Company Purchase Legal Checklist In The UK

Buying a company can be an exciting shortcut to growth. Instead of building from scratch, you’re buying a business with customers, contracts, staff, suppliers, and (hopefully) revenue already in place.

But it’s also one of the fastest ways for a small business to inherit expensive surprises - hidden liabilities, messy share structures, unclear IP ownership, or contracts that don’t do what you thought they did.

So, if you’re planning a company purchase in the UK, the goal is simple: get the commercial upside, without buying legal risk you didn’t price in.

Below is a practical, SME-friendly checklist to help you navigate the process with confidence - and to know when you should pause and get tailored advice.

Is A Company Purchase The Right Route For Your Business?

Before you get into documents and negotiations, take a step back and make sure a company purchase is actually the right deal structure for what you’re trying to achieve.

In the UK, acquisitions usually happen in one of two ways:

Share Purchase (Buying The Company Itself)

• What it means: You buy the shares in the target company (i.e. you become the owner of the entire company).
• Why it’s popular: You get the whole business “as is” - including existing contracts, staff, licences, brand reputation and trading history.
• The risk: You also inherit the company’s liabilities (known and unknown), because the company stays the same legal entity.

Asset Purchase (Buying Parts Of The Business)

• What it means: You buy selected assets (e.g. stock, equipment, IP, customer lists, goodwill) and leave unwanted liabilities behind (to the extent the deal is structured that way).
• Why it’s popular: It can be cleaner and lower-risk if the seller’s company has historic issues.
• The risk: You may need to transfer or re-paper arrangements with customers/suppliers, transfer IP, move employees (often via TUPE), and manage operational transitions - depending on how the assets and contracts are held and drafted.

If your goal is speed and continuity, a share-based company purchase is often attractive. If your goal is to “cherry-pick” value and avoid historic baggage, an asset purchase may be better.

Either way, the legal process should match your risk appetite, budget, and timeline - and it’s worth sanity-checking that early. (We also mention tax and financial issues below, but this article isn’t tax or financial advice - get specialist input for your specific deal.)

What Are You Actually Buying In A Company Purchase?

One of the most common problems we see in a company purchase is that the buyer thinks they’re buying “a business”, but legally they’re buying a set of rights and obligations - and some of those obligations can be painful.

As a starting point, break the target down into categories and confirm what exists, who owns it, and whether it transfers.

Key Areas To Map Out

• Shares and control: Who owns the shares? Are there different share classes? Any options, convertibles, or rights that dilute you later?
• Contracts: Customer agreements, supplier arrangements, leases, finance agreements, distribution deals - and whether they change on a transfer of ownership/control or need consent/notice.
• People: Employees, contractors, consultants, founders - and what they’re entitled to if they leave post-sale.
• Intellectual property (IP): Brand name, logo, domain, software, source code, designs, content, know-how. Crucially: does the company actually own the IP?
• Data and systems: Customer databases, marketing lists, CRM, analytics, SaaS subscriptions - and whether data use is UK GDPR compliant.
• Regulatory permissions: Any licences needed for the industry, and whether they’re transferable or must be reapplied for.
• Liabilities: Tax, employment claims, disputes, warranties to customers, refunds/chargebacks, and any threatened litigation.

Tip: when you’re running a company purchase project internally, keep a simple deal tracker (a spreadsheet is fine) and record who is checking what, what evidence you’ve seen, and what’s still outstanding. This makes it much easier to negotiate price reductions, retention, or contractual protection later.

Your Pre-Offer Legal Checklist (Before You Agree Heads Of Terms)

Once you’ve found a target you like, it’s tempting to rush straight into a price discussion. But before you lock yourself into heads of terms (or a letter of intent), you’ll want some early safeguards in place.

1) Get Confidentiality Locked In

Early-stage acquisition talks usually involve sensitive information - customer lists, margins, supplier pricing, and product roadmaps. Make sure confidentiality is agreed before disclosures begin, and be clear about:

• what counts as confidential information
• who in your team/advisers can see it
• how long confidentiality lasts
• what happens if the deal doesn’t proceed

2) Clarify The Deal Structure Early

Is this definitely a share purchase (a classic company purchase), or is it an asset purchase? Are you buying 100% of the shares, or is it staged (e.g. 70% now, 30% later)?

Small changes to structure can have major knock-on effects for:

• tax (get tax advice for your specific circumstances)
• transferability of contracts
• employee treatment (including TUPE)
• risk allocation in the sale contract

3) Put Exclusivity And Timelines On The Table

If you’re going to invest time and money into due diligence, consider negotiating exclusivity for a set period - so you’re not funding a process while the seller shops the deal elsewhere.

4) Agree “Subject To Contract” (And Mean It)

In the UK, deal terms can sometimes become binding earlier than you expect if you’re not careful with wording. Make sure documents and communications are clearly “subject to contract” until the final sale agreement is signed.

5) Choose The Right Core Deal Document

For most acquisitions, the central legal document is the sale agreement setting out price, warranties, indemnities, completion mechanics, and post-completion obligations. The right agreement depends on structure - but for many SME acquisitions, a properly drafted Business Sale Agreement (tailored to the deal) is the backbone of the transaction.

Pre-offer paperwork is also where you can set yourself up for a smoother closing process - for example, knowing what will be needed at completion and who is responsible for each deliverable.

Due Diligence: The Core Of A Safe Company Purchase

If there’s one step you shouldn’t skip in a company purchase, it’s due diligence. This is where you verify the seller’s claims, uncover hidden risk, and decide what protections you need in the contract (or whether to walk away).

For SMEs and startups, due diligence doesn’t need to be “big corporate” to be effective - it just needs to be focused and evidence-based.

Company And Corporate Due Diligence

• Confirm company details (Companies House filings, directors, PSCs, registered office).
• Review the cap table: who owns what, and are there any share options, convertible notes, or unusual rights?
• Check whether the company has complied with Companies Act requirements (board minutes, shareholder resolutions, filings).
• Identify any charges/security registered against the company (e.g. lender security).

Financial And Tax Due Diligence

• Review management accounts, forecasts, and cashflow (and understand seasonality).
• Check VAT, PAYE, and corporation tax status (including any payment plans or arrears).
• Understand revenue recognition and whether income is recurring or one-off.
• Look for red flags: unpaid liabilities, unusual related-party transactions, or aggressive accounting assumptions.

Commercial Contracts Due Diligence

• Identify top customers and suppliers by revenue/criticality.
• Check key terms: termination rights, auto-renewals, service levels, warranties, price changes.
• Look for change of control clauses (these can allow termination after a share sale).
• Confirm whether any consents or notices are needed pre- or post-completion.

Employment And Contractor Due Diligence

Staff risk is one of the easiest ways to overpay in a company purchase. You’ll want to review:

• employment contracts, handbooks, policies, and any bonus/commission arrangements
• holiday records, working time compliance, and any disputes or grievances
• settlement agreements, exit risks, or “key person” dependency
• contractors who might actually be workers/employees (misclassification can create liabilities)

If you’ll be issuing new terms post-acquisition, it’s worth lining up robust templates early, like an Employment Contract, rather than trying to patch things together after completion.

IP And Tech Due Diligence (Especially For Startups)

For tech-led businesses, IP can be the entire value of the deal - so you’ll want to confirm ownership and avoid nasty surprises. Key checks include:

• Whether founders/contractors assigned IP properly (if not, the company may not own its own code or brand assets).
• Open-source use and licence compliance (relevant for software companies).
• Registered trade marks/designs and domain ownership.
• Any disputes, takedowns, or infringement claims.

Data Protection And Privacy Due Diligence

If the target holds personal data (customers, subscribers, employees), you’ll need to check whether they’re handling it lawfully under UK GDPR and the Data Protection Act 2018.

In many acquisitions, you’ll also need to tighten how data is processed between group companies, suppliers, and platforms - and a tailored Data Processing Agreement can be a key piece of the compliance puzzle.

How Due Diligence Impacts The Contract

What you find in due diligence should feed directly into the sale documentation - this is where you:

• negotiate warranties (promises about the state of the business)
• ask for indemnities (specific protection for known risks)
• agree a retention or escrow (so money is held back if issues arise)
• adjust the price or walk away

If you want a structured, end-to-end approach to checking the target business, a Legal Due Diligence Package can help keep the process efficient and focused on the risks that actually matter.

Completion And Post-Completion Steps (So The Deal Sticks)

Signing the sale agreement is a major milestone - but in a company purchase, a lot of the risk sits in the “completion mechanics” and the months after completion.

This is where SMEs can get caught out: the deal is “done”, but practical items like consents, resignations, bank mandates, IP transfers, and customer communications haven’t been properly actioned.

Completion Checklist: What To Prepare

Most deals have a completion checklist (sometimes called “conditions” or “deliverables”) to ensure everything that needs to happen at signing/completion actually happens.

This typically includes:

• board and shareholder resolutions approving the transaction
• share transfers and share certificates
• director resignations/appointments and Companies House filings
• release of existing security/charges (if relevant)
• bank mandate changes
• handover of statutory books and key company records
• assignment or transfer of key assets if required

Practically, it helps to work from a clear Completion Checklist so you can track what’s outstanding and avoid a last-minute scramble.

Novation, Assignment, And Contract Transfers

In a share-based company purchase, contracts often stay with the target company - but you still need to check what each contract says and what the other party can do if ownership/control changes.

Common issues include:

• change of control triggers requiring notice or consent
• group restructures post-acquisition where you want contracts moved to a new entity
• supplier/customer requirements for novation rather than assignment

If a contract needs to move from one entity to another, you may need a Deed of Novation so all parties agree to the transfer (not just you and the seller).

Funding And Security (If You’re Using Finance)

If your company purchase is funded through a loan or investor capital, make sure you’re clear on:

• what security the lender requires (charges, debentures, personal guarantees)
• what covenants/restrictions apply after the deal
• how repayment works and what triggers default

This is also where the “real” commercial negotiation can sit - because your funding terms can affect your ability to operate and grow post-completion. (Again, get specialist financial/tax advice for your specific funding structure.)

Post-Completion Integration (The Part Nobody Budgeted For)

After completion, you’ll want a plan for:

• customer and supplier communications (especially where consent is required)
• brand transition and public-facing messaging
• systems and data migration (including privacy compliance)
• employment changes (carefully handled to avoid contractual and unfair dismissal risks)
• IP housekeeping (confirm registrations, domain access, and any lingering founder accounts)

Many SMEs also forget to tidy up the shareholder position post-acquisition - for example, if there are multiple selling shareholders, rollover equity, or ongoing minority stakes. If the deal involves shares changing hands (or future transfers), a properly drafted Share Sale Agreement (aligned with the wider transaction terms) can be critical.

Key Takeaways

• A company purchase is often done as a share purchase (buying the company), but an asset purchase may be safer if you want to avoid historic liabilities (depending on what transfers and how it’s structured).
• Before you agree key terms, lock in confidentiality, clarify “subject to contract”, and confirm the intended structure and timeline.
• Due diligence is where you uncover hidden risk - and it should directly inform warranties, indemnities, retention/escrow, and price adjustments.
• Pay extra attention to employment, IP ownership, key commercial contracts, and data protection compliance, as these are common deal-breakers for SMEs and startups.
• Completion is more than signing - a detailed completion checklist, proper consents, and clean post-completion integration are what make the deal stick.
• If you’re unsure what’s market-standard or what protections you need, getting tailored legal advice early can save significant time and cost later.

If you’d like help with a company purchase - from due diligence and negotiations through to drafting and completion - you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no-obligations chat.