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M&A Buyer Uses DCF to Challenge a Seller's Management Case Projections

Case Study • — • 4 min read

Audience
Corporate Development Teams • Investment Committees
Last Reviewed
—
Updated
Version 1.0

Executive Summary

This is an illustrative, composite scenario, not a specific real transaction. It follows a prospective buyer during diligence on an acquisition target, building an independent DCF from its own, more conservative buyer-case assumptions to stress-test the seller's management-case projections. The exercise surfaces a material, unreconciled gap between the seller's growth and margin assumptions and what the buyer's independent build could support, prompting a structured challenge process rather than an acceptance of the management case at face value. The core lesson: an independent DCF built from the buyer's own assumptions is a diligence tool in its own right, not merely a formality performed after the seller's numbers have already been accepted.

Illustrative Scenario

This case study is a composite, educational scenario built from patterns commonly observed in financial model reviews. It does not describe a specific, identifiable client engagement, and any resemblance to a particular transaction is coincidental.

Background

A prospective buyer was conducting diligence on an acquisition target, having received the seller's management case financial projections as part of the data room materials. Rather than relying solely on the seller's own DCF built from those projections, the buyer's corporate development team constructed an independent DCF using its own, more conservative buyer-case assumptions for revenue growth, margin trajectory, and working capital, consistent with the diligence approach described in the DCF Valuation pillar.

The Problem

When the buyer's independent DCF was compared against the seller's management-case valuation, the two diverged materially, with the buyer's build supporting a meaningfully lower value. Rather than treating this as an expected and unremarkable feature of any buyer-side diligence exercise, the team investigated which specific assumptions were driving the gap.

Findings

The divergence traced primarily to two assumptions in the seller's management case: a revenue growth rate in the outer forecast years that continued at a pace above what the target's recent historical performance or disclosed pipeline supported, and a margin expansion assumption that was not tied to any specific, disclosed operational initiative such as a cost program or pricing action. Both assumptions, individually plausible on their face, compounded across the forecast period into a substantial share of the total valuation gap.

Root Cause

The seller's management case had been prepared, as is common, with an inherent orientation toward supporting a higher valuation in a sale process, and its growth and margin assumptions had not been independently substantiated against the specific operational drivers that would need to materialize for them to be achieved. The buyer's initial diligence review had treated the management case's top-line numbers as a starting point for adjustment rather than building a fully independent case from first principles, which risked anchoring the buyer's own view to the seller's framing before the underlying assumptions had been tested.

Risk

Had the buyer relied on an adjusted version of the seller's management case rather than a fully independent build, it risked implicitly accepting the seller's unsubstantiated growth and margin assumptions as a baseline, understating the true valuation gap and potentially overpaying relative to what the target's own disclosed fundamentals could support.

Resolution

The buyer's team presented its independent DCF alongside the seller's management case, itemizing the specific assumptions driving the gap, and requested substantiation for the disputed growth and margin assumptions as part of continued diligence. Where the seller was able to point to specific, credible operational drivers, the buyer's case was adjusted accordingly; where no such substantiation was provided, the buyer's more conservative assumption was retained, and the resulting negotiated case — with a documented rationale for each material assumption — formed the basis for the buyer's final offer.

Lessons Learned

  • An independently built DCF, constructed from the buyer's own assumptions rather than adjustments to the seller's model, is a diligence tool in its own right, forcing every assumption to be made explicit and defensible on its own terms.
  • A material gap between a management case and a buyer case is not itself a red flag — it is the starting point for identifying exactly which assumptions are driving the difference and testing whether they are substantiated.
  • Growth and margin assumptions that are individually plausible can compound across a multi-year forecast into a substantial share of a total valuation gap, making outer-year assumptions worth particular scrutiny.
  • Resolving a management-case-versus-buyer-case gap through itemized substantiation, rather than a blanket average or a blanket rejection, produces a negotiated case both sides can stand behind.

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Frequently Asked Questions

Is this a real client engagement?

No. This is an illustrative, composite scenario built from patterns commonly observed in M&A diligence model reviews. It does not describe a specific, identifiable transaction.

What is the difference between a management case and a buyer case in M&A diligence?

The management case is the target's own projection, typically prepared by or with the seller and often reflecting an optimistic view of achievable growth and margin. The buyer case is the acquirer's own, independently built projection, typically using more conservative assumptions the buyer can defend and underwrite on its own.

Why build a full independent DCF rather than just adjusting the seller's model?

Adjusting the seller's model risks inheriting its structure, its hidden dependencies, and any assumptions baked into supporting schedules that are not immediately visible. An independently built DCF, even where it references the same historical financials, forces the buyer's team to make every assumption explicit and defensible on its own terms.

What did the gap between the two cases turn out to reflect?

The gap traced primarily to the seller's revenue growth assumption in the outer forecast years and a margin expansion assumption that was not clearly supported by any specific, disclosed operational initiative, rather than to any single obviously incorrect input.

How was the gap resolved?

Not by simply averaging the two cases, but by the buyer's team requesting specific substantiation for each assumption driving the gap, accepting some elements of the management case where substantiated and discounting others where it was not, arriving at a negotiated case with a documented rationale for each material assumption.

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