When acquisitions go wrong: alleged warranty breaches, fraud, misrepresentation and accounting irregularities

Author: Helen Lyne, Senior Consultant Dispute Resolution Lawyer | Last updated: 9th June 2026

Even carefully planned mergers and acquisitions can falter where the target’s position does not reflect what was promised. Disputes often follow, particularly where there are alleged warranty breaches, misrepresentation, fraud, or accounting irregularities identified after completion. There is also a growing trend of value erosion caused by post-transaction issues such as earn-out disagreements, misalignment between founders and investors, and breakdowns in governance.

Understanding how risk is allocated in the sale documentation, the remedies that might be available, and the practical steps to build or defend a case is essential. This guide outlines the core legal concepts, common triggers, routes to recovery, and how Setfords can support you when acquisitions gone wrong due to alleged warranty breaches, fraud, misrepresentation, accounting irregularities and more.

Article summary: Post-acquisition disputes arise when the target’s condition, finances, or compliance position differ materially from what was warranted or represented at the time of the deal. Buyers may have claims for breach of warranty, misrepresentation, or fraud, while sellers can face liability even where contractual limitations apply. The most common triggers include undisclosed liabilities, accounting irregularities, and earn-out disagreements. Early legal advice, forensic accounting support, and careful review of the sale documentation are essential to preserving and pursuing a claim effectively.

Warranties, representations and indemnities in M&A 

Warranties are contractual statements of fact about the target at a particular point in time, usually given by the seller in a share purchase agreement or asset purchase agreement. Where a warranty is untrue, the buyer may be entitled to damages for breach of contract.

In practice, the aim of any remedy for breach of warranty is to place the buyer in the position it would have been in had the statement been accurate, most commonly measured by the difference between the price paid and the actual value received. Contractual limitation periods typically run for 12 to 24 months for general warranties, with longer periods for tax matters. 

Representations are statements that induce a party to enter into the contract. If a statement serves both as a warranty and a representation, a buyer may have additional recourse in misrepresentation. This can matter considerably: misrepresentation can justify rescission of the contract or damages assessed in tort, which may differ from contractual damages. Time limits, evidential burdens and the impact of exclusion clauses can diverge between warranty and misrepresentation claims, shaping the available remedies for breach of warranty as well as alternative strategies. 

Indemnities operate as promises to reimburse specific liabilities on a pound-for-pound basis, commonly used where there is a known or high-risk issue such as a tax exposure, environmental liability or ongoing litigation. Unlike breach of warranty remedies that focus on diminution in value, indemnities usually bypass debates about foreseeability and valuation, concentrating on the occurrence and quantification of the identified loss. They are particularly effective where causation could otherwise be contentious and where the loss is readily measurable. 

Sale agreements often include knowledge qualifiers, materiality thresholds, and carefully drafted disclosure regimes. The disclosure letter is pivotal, as matters properly disclosed typically qualify or carve out liability for breach. Entire agreement clauses aim to limit rights to the terms of the contract and may restrict reliance on pre-contract statements, although fraud is rarely excluded effectively. How these provisions interact will influence the remedy for breach of warranty, the broader breach of warranty remedies available, and the viability of any misrepresentation claim. 

Common triggers for post-completion disputes 

Alleged warranty breaches frequently arise when undisclosed liabilities surface, such as historic tax exposures, regulatory penalties, onerous contracts or pending disputes. Loss of key customers or suppliers shortly after completion can also prompt claims, particularly where the resilience of the pipeline or customer concentration was warranted. Regulatory non-compliance in data protection, health and safety, FCA rules or sector-specific licensing can lead to remediation costs and valuation impact. 

Fraud and misrepresentation claims develop where key statements that induced the deal are inaccurate or misleading, whether in the data room, management presentations, financial models or the disclosure letter. Examples include overstated order books, hidden churn, selective disclosure, or statements presented without material qualifiers. Where deceit is established, contractual exclusions and limitations often fall away, and breach of warranty remedies may be supplemented or replaced by tortious claims with a wider measure of loss. 

Accounting irregularities are a recurring source of contention. These may include aggressive revenue recognition, premature recognition of long-term project income, improper stock valuation where obsolete or slow-moving inventory is carried at cost rather than net realisable value, and EBIT/EBITDA adjustments that over-normalise costs. Completion accounts disputes are common where working capital is misstated or definitions are unclear. Forensic analysis is often needed to distinguish judgement calls and acceptable accounting policy choices from deliberate manipulation. 

A substantial proportion of problems also originate from governance friction after completion. Earn-out disputes frequently concern revenue recognition, cost allocation, access to information, adherence to operating covenants, and whether the buyer has used reasonable endeavours to achieve milestones. Misalignment between founders and investors can develop where strategic direction, risk appetite or management autonomy diverge from expectations. Integration challenges, such as unclear reporting lines, conflicting incentive structures or delayed systems integration, may undermine performance and lead to claims grounded in breach, lack of good faith or breach of implied duties. 

Remedies and routes to recovery 

For breach of warranty, the standard contractual remedy is damages reflecting the difference between the warranted and actual value of the target. The buyer must establish breach, causation and loss, subject to contractual limits.

These breach of warranty remedies are distinct from misrepresentation remedies, which can include rescission where feasible, or damages in tort. Negligent misrepresentation may yield damages for losses flowing from reliance, while fraudulent misrepresentation can allow a broader measure of loss and may neutralise contractual limitations and exclusions. Understanding the precise remedy for breach of warranty, and when to rely on alternative causes of action, is central to strategy. 

Sale documentation often contains liability caps, baskets and de minimis thresholds. A basket aggregates smaller losses before they become recoverable, while a de minimis threshold excludes minor claims entirely. Notice provisions typically require claims to be notified within a specified period and to include particulars of the alleged breach with a good faith estimate of quantum. Conduct of claims clauses set out how third-party claims are to be managed and who controls the defence. Exclusions for consequential or indirect loss are common, but their effect depends on the drafting and the context. Parties should also consider the duty to mitigate and rules against double recovery when pursuing overlapping breach of warranty remedies and misrepresentation claims. 

Warranty and indemnity insurance can provide an important backstop, usually covering unknown warranty breaches subject to exclusions for known issues, forward-looking statements or fraud by the insured. Strict notice requirements usually apply under both the policy and the sale agreement. Timely notices that identify the relevant warranties or representations, set out the factual basis and offer a reasoned estimate of loss are essential to preserve rights and ensure access to remedies for breach of warranty where available. 

For governance-related disputes, the remedy will be shaped by the drafting. Earn-out provisions often include mechanisms for expert determination of accounting disagreements, escalation clauses, and covenants on the conduct of business. Claims may arise for breach of contract, breach of implied duties of good faith or rationality where applicable, and in some instances misrepresentation where pre-deal assurances about operational freedom induced the transaction. Where board or shareholder rights are engaged, shareholder remedies and directors’ duties may also be relevant. 

Building and defending a claim 

Early, structured case assessment is vital. Preserve documents and data promptly, including emails, messaging platforms, accounting systems, board minutes and the data room archive. Review the share purchase agreement, disclosure letter, Q&A logs and any reliance statements to understand protections and carve-outs. Establish a clear link between the alleged breach or misrepresentation and the loss, separating it from post-completion trading conditions or integration decisions that may have affected performance. 

Forensic accounting and valuation support can be decisive. Key techniques include: 

• Reconstructing revenue cut-off and testing enforceability of contracts. 
• Inventory roll-forwards and assessment of net realisable value. 
• Debtor recoverability and ageing analysis. 
• Evaluating EBITDA normalisations and non-recurring items. 
• Testing completion accounts and working capital definitions against the SPA. 
• Valuation analysis to measure diminution in value using market and income approaches. 

Strategically, buyers may plead warranty and misrepresentation in the alternative, considering limitation periods, the scope of recoveries and the effect of exclusion clauses. Sellers should examine disclosure and reliance provisions in detail, scrutinise entire agreement wording, and challenge causation, mitigation and valuation assumptions. Settlement leverage is often shaped by escrow arrangements, the response of W&I insurers and the practicality of rescission. The chosen dispute resolution route—expert determination for completion accounts, arbitration for cross-border transactions, or litigation—will influence timetable, confidentiality and cost.

Practical steps to prevent issues in future deals 

Stronger due diligence is the first defence when acquisitions gone wrong due to alleged warranty breaches, fraud, misrepresentation, accounting irregularities etc is a risk. Financial, tax, legal and operational reviews should be targeted and probing. Red flags include sudden margin expansion without clear drivers, unusual manual journals near period end, negative operating cash flows despite reported profits, and inconsistent revenue recognition policies across subsidiaries or territories. Compliance diligence should test licences, data protection practices, anti-bribery controls, sanctions exposure and modern slavery frameworks. Cyber diligence should extend to operational technology, incident response readiness and third-party access management. 

Careful drafting helps prevent disputes. Tailor warranties to the business model, include specific indemnities for identified risks, and define disclosure standards clearly. Specify whether general data room disclosures are sufficient or whether fair and specific disclosure is required. Align materiality thresholds, knowledge standards and limitation provisions with the risk profile. Notice provisions should be explicit about timing, content and service details to minimise technical disputes. For earn-outs, define accounting policies, control over the business, information rights, permitted operational changes and dispute pathways with precision. 

After completion, protect value through robust integration and governance. Conduct early financial and compliance audits, confirm revenue recognition and stock controls, and establish governance for earn-outs, including regular reporting, access to management information and agreed methodologies. Clarify decision-making authority, maintain open communication between founders and investors, and align incentives across management. Early engagement with key customers and suppliers, alongside supply chain mapping, can surface issues before they crystallise into claims. 

How Setfords can help 

At Setfords, we advise buyers, sellers and investors on structuring, risk allocation and the negotiation of clear, enforceable sale agreements. Our corporate lawyers draft tailored warranties, focused indemnities and practical disclosure frameworks that reduce ambiguity and lower the risk of disputes. We also design robust earn-out mechanics and post-completion governance structures that minimise friction and protect value. 

When disputes arise, our litigation team acts quickly to investigate and pursue or defend claims. We coordinate urgent protective steps, instruct forensic accountants and valuation experts, and develop a clear case theory addressing breach, causation and quantum.

We are experienced in settlement strategy, including mediation, insurance recovery and escrow release processes, and we manage expert determinations, arbitration and litigation with efficiency and discretion. Our approach ensures that any remedy for breach of warranty is identified and pursued alongside alternative routes such as misrepresentation, so that overall remedies for breach of warranty are maximised where appropriate. 

Clients can access fixed-fee reviews of sale documentation, rapid assessments of claim viability and seamless collaboration between our corporate and disputes specialists. We bring together detailed drafting expertise and pragmatic dispute resolution to deliver effective breach of warranty remedies and outcomes in complex post-transaction scenarios, including earn-out disputes and governance breakdowns. 

For tailored advice, please contact Helen Lyne, a consultant solicitor at Setfords with extensive experience in corporate transactions and disputes: