Selling a UK business well takes 12 months of preparation before you go to market. The work falls into four areas: financial cleanup, operational independence from the founder, customer and contract de-risking, and a clear growth narrative. Done well, the multiple lifts by 20-50%. Done poorly, the deal collapses or completes at a steep discount.

Most owner-managers start preparing 3-6 months before they''d like to sell. By then, half the value-uplifting actions are no longer available within the timeline.

Month 12-9 before sale — financials and structure

Clean the management accounts

Buyers and their accountants want 24 months of monthly management accounts that match the statutory accounts. Errors, restated months, and "I''ll re-do that bit before you see it" answers kill deals.

Get the management accounts onto a clean monthly cadence — typically by your accountant or fractional CFO — at least 12 months before you go to market. The cycle: month-end close within 10 working days, reviewed P&L plus balance sheet plus cash flow.

Anything done with or through a related entity (your spouse''s company, another company you own, family member loans) is a red flag in due diligence. Untangle or properly document them now.

Audit your tax position

VAT compliance, PAYE compliance, Corporation Tax compliance, R&D claims, capital allowances. Any issue HMRC could raise becomes a buyer''s lever for a price chip. Get a tax-health check from your accountant.

Re-classify owner remuneration

Owner-managed companies typically pay the owner in tax-efficient mixes (low salary + dividends, pension contributions, expenses). For sale, the buyer wants to see "normalised EBITDA" — what the business would earn if a market-rate employee were running it. Document this normalisation 12 months ahead.

Month 9-6 — operational independence

Build a management team

The single biggest valuation killer: the business stops without you. Map every key relationship, decision, and operational task you still personally hold. Hand them off to others on the team, formally, with documentation.

If you''re still the rainmaker, the key delivery person, or the operational bottleneck, the buyer either lowballs (high risk) or builds a long earn-out (low cash at close).

Document the operating system

SOPs for every recurring critical task.
A succession plan for every critical role.
A management dashboard showing the metrics that drive the business.
A 12-month forward plan owned by the team, not just by you.

The goal: a buyer should be able to read 30 pages and understand how the business runs without ever speaking to you.

Stop being the brand

If the business is named after you, the buyer wonders what happens when you leave. Soften the personal branding through this period if possible — increase the visibility of others on the team, the company name, the methodology.

Month 6-3 — customer and contract de-risking

Reduce customer concentration

If your top customer is 30%+ of revenue, the buyer prices in customer-loss risk. Diversify before going to market — bring in 3-5 mid-sized customers to spread the base.

If you can''t diversify (e.g. you''re a specialist with a few big customers), get long contracts in writing with those customers. A 3-year locked contract de-risks dramatically.

Lock in recurring revenue

Convert one-off project work to retainer where you can. Recurring revenue gets a multiple-of-revenue valuation; project work gets a multiple-of-EBITDA valuation. The first is usually higher.

Tighten supplier contracts

Buyers worry about supplier risk just as much as customer risk. A key supplier on month-to-month terms is a risk; the same supplier on a 3-year contract is an asset.

Clean up IP

Every piece of IP the business uses or sells should be properly assigned to the company. Trademarks registered. Copyrights documented. Software code in company repositories, not personal ones. Customer data legally owned by the company.

Month 3-0 — narrative and presentation

Build the deal narrative

The buyer doesn''t buy past performance; they buy future cash flows. The deal narrative is the story of how this business is worth more in 3-5 years than today — credibly.

A good narrative includes:

The specific market trend that makes the business well-positioned.
The growth levers the next owner can pull (geographic expansion, new product line, cross-sell to existing customers).
The operational improvements the next owner can make (automate X, hire Y).
Why the current owner can''t maximise this themselves (timing, capital, focus).

This narrative needs to be specific, evidenced, and credible. "We could double if we just had more sales" doesn''t cut it.

Prepare the data room

Standard contents:

3 years of statutory accounts.
2 years of monthly management accounts.
Tax returns and HMRC correspondence.
Customer contracts (top 20).
Supplier contracts.
Employment contracts.
Cap table and Shareholders Agreement.
IP register.
Insurance policies.
Material litigation history.
Premises lease.

Organise in a virtual data room (Datasite, Intralinks, or a simple controlled Dropbox). Buyers expect to see it on the second meeting.

Choose advisors

For a typical UK SME sale:

Corporate finance adviser — runs the sale process, finds buyers, leads negotiations. Typically 1-3% of deal value plus a small monthly retainer.
Solicitor specialising in M&A — typically £15-£50K for a deal under £5M.
Tax adviser — specifically for pre-sale tax structuring (BADR eligibility, etc.).

Engage them 6+ months before going to market. Their first work is often advising you on this preparation list, not on the sale itself.

What to do this month

If you''re planning to sell in the next 12-24 months:

Get monthly management accounts onto a clean cycle this quarter.
Audit owner-dependence in the business — map the tasks only you currently do.
Calculate your customer concentration. If top customer >25%, plan the diversification.
Talk to a corporate finance adviser (most do free initial conversations) to get a realistic value range and the specific levers that would lift it.

Preparing your business for sale: the 12-month checklist