Vendor / sell-side due diligence: a primer for first-time sellers.
Our FDD practice, in detail.
1. Why vendor DD matters.
A first-time seller usually responds to the buyer's diligence. The buyer asks; the seller produces; the buyer adjusts; the seller defends. The process puts the seller on the back foot from day one, and the buyer's diligence findings drive the negotiation.
Vendor due diligence inverts the sequence. The seller commissions a buy-side-quality FDD on themselves before any buyer engages, and provides the resulting pack to bidders early in the process. The pack establishes the financial narrative the buyer will work from. Where the buyer's own diligence later finds the same items, those items are already disclosed and defended; where the buyer finds something new, the seller's transparency on the disclosed items makes the new finding more credible to negotiate.
The economics are simple. A well-prepared vendor DD pack typically saves the seller several percentage points on the headline price (because the buyer pays for transparency) and weeks of negotiation calendar (because most diligence questions are answered before they are asked).
2. What the vendor DD pack contains.
A vendor DD pack mirrors a buy-side FDD report in structure but is positioned for buyer consumption:
- Executive summary. The business in two pages, with the headline financial numbers and the key adjustments already identified.
- Quality of earnings bridge. Reported EBITDA, adjustments, adjusted EBITDA - same format as a buy-side QoE.
- Working capital analysis. The 12-month trailing average, seasonality-adjusted where relevant, with the proposed target.
- Net debt and debt-like items schedule. Every item the seller has identified, classified and quantified.
- Disclosure schedule. Known issues that a buyer's diligence would find, disclosed pre-emptively with the seller's view and supporting documentation.
- Tax position summary. Open assessments, pending appeals, contingent positions, transfer-pricing approach.
- Related-party transactions schedule. All RPTs above a threshold over the look-back, with rationale and approval evidence.
- Customer and supplier concentration analyses. The buyer will ask; the seller answers in advance.
3. When to engage it.
The vendor DD is engaged after the seller has decided to pursue a transaction but before any buyer has been approached. The typical sequence:
- Months 1 to 2: vendor DD performed.
- Month 3: information memorandum drafted, vendor DD pack finalised.
- Months 4 to 6: outreach to bidders, NDAs signed, vendor DD pack shared with shortlist.
- Months 7 to 9: confirmatory buyer-side diligence (faster because vendor pack does the heavy lifting).
- Months 10 to 12: SPA negotiation and closing.
The vendor DD pack typically remains useful for 6 to 9 months. Beyond that, the underlying financials have aged and the pack needs a refresh.
4. How it differs from buy-side.
Same investigative discipline, different positioning. Three meaningful differences:
- Comprehensiveness. Vendor DD goes wider than a typical buy-side FDD because the seller cannot predict what each potential buyer will focus on. Buy-side FDD goes deeper on the specific issues the acquirer cares about, with narrower scope.
- Tone. Vendor DD is positioned for buyer consumption: clear, balanced, professionally cautious. Buy-side FDD is positioned for an acquirer's deal team: red flags up front, no diplomatic softening.
- Disclosure orientation. Vendor DD pre-discloses issues so the seller controls how they are framed. Buy-side FDD discovers issues and frames them around their commercial impact.
5. Buyer acceptance, in practice.
Sophisticated buyers (PE funds, strategic acquirers with M&A teams) accept vendor DD packs as a primary diligence input and then run a "top-up" confirmatory diligence focused on:
- The latest period (refreshing the data to current).
- Items the buyer specifically values (synergy assumptions, customer interviews, supplier interviews).
- Areas where the buyer wants independent comfort (forensic checks, specific tax positions).
Less experienced buyers may insist on a full independent diligence regardless of the vendor pack. Even then, the vendor pack accelerates their work and establishes a baseline that the buyer cannot easily move away from without justification.
6. Notes for first-time sellers.
Three things first-time sellers under-invest in:
- Clean financials, on time. The vendor DD relies on management accounts that close cleanly within 15 days of month-end. If your close cycle is 45 days, fix the close before the diligence, not during.
- A defensible related-party schedule. All RPTs above the threshold, with rationale, approval evidence and pricing benchmark. If the schedule is patchy, the buyer will treat the entire RPT history as exposure.
- A frank conversation with the FDD firm. The vendor DD firm needs to know about the issues you are aware of (and the ones you are uncertain about) so they can be properly disclosed. Surprises in the buyer's confirmatory diligence are far more costly than disclosed items.
The investment is meaningful but the return is reliable: tighter deal, faster close, cleaner SPA.
Frequently asked
Does a vendor DD bind the seller to the disclosed positions?
It does not constitute a contractual representation. The vendor DD is provided as information; the binding representations and warranties are in the SPA. However, items disclosed in the vendor DD typically become carve-outs from the seller's reps and warranties (the buyer cannot claim ignorance of disclosed items), and undisclosed items can give rise to indemnity claims.
How much does vendor DD cost relative to buy-side?
Vendor DD typically costs 1.0 to 1.5 times what a comparable buy-side FDD would cost, because the scope is wider. For a mid-sized target, expect the vendor DD pack to cost ₹15 to 40 lakhs depending on the size and complexity of the target and the comprehensiveness of the pack.
Who can perform vendor DD - can our existing auditor do it?
Auditor independence rules typically prevent the same firm from providing both audit and consulting services beyond the permitted thresholds. Vendor DD is usually engaged from a firm other than the statutory auditor, often the firm that the seller separately uses for internal audit, tax advisory or M&A support.
Will buyers actually rely on the vendor DD pack?
Sophisticated buyers do rely on it, run their confirmatory diligence in 2 to 3 weeks instead of 4 to 6, and treat the disclosed items as established. Less experienced buyers may run a full parallel diligence regardless, but even they accelerate from the pack.
Can the vendor DD pack be shared with strategic buyers who are competitors?
Most vendor DD engagements include an NDA arrangement that allows controlled sharing with shortlisted bidders. Strategic competitors are usually given access to a redacted version (customer names anonymised, supplier names redacted, sensitive pricing summarised). The information memorandum and the data room operate alongside, with deeper access granted as bidders progress.
