game this.
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The reinvestment assumption. IRR implicitly assumes you can reinvest distributions at the same rate. In reality, that's rarely true — especially at high IRRs.
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Short funds look great. A fund that returns capital in two years at 1.5x shows a very high IRR. A fund that takes eight years at 3.0x may show a lower IRR — but actually made you more money.
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Subscription lines inflate it. Many GPs use credit facilities to delay capital calls, which shortens the apparent investment period and boosts IRR without changing real returns.
This is why allocators use IRR alongside DPI and TVPI — not instead of them. A 30% IRR with a 1.1x DPI after eight years tells a very different story than a 20% IRR with a 2.5x DPI.
What To Use Alongside IRR
No single metric tells the whole story. Allocators typically triangulate:
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IRR for comparing funds of similar strategy and vintage on a time-weighted basis.
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DPI to confirm real cash has been returned — not just marks.
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TVPI as the absolute multiple — how much did investors make per dollar in?
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PME (Public Market Equivalent) to benchmark PE returns against what a comparable public markets investment would have returned.
IRR is useful. It accounts for time in a way that a simple multiple doesn't. But it's also one of the most manipulable numbers in private markets. The allocators who ask the right questions, how was this calculated, were subscription lines used, how does it compare to DPI?, are the ones who don't get surprised later.
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