Buy-side financial due diligence is commissioned by the acquirer and focuses on validating what they are buying, while sell-side financial due diligence is commissioned by the seller and focuses on presenting the business in a transparent, deal-ready way. The core difference lies in who holds the mandate and what outcome they are working toward. The sections below unpack each process in detail, from scope and outputs to timing and deal impact.

Who commissions buy-side vs. sell-side financial due diligence?

Buy-side financial due diligence is commissioned by the buyer or acquirer, typically with support from their advisors, to independently verify the financial position of the target company before committing capital. Sell-side financial due diligence, also called vendor due diligence (VDD), is commissioned by the seller, who proactively prepares a report to share with prospective buyers during the sale process.

In a buy-side process, the buyer’s management team, private equity sponsor, or corporate development function engages an independent financial advisor or accounting firm to conduct the review. The mandate is clear: protect the buyer’s interests by identifying risks, validating assumptions, and confirming that the business is what it appears to be.

In a sell-side process, the seller takes the initiative. They engage advisors early, often before formally launching the sale, to produce a report that accelerates buyer confidence and reduces friction in the later stages of a deal. The report is addressed to the seller but made available to buyers, who typically rely on it rather than commissioning a fully independent parallel exercise.

What does buy-side financial due diligence typically examine?

Buy-side financial due diligence examines the quality of earnings, working capital dynamics, net debt position, and the sustainability of the target’s financial performance. The goal is to give the buyer a clear, independent picture of what the business actually earns and what financial risks come with the acquisition.

A buy-side review typically covers the following areas:

• Quality of earnings (QoE): Adjusting reported profits to remove one-off items, non-recurring revenues, and management adjustments, leaving a normalized EBITDA that reflects the true run-rate of the business.
• Working capital analysis: Establishing a normalized working capital level and identifying any seasonal peaks, management of payables, or revenue recognition practices that could affect the post-closing cash position.
• Net debt and debt-like items: Identifying all financial obligations that affect the equity value, including pension liabilities, lease commitments, deferred revenues, and contingent liabilities.
• Revenue and customer analysis: Assessing concentration risk, contract terms, churn rates, and the reliability of the revenue base going forward.
• Historical financial trends: Reviewing three to five years of financial data to identify patterns, inconsistencies, or deterioration that management projections may not reflect.

The findings feed directly into the buyer’s pricing model, the representations and warranties in the sale and purchase agreement, and any price adjustment mechanisms agreed at closing.

What does sell-side financial due diligence focus on?

Sell-side financial due diligence focuses on presenting the business’s financial performance accurately, proactively addressing likely buyer concerns, and producing a report that supports a smooth, efficient sale process. It covers much of the same ground as a buy-side review, but the framing and purpose differ.

The seller’s advisors prepare a vendor due diligence report that explains the business’s earnings quality, working capital profile, and financial history from the seller’s perspective. Rather than searching for hidden risks on behalf of a buyer, the process is about surfacing issues early, addressing them transparently, and preventing surprises from derailing negotiations at a late stage.

Sell-side due diligence also tends to place greater emphasis on the business’s growth story, the sustainability of its margins, and the robustness of its financial reporting systems. Sellers want buyers to arrive at a high-quality earnings figure that supports the asking price, and a well-prepared VDD report helps anchor that conversation.

One important distinction: sell-side reports are typically prepared under a reliance letter framework, meaning buyers can rely on the report for a defined purpose, but the advisors’ primary duty of care remains with the seller. This is why sophisticated buyers in large transactions sometimes commission a supplementary buy-side review on top of the VDD.

How do the outputs and reports differ between the two processes?

Buy-side reports are private, addressed solely to the buyer, and written to protect the buyer’s interests by highlighting risks and uncertainties. Sell-side reports are shared with multiple prospective buyers, written to support the seller’s process, and designed to build buyer confidence.

The structural differences between the two types of reports reflect their different audiences and purposes:

• Addressee and confidentiality: Buy-side reports are strictly confidential to the buyer and their funders. Sell-side reports are distributed to a defined group of bidders under non-disclosure agreements.
• Tone and framing: Buy-side reports tend to be more skeptical in tone, flagging risks and open items. Sell-side reports are more balanced, presenting the business fairly while addressing known issues head-on.
• Scope of reliance: Buyers can rely on their own buy-side report without restriction. Reliance on a vendor due diligence report is governed by the terms of the reliance letter, which typically caps the advisor’s liability.
• Timing of delivery: Buy-side reports are delivered to the buyer before signing or as a condition to closing. VDD reports are typically made available in the data room during the bidding phase, often before exclusivity.

When should a seller commission vendor due diligence?

A seller should commission vendor due diligence early in the sale preparation process, ideally three to six months before formally launching the transaction to the market. Starting early gives the seller time to identify and resolve financial issues before buyers discover them independently.

Commissioning a VDD report makes the most sense in the following situations:

• The business has complex financial reporting, multiple revenue streams, or a history of acquisitions that make earnings difficult to read at a glance.
• The seller expects multiple bidders and wants to run an efficient, competitive process without each buyer conducting a full independent review in parallel.
• The seller wants to reduce deal execution risk by controlling the narrative around earnings quality and working capital.
• The transaction involves private equity buyers, who are experienced at identifying weaknesses in financial information and will conduct rigorous scrutiny regardless.
• The seller wants to support a higher valuation by providing a credible, independently prepared earnings figure that buyers can rely on.

In straightforward transactions with a single buyer and limited complexity, a full vendor due diligence report may be unnecessary. In those cases, a well-organized financial data room and responsive management can achieve a similar result. However, for competitive auction processes, the VDD report is a standard and expected part of the seller’s preparation.

How does the choice between buy-side and sell-side due diligence affect deal outcomes?

The choice of who commissions financial due diligence directly affects deal speed, price certainty, and the allocation of risk between buyer and seller. Both processes ultimately serve the same transaction, but they shape the negotiation dynamic in different ways.

When a seller provides a strong vendor due diligence report, buyers can move faster, submit more confident bids, and reduce the scope of their own independent review. This typically results in a tighter timeline from indicative offer to signing, fewer price chips during final negotiations, and a smoother closing process.

When a buyer conducts thorough buy-side financial due diligence without a VDD in place, the process tends to take longer. Buyers may uncover issues that were not visible in the information memorandum, leading to price adjustments, additional representations in the sale agreement, or in some cases, a decision to withdraw entirely.

The interplay between the two processes also affects the legal protections built into the transaction. A buyer who has conducted their own independent review is better positioned to negotiate specific indemnities and warranty coverage tied to identified risks. A buyer relying primarily on a VDD report will typically negotiate broader warranty and indemnity insurance coverage to compensate for the more limited scope of their own investigation.

In cross-border transactions, where regulatory complexity and accounting differences add further layers of uncertainty, the quality of financial due diligence on both sides becomes even more consequential. Our trust and corporate services work supports clients navigating exactly these kinds of multi-jurisdictional structures, where financial clarity and proper corporate governance are inseparable from deal success.

How Kiltoprak helps with financial due diligence

We work with international investors, corporate buyers, and private clients who need experienced guidance through the financial due diligence process, whether they are acquiring a business, preparing a company for sale, or structuring a cross-border transaction. Our team combines corporate finance expertise with deep knowledge of European regulatory environments, giving clients a practical advantage when deals involve multiple jurisdictions.

Here is what we offer in the context of financial due diligence:

• Buy-side support: We help buyers define the scope of their financial review, coordinate with specialist advisors, and interpret findings in the context of deal structure and valuation.
• Sell-side preparation: We support sellers in organizing their financial data, identifying potential buyer concerns in advance, and preparing the documentation that underpins a credible vendor due diligence process.
• Cross-border structuring: We advise on the corporate and financial structures that affect how due diligence is conducted across multiple jurisdictions, including the Netherlands, Switzerland, Sweden, and Türkiye.
• Coordination with institutional counterparties: Through our established relationships with banks, legal advisors, and regulatory bodies, we help clients manage the full transaction process efficiently.

You can learn more about our services and how we support clients across corporate finance and related advisory work. Wil je weten hoe we jullie kunnen ondersteunen bij financial due diligence? Lees meer over onze organisatie en maak kennis met ons managementteam. Neem contact met ons op om te bespreken wat we voor jullie kunnen betekenen.