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A. INTRODUCTION : THE CENTRALITY OF DUE DILIGENCE IN M&A
Mergers and acquisitions have become a defining instrument of corporate expansion, enabling enterprises to enter new markets, enhance technological capabilities, scale rapidly and consolidate sectoral influence. Behind every successful M&A lies a foundation of investigative scrutiny known as due diligence, which determines whether an acquisition is financially sound or legally fatal. In principle, due diligence serves as a comprehensive diagnostic mechanism through which the acquirer evaluates the financial, regulatory, legal, commercial and operational standing of the target company. It is not meant to be a perfunctory exchange of documents, but an in-depth assessment that examines the truth behind representations made by the seller. The Corporate Finance Institute describes due diligence as the structured process of verifying corporate information in order to determine the true valuation, associated risks and sustainability of an acquisition. It is essentially a risk filter, and a buyer who walks into an acquisition without diligence enters the transaction blindfolded.
When diligence is robust, it acts like an x-ray mechanism that reveals hidden fracture points. It identifies regulatory defaults, tax liabilities, governance weaknesses, litigation exposure, financial misreporting, ambiguous intellectual property ownership and operational gaps that could otherwise remain concealed beneath layers of incomplete disclosure. However, when diligence is hurried, superficial or structurally flawed, it fails to detect risks that later surface as litigation, penalties, impairment losses or operational breakdown. In such circumstances, contractual safeguards cannot reverse the loss inflicted by oversight, and a transaction that appears lucrative in negotiation becomes burdensome in execution. The necessity of due diligence, therefore, is not preventive in a symbolic sense, it is economically determinative.
B. THE ANATOMY OF DUE DILIGENCE FAILURE
Although corporate literature universally acknowledges the necessity of diligence, the process frequently collapses due to behavioural, structural and operational deficiencies. One of the most common causes of failure arises when diligence relies solely on documentation supplied by the seller. When information is curated selectively, and the acquirer does not independently verify disclosures against external filings, regulatory reports or third-party records, the diligence exercise becomes a passive data review rather than an investigative inquiry. The second major cause lies in curtailed diligence timelines, particularly in distressed transactions, insolvency scenarios or highly competitive bidding environments where buyers are compelled to complete diligence under compressed deadlines. Time pressure results in omission which results exposure that converts post-closing into liability.
A third systemic failure emerges from fragmented diligence, where legal teams investigate corporate approvals and litigation history, financial teams analyse revenue and expenditure, tax teams examine assessment orders, and technology teams review system architecture but none of these streams are integrated into a unified risk narrative. When diligence is operated by different teams or departments, these insights become incomplete, and the combined risk map remains invisible. It must be noted that diligence is not merely a file-based review but a critical synthesis of compliance integrity, operational capacity and legal responsibility. It is further highlighted that in cross-border acquisitions, complexity increases exponentially because differences in accounting law, governance culture, documentation language and regulatory environment limit visibility, thereby magnifying the probability of oversight. Due diligence therefore fails not due to conceptual weakness but because organisations approach it as review rather than investigation, as compliance rather than risk-mapping, and as formality rather than foresight.
C. WHEN DUE DILIGENCE FAILS, LIABILITY TRANSFERS TO THE BUYER
The consequences of inadequate due diligence are most visible not at signing, but in the months or years following acquisition when undisclosed liabilities surface. A company that acquires a manufacturing business without verifying environmental compliance may learn later that regulatory permissions were either expired or fraudulently obtained, leading to closure notices and punitive sanctions. Similarly, a buyer who does not investigate ongoing labour disputes may inherit litigation exposure, employee claims or statutory arrears for PF, ESIC or gratuity non-payment. Tax liabilities often appear retrospectively through reassessment proceedings, especially when past management failed to disclose income accurately or maintain audit integrity. Likewise, a failure to verify intellectual property ownership may result in infringement lawsuits when a competitor claims superior rights to patents, trademarks or licensing agreements.
The law is unequivocal in its treatment of such situations. Statutory liability travels with the business, not with the management that previously controlled it. Once the acquisition is complete, the acquirer becomes the face of compliance responsibility, and neither ignorance nor optimistic intent shields it from enforcement. This principle is reinforced by stating that regulatory breaches predating acquisition bind the acquirer regardless of contractual attempt to allocate liability back to the seller. In essence, when diligence fails, liability does not vanish it simply changes hands.
D. CONTRACTUAL PROTECTION IS IMPORTANT, BUT NOT A SUBSTITUTE FOR DILIGENCE
To reduce risk transfer, buyers incorporate representations, warranties, indemnities, escrows, holdbacks, survival clauses and material adverse change provisions into share purchase agreements. Representations and warranties function as formal statements whereby the seller affirms that financial statements are accurate, that there are no undisclosed liabilities or litigations, and that regulatory filings are complete and truthful. Indemnity provisions enable the buyer to recover loss where representations prove false. Escrow and holdback mechanisms retain a portion of the purchase price as a security pool, creating a fund from which the buyer may recover damages without initiating litigation. Material Adverse Change clauses allow a buyer to withdraw from the transaction if the business deteriorates substantially before closing, while survival clauses define the duration for which indemnity claims may be raised.
Although these mechanisms are sophisticated and necessary, they are second-line protections. Contractual remedies offer compensation only after loss is incurred. They cannot prevent loss, protect brand equity, restore valuation or reverse operational damage. A contract may reimburse expense incurred, but it cannot buy back lost reputation, lost market share, shareholder distrust or regulatory hostility. Indemnity is only as effective as the buyer’s ability to detect the breach within the survival period. A liability undiscovered for three years cannot be indemnified if the survival clause expires after two. A contractual shield is therefore curative and not preventive. It treats injury after occurrence, whereas due diligence exists to prevent the injury itself.
E. WHY ENFORCEMENT OF CONTRACTUAL SAFEGUARDS STILL FAILS IN REALITY
Even when agreements contain well-drafted indemnities, escrow allocations and survival limits, enforcement frequently becomes contentious because sellers negotiate knowledge qualifiers that restrict liability to what they were “aware of”, placing the burden of proof on the buyer. Many agreements contain materiality thresholds, allowing sellers to withhold disclosure of liabilities considered insignificant at the time of negotiation. These “insignificant” liabilities often compound post-closure and transform into significant obligations. Escrow accounts are rarely set high enough to absorb the entirety of a concealed liability, particularly where exposure relates to environmental non-compliance, tax reassessment or long-standing litigation. Furthermore, statutory enforcement supersedes contractual design. No indemnity clause can stop the tax department from issuing a penalty order, nor can an escrow account prevent the Pollution Control Board from suspending a factory license. Contract protects financially, regulatory law protects public interest. Public interest prevails.
Therefore, the tension between diligence and contract is unmistakable. A contract cleans the wound, but diligence avoids the wound altogether.
F. REAL-WORLD ILLUSTRATION : WHEN MULTI-BILLION DOLLAR DEALS COLLAPSED DUE TO POOR DILIGENCE
The Daiichi Sankyo acquisition of Ranbaxy is a monumental example of diligence collapse in Indian corporate history. Daiichi purchased Ranbaxy Laboratories for USD 4.6 billion, confident in the company’s pharmaceutical leadership and global market exposure. After acquisition, the United States Food & Drug Administration uncovered extensive data integrity lapses, fabrication of clinical documentation and regulatory violations. These facts were either undisclosed or inadequately evaluated during diligence. Daiichi initiated arbitration, secured an award, and pursued enforcement, but by that stage the commercial decline was irreversible. The legal victory did not reinstate brand trust or restore billions lost in impairment. This case demonstrates that a post-acquisition remedy, even if successful, does not restore value destroyed by missed compliance risk.
The OYO–Zo Rooms dispute in India serves as an equivalent example within the technology sector. Assets, agreements and IP transfers lacked clarity and diligence, prompting litigation over valuation and contractual enforceability. In each instance, failure of diligence preceded failure of contract, meaning litigation became the default remedy because prevention was absent.
A similar pattern unfolded in the Hewlett-Packard acquisition of Autonomy Corporation. HP acquired Autonomy for USD 11.1 billion, only to discover post-closing that revenue reporting had been artificially inflated. A write-down of USD 8.8 billion followed, sending ripples across global M&A practice.
G. INTERNATIONAL PERSPECTIVE : DIFFERENT MARKETS, SAME OUTCOME WHEN DILIGENCE FAILS
Globally, regulators and financial analysts acknowledge that M&A failure is rarely strategic. It is often operational. In the United States, empirical studies show that nearly 70 percent of unsuccessful acquisitions collapsed because diligence did not expose liabilities buried within governance structures or compliance profiles. In the United Kingdom, the Financial Conduct Authority repeatedly stresses the importance of forensic diligence, particularly in acquisitions involving data privacy, AI-driven product infrastructure and ESG-sensitive sectors. Singapore’s regulatory advisories echo similar caution, especially regarding acquisitions in fintech, cybersecurity and healthcare markets where disclosure risk is materially high. Across jurisdictions, legislation varies, but failure pattern does not. If diligence is weak, acquisition disintegrates regardless of geography.
H. THE FUTURE OF M&A PROTECTION : DUE DILIGENCE MUST BECOME FORENSIC, NOT FORMALISTIC
The path forward requires organisations to transform due diligence into a forensic exercise that investigates truth rather than accepts documentation. This means verifying compliance status through regulatory portals, independently examining tax assessments, cross-checking litigation with court registers, conducting forensic financial audits, reviewing ESG compliance trails, validating IP registration chains, assessing cyber-security frameworks and understanding cultural governance. Diligence must not stop at confirming that licenses exists, but it must verify that licenses remain valid, renewable and lawfully acquired. It must not assume that absence of disclosed litigation means absence of dispute; it must scan judicial repositories, arbitration records and tribunal listings. It must not rely solely on audited balance sheets; it must examine cash flow patterns, inventory control data, customer churn, vendor obligations, asset impairment trails and debt ageing records. True diligence is not a document review but it is a truth verification exercise.
When diligence operates as interrogation, indemnity becomes a safety net rather than recovery lifeboat. When diligence is superficial, indemnity becomes the only path of rescue and even that rescue may arrive too late.
I. CONCLUSION : ACQUISITIONS SUCCEED WHEN DILIGENCE PREVENTS, NOT WHEN CONTRACT COMPENSATES
Due diligence failures in M&A do not occur because diligence is unnecessary. They occur because diligence is rushed, under-analysed and poorly integrated. Contractual protections such as indemnity, escrow and survival limits have critical value, but they operate after the crisis, never before. An acquisition that invokes indemnity is not protected, it is recovering from preventable loss. The true measure of diligence is not whether indemnity was triggered but whether indemnity was unnecessary.
A successful acquisition, therefore, is not one that survived litigation, but it is one that no litigation was required for.
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