Top mistakes found in international M&A agreements and how to prevent them

Statistics on international M&A transactions show that a significant share of post-closing disputes arises not from business performance, but from flaws in contractual structure. Inaccurate wording, weak warranties, improper risk allocation, and a formal approach to compliance clauses can undermine the economic rationale of a deal. In cross-border agreements, these issues are further aggravated by differences in legal enforcement and the parties’ expectations. As a result, companies may face double taxation, regulatory claims, and prolonged arbitration proceedings. Understanding typical contractual mistakes makes it possible to build a more resilient transaction structure before signing. In this article, we consider the most common mistakes found in international M&A agreements and practical ways to prevent them.

Structural mistakes in determining the subject matter of the transaction

A clear definition of the transaction scope is the foundation of any M&A agreement. It sets the boundaries of the acquired business, allocates risks, and shapes the parties’ expectations. In practice, many international deals encounter problems because the parties have different understandings of what is being sold and purchased. These issues may seem minor at signing but almost always lead to post-closing disputes.

Inaccurate definition of assets and liabilities

One of the most common mistakes is a general or fragmented description of the assets and liabilities included in the deal. Phrases such as “all assets related to the business” or “customary liabilities” appear clear but leave excessive room for interpretation.

Problems typically arise when:

• It is unclear whether contingent or problematic liabilities transfer;
• Corporate and operational assets are not clearly distinguished;
• Off-balance-sheet liabilities, guarantees, or historical risks are omitted.

In cross-border transactions, differences in legal systems and accounting approaches add complexity. What is implicit in one jurisdiction may require explicit contractual wording in another.

Incomplete transfer of operational and financial rights

Even where assets are properly described, parties often overlook operational and financial rights without which the business loses practical value. These include licenses, permits, IP rights, key contracts, domain names, IT systems, and data access.

A common assumption is that such elements “automatically follow the business”. In international M&A, this is rarely the case. Many licenses and contracts:

• Are non-transferable without third-party consent;
• Are subject to territorial limits;
• Are associated with specific legal entity rather than the business itself.

As a result, the buyer may formally acquire the company or assets, but not the ability to operate effectively.

Mistakes in purchase price structure and adjustment mechanisms

Poorly structured purchase price provisions and adjustment mechanisms are another frequent source of disputes. Parties often focus on the headline price while giving insufficient attention to earn-outs, closing accounts, or price adjustments.

Issues arise when:

• Conditional price criteria are vaguely defined;
• There is no agreed accounting methodology;
• Timelines, procedures, and consequences of disagreements are unclear.

In international deals, differences in accounting standards and financial practices amplify these risks, turning the post-closing phase into a source of conflict even when the transaction is commercially sound.

Inappropriate allocation of risks and responsibilities

Incorrect risk allocation is one of the main sources of disputes in international M&A transactions. Even with thorough due diligence, an agreement can remain vulnerable if indemnities, warranties, and liability limitations do not reflect the actual balance of interests and the cross-border nature of the deal.

Weak or unclear provisions on compensation for losses

A common mistake is the use of abstract or boilerplate indemnity clauses that are not linked to specific identified risks. In such cases, the agreement does not clearly define which losses are compensable, to what extent, and under what conditions. In international deals, this often leads to conflicting interpretations, as the parties rely on different legal traditions and expectations regarding standards of proof and causation.

Warranties and liability caps: mistakes in caps and baskets

Issues frequently arise where caps, baskets, and deductibles are borrowed from common law practice without proper adaptation to the governing law. In some jurisdictions, such limitations may not operate as expected or may be unenforceable for certain types of claims. As a result, a party relying on a predictable liability ceiling may face significantly higher exposure.

Limitation of remedies and enforcement

Another typical mistake is a misalignment between representations and warranties and the available remedies. A breach may be formally established but fail to result in compensation due to procedural restrictions, limitation periods, or poorly drafted enforcement provisions. In cross-border transactions, such gaps often surface only after closing, when the opportunity to adjust the contractual framework no longer exists.

Shortcomings in integration and transition arrangements

Even where the commercial terms and purchase price are properly agreed, the post-closing phase most often becomes the source of disputes. In international M&A agreements, deficiencies in regulating integration and the transitional period can result in the loss of key assets, management disruptions, and unexpected financial risks for the buyer.

Unclear post-closing obligations

One of the most common issues is vague or incomplete post-closing obligations. Agreements often rely on generic language about “assistance with integration” or “business transfer” without specifying the actual scope of these duties.

In practice, this creates risks related to:

• Departure or demotivation of key personnel;
• Lack of control over the transfer of clients, contracts, or IP;
• Management gaps during the transition;
• Disputes over responsibility for ongoing operational decisions.

Without clearly defined post-closing obligations, the buyer may formally close the deal while the business has not been effectively transferred.

Ineffective transitional services agreements (TSA)

Another critical mistake is the absence or superficial drafting of transitional services agreements. In cross-border deals, TSAs are often essential to ensure business continuity, particularly where the seller continues to provide IT, finance, HR, or operational support.

Problems arise when:

• A TSA is missing despite clear reliance on the seller’s infrastructure;
• The scope, duration, and service levels are undefined;
• Quality control and liability mechanisms are absent;
• There is no structured exit from the TSA.

As a result, the buyer may be faced with operational disruptions or be forced to build processes urgently without contractual protection.

Cultural and operational integration risks

International M&A transactions almost always involve cultural and organizational differences, yet these risks are rarely addressed in the contractual framework. The absence of specific commercial or organizational clauses can destabilize the business shortly after closing.

Typical consequences include management conflicts, reduced decision-making efficiency, loss of key employees, and divergence in corporate standards and compliance approaches. Ignoring integration risks at the contractual level leaves the post-closing phase exposed, even if the transaction was legally sound.

Compliance and regulatory issues

In cross-border M&A deals, compliance risks are often underestimated, especially when the business is already operating and appears formally compliant with local law. However, regulatory issues rarely surface immediately, they typically emerge after closing, when fixes become costly or impossible.

Underestimating antitrust / competition review

A critical mistake is misjudging whether merger control clearance is required. Parties often follow the logic of one jurisdiction and overlook filing rules in other countries where the parties have turnover, customers, or meaningful economic presence.

Issues arise when:

• Multi-jurisdictional filing requirements are missed;
• Turnover thresholds are calculated incorrectly;
• Closing occurs before all approvals are obtained (gun-jumping);
• Notifications contain incomplete or inaccurate data.

Consequences may include fines, mandatory structural remedies, or even forced unwinding of the transaction.

Breaches of international sanctions and export controls

Sanctions compliance remains one of the most sensitive areas in international M&A. A common mistake is assuming sanctions risks apply only to high-risk jurisdictions or a limited set of industries.

In practice, risks arise if:

• The target has clients, counterparties, or beneficial owners linked to sanctioned jurisdictions;
• The business uses technology subject to export controls;
• Previous transactions are not screened for sanctions exposure;
• Sanctions-related representations & warranties are drafted too generically.

Even indirect breaches can trigger banking restrictions or follow-on enforcement.

Mistakes in tax provisions and cross-border tax structuring

Tax provisions in the SPA and related documents are often treated as secondary, yet they frequently drive post-closing disputes. Mistakes are especially damaging in cross-border structures.

Typical issues include:

• Unclear allocation of pre-closing vs post-closing tax risks;
• Lack of robust tax indemnities;
• Ignoring permanent establishment exposure and withholding taxes;
• Misalignment between the intended tax structure and the actual operating model.

As a result, the buyer may face tax reassessments for periods it did not control.

Practical methods of preventing mistakes in international M&A agreements

Most mistakes in international M&A are not unique – they recur from deal to deal. This means a significant portion of risks can be prevented in advance by applying a structured approach to deal preparation and documentation, rather than making last-minute fixes at the final stage.

Standardized checklists and transaction playbooks

One of the most effective tools is the use of pre-developed checklists and transaction playbooks. They help structure the team’s work and reduce the risk of missing critical issues.

In practice, these tools help to:

• Consistently verify the deal scope and assets being transferred;
• Align due diligence findings with SPA terms;
• Control the completeness of representations & warranties;
• Identify red flags early in negotiations.

Playbooks are particularly valuable in serial or multi-jurisdictional transactions, where legal and market differences may not be immediately visible.

Expert-led cross-functional teams

Many M&A issues arise from fragmented work across legal, tax, financial, and operational advisers. When each function reviews the deal in isolation, critical interdependencies are often missed.

An effective model requires:

• Involvement of legal, tax, and financial experts at the same stage;
• Alignment of due diligence conclusions across teams;
• Engagement of operational and compliance specialists before closing, not after.

This approach helps uncover risks that are invisible within a single discipline, such as misalignment between tax structuring and the actual operating model.

Integration of technology (contract review tools, AI, automation)

Modern technology has become an important element of M&A risk management. Automated contract and data review does not replace lawyers, but significantly improves speed and consistency.

In practice, these tools allow teams to:

• Quickly identify unusual or high-risk clauses;
• Compare terms across multiple contracts within a group;
• Track inconsistencies between the SPA and ancillary documents;
• Reduce human error when dealing with large data volumes.

Such solutions are especially effective in deals involving extensive contract portfolios or complex corporate structures.

How can Key2Law help companies build mistake-free M&A agreements?

International M&A transactions require not only precise legal drafting, but also a deep understanding of financial, regulatory, and operational risks. Most critical issues arise at the intersection of due diligence, contractual structure, and post-closing mechanisms, when individual elements of the deal are not properly aligned legally or commercially. The Key2Law team supports M&A projects end to end, helping build a contractual framework that reduces the risk of disputes, regulatory exposure, and value erosion.

Key2Law assists clients throughout all stages of international M&A transactions, including:

• Structuring SPAs and ancillary agreements with cross-border risks and applicable law in mind;
• Legal coordination of financial, legal, and compliance due diligence and integration of findings into transaction documents;
• Drafting balanced representations & warranties, indemnities, and liability caps;
• Designing price mechanisms, earn-outs, and post-closing adjustments with reduced dispute risk;
• Advising on antitrust, sanctions, and regulatory aspects of the transaction;
• Supporting post-closing integration, transitional services agreements, and risk-allocation models.

If you are planning an international M&A transaction or are already in negotiations, identifying and addressing potential issues before signing is critical. Contact the Key2Law team to secure legally sound support and protect deal value at every stage.