The Multiple Expansion Subsidy

This paper answers a question the industry rarely asks of itself: when a fund's historical returns are cited as evidence that its underwriting discipline works, is that claim actually true — or is it a claim about market conditions dressed up as a claim about process?

The decision it should improve is how Managing Partners and Investment Committees evaluate their own underwriting discipline going forward, separate from how their historical returns have performed. The boardroom conversation it should change is the assumption that a strong track record is sufficient evidence that current underwriting practices remain adequate.

The executive habit it should challenge is citing past fund performance as validation of present-day process quality, without asking what market condition that performance depended on. It is worth ten minutes of attention because it explains, precisely, why a gap that has existed for over a decade has suddenly become financially consequential — and it should be saved and referenced because it supplies the causal mechanism behind every future conversation in this pillar about why now, not just what.

For most of the last decade, private equity underwrote margin improvement with real analytical discipline and almost no verification during the hold — and it rarely mattered, because rising exit multiples quietly absorbed the difference between what was modeled and what was actually delivered.

That absorption was never a feature of a sound process. It was a market condition mistaken for one. Bain's own 2026 research finds that nearly eighty percent of GPs now expect purchase multiples to hold at current levels rather than expand further. The subsidy that made an unverified margin assumption survivable for over a decade has ended.

Nothing about the underwriting practice itself has changed. Only the environment protecting it has — and every fund still relying on that environment is carrying risk that used to be invisible and now isn't.

Track record is the most persuasive form of evidence available in this industry. A fund that has delivered acceptable returns across multiple vintages is treated, reasonably, as evidence that its underwriting process — including how it handles margin assumptions — is sound. Intelligent Managing Partners have relied on this inference for years, and it has rarely been wrong in a way anyone noticed, because the returns themselves were real.

This belief persisted because the two claims — "our returns have been good" and "our process is sound" — were never forced apart. As long as the market kept expanding multiples, a soft margin assumption still produced an acceptable outcome, and the underlying process was never independently tested against a less forgiving environment. The absence of failure was treated as proof of quality, when it may have only been proof of favorable timing.

Bain and StepStone's 2026 Global Private Equity Report finds that approximately eighty percent of GPs now expect purchase price multiples to hold at their current, already-elevated levels rather than continue expanding.

This is the same source that, in the same report, confirmed the underwriting-verification gap addressed in this pillar's foundational paper. Read together, the two findings describe a single mechanism: the industry has long tolerated an unverified margin assumption inside its underwriting models, and for most of the last decade, multiple expansion quietly covered the cost of that tolerance.

That coverage has ended. The gap did not widen. The condition that made the gap survivable disappeared.

Enterprise value: value built on an unverified margin assumption was previously protected by a rising denominator — the exit multiple. It is no longer protected by anything, meaning enterprise value increasingly reflects the true, untested state of the underlying improvement claim.

Exit multiple: this is the central mechanism. For over a decade, the exit multiple functioned as an informal insurance policy against underwriting shortfall. That policy has lapsed, and any fund still pricing risk as though it remains in force is exposed without knowing it.

DPI: as multiples plateau, exits that once closed cleanly on the strength of a rising market now depend more heavily on the underlying operating story holding up on its own — contributing further pressure to an already-suppressed distribution environment.

Capital allocation: continuing to underwrite deals as though multiple expansion remains available is, functionally, an allocation decision made against a return assumption with no structural support behind it.

Governance quality: boards and Investment Committees that cite historical fund performance as evidence of process quality are, in many cases, citing evidence of market conditions instead — a distinction current governance practice rarely makes explicit.

An experienced Operating Partner recognizes a distinction deal teams and boards frequently miss: the difference between a return that was earned and a return that was protected.

Both can look identical in a fund's reported performance. What actually determines forward risk is not whether the fund performed well historically, but whether its underwriting process has ever been tested under conditions that don't forgive a soft assumption.

Most current processes have not been — not because anyone avoided the test deliberately, but because the market simply never required it.

The differentiated observation is this: a decade of acceptable returns during an expanding-multiple environment tells you almost nothing about whether a fund's underwriting discipline will hold up in a flat one.

The two environments are, in effect, different tests — and only one of them has actually been taken.

Sellers today frequently present their historical track record as implicit assurance that their current underwriting is sound. Buyers, particularly those who have also internalized the plateau in multiple expansion, are increasingly skeptical of that inference — because they, too, can no longer count on a rising multiple to make an overpayment forgivable later.

Confidence increases when a seller can demonstrate that a margin thesis holds independent of any assumed further multiple expansion — that the valuation clears on operating merit alone.

Confidence weakens when the seller's implicit support for the valuation is a historical track record built substantially inside a different, more forgiving market environment.

The question few sellers can currently answer with confidence: if multiples do not move from here, does this valuation still make sense on its own terms?

This paper does not introduce a new ownership analysis — it strengthens the one already established in the foundational Underwriting-Realization Gap paper by explaining why the absence of ownership has become newly expensive.

Information, authority, incentive, and accountability remain fragmented across deal teams, management, and the fund as a whole, exactly as previously mapped. What has changed is the cost of that fragmentation: a structural gap that used to be economically invisible, because the market absorbed it, is now fully exposed and unabsorbed.

A brief diagnostic for evaluating whether a fund's historical performance reflects process quality or market conditions:

This is a directional diagnostic, not a precision audit — its purpose is to force the separation between two claims the industry has long treated as one.

Managing Partners should apply the Subsidy Test to their own fund's history before citing track record as unqualified evidence of process discipline to LPs or Investment Committees.

Investment Committees should require current underwriting models to clear target returns without assuming further multiple expansion — a stress test that, per this research, a meaningful share of the industry's models may not currently pass.

CFOs should distinguish, in internal fund reporting, between realized returns attributable to operating improvement and returns attributable to multiple movement, rather than reporting a single blended figure.

Boards should ask whether the firm's confidence in its own underwriting discipline has ever been tested under a flat-multiple assumption, or only validated by outcomes that occurred during an expanding one.

None of this is a tactical fix. It is a governance recalibration: recognizing that the market's past generosity is not a credential the firm has actually earned.

"The market didn't create this problem. It just stopped paying for it."

The page that belongs in the next board packet is the Subsidy Test, applied to the fund's three or four largest historical exits.

The question that should appear in the next Investment Committee strategy session: does our current underwriting, stress-tested at a flat exit multiple, still clear our target return?

The assumption that should be re-examined: that historical fund performance, on its own, validates the adequacy of current underwriting discipline.

This paper supplies the causal mechanism the foundational Underwriting-Realization Gap paper implies but does not fully explain: why a long-tolerated verification gap has become newly consequential.

It introduces the Subsidy Test as a second concrete diagnostic tool in the pillar, distinct from but complementary to the Underwriting-Realization Test — the first examines whether a specific margin assumption is verified; this one examines whether a fund's broader track record has ever been tested without market assistance.

Future research on exit multiple compression and fund-level track record durability should build on this paper's distinction between earned and protected returns.