What is a Financial Due Diligence Questionnaire?

It assesses balance sheets, margins, cash flow, debt, and financial risks of the target company.

What is a Legal Due Diligence Questionnaire?

It focuses on contracts, litigation, intellectual property, and contractual compliance.

What is a Tax Due Diligence Questionnaire?

It examines tax filings, at-risk financial positions, and potential audits or reassessments.

What is a Commercial Due Diligence Questionnaire?

It analyzes the market, customer trends, pipeline health, and competitive positioning to ensure future revenue growth.

What is an Operational Due Diligence Questionnaire?

It evaluates business processes, supply chain stability, and operational key dependencies.

What is an IT and Cybersecurity Due Diligence Questionnaire?

It reviews technology architecture, data protection policies, and security certifications.

What is an HR and Employment Due Diligence Questionnaire?

It investigates the team structure, key skills retention, and labor relations.

What is an ESG and Regulatory Due Diligence Questionnaire?

It assesses sustainability metrics, environmental compliance, and sector-specific statutory obligations.

Commercial Due Diligence

What is a Vendor Due Diligence (VDD)?

Par Weburst

9 Juillet 2026

Selling your company means accepting that it will be put under the microscope. Rather than submitting to the buyers’ revenue audit, a growing number of leaders are choosing to take back control by commissioning a vendor due diligence themselves. This independent audit, carried out before going to market, secures the transaction, speeds up the sale, and protects the valuation.

In this article, discover everything you need to know about Vendor Due Diligence and download our checklist to prepare your own!

Download our checklist

Vendor due diligence: definition

A vendor due diligence (VDD) is an independent audit commissioned by the seller of a company ahead of its disposal. Unlike a standard due diligence, which is conducted by the buyer, it is carried out on the initiative and under the direction of the seller.

Its purpose: to provide potential buyers with a complete and objective assessment of the company, documented by independent experts. Put simply, the seller has their own company audited in order to present a solid case, anticipate questions, and inspire confidence from the outset.

VDD vs acquisition due diligence: what are the differences?

Acquisition due diligence (buy-side) is conducted by the buyer after the letter of intent, to validate their purchase. Vendor due diligence, on the other hand, is initiated upstream by the seller, for the benefit of all potential buyers.

	Seller-led Option A Vendor due diligenceVDD — seller's initiative	Option B Acquisition due diligenceBuy-side — buyer's initiative
Who initiates it	The seller	The buyer (buy-side)
Objective	Prepare the disposal, reassure buyers and accelerate the process.	Verify the target before buying.
Timing	Before going to market.	After the letter of intent.
Report beneficiary	All potential buyers.	The single buyer.

Why carry out a vendor due diligence?

First seen in transactions involving investment funds, the VDD has become common practice. For the seller, it combines several decisive advantages:

Take back control

The VDD allows you to identify and fix problem areas (tax risk, customer dependency, etc.) before buyers exploit them in negotiations.

Maximize the valuation

A prepared and secured case limits downward price adjustments and unfavorable warranty clauses.

Accelerate and secure the disposal

By providing complete information from the start, the VDD shortens the buyers' due diligence and reduces the risk of a "deal break."

Distribute consistent information

All candidates receive the same verified data, which puts the seller in a position of strength within a structured process.

Protect management

By concentrating the audit effort upstream, the sale process doesn't monopolize the leadership team or disrupt day-to-day operations.

What does a vendor due diligence contain?

A VDD is a multi-disciplinary diagnostic. Depending on the size and sector of the target, the main areas of vendor due diligence are:

Financial (financial statements, margins, cash flow, debt),
Legal (contracts, litigation, intellectual property),
Tax (filings, reassessment risks),
Employment (employment contracts, labor relations),
Operational and commercial (customers, market, positioning).

In practice, the vast majority of VDDs offered by firms stop at the financial and accounting component. Yet that is rarely where the valuation of a growth company is decided!

Commercial VDD: the angle that maximizes your valuation

A financial VDD proves that past figures are reliable. But a buyer is paying for the future! In particular, for whether revenue will hold and grow after the takeover. That is exactly what a commercial vendor due diligence demonstrates.

By objectifying revenue recurrence, customer retention, pipeline health, and dependence on a few accounts or on a single leader, the commercial vendor due diligence proves that growth is solid and replicable.

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How does a vendor due diligence unfold?

The process takes place in three stages:

The seller first prepares their data room: they gather and organize the documents (financial, legal, contracts, HR) in a secure space.
Independent third parties (audit firms, lawyers, or consultants) then carry out the in-depth analysis.
The findings are recorded in a vendor due diligence report that presents the target's historical and forecast performance.

Generally allow a few weeks, depending on the size of the company.

Note: the VDD does not exempt the buyer from conducting their own due diligence, but it significantly reduces its scope and duration.