M&A Process Explained: Complete Timeline

Month-by-Month Guide to Selling Your UK Business from Start to Finish

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Published: 2026 | Category: M&A Process | Read Time: 11 minutes

Selling a business is a complex, multi-stage process that typically takes 12-18 months from start to finish. Understanding what happens at each stage, who's involved, and what to expect helps business owners prepare properly and avoid costly surprises.

Most business owners have never sold a company before. They don't know the typical timeline, what activities happen when, or how long things really take. This uncertainty creates anxiety and poor decision-making.

In this guide, we break down the entire M&A process month-by-month, showing exactly what happens, when it happens, and what your role is at each stage.

12-18 months

Typical Sale Timeline

6-8 people

Usually Involved in Deal

100+ hours

Time Commitment Required

The 4 Phases of Business Sale

The M&A process breaks into 4 distinct phases, each with different activities and timelines:

Phase 1: PREPARATION (Months 1-6)

Goal: Get ready to sell. Prepare financials, build team, clean up operations.

Time Commitment: 5-10 hours/month

Phase 2: MARKETING (Months 7-12)

Goal: Find buyers and create competitive tension. Present business to potential acquirers.

Time Commitment: 10-20 hours/month

Phase 3: DUE DILIGENCE (Months 10-15)

Goal: Buyer investigates your business thoroughly. Respond to questions and data requests.

Time Commitment: 20-40 hours/month

Phase 4: NEGOTIATION & CLOSING (Months 13-18)

Goal: Finalize terms, legal documents, and close the deal.

Time Commitment: 15-30 hours/month

Month-by-Month M&A Timeline

MONTHS 1-3: PREPARATION & ADVISOR SELECTION

Month 1: Initial Preparation

Your Activities:

• Decide to sell or explore options

• Research M&A advisors, brokers, business valuers

• Schedule initial meetings with 3-5 advisors

• Begin organizing financial records

• Assess current business health and valuation

  
  

Key Decision: Who will represent you? (advisor, broker, or DIY) Time: 5-10 hours

Month 2: Advisor Engagement & Financial Review

Your Activities:

• Hire M&A advisor/broker (usually 5-8% of deal value)

• Engage corporate lawyer and accountant

• Provide 3-5 years of financial statements

• Review and clean up accounting records

• Create initial business overview document

  
  

Advisor Activities:

• Deep dive into financials and business model

• Identify valuation range and likely multiples

• Begin compiling Confidential Information Memorandum (CIM)

• Advise on preparation needed before marketing

Time: 8-15 hours

Month 3: CIM Development & Buyer List Creation

Your Activities:

• Provide detailed company information

• Review CIM draft for accuracy

• Prepare customer list and contracts

• Organize employee documentation

• Finalize business financials and projections

  
  

Advisor Activities:

• Complete Confidential Information Memorandum (15-20 pages)

• Identify 50-100 potential buyers

• Create buyer list by type (strategic, PE, MBO)

• Prepare initial pitch materials

Output: Complete CIM ready for distribution Time: 10-15 hours

MONTHS 4-6: MARKET LAUNCH & BUYER CONVERSATIONS

Month 4: Confidentiality Agreements & Initial Outreach

Advisor Activities:

• Send NDA (Non-Disclosure Agreement) to potential buyers

• Conduct initial buyer calls (teaser pitch)

• Gauge buyer interest in business category

• Distribute CIM to interested parties (under NDA)

  
  

Your Role: Minimal. Advisor manages outreach. Expected Outcome: 10-20 buyers receive CIM, 5-10 serious inquiries Time: 2-5 hours

Month 5: Initial Buyer Meetings & Qualification

Advisor Activities:

• Schedule calls with interested buyers

• Answer initial questions about business

• Qualify buyers (seriousness, financing, synergies)

• Ask for indication of interest and valuation estimate

  
  

Your Role:

• May join some buyer calls if needed

• Answer detailed questions about business

• Assess buyer quality and fit

  
  

Expected Outcome: 3-6 serious buyers identified Time: 5-10 hours

Month 6: Management Presentations & First Round Meetings

Your Activities:

• Prepare management presentation (PowerPoint)

• Meet with top 3-4 buyer finalists

• Present business overview and growth plans

• Assess buyer's strategic vision and fit

• Negotiate exclusivity with lead buyer (optional)

  
  

Expected Outcome: 2-4 buyers move to next stage, 1 potential "lead buyer" Time: 10-15 hours

MONTHS 7-9: DUE DILIGENCE COMMENCEMENT

Month 7: Data Room Setup & Diligence Begins

Advisor & Your Activities:

• Create virtual data room with all company documents

• Organize by category: Financials, Legal, Operations, Customers, IP

• Provide controlled access to qualified buyers

• Buyers begin document review

• Answer initial information requests

  
  

Your Role: Respond to information requests, provide documents Time: 10-20 hours

Month 8: Detailed Buyer Questions & Diligence Calls

Buyer Activities:

• Review financial statements in detail

• Conduct customer reference calls

• Review contracts and legal documents

• Assess technology infrastructure

• Evaluate management team strength

  
  

Your Activities:

• Prepare responses to detailed questions (RFI - Request for Information)

• Participate in management calls with buyers

• Arrange customer reference calls if requested

• Respond to financial question deep dives

Time: 20-30 hours

Month 9: Commercial & Legal Diligence Completion

What Happens:

• Third-party commercial assessment (market position, growth, risks)

• Final financial deep dive

• Legal review of all contracts

• Buyer creates detailed data sheet of findings

• Buyer prepares initial offer/term sheet

Your Time: 15-25 hours

MONTHS 10-12: OFFERS & NEGOTIATION

Month 10: Term Sheet Submission & Negotiation

What Happens:

• Buyer submits term sheet (proposed deal terms)

• Typically includes: Purchase price, structure, earnout, reps & warranties

• Your advisor reviews and advises

• Negotiate key terms: price, cash/earnout split, post-close obligations

  
  

Key Negotiations:

• Price and valuation multiple

• Cash at close vs. earnout payments

• Representations and warranties scope

• Indemnification period and caps

• Founder role post-close (if any)

Time: 15-25 hours

Month 11: Term Sheet Acceptance & Legal Preparation

What Happens:

• Negotiate and finalize term sheet

• Both parties sign term sheet (non-binding except confidentiality)

• Lawyers begin drafting purchase agreement

• Final financial statements prepared for sale

• Tax planning and structure finalization

Your Activities:

• Review and approve term sheet terms

• Work with lawyer on purchase agreement

• Provide clarifications on business details

Time: 20-30 hours

Month 12: Purchase Agreement Negotiation & Final Preparation

What Happens:

• Lawyers negotiate detailed purchase agreement

• Reps and warranties drafted and discussed

• Indemnification and survival periods negotiated

• Closing conditions established

• Final purchase price adjustments discussed (working capital, etc.)

Your Role: Review and approve language with your lawyer Time: 20-30 hours

MONTHS 13-18: CLOSING & POST-CLOSE

Months 13-15: Final Legal Negotiations & Closing Prep

What Happens:

• Final round of purchase agreement edits

• Both parties' lawyers converge on final terms

• Closing date scheduled

• Final purchase price calculation (post-closing working capital adjustments)

• Prepare closing documents and exhibits

Time: 15-25 hours

Months 16-18: CLOSING & POST-CLOSE TRANSITION

Closing Day (Usually Day 1):

• Sign all final documents

• Buyer transfers purchase price to your account

• You transfer company ownership to buyer

• Keys, systems, passwords transferred

• Celebrate! 🎉

Post-Close (Months 16-18):

• 90-day transition period (if agreed)

• Train new owner on systems and relationships

• Introduce customers to new ownership

• Final knowledge transfer

• Earnout monitoring (if applicable)

Time: 10-20 hours

Key People Involved in M&A Process

1. M&A Advisor/Business Broker

Role:Manages entire process. Finds buyers, negotiates, coordinates advisors.

Cost:5-8% of deal value

Time Commitment from You:5-10 hours/month

2. Corporate M&A Lawyer

Role:Drafts and negotiates purchase agreement, advises on legal risks.

Cost:£5,000-20,000

Time Commitment from You:10-15 hours total

3. Business Accountant

Role:Prepares financial statements, audits, buyer questions.

Cost:£3,000-10,000

Time Commitment from You:5-10 hours

4. Tax Specialist

Role:Plans tax-efficient deal structure, minimizes capital gains tax.

Cost:£5,000-15,000

Time Commitment from You:3-5 hours

5. Business Valuation Expert

Role:Provides independent valuation, supports negotiation.

Cost:£2,500-5,000

Time Commitment from You:2-3 hours

💡 Total Cost of Advisors: Usually 8-15% of total deal proceeds (but earn back 15-25% higher sale price through better negotiations)

FAQ: Common M&A Timeline Questions

How Long Does It Really Take?

Typical timeline is 12-18 months. Aggressive sales (3 months) are possible but risky. Leisurely sales (2+ years) may lose momentum.

What If Buyer Wants to Move Faster?

Compressed timelines are possible (6-9 months) but involve more risk and potentially lower valuations due to rushed preparation.

Can I Sell and Stay in the Business?

Yes. Transition services agreements allow you to stay 3-12 months post-close if agreed. You're compensated separately.

What Happens During Earnouts?

If deal includes earnout (additional payments based on post-close performance), you typically receive initial 50-70% at close, rest over 1-3 years.

What If Due Diligence Finds Problems?

Price usually adjusts downward or buyer requires indemnification insurance to cover the risk.

Critical Timeline Milestones

Month	Key Milestone	What You Need
1-3	Advisors engaged, CIM complete	Clean financial records, business documentation
4-6	Buyers identified and meetings scheduled	Management presentation ready
7-9	Due diligence underway, 2-3 serious buyers	Data room organized, quick responses ready
10-12	Offers received, term sheet negotiated	Deal structure preferences clear
13-15	Purchase agreement finalized	All documents prepared
16-18	Closing and post-close transition	Transition plan ready

What Can Speed Up the Process?

• Having clean, well-organized financial records (saves 1-2 months)

• Clear, documented business processes (reduces diligence time)

• Strong management team (reduces founder dependency concerns)

• Diversified customer base (fewer customer concentration issues)

• Multiple buyers competing (creates urgency, speeds decisions)

• Being responsive to buyer questions (no delays in Q&A)

  
  

What Causes Delays?

• Disorganized financial records (can add 2-3 months)

• Unrealistic valuation expectations (kills early momentum)

• Poor communication or slow response times (frustrates buyers)

• Confidentiality breaches (scares buyers away)

• Key customer concentration issues (extends negotiation)

• Legal or compliance issues discovered in due diligence

• Financing issues on buyer's side (delays closing)

  
  

Key Insight: The first 6 months (preparation + marketing) set the tone. A well-prepared business with clear financials and management can close 2-3 months faster than one that isn't ready.

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