What Is Vendor Due Diligence?
Vendor due diligence (VDD) is a comprehensive investigation of a target company commissioned by the seller (rather than the buyer) ahead of a sale process. Conducted by independent advisors — typically accounting firms, law firms, and specialist consultants — VDD produces detailed reports that are made available to prospective buyers, reducing the need for each buyer to conduct its own full-scope due diligence from scratch.
VDD has become standard practice in competitive auction processes, particularly in private equity-backed exits, where the seller wants to maximise deal certainty, accelerate the timeline, and control the information flow.
How It Works
Scope
VDD typically covers the same areas as buyer-side due diligence:
| Workstream | Provider | Key Areas |
|---|---|---|
| Financial VDD | Big Four / mid-tier accounting firm | Quality of earnings, normalisation adjustments, working capital analysis, net debt |
| Tax VDD | Tax advisory firm | Tax compliance, positions, structuring, exposures |
| Commercial VDD | Strategy consultant | Market position, competitive landscape, growth drivers |
| Legal VDD | Law firm | Material contracts, litigation, regulatory, employment |
| IT / Technology VDD | Specialist consultant | Systems, cybersecurity, technical debt |
| ESG VDD | ESG consultant | Environmental, social, governance risks and opportunities |
Process
- Appointment — seller engages independent advisors (typically 3-6 months before launch)
- Investigation — advisors conduct comprehensive due diligence with full management access
- Draft reports — reports reviewed with management and seller’s advisors for accuracy
- Final reports — completed reports placed in the data room for buyer access
- Reliance letters — buyers receive reliance letters allowing them to rely on the VDD reports
- Buyer top-up — buyers conduct targeted additional diligence to address VDD gaps or specific concerns
Benefits and Drawbacks
Benefits for the Seller
| Benefit | Impact |
|---|---|
| Issue identification | Discovers and addresses problems before buyers find them |
| Process control | Seller manages the narrative around identified issues |
| Timeline acceleration | Buyers need less time for their own diligence |
| Competitive tension | More buyers can participate (lower individual diligence cost) |
| Price protection | Issues are factored into management’s expectations, reducing chip risk |
Benefits for Buyers
- Immediate access to independent, professional analysis
- Faster assessment of the opportunity
- Reduced diligence costs (though buyers still need their own advisors to review VDD)
- Standardised information across all bidders
Drawbacks
- Cost — VDD programs cost $500,000 to $3 million+ depending on complexity
- Seller bias — though conducted by independent firms, the seller influences scope and framing
- Reliance limitations — buyers may not fully rely on VDD reports without their own verification
- Staleness — VDD conducted months before closing may need updating
According to PwC’s M&A Integration Survey, vendor due diligence is used in approximately 60-70% of PE-backed exit processes in Europe and increasingly in APAC markets.
APAC Context
Australia — VDD is well-established in Australian M&A, particularly for PE exits and mid-market transactions. Financial VDD (quality of earnings, working capital) is most common, with commercial VDD increasingly standard for larger processes. Australian VDD reports typically follow the same standards as UK practice.
Japan — VDD adoption in Japan is growing as PE-backed exits increase and international buyers expect standardised diligence packages. Japanese VDD processes may include additional focus areas such as labour compliance and business custom review, reflecting the unique aspects of Japanese corporate practice.
India — VDD is becoming more common in Indian M&A, particularly for transactions involving international buyers or PE exits. Indian VDD processes often include heightened focus on tax compliance, regulatory approvals, and related-party transactions, reflecting the areas of greatest buyer concern.
“Vendor due diligence transforms the sale process from reactive to proactive — the seller controls the narrative and sets the pace,” notes Daniel Bae, founder of Amafi. “In APAC, where information standards vary across markets, VDD provides the standardised foundation that international buyers expect.”
Preparing for a sale process across Asia Pacific? Amafi helps companies and investors manage due diligence and deal execution. Learn more.