Buyer due diligence is the most important phase of an M&A deal after the LOI. It is where deals die, where prices get re-traded, and where smart sellers protect the value their advisor negotiated. Understanding what buyers look for, and how to prepare, is the difference between a clean close and a painful one.
What diligence actually covers
The major streams in any meaningful M&A diligence:
- Financial diligence (QoE). Validating reported financials, normalizing adjustments, projecting forward. This is where re-trades originate most often.
- Legal diligence. Contracts, IP, employment, litigation, corporate structure.
- Commercial diligence. Market, competition, customer concentration, growth trajectory.
- Technical diligence. Architecture, technical debt, security, scalability.
- HR diligence. Key person risk, compensation structures, equity overhang, cultural fit.
- Tax diligence. Tax structure, transfer pricing, state and local tax exposure.
- Regulatory and compliance. License inventory, regulatory examinations, AML/KYC posture (for payments).
What diligence reveals about financial risk
Buyers calibrate offer price based on three financial discoveries:
- Revenue quality. Recurring versus one-time, customer concentration, churn risk.
- Margin sustainability. Whether reported margins reflect long-term reality or temporary advantages.
- Working capital and cash conversion. How much of "EBITDA" actually becomes cash.
Surprises in any of these areas trigger price reductions. Pre-empt by surfacing them upfront and addressing in the LOI.
What diligence reveals about growth potential
Buyers also use diligence to validate (or invalidate) the growth narrative:
- Customer cohort analysis: are new customers behaving like older ones?
- Pipeline conversion: is the named pipeline realistic?
- Market analysis: is the TAM as defined real?
- Competitive positioning: are wins durable or just timing-dependent?
What diligence reveals about structure
Diligence findings also shape deal structure. Heavier diligence findings often produce:
- Larger earnouts to bridge risk
- Indemnification carve-outs for specific issues
- Holdback escrows for unresolved items
- Rep and warranty insurance to backstop disclosures
How sellers prepare
The best preparation is to run diligence on yourself before the buyer does. Engage a QoE accountant 6-9 months before going to market. Inventory contracts. Address known issues. Build a buyer-ready data room. The work pays for itself many times over in retained deal value.