The Advantages of Vendor Due Diligence

What Is Vendor Due Diligence?

Selling a well-prepared business is not the same as simply putting a business up for sale. Vendor Due Diligence is the tool that puts the seller in control of the process: whoever controls the information, controls the negotiation.

A Vendor Due Diligence (VDD) is a comprehensive analytical process commissioned by the seller itself prior to launching the sale of its business. Unlike a traditional due diligence — in which it is the buyer who investigates the target — a VDD is a proactive initiative by the owner, aimed at anticipating issues, resolving them before they surface during negotiations, and bringing the business to market in the best possible condition.

The scope of a VDD can cover all relevant areas of the business: financial, tax, employment, legal, and so on — depending on the nature of the company and the expected sophistication of prospective buyers. The output is an independent report — prepared by reputable advisers appointed by the seller — which is provided to potential acquirers during the process, reducing the information asymmetry inherent in any M&A transaction.

VDD vs. Buy-Side Due Diligence: Key Differences

Both processes share the same methodology, but their perspective, purpose and consequences are fundamentally different:

The practical difference is decisive: in a buy-side DD, every adverse finding automatically becomes an argument for reducing the purchase price, requesting additional protections (indemnities, escrow) or walking away. In a VDD, those same findings are identified months in advance — the seller remediates or contextualises them, and enters the negotiation without exposed flanks.

Types of Vendor Due Diligence

A VDD is structured across different workstreams, activated according to the characteristics and sector of the business:

The VDD Process and Phases

A well-executed VDD follows a structured process that typically unfolds across four phases:

1. Scope definition and selection of the advisory team. The seller, together with its M&A adviser, determines which areas the VDD will cover. Independent, best-in-class advisers are selected for each discipline. Independence is critical to ensure the report carries credibility with prospective buyers.
2. Information gathering and analysis. Advisers access documentation through a Virtual Data Room (VDR). Historical financial statements (3–5 years), contracts, tax structures, headcount data and commercial positioning are reviewed. This phase typically takes 6–10 weeks.
3. Identification of findings and remediation plan. Advisers present their findings to the seller prior to drafting the final report. The seller has the opportunity to remediate contingencies, reorganise tax structures, resolve minor litigation, or prepare appropriate explanations for each finding.
4. Preparation and distribution of the final report. The VDD report is shared with prospective buyers under NDA. In competitive processes, it dramatically reduces the time each buyer requires to complete their own diligence. Advisers remain available for Q&A sessions.

Advantages of Vendor Due Diligence for the Seller

• Prevents price chipping: By identifying and resolving contingencies ahead of the process, the seller eliminates the buyer's grounds for reducing the purchase price or imposing post-closing adjustment mechanisms.
• Maximises enterprise value: The financial VDD identifies the key value creation levers — normalised EBITDA, quality of earnings, optimal capital structure and FCF — presenting the business in its strongest quantitative form.
• Limits post-closing warranties and liabilities: Reduces the scope of warranties and indemnities the buyer can demand, and minimises the need for escrow arrangements or price retention mechanisms.
• Accelerates the sale process: With information already organised and verified, buyers can complete their analysis in weeks rather than months.
• Strengthens negotiating power: A seller backed by a robust VDD report conveys credibility and professionalism, reducing the information asymmetry that typically favours the buyer.
• Optimises the tax structure: Enables the business to be restructured for tax efficiency prior to completion — group reorganisations, capital gains optimisation, shareholder tax planning.
• Facilitates competitive processes: In multi-bidder auctions, a VDD levels the playing field: all parties work from the same information base, making bids more directly comparable.
• Value beyond the transaction: Even if no sale ultimately occurs, the process identifies the principal risks and opportunities within the business — a high-quality management exercise in its own right.

The optimal timing for conducting Vendor Due Diligence (VDD) depends on the company’s specific characteristics and the complexity of the potential transaction. Ideally, it should be initiated up to two years prior to the target disposal date to prevent the emergence of new contingencies. A lead time of at least six months before the sale is also advisable, ensuring sufficient time to remediate any identified deficiencies.

While primarily performed in anticipation of a future exit, VDD is also an effective tool for maintaining operational and financial hygiene. It identifies key issues and risks well in advance, allowing the firm to eradicate or mitigate them as much as possible. Furthermore, it prevents unforeseen deal issues and contentious negotiations regarding purchase price adjustments or restrictive contractual clauses imposed by the buyer as a reaction to their own risk identification.

Common Mistakes to Avoid

• Commissioning the VDD too late, leaving insufficient time to act on the findings.
• Selecting advisers who lack genuine independence or have conflicts of interest — this undermines the report's credibility with the buyer.
• Restricting the scope to conceal problematic areas. The buyer will identify these in their own DD, and the effect will be worse.
• Failing to update the report if more than 12 months pass between its preparation and transaction closing.
• Overlooking the commercial and ESG workstreams, which are increasingly decisive for institutional buyers and Private Equity funds.
• Failing to coordinate the VDD advisory team with the M&A adviser, generating contradictory messages to the market.

Conclusion

The seller’s M&A advisor plays a central coordinating role throughout the VDD process. They act as the coordinator of the entire process:

• They define the scope of each VDD workstream based on the profile of the target buyer and the perceived risks.
• They coordinate timing and communication among the different advisory teams (financial, tax, legal, and labor).
• They filter and contextualize the findings before they are reflected in the final report, distinguishing between issues that should be remediated and those that should be explained.
• They incorporate the VDD findings into the Information Memorandum (IM) and the overall sale narrative.
• They manage Q&A sessions with potential buyers regarding the content of the report, while maintaining control of the process.

Vendor Due Diligence is a highly advisable process for any company planning a future sale. It not only facilitates and accelerates the transaction process, but also materially improves sale terms, gives the seller greater certainty and negotiating leverage, and minimizes unpleasant surprises in the final stages of the negotiation.

This process entails a cost, but that cost is not material in the context of a corporate transaction. The return on investment can be substantial if it enables a successful, efficient transaction with minimal risk for the seller.

“Selling well is not a matter of luck. It is a matter of preparation. Vendor Due Diligence is the first step in that preparation.”

Are you considering selling your company?

At Maraz Corporate Finance, we help clients prepare for and execute the sale process with the highest level of professionalism. Vendor Due Diligence is the first step toward a successful transaction.

Javier de Rojas Roca de Togores

Partner - Maraz Corporate Finance