Who Tests Whether Acquiring a Business Is the Right Decision?
Why financial, legal and commercial due diligence do not necessarily test the governing acquisition decision.
Ultimately, the buyer is responsible for deciding. But responsibility for the acquisition is not the same as an independent test of the judgement behind it. Specialist advisers examine defined parts of the target or transaction. Corporate development, the CFO, an investment committee or the board then combines those findings into the acquisition decision. Unless the buyer creates a separate mandate, nobody may be responsible for testing that combined judgement as a whole.
Acquisition Decision Diligence is Cortavian's term for that independent test: whether the buyer is solving the right problem, whether acquisition is the right route and whether this target justifies commitment when credible alternatives are considered.
Can a business pass due diligence and still be the wrong acquisition?
Yes. A target can be financially sound, legally clean and commercially attractive yet still be the wrong acquisition for a particular buyer.
The need behind the deal may have been framed too narrowly. Ownership may be a more expensive or restrictive route than building, partnering or licensing. The target may be strong while the buyer lacks the integration capacity, operating model or management attention required to realise the case. The expected return may depend on assumptions that are individually plausible but collectively fragile.
None of those possibilities makes the target a bad business. They concern the fit between the buyer's objective, the chosen route, this particular target and the buyer's ability to own what it is considering acquiring.
What conventional acquisition due diligence tests
Each specialist workstream has a legitimate and necessary mandate. Financial diligence examines matters such as financial performance, cash generation, balance-sheet exposures and the assumptions informing valuation. Legal diligence examines the corporate, contractual, regulatory and liability position within its agreed scope. Tax diligence addresses tax exposures and transaction consequences.
Commercial diligence examines the target's market, competitive position, customers, business plan and growth assumptions. Operational and technical workstreams may test the capabilities, systems, resilience, dependencies and integration demands on which the deal case relies. Other disciplines are added where the target, sector or transaction requires them.
These are not narrow contributions. They can expose serious weaknesses, reshape valuation, alter contractual protection or stop a transaction. Their primary focus, however, is normally the target, the transaction or the commissioned workstream.
The distinction is one of mandate, not quality. Financial, legal and commercial diligence usually test defined aspects of the target or transaction. Acquisition Decision Diligence tests the buyer's governing judgement across those findings: whether acquiring this business is the right decision.
Who carries the combined acquisition judgement?
The answer depends on the buyer's ownership, scale and governance. Responsibility is often distributed across several participants rather than held by one role.
Corporate development may originate the opportunity, build the case, coordinate advisers and carry the process towards approval. It can challenge the deal as well as advance it. Its position is also close to the thesis and the work required to execute it, so independence should not be assumed merely because the team is analytically rigorous.
The CFO and investment committee may test valuation, funding, returns, risk and the quality of the supporting case. They can reject or condition an acquisition. Their decision is still made from material assembled through a process whose governing question, alternatives and assumptions may already have narrowed.
The board may hold final approval for a material acquisition and remains responsible for its own judgement. Board challenge can be strong. The board usually sees a developed recommendation, however, rather than independently rebuilding the decision from its original need, full set of alternatives and underlying evidence.
External advisers can bring market knowledge, transaction experience and challenge. Their mandate may cover strategy, target selection, valuation, negotiation or execution. Whether they independently test the whole decision depends on the scope they have actually been given.
A red team can force dissent and expose weaknesses in the preferred case. Its contribution may be episodic or confined to critique. Unless the mandate extends further, it does not necessarily integrate all findings, compare the full alternatives and reach the independent acquisition judgement.
These are structural observations, not claims of incompetence or universal conflict. Any of these participants may ask the right questions. The issue is whether someone has been expressly mandated to test the governing acquisition decision across the workstreams and remain independent of the preferred answer.
The question that can remain unowned
A buyer can receive a sound financial report, a careful legal report and a persuasive commercial report. The findings can be discussed by experienced executives and challenged by an investment committee. Yet one question can remain without an independent owner:
Does the combined evidence support this buyer acquiring this business to achieve this objective, compared with the credible alternatives?
Coordination between workstreams helps findings reach the decision-makers. It does not by itself establish that the original question was correctly framed, that acquisition remains the best route or that the strongest case against proceeding has been developed in full.
Who tests the acquisition decision when every adviser is testing only their own workstream? Sometimes a buyer has built that responsibility explicitly into its governance. Where it has not, the judgement may be tested only through the combined effect of meetings, papers and approval gates. That can be rigorous, but it is not the same as a distinct independent mandate.
What Acquisition Decision Diligence tests
Acquisition Decision Diligence independently examines the judgement to acquire before commitment. It begins with the way the decision has been framed: the underlying need or objective, why acquisition is the chosen route and why this target is the proposed answer.
It then tests the assumptions and dependencies supporting the case, the strength of the evidence, and the credible alternatives that may have narrowed too early. Those alternatives include other routes to the objective and the option of not proceeding.
The examination also includes the buyer. Capability, integration capacity, management attention and organisational readiness can determine whether value available in the target is value this buyer can realise. Opportunity cost is part of the decision because capital, time and leadership attention committed here cannot be committed elsewhere.
Risks of action and inaction are examined together. The work makes clear what would change the answer and reaches one independent recommendation: Proceed, Change, Pause or Stop, with the conditions, uncertainty and residual risk attached to that judgement made explicit.
Acquisition Decision Diligence is the independent testing of the decision to acquire before commitment.
How it differs from acquisition due diligence
Conventional acquisition due diligence principally produces evidence about the target and transaction. Acquisition Decision Diligence asks whether the recommendation to acquire is justified when that evidence is considered together with the buyer's objective, alternatives and capacity to execute.
The disciplines work alongside one another. Acquisition Decision Diligence can use specialist findings, identify questions that require further specialist work and test whether the deal thesis survives the evidence. It does not issue legal, financial, tax, commercial or technical opinions and does not replace the advisers responsible for them.
This boundary is also why a broader advisory role is not enough on its own. The relevant question is not whether an adviser uses the language of challenge or strategy. It is whether the adviser has a defined mandate to test the acquisition decision itself, including the no-deal case, and reach an independent judgement across the evidence.
When the work should happen
Acquisition Decision Diligence must happen while the decision can still change. That may be before substantial specialist work begins, alongside it or when new findings alter the case. The appropriate point depends on the maturity, evidence and governance of the decision.
Starting earlier can test whether acquisition and this target deserve further commitment. Work performed later can still be useful if price, structure, conditions or the decision to proceed remain open. Once the buyer is unwilling or unable to reconsider the answer, independent challenge has become post-rationalisation rather than diligence.
What Cortavian does
Cortavian is an independent Decision Diligence practice. It provides Acquisition Decision Diligence for buyers who need the governing acquisition judgement tested before commitment.
Cortavian works across the available specialist evidence and the buyer's case. It tests the framing, assumptions, alternatives, dependencies, risks of action and inaction, opposing case and conditions for proceeding. It then reaches an independent judgement while the client retains responsibility for the decision.
The work sits alongside financial, legal, commercial and other specialist diligence. Its mandate is the decision those workstreams inform.
Sources and scope
The descriptions of financial and commercial due diligence draw on ICAEW Corporate Finance Faculty Best-Practice Guidelines 71 and 72. The governance discussion uses the UK Corporate Governance Code 2024 only as a reference point for board responsibility, information and challenge in companies to which the Code applies. It is not an acquisition-specific standard and does not apply to private companies. The term, distinction and definition of Acquisition Decision Diligence are Cortavian's own framework.
Before the decision hardens
Establish whether the decision warrants independent testing.
Decision Triage is Cortavian's free suitability and proportionality assessment. It helps establish whether Decision Diligence is warranted and informs the appropriate scope. It does not perform the diligence or recommend whether an acquisition should proceed.
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