📅 July 2026⏱️ 12 min read👥 Deal teams & M&A professionals
6
Phases from screen to close
60–120
Days post-LOI to close
$50K–$250K
Typical advisory cost
50–70%
Deals that close after LOI
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Traditional M&A diligence runs $50K–$250K across phases. Use a $49 public-info pack for target screening and reserve expensive advisors for confirmatory DD.
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M&A Due Diligence: Process Overview
Mergers and acquisitions due diligence is the structured investigation a buyer conducts to verify that a target company is worth acquiring — and at what price. The process has evolved from a single "due diligence" phase into six distinct phases, each with different goals, participants, and deliverables.
The biggest mistake deal teams make is treating all diligence as one block. In reality, the early phases (screening and preliminary diligence) are about deciding whether to pursue a deal, while the later phases (confirmatory diligence) are about refining the price and terms. The cost difference is massive: you can screen 20 targets for the price of one confirmatory diligence engagement.
Here's how the 6 phases connect:
Phase 1: Target Screening
01
Pre-Contact · Public Data
Target Identification & Initial Screen
Before contacting anyone, the deal team builds a target list and screens each company using public data. The goal: eliminate obvious non-fits before spending time or money.
- Define acquisition criteria (sector, revenue range, geography, EBITDA margin)
- Build a longlist of 30-100 targets from databases, industry maps, and broker networks
- Screen each target for basic fit: size, ownership type, growth trajectory
- Pull public financials, litigation records, regulatory filings, and news
- Identify 10-15 targets worth deeper investigation
- Flag deal-killing red flags (declining revenue, legal exposure, key-person risk)
⏱️ Timeline: 2-6 weeks traditional · <1 day with proprietary-algorithm screening
Phase 2: Preliminary Due Diligence
02
Pre-LOI · CIM + Public Data
Deep Screen Before Committing to an LOI
Once the shortlist is built, the deal team conducts preliminary diligence — also called pre-LOI diligence. This is where the buyer decides whether to make an approach, sign an NDA, and pursue an LOI.
- Sign NDA and receive the Confidential Information Memorandum (CIM)
- Review CIM claims against public data (revenue, market position, competitive landscape)
- Conduct preliminary financial analysis (revenue trends, margins, customer concentration)
- Screen for litigation, regulatory, and ESG risk signals
- Assess management team strength and key-person dependency
- Validate the investment thesis — does this target actually solve the strategic problem?
- Decide: pursue with an LOI, pass, or continue monitoring
⏱️ Timeline: 1-4 weeks traditional · <1 hour with proprietary-algorithm reports
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Phase 3: LOI & Exclusivity
03
Negotiation · Legal
Letter of Intent and Exclusivity Period
The buyer submits a non-binding Letter of Intent outlining proposed price range, structure, and timeline. If the seller accepts, a 60-90 day exclusivity period begins — during which the seller cannot engage other buyers.
- Draft and negotiate LOI terms (price range, structure, conditions)
- Establish exclusivity period (typically 60-90 days)
- Define diligence timeline and deliverable list
- Engage deal advisors (legal counsel, QoE provider, tax, IT)
- Set up virtual data room (VDR) access protocols
- Agree on communication protocols between buyer and seller teams
⏱️ Timeline: 1-3 weeks for LOI negotiation
Phase 4: Confirmatory Due Diligence
04
Data Room · Third-Party Advisors
The Deep Dive — Full Data Room Access
This is the phase most people think of when they hear "due diligence." The buyer's advisors get full access to the data room and conduct independent verification of every material claim in the CIM. This is the most expensive and time-consuming phase.
- Quality of Earnings (QoE): Independent analysis adjusting EBITDA for one-time items, owner add-backs, and accounting policy changes. The single most important diligence deliverable.
- Legal Diligence: Material contract review, litigation analysis, IP portfolio audit, employment law compliance, regulatory exposure
- Tax Diligence: Federal/state/local tax filings, transfer pricing, NOLs, R&D credits, sales tax nexus
- Commercial Diligence: Customer reference calls, win/loss analysis, market sizing validation, competitive positioning
- IT Diligence: Technology stack assessment, cybersecurity posture, data architecture, integration complexity
- HR Diligence: Benefits review, compensation benchmarking, retention risk, union exposure, culture assessment
- Environmental: Phase I ESA, compliance records, remediation liabilities (if applicable)
⏱️ Timeline: 30-60 days · Cost: $50K-$250K+ in advisor fees
Phase 5: Negotiation & Definitive Agreement
05
Legal · Negotiation
Stock Purchase Agreement / Asset Purchase Agreement
Findings from confirmatory diligence feed directly into the definitive agreement negotiation. Price adjustments, reps & warranties, indemnification caps, and escrow amounts are all driven by what diligence uncovered.
- Negotiate purchase price adjustments based on QoE findings
- Draft reps & warranties based on diligence findings
- Structure indemnification (caps, baskets, survival periods)
- Determine escrow/holdback amounts for post-close protection
- Negotiate earnout provisions (if applicable)
- Finalize employment agreements for retained management
- Secure financing commitments (debt, equity contributions)
⏱️ Timeline: 2-4 weeks concurrent with late confirmatory diligence
Phase 6: Closing & Post-Close Integration
06
Closing · Integration
Sign, Fund, and Integrate
Conditions precedent satisfied, financing in place, definitive agreement signed — the deal closes. Then the real work begins: integration.
- Satisfy closing conditions (regulatory approvals, financing, third-party consents)
- Execute fund flow — wire purchase price, pay off existing debt
- File required regulatory notices (HSR, state, industry-specific)
- Day 1: announce the transaction, integrate systems and processes
- 100-day plan: execute integration milestones (IT, operations, culture)
- Post-close true-up: working capital adjustment, escrow release schedule
- Post-close earnout tracking (if applicable)
⏱️ Timeline: 1-2 weeks to close · 6-24 months for full integration
Who Does What: The Diligence Team
A typical M&A diligence team brings together internal deal professionals and external advisors. Here's who's at the table:
👔
Deal Lead / Partner
Final go/no-go decisions, price negotiation
📊
VP / Principal
Manages the diligence process end-to-end
💼
Associate / Analyst
Financial modeling, data room review, reports
⚖️
Legal Counsel
Contract review, reps & warranties, SPA drafting
💰
QoE Provider
Independent earnings quality analysis
🏛️
Tax Advisor
Structuring, NOLs, transfer pricing
💻
IT Consultant
Tech stack, cybersecurity, integration assessment
🤝
HR Advisor
Benefits, compensation, retention risk
Cost Breakdown by Phase
| Phase | Traditional Cost | Time | proprietary-algorithm |
|---|
| Target Screening | $0 (internal time) | 2-6 weeks | $49/target · <1 day |
| Preliminary Diligence | $5K-$25K/target | 1-4 weeks | $49/target · <1 hour |
| LOI Negotiation | $10K-$50K legal | 1-3 weeks | Same (legal work) |
| Confirmatory Diligence | $50K-$250K+ | 30-60 days | $40K-$180K (faster screening, same QoE) |
| SPA Negotiation | $20K-$80K legal | 2-4 weeks | Same (legal work) |
| Total (per deal) | $85K-$405K+ | 3-6 months | Screen at $49, QoE still needed |
The key insight: AI doesn't replace QoE or legal diligence — it replaces the expensive, time-consuming screening that happens before you commit to a single target. Screen 20 targets for $980 instead of screening 1 for $25,000.
Before AI: The Screening Bottleneck
Historically, deal teams could only deeply investigate 3-5 targets at a time because each preliminary report cost $5K-$25K and took weeks. This meant most targets never got a proper screen — they were eliminated based on a skim of the CIM and a gut feeling.
After AI: Screening at Scale
proprietary-algorithm diligence tools (like dodilligence) compress preliminary screening from weeks to minutes and from $25K to $49. A deal team can now screen 20-30 targets in an afternoon, finding the best opportunity rather than settling for the first acceptable one. The confirmatory phase (QoE, legal, tax) still requires human experts — but they're working on the right target.
What AI Does NOT Replace
- Quality of Earnings analysis (requires audit-level data room access)
- Legal contract review and SPA negotiation
- Customer reference calls and commercial validation
- Management meetings and cultural assessment
- Final investment committee decision-making
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Frequently Asked Questions
What are the phases of M&A due diligence?
M&A due diligence typically has 6 phases: (1) target screening, (2) preliminary diligence (pre-LOI), (3) LOI and exclusivity, (4) confirmatory diligence, (5) negotiation and SPA, and (6) closing. Each phase narrows risk and refines valuation — the process moves from "should we pursue this?" to "exactly what are we buying and at what price?"
How long does M&A due diligence take?
From LOI to close, M&A due diligence takes 60-120 days on average. Preliminary screening adds 2-4 weeks before that. Complex deals (cross-border, regulated industries, carve-outs) can take 6-9 months. proprietary-algorithm screening compresses the front end — the screening and preliminary phases — from weeks to hours, but confirmatory diligence still requires the full data room timeline.
What is the difference between preliminary and confirmatory due diligence?
Preliminary due diligence happens before an LOI using public data, CIMs, and management calls — its goal is deciding whether to pursue a target. Confirmatory due diligence happens after an LOI with full data room access, third-party advisors, and a Quality of Earnings analysis. Preliminary diligence is about filtering; confirmatory diligence is about verifying and pricing.
How much does M&A due diligence cost?
Traditional M&A due diligence costs $50,000-$250,000+ per deal in advisory fees alone. The breakdown: Quality of Earnings ($30K-$80K), legal ($25K-$100K), tax ($10K-$30K), commercial ($15K-$50K), IT ($10K-$30K). proprietary-algorithm screening reports cost $49 per company, making it affordable to screen 10-20 targets before committing to a single confirmatory engagement.
Who is involved in the due diligence process?
The deal team (PE associates, VP, partner or corporate development team) leads the process. External advisors include legal counsel, a QoE provider (typically Big 4 or mid-tier accounting firm), tax specialists, IT consultants, and sometimes environmental or industry-specific experts. The seller's management team and their advisors participate in management meetings and data room preparation.
What is a Quality of Earnings (QoE) report?
A Quality of Earnings report is an independent analysis that adjusts reported EBITDA to reflect normalized, sustainable earnings. It removes one-time items, owner add-backs (personal expenses run through the business), and accounting irregularities. The QoE determines the "true" earnings power of the business — which directly drives the purchase price. It is the most critical deliverable of confirmatory diligence.
What percentage of deals die during due diligence?
Approximately 50-70% of LOIs result in a closed transaction. Deals fall through for reasons including: QoE adjustments that lower EBITDA below the buyer's threshold, undisclosed litigation, customer concentration risk discovered in reference calls, technology debt that makes integration costly, and valuation gaps that emerge from diligence findings.
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