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Equity Research Analyst Catches an Overstated Terminal Value Before a Buy Rating

Case Study • — • 4 min read

Audience
Equity Research • Investment Committees
Last Reviewed
—
Updated
Version 1.0

Executive Summary

This is an illustrative, composite scenario, not a specific real transaction. It follows an equity research analyst finalizing a DCF valuation supporting a planned buy rating on a listed company, whose peer review of the model finds that the perpetuity growth rate used in the terminal value calculation was left unchanged after a separate update lowered the WACC used elsewhere in the model, narrowing the gap between growth rate and discount rate and materially inflating terminal value. The core lesson: WACC and the perpetuity growth rate must be re-checked together whenever either one changes, since their combined effect on terminal value is what actually drives the valuation conclusion.

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

An equity research analyst was finalizing a DCF valuation supporting a planned buy rating on a listed corporate. The model had been built several months earlier with a WACC of 9.5% and a perpetuity growth rate of 3.0%, a combination the analyst had originally benchmarked against the company's long-run nominal GDP growth exposure and considered conservative relative to the sector.

In the weeks before the rating was finalized, the analyst updated the model's beta input following a shift in the company's observed trading beta, which reduced WACC to 8.2%. The perpetuity growth rate was not revisited at the same time, since the update was treated as a discount-rate-only change.

The Problem

Before publishing the buy rating, a peer reviewer performing a structural check on the model recalculated the implied exit multiple from the perpetuity-growth terminal value, a routine cross-check described in Terminal Value: Perpetuity Growth vs. Exit Multiple, and found it sat well above the observed trading multiple range for the company's closest listed peers.

Findings

Recalculating the terminal value at the updated 8.2% WACC with the unchanged 3.0% growth rate showed that the gap between WACC and growth rate had narrowed from 6.5 percentage points to 5.2 percentage points. Because the perpetuity growth formula divides terminal-year cash flow by that gap, the narrower denominator increased terminal value by a proportion substantially larger than the WACC change itself would suggest at first glance, and the resulting implied exit multiple no longer sat within a defensible range against comparable companies.

Root Cause

The model's structure treated the WACC input and the perpetuity growth rate input as independent cells with no cross-check triggered when either one changed. The beta update was made in isolation, following the standard process for updating a single input, without a corresponding step to re-run the implied-multiple sanity check that would have flagged the resulting terminal value as no longer consistent with observable market pricing.

This is a structural and process root cause — a missing re-validation step following an input change — not a case of the original growth rate assumption having been unreasonable at the time it was set.

Risk

Had the peer review not caught the inconsistency, the buy rating would have been published on the strength of a target price materially inflated by a terminal value that no longer passed a basic cross-check against the sector's observed trading multiples, exposing the analyst and the firm to a rating that could not be defended against a straightforward client question about the implied exit multiple.

Resolution

The analyst re-examined the perpetuity growth rate in light of the updated WACC, concluding that a growth rate of 2.5% remained defensible and produced an implied exit multiple within the observed peer range. The model was updated, the target price recalculated, and the buy rating was published on the basis of the corrected terminal value, with both the WACC and growth rate assumptions, and their combined implied multiple, documented in the published report.

Lessons Learned

  • WACC and the perpetuity growth rate must be re-checked together whenever either one changes, since their combined effect on terminal value, not either assumption viewed in isolation, is what actually drives the valuation conclusion.
  • The implied-exit-multiple cross-check is not a one-time build step; it should be re-run any time an input to either side of the perpetuity formula changes.
  • A terminal value that looks individually defensible on each of its two inputs can still be aggressive in combination — precisely the interaction addressed in the DCF pillar's core coverage of terminal value concentration.
  • Peer review focused specifically on structural cross-checks, distinct from a general read-through of the model, is what surfaced this issue before publication.

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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 DCF model reviews. It does not describe a specific, identifiable transaction.

Why does a small change in WACC have such a large effect on terminal value?

Because the perpetuity growth formula divides by (WACC minus the growth rate). As WACC falls and approaches the growth rate, that denominator narrows, and terminal value increases disproportionately relative to the size of the change in WACC itself.

Why wasn't the growth rate assumption itself the error?

The growth rate had been reasonable when it was originally set, given the WACC in place at that time. The error was structural — a subsequent change to WACC was not accompanied by a re-check of whether the growth rate assumption remained appropriate relative to the new WACC, not a standalone misjudgement of the growth rate in isolation.

How could this have been caught earlier?

Re-running the implied-exit-multiple cross-check every time either WACC or the growth rate changes, rather than only when the model is first built, would have flagged that the perpetuity-implied multiple had moved outside a reasonable range for the sector.

Does this mean WACC and growth rate should never be updated independently?

They can be updated independently when each update is followed by a re-check of the combined effect on terminal value, specifically the implied exit multiple cross-check and the reasonableness of the resulting gap between WACC and growth rate.

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