Why is the PE hurdle usually expressed as an IRR rather than a simple return?

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AcadiFi · Accepted Answer

Private equity hurdle rates are expressed as IRRs because capital flows into and out of PE funds on irregular schedules over 5-10 years.

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Consider Heliostead Partners with an 8% preferred IRR. LPs commit $500M over a 5-year investment period — capital calls happen as deals close. First call is $60M in Year 1, another $90M in Year 2, and so on. Exits start in Year 4 and continue through Year 10.

The preferred return isn't 'return LPs 8% of $500M per year.' It's: the cumulative IRR on all cash flows to and from LPs must equal 8% before GP carry begins. This is equivalent to saying each dollar of called capital earns 8% compounded from its call date until its distribution date.

A simple illustration: $60M called at T=0, returned at T=4 years. For this tranche to satisfy 8% IRR, the LP must receive $60M × 1.08^4 = $81.6M (principal plus accumulated preferred) before GP can take carry on that capital.

Why this matters for LPs:
- Capital is only 'on the clock' from call date, not commitment date
- Undrawn commitments don't earn preferred return
- Earlier distributions improve LP IRR faster than later ones
- A fund that calls capital slowly and distributes early looks better on IRR even if MOIC is identical

GPs sometimes 'game' preferred IRR by accelerating exits or via NAV lines (credit facilities that delay capital calls). Sophisticated LPs look at both IRR and multiple-on-invested-capital (MOIC or TVPI) to avoid being misled by timing effects.

Why is the PE hurdle usually expressed as an IRR rather than a simple return?

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