Legal due diligence for investors: how to check a company before buying?

Before investing in or acquiring a company, legal due diligence is essential to uncover hidden risks and ensure legal compliance. This process helps investors assess a company’s structure, contracts, litigation risks, and regulatory standing.  A recent example is the 2024 acquisition of CTD Tiles by Topps Tiles for £9 million. The company’s largest shareholder, MS Galleon, criticized the deal, arguing that insufficient due diligence led to poor outcomes and financial harm. It protects against costly surprises and supports smarter, safer investments. At Key2Law, we guide clients through this critical step with clarity and confidence.

What is legal due diligence?

Legal due diligence is the process of assessing a company’s legal standing, contracts, compliance, and governance to uncover hidden risks or obligations. Unlike financial or commercial checks, it focuses on whether the company is structurally sound and legally compliant.

Whether acquiring a company, purchasing shares, or entering into a strategic partnership, investors must first understand exactly what they are buying into. This is where legal due diligence becomes indispensable. It is a critical step in assessing the legal health, structure, and risks of a company. It ensures that any potential red flags are identified and addressed before the deal is closed. For investors, legal due diligence is not only a form of protection it is a gateway to smarter investments and greater long-term value.

Why is legal due diligence important for businesses and investors?

Legal due diligence isn’t just paperwork - it’s your defense against costly mistakes. According to Toptal, neglecting due diligence can lead to severe financial losses, as poor risk assessment often results in failed investments and legal liabilities. Research by Insights shows that the average loss per failed startup investment in the UK is approximately £1.5 million due to due diligence oversights. Similarly, companies facing regulatory violations can incur fines averaging $2 million over a 12-month period, highlighting the critical role of thorough legal assessment.

This means, skipping legal due diligence can lead to:

• Buying a company with hidden debts, lawsuits, or regulatory violations;
• Signing contracts with no real protection;
• Investing in a business that lacks licenses or operates illegally.

On the other hand, businesses that conduct thorough legal due diligence often experience significant growth. For example, a case study in the gas turbine industry showed how due diligence helped a company mitigate risks and make a strategic acquisition, strengthening its market position (SSA Power). Similarly, private equity firms use due diligence to maximize investment value, as seen in a case where rapid technology assessments led to a high-growth investment (MAccelerator). 

Advantages businesses and investors can get after legal due diligence: 

1. Understand the legal risks before committing. Identifying potential legal issues early helps you avoid costly mistakes, regulatory penalties, or unforeseen liabilities.
2. Negotiate better deal terms and pricing. Uncovering risks gives you leverage to adjust the purchase price, demand corrective actions, or secure better contractual protections.
3. Add legal protections like warranties and indemnities. Ensuring the deal includes safeguards like warranties and indemnities protects you from future legal claims and financial losses.
4. Avoid post-deal surprises. Thorough due diligence prevents unexpected legal disputes, operational disruptions, and reputational damage after the transaction is complete.
5. Walk away from high-risk deals before it’s too late.

Legal due diligence empowers you to make smart, strategic decisions - not just spot red flags.

What should you pay attention to before buying a company?

Before investing in or acquiring a company, it’s crucial to look beyond the surface. Legal due diligence helps reveal risks that could impact the deal - from hidden debts to legal disputes or tax issues.

To make a well-informed decision, focus on these key areas:

1. Detailed document analysis. Check corporate documents (charter, shareholder agreements, board minutes) to verify ownership, management, and legal structure.
2. Evaluation of tax risks. Review tax filings, audit reports, and compliance with local and international tax laws to spot hidden liabilities.
3. Litigation and legal disputes. Identify ongoing or past lawsuits, regulatory actions, or unresolved claims that could affect the company’s value or future. Litigation and legal disputes can have a significant impact on a company's financial health and reputation. Identify ongoing or past lawsuits, regulatory actions, or unresolved claims that could affect the company’s value or future. Failing to assess litigation risks properly may lead to unexpected liabilities and legal disputes that could harm investor confidence.

Detailed document analysis

During legal due diligence, experts review essential documents to understand how the company is structured and managed.

What to review:

• Articles of Association – show how the company is organized.
• Shareholder Agreements – outline investor rights and obligations.
• Board Meeting Minutes – reveal key decisions and how they were made.
• Records of Share Capital & Management Changes – track ownership and leadership history.

Why it matters:

• Missing or inconsistent documents can mean legal risks or internal conflicts.
• Clear, complete records confirm the company is properly managed and legally compliant.

Evaluation of tax risks

Legal due diligence includes verifying the company’s tax compliance, accuracy of tax filings, and any history of disputes with tax authorities. Key risks include unpaid taxes, ongoing or past litigation, and the use of aggressive tax schemes that could trigger audits or fines.

1. Check passed if: the company has filed taxes on time, paid all due amounts, and has no unresolved disputes with tax authorities.
2. Check failed if: there are signs of unpaid taxes, pending investigations, or the use of questionable tax planning methods.

Understanding a company’s tax obligations and potential liabilities is essential for investors and stakeholders. At Key2Law, our taxation services provide businesses with tailored solutions to minimize tax risks, ensure compliance, and optimize financial planning. Clients benefit from expert guidance on tax structuring, risk mitigation strategies, and support in handling tax audits and disputes.

Role of litigation and legal disputes in due diligence

Key questions addressed by this section:

1. Does the company have any past or ongoing litigation?
2. Are there unresolved commercial disputes that could impact operations?
3. Has the company faced claims related to intellectual property, employees, or regulatory compliance?
4. What financial or reputational risks do these disputes pose to investors?
5. How could the outcome of pending legal cases affect the company’s valuation and stability?

When evaluating a company for investment or acquisition, assessing its legal history is crucial. Any ongoing or past litigation whether lawsuits, commercial conflicts, or regulatory investigations can pose financial and operational risks. Disputes over intellectual property rights, employee claims, or contract breaches can lead to costly settlements or penalties.

Unresolved legal issues can be a red flag, indicating potential liabilities that may impact the company’s profitability and future growth. Investors must consider the possible financial consequences and reputational damage from ongoing disputes. By reviewing court records, arbitration cases, and compliance reports, legal experts can provide a comprehensive risk assessment, helping investors make informed decisions.

Why corporate structure matters in due diligence

Key questions addressed by this section:

1. What is the company's ownership structure, and are there any complexities?
2. Are shareholder agreements clear and legally sound?
3. Do any restrictions exist on the transfer of shares?
4. Are there rights of first refusal, drag-along, or tag-along rights that could affect future transactions?
5. Could any inconsistencies in corporate structure cause delays or disputes?

A company’s corporate structure plays a crucial role in legal due diligence. Experts review ownership details, shareholder agreements, and any contractual restrictions on share transfers. If provisions like rights of first refusal, drag-along, or tag-along rights are unclear or inconsistent, they can create complications during an acquisition.

A well-structured corporate framework ensures transparency, preventing potential disputes that could delay or derail a deal. Investors should address any ownership complexities early to facilitate a smooth transaction. For further insights into the significance of shareholder agreements in business transactions, read our article on Understanding the Importance of Shareholder Agreements (SHA).

Potential red flags you may find during legal due diligence

Potential red flags during legal due diligence include: 

• unresolved legal disputes - pending lawsuits, regulatory investigations, or past legal violations that could result in financial liabilities or reputational damage;
• regulatory non-compliance - failure to comply with financial, tax, employment, or industry-specific regulations, leading to potential fines, penalties, or operational restrictions;
• irregularities in corporate governance - lack of transparency in decision-making, conflicts of interest, or deviations from statutory requirements in board meetings and shareholder agreements;
• inconsistent financial records - discrepancies in financial statements, hidden liabilities, or irregular transactions that raise concerns about financial stability;
• deficient intellectual property protections - lack of proper IP registrations, pending disputes over trademarks or patents, or unauthorized use of third-party IP;
• employment and labor issues - violations of labor laws, high employee turnover, or unresolved disputes related to contracts, wages, or benefits;
• undisclosed liabilities or debt - unreported loans, unpaid tax obligations, or off-balance-sheet commitments that may impact financial health;
• data protection and cybersecurity risks – non-compliance with GDPR or other data privacy regulations, history of data breaches, or inadequate cybersecurity measures;
• high dependency on key individuals - a company overly reliant on a few key executives or founders, with no clear succession or contingency plans;
• opaque or high-risk business relationships - unclear ownership structures, involvement with sanctioned entities, or dependency on a single supplier or client.

These issues can significantly affect a company’s value or jeopardize the investment. Identifying them helps investors assess whether to proceed with the deal or walk away.

Contact Key2Law for conducting due diligence

Key2Law team has extensive experience in conducting due diligence across a wide range of industries and jurisdictions. We provide our clients with detailed, actionable insights that support confident investment decisions. Our services are tailored to each transaction, focusing on what matters most: minimizing risk, protecting value, and enabling success.

If you are considering investing in or acquiring a company, reach out to us today. We will guide you through the due diligence process with precision and discretion, ensuring that your investment is built on a solid legal foundation.