The 18-Month Exit Preparation Checklist for UK Business Owners

Eighteen months is about the minimum time you need to prepare a business properly for sale. Most owners who rush to market in three to six months leave money on the table, face due diligence surprises, or watch deals collapse entirely. The checklist below is organised into three phases. Strategic, operational, and process. With specific tasks rather than vague principles. Work through it in order and you will arrive at market in a materially stronger position than if you had simply called a broker and asked for an information memorandum.

Table of Contents

Why does timing matter so much in exit preparation?

Buyers pay for future earnings, not past performance. What they are really buying is confidence. Confidence that the business will continue to perform after you leave, that the numbers are clean, that there are no legal surprises, and that the management team can operate without you. None of those things can be manufactured in six weeks. They take time to build and, crucially, they need to show up in two to three years of management accounts before a sophisticated buyer will give them full credit.

A business that has done the preparation work typically achieves a valuation premium of 0.5x to 1.5x EBITDA over a comparable business that has not. On a business turning £1m EBITDA, that is £500k to £1.5m of additional proceeds. For work you could do yourself.

Phase 1 (18–12 months): Strategic and structural work

This phase is about fixing the things that would genuinely concern a buyer during due diligence, and that take the longest to demonstrate credibly.

Reduce owner dependency

This is the single most value-destructive issue in owner-managed businesses. If you are the primary relationship with your top five clients, the holder of key supplier agreements, or the only person who understands how the operation actually works, a buyer will price that risk heavily. Or walk away.

Tasks:

  1. Map every critical business relationship to a named individual. Where that individual is you, create a transition plan and begin executing it.
  2. Introduce senior managers formally to key clients. In person where possible.
  3. Ensure your top five customers have documented contact with at least two people in your business other than yourself.
  4. Step back from day-to-day operations in at least one area of the business and document that the team has handled it successfully.

Build and evidence the management team

Buyers want to see a team that can run the business post-completion. If your management team is thin, now is the time to strengthen it. Through hiring, promotion, or both.

Tasks:

  1. Assess honestly whether your current managers could operate independently if you left tomorrow. If not, identify the gaps.
  2. Consider bringing in a capable FD or Finance Manager if you do not already have one. Buyers pay close attention to the quality of financial management.
  3. Put formal employment contracts and non-compete clauses in place for all senior staff. Checked by a qualified employment solicitor.
  4. Introduce or formalise a management incentive scheme (EMI options are the most common structure for SMEs).

Clean the financials

Three years of clear, consistent management accounts are the baseline expectation from any serious buyer. Messy financials. Personal expenses run through the business, inconsistent accounting treatment, missing aged debtor reports. Will slow due diligence and reduce confidence.

Tasks:

  1. Identify and document all owner-specific adjustments (EBITDA addbacks) your salary above market rate, personal vehicles, any non-recurring costs. Have these prepared and defensible.
  2. If you are not already using a recognised accounting standard consistently, switch now and restate where necessary.
  3. Ensure your statutory accounts at Companies House are up to date.
  4. Review any related-party transactions (loans to/from directors, property held personally and rented to the business) and consider whether to clean these up before sale.

Phase 2 (12–6 months): Operational and commercial tightening

With the structural work underway, this phase focuses on the commercial and legal foundations that buyers scrutinise during due diligence.

Secure customer contracts

Revenue concentration and contract quality are two of the most common reasons buyers reduce their offer. Ideally, no single customer should represent more than 20–25% of revenue. Where that is unavoidable, you need long-term contracts in place.

Tasks:

  1. Audit all customer agreements. Identify which are on rolling purchase orders with no formal contract, and move to multi-year written agreements where possible.
  2. Check for change of control clauses. Many commercial contracts require customer consent on a business sale. Know where these exist before a buyer finds them.
  3. Renew any contracts due to expire within 12 months of your expected completion date.
  4. Document revenue by customer, and have a clear narrative ready for any concentration above 15%.

Protect IP and critical assets

Intellectual property. Whether that is a proprietary process, software, brand, or trade secret. Needs to be properly registered and assigned to the company, not held personally or through informal arrangements.

Tasks:

  1. Ensure all trademarks, patents, and domain names are registered in the company's name, not yours personally.
  2. Check that all software developed internally has proper assignment agreements in place. This is frequently overlooked.
  3. Review your data protection compliance (UK GDPR). Gaps here are increasingly a deal risk.

Retain key employees

Staff churn during a sale process is common and damaging. Buyers will want key employees to sign new contracts post-completion, and any departures during the process will raise concerns.

Tasks:

  1. Identify the five to ten people the business genuinely cannot afford to lose.
  2. Consider retention bonuses tied to completion, structured through your solicitor.
  3. Ensure all employment contracts are up to date, with appropriate confidentiality and IP assignment clauses.
  4. Brief your management team at the appropriate time. Not too early, but not after they hear rumours from other sources.

Phase 3 (6–0 months): Process, documentation, and advisers

This phase is about getting transaction-ready. The structural and commercial work is done; now you are preparing the materials and the team to run a sale process.

Select your advisers

A corporate finance adviser (typically a boutique or regional firm at this level) will run the process, approach buyers, and manage negotiations. You will also need a transaction solicitor and a tax adviser who understands exit planning.

Tasks:

  1. Get introductions to two or three corporate finance boutiques with relevant sector experience. Meet them, compare their approach and their fee structure (retainer plus success fee is standard).
  2. Instruct a solicitor experienced in Share Purchase Agreements and due diligence processes.
  3. Review your personal tax position with a qualified UK tax adviser, including eligibility for Business Asset Disposal Relief (BADR), which currently provides a 14% CGT rate on the first £1m of qualifying gains (rising to 18% from April 2026 for gains thereafter within the basic rate band).
  4. Consider whether an MBO, trade sale, or EOT structure best suits your objectives. Each has different tax and commercial implications.

Prepare the Information Memorandum

The IM is the primary document buyers use to assess your business. It needs to be accurate, well-presented, and tell a coherent story about performance, opportunity, and management capability.

Tasks:

  1. Work with your corporate finance adviser to draft the IM. This is not something to delegate entirely. You know the business, and the document needs to reflect that.
  2. Prepare a financial model showing historical performance, current year trading, and a credible forward projection with supporting assumptions.
  3. Prepare a clean management accounts pack. Typically three years plus the most recent period. Ready to share under NDA.

Prepare for Vendor Due Diligence (VDD)

Buyers and their advisers will ask for significant amounts of documentation. Being unprepared adds weeks to the process and signals poor management.

Tasks:

  1. Assemble a VDD data room covering: corporate documents (articles, shareholder agreements, Companies House filings), financial records, material contracts, employment contracts, property leases, IP registrations, and any regulatory or compliance documentation relevant to your sector.
  2. Work through likely due diligence questions with your advisers in advance. Anticipating surprises is far preferable to dealing with them mid-process.
  3. Ensure you have business interruption and key man insurance in place. Buyers often check.

How do these phases affect your valuation?

The table below shows the typical EBITDA multiple impact of common preparation activities across relevant UK sectors.

SectorTypical Multiple (Unprepared)Typical Multiple (Well-Prepared)Key Value Driver
Manufacturing4.0–5.5x5.5–7.0xRecurring customer contracts, management depth
Professional Services4.0–5.5x5.5–7.5xReduced owner dependency, contract tenure
Logistics / Distribution3.5–5.0x5.0–6.5xCustomer concentration, fleet asset clarity
Healthcare Services5.0–7.0x7.0–9.0xCQC compliance, staff retention, contract security
Recruitment3.5–5.0x5.0–6.5xPerm vs contract mix, key biller retention
Facilities Management4.0–5.5x5.5–7.0xContract length, margin quality

Multiples are indicative for UK owner-managed businesses with EBITDA of £500k–£5m as at 2025/26. Individual circumstances will vary.

FAQ

How long does a UK business sale typically take from going to market to completion? Six to twelve months is the realistic range for a well-prepared UK mid-market business. If preparation is incomplete, add three to six months for the diligence delays that will inevitably arise.

Do I need to tell my staff before going to market? No. And you generally should not. Most sale processes involve a tight confidentiality protocol. Senior managers are typically briefed once a preferred buyer is identified and Heads of Terms are agreed.

What is BADR and will I qualify? Business Asset Disposal Relief (formerly Entrepreneurs' Relief) reduces CGT to 14% on qualifying gains up to £1m. Eligibility requires that you have owned at least 5% of the ordinary shares and voting rights, been an employee or director, for at least two years. The rate increases to 18% from April 2026. This article contains general information only and does not constitute financial or tax advice. Every business sale is different. Speak to a qualified UK tax adviser about your specific situation before making any decisions.

Should I get a formal valuation before starting the preparation process? Yes. It gives you a baseline, helps you identify where the gaps are, and means you can set realistic expectations before spending 18 months preparing.

What if I do not have three years of clean accounts? Buyers will work with what they have, but expect more scrutiny, longer diligence, and likely a lower multiple or a deferred element to the consideration (an earn-out). Getting accounts in order is non-negotiable for a clean deal.

What is an earn-out and should I be concerned about it? An earn-out is where part of the purchase price is contingent on future performance. They are common where a buyer has concerns about post-completion performance or owner dependency. A well-prepared business with evidenced management depth is much better placed to negotiate a lower earn-out element or avoid one entirely.

Get a valuation estimate

Before you begin this process, it helps to know where you are starting from. Use the free business valuation calculator on Succession Group's website to get an indicative valuation range based on your sector, revenue, and EBITDA. It takes three minutes and gives you a useful benchmark to work from as you move through the checklist above.