5 Common Pitfalls Businesses Face During M&A Deals and How to Avoid Them

Mergers and acquisitions often fail to meet expectations when common risks are overlooked early. Businesses entering mergers and acquisitions transactions frequently encounter avoidable issues that affect deal value, timing, and long-term outcomes. Early preparation, clear documentation, and informed legal support reduce these risks and help maintain control throughout the process.

Working with specialist advisors ensures that each stage of the transaction is approached with clarity and structure. Their help can support businesses through preparation, negotiation, and completion, helping to avoid common errors that disrupt deals.

Keep reading, as this article explains five common pitfalls businesses face during M&A deals and how to avoid them.

1. Failing to Prepare the Business Properly Before Entering Mergers and Acquisitions Deals

Lack of preparation before entering mergers and acquisitions transactions often leads to delays, reduced offers, or failed negotiations.

Due diligence is the process by which a buyer reviews the financial, legal, and operational aspects of a business before completing a deal. Buyers rely on this stage to identify risks and confirm value. Gaps in documentation or unresolved issues give buyers leverage to renegotiate terms or withdraw.

Common issues include:

• Missing or incomplete contracts
• Unclear ownership structures
• Unresolved disputes between shareholders
• Inaccurate financial records

These problems reduce confidence and often result in price reductions or additional conditions.

However, having a structured pre-sale review helps identify and resolve issues before discussions begin. Legal advisors can review contracts, confirm ownership records, and ensure compliance obligations are met. Preparation also improves efficiency during due diligence and strengthens your negotiating position.

2. Treating Heads of Terms as Informal Rather Than Binding in Practice

Heads of terms set out the key commercial points agreed between parties before full legal documentation is drafted. Although often described as non-binding, they shape how the rest of the deal progresses.

Unclear or incomplete heads of terms create uncertainty. Buyers may attempt to renegotiate the price, introduce additional conditions, or extend timelines. Sellers who accept vague drafting often lose control of the process.

Key areas that require clarity include:

• Purchase price and adjustment mechanisms
• Exclusivity periods
• Deal structure
• Payment terms, including any deferred consideration

Clear heads of terms reduce the risk of later disputes and provide a stable framework for drafting the share purchase agreement, which is the main contract governing the sale of shares in a company.

Working with experienced mergers and acquisitions lawyers such as Rubric Law helps ensure that commercial intentions are reflected accurately at this stage. With experience advising on more than £750m in completed deals, Rubric Law supports businesses in structuring clear, commercially aligned agreements that reduce the risk of renegotiation later in the process.

3. Choosing the Wrong Deal Structure Without Fully Assessing Risk

Selecting the wrong structure affects tax exposure, liability, and operational continuity.

A share purchase agreement transfers ownership of the company itself, including all assets and liabilities. An asset sale allows the buyer to acquire selected assets and specific liabilities. Each approach carries different risks.

For sellers:

• Share sales are often more tax-efficient
• Asset sales may lead to higher tax exposure

For buyers:

• Share purchases provide continuity but include historic liabilities
• Asset acquisitions allow greater control over risk but may involve operational complexity

Employment obligations also differ. TUPE regulations, which protect employees when a business transfers, typically apply to asset sales and require employees to move under existing terms.

Clear advice from a mergers and acquisitions lawyer helps assess which structure aligns with your commercial goals and risk tolerance before negotiations progress.

4. Overlooking the Importance of Warranties and the Disclosure Letter

Warranties are contractual statements given by the seller about the condition of the business. If these statements are inaccurate, the buyer may bring a claim after completion.

The disclosure letter allows the seller to qualify warranties by identifying known issues in advance. This document plays a central role in managing post-completion risk.

Weak disclosure exposes sellers to financial claims. Buyers may recover losses if problems were not disclosed properly.

A strong disclosure process should:

• Identify all known risks and liabilities
• Align disclosures clearly with warranties
• Provide supporting documentation where necessary

Treating disclosure as a strategic exercise helps protect against future disputes. Careful drafting reduces uncertainty and ensures both parties have a clear understanding of the business being transferred.

5. Neglecting Post-Completion Planning and Governance

Attention often focuses on completing the deal, with limited consideration given to what happens afterwards. This creates challenges that affect performance and relationships between buyer and seller.

An earn-out is a mechanism where part of the purchase price is linked to future performance. Completion accounts determine final adjustments to the purchase price based on financial performance at closing. Both require careful planning.

Common issues include:

• Disputes over financial targets
• Lack of clarity on management responsibilities
• Misalignment between reporting methods and agreed metrics

Clear governance arrangements reduce these risks. Agreements should define:

• Who controls day-to-day operations
• How performance is measured
• How financial information is prepared and reviewed

Planning for post-completion outcomes protects deal value and helps avoid disputes that arise after closing.

What Steps Should You Take Before Starting an M&A Transaction?

Careful planning improves outcomes and reduces disruption. Businesses preparing for mergers and acquisitions deals should focus on practical steps that support a smoother process.

Key actions include:

• Conduct a legal and financial review before entering negotiations
• Organise documents within a secure data room for due diligence
• Clarify ownership structures and contractual obligations
• Review tax implications with specialist advisors
• Set realistic timelines, as most UK transactions take several months from heads of terms to completion

Regulatory considerations should also be assessed early. The Competition and Markets Authority has expanded powers under recent legislation, allowing it to review certain transactions even after completion. Preparation reduces uncertainty and supports more efficient negotiations.

In Short

Businesses that approach mergers and acquisitions with clear preparation, structured agreements, and informed legal support are better positioned to protect value and avoid disruption. Each stage of the transaction requires careful attention to both legal detail and commercial outcomes.