Buying an Existing Business in the UK: Legal Essentials

Buying an existing business can be a faster route to growth than building from scratch. You get customers, systems and revenue from day one - but you also inherit risks.

With the right structure, due diligence and contracts, you can protect yourself and set up your new venture for success. This guide walks you through the key legal steps when buying an existing business in the UK, from choosing between an asset or share purchase to managing employees, leases, intellectual property and completion logistics.

Why Buy An Existing Business (And What Can Go Wrong)?

There are clear advantages to acquiring an existing operation:

• Immediate cashflow: you step into existing revenue and contracts.
• Brand and IP: you can leverage established goodwill and processes.
• Experienced team: you may retain trained staff who know the business.
• Faster market entry: no long build phase before launch.

However, you need a clear-eyed view of the risks you could inherit if you don’t plan properly:

• Hidden liabilities: tax arrears, disputes or regulatory breaches can surface post-completion.
• Key dependency risks: revenue relying on a single customer or supplier can be fragile.
• Contracts and assets that don’t transfer: leases and licences often need consent.
• Brand/IP gaps: the seller may not actually own critical intellectual property.

This is why the legal structure you choose, your due diligence and the sale agreement terms matter so much. A robust process will help you buy the business you think you’re buying - and nothing you didn’t bargain for.

Share Purchase Vs Asset Purchase: Which Structure Works For You?

Most UK small business acquisitions are structured in one of two ways. Each approach has practical and tax consequences, and what fits best will depend on the specific business you’re buying.

Share Purchase (Buying The Company)

In a share deal, you acquire the shares of the limited company that operates the business. The company remains the legal owner of all its assets and liabilities - you simply step into the shoes of the previous shareholders.

Pros:

• Continuity: contracts, permits, bank accounts and licences usually remain in place because the company doesn’t change.
• Staff and operations: employees remain employed by the same company, limiting disruption.

Cons:

• Inheriting liabilities: you take on the company “as is”, including unknown liabilities. You’ll need strong warranties and indemnities.
• Complexity: detailed due diligence and disclosure processes are critical.

The main sale document is a Share Purchase Agreement (often called an SPA). For smaller deals, a concise Share Sale Agreement can be tailored to your transaction.

Asset Purchase (Buying The Business Assets)

In an asset deal, you purchase selected assets (and sometimes some liabilities) from the seller - for example, stock, equipment, IP, the trading name, and sometimes the lease and contracts.

Pros:

• Cleaner risk profile: you can cherry-pick assets and exclude unwanted liabilities.
• Tax/structural flexibility: can suit buyers acquiring into a new or different entity.

Cons:

• Consents needed: contracts, leases and licences don’t automatically move over - they may require third party consent to assign or novate.
• More moving parts: more separate transfers to organise at completion.

The main sale document is a Business/Asset Purchase Agreement - often called a Business Sale Agreement.

Tip: For some businesses (especially regulated, franchise or location-dependent operations), the practicalities of obtaining landlord, franchisor or regulator consent can make one route clearly preferable. Get tailored advice before you lock in heads of terms.

Step-By-Step: How To Buy An Existing Business In The UK

1) Shape The Deal: Heads Of Terms And Confidentiality

• Agree the key commercial points in a non-binding term sheet: structure (share vs asset), price and adjustment mechanism, what’s included, target completion date, and any conditions (like landlord consent or financing).
• Put NDAs in place before you receive detailed financials and customer information, especially if you’re a competitor.

2) Run Proper Legal And Financial Due Diligence

Due diligence is your chance to verify what you’re buying and uncover risks that can be priced, fixed or excluded. A structured Legal Due Diligence Package will cover corporate, contracts, employment, IP, property, regulatory, data protection and disputes. Your accountant should review financials, tax and working capital.

3) Choose The Right Contract Suite

• Share deals: Share Purchase Agreement, disclosure letter, tax covenant, board/shareholder approvals and stock transfer forms.
• Asset deals: Business/Asset Purchase Agreement, assignment/novation of key contracts, IP assignment, stock and equipment transfer, and if relevant, an agreement to transfer the premises lease (with landlord consent).

On either route, plan your completion steps early. A practical Completion Checklist helps you track signatures, consents, filings and funds flow.

4) Secure Third Party Consents And Approvals

Don’t leave consents to the last minute. Common approvals include:

• Landlord’s consent to assign or underlet a commercial lease - more on this below.
• Regulatory licences/registrations where the business is regulated (for example, alcohol, food, health services).
• Key customer or supplier consents where contracts prohibit assignment or change of control.
• Bank consent if there is security over assets being transferred.

5) Completion Mechanics And Post-Completion Tasks

• Funds flow: agree how the price moves between accounts, what gets paid off (for example, debt repayments) and how adjustments are calculated.
• Company secretarial: update the register of members, issue share certificates and member registers on share deals, and make any Companies House filings.
• Notifications: tell employees and customers, update bank mandates, insurance and suppliers, and put new policies in place.

What To Check In Due Diligence (And Why It Matters)

Here’s a practical checklist of areas most small business buyers should explore. Use the findings to renegotiate price, require fixes before completion, or expand warranties and indemnities.

Corporate And Ownership

• Company filings: confirm identity of shareholders and directors, and check for any restrictions or charges at Companies House.
• Share history: look for undocumented share issues or options that could complicate ownership. If you are acquiring via private transfers, the buyer and seller will usually need a Share Transfer and to consider stamp taxes.

Financial, Tax And Working Capital

• Financials: analyse profit drivers, seasonality, margins and cash conversion. Check for aggressive accounting policies.
• Taxes: confirm VAT registrations, PAYE, corporation tax status, and any HMRC correspondence or arrears. Understand whether VAT or transfer taxes will apply to your deal (for example, TOGC rules for asset sales meeting “going concern” conditions).

Contracts And Key Dependencies

• Revenue concentration: how resilient is turnover if one customer churns?
• Change-of-control clauses: many contracts allow termination or consent rights on a share sale - plan mitigation or consent strategy.
• Non-assignable contracts: for asset deals, confirm you can novate or re-paper critical relationships within your timeline.

Employment And People

• Headcount and terms: review Employment Contracts, handbooks and any collective arrangements.
• Compliance: holiday accruals, minimum wage adherence, working time and any existing disputes or grievances.
• TUPE: for asset deals, the Transfer of Undertakings (Protection of Employment) Regulations 2006 generally transfer employees (and their rights) to you automatically. Make sure you understand consultation and information duties, and continuity of terms. For context from a seller’s side, see employee rights on a business sale.

Intellectual Property And Brand

• Trade marks, domains and content: confirm who owns them and whether they’re properly registered. If you’re acquiring a brand, build in a plan to transfer a trade mark at or immediately after completion.
• Third-party IP: check licences for fonts, images, code, or software - particularly in digital businesses.

Data Protection And Privacy

• Customer data: verify GDPR compliance, privacy notices and consent mechanisms. If customer lists are part of the deal, ensure the transfer complies with UK GDPR and the Data Protection Act 2018.
• Data sharing: for some transactions, you may need a Data Sharing Agreement to handle pre-completion diligence or post-completion transition data flows.

Property And Leases

• Leases: review rent, service charges, repairing obligations, break rights and rent review patterns.
• Consents: landlords typically must consent to assignments or underletting. Your timeline should account for this process and its conditions - our guide to assigning a lease outlines the usual steps.

Regulatory And Sector-Specific Issues

• Licences and permits: alcohol, late hours, food hygiene, health services, transport and other regulated activities may require approvals to operate.
• Consumer compliance: if you sell to consumers, ensure policies and processes align with the Consumer Rights Act 2015 (for example, refunds, faulty goods and cancellations).

The Core Contracts And Protections You’ll Need

The sale agreement and its supporting documents allocate risk and set out exactly what is being bought. A well-negotiated set will help you manage unknowns and protect your investment.

The Main Sale Agreement

• Share deals: an SPA (or a tailored Share Sale Agreement) covers price, completion steps, warranties, limitations of liability and tax matters.
• Asset deals: a Business Sale Agreement specifies the assets and liabilities transferred, apportionment of employees and stock, and how contracts and leases are handled.

Warranties, Indemnities And Disclosures

• Warranties: seller promises about the state of the business (for example, no undisclosed disputes, compliance with law, ownership of assets).
• Disclosure letter: qualifies the warranties by revealing exceptions - read this closely and make sure the price and risk allocation reflect what’s disclosed.
• Indemnities: targeted protection for known risks (for example, a specific tax exposure or ongoing dispute).
• Limitations: caps, time limits and thresholds balance protection with commerciality.

Assignments, Novations And IP Transfers

• Contracts: assignment or novation agreements move key trading contracts across in an asset sale. Build a plan if consents take time.
• Premises: an agreement for lease assignment (with landlord’s consent and any required deposits or guarantees).
• IP transfers: trade mark and domain name assignments, software and content assignments, and confirm access to all accounts and code repositories.

Board And Shareholder Approvals

• Board minutes and resolutions for both parties approving the transaction.
• On share deals, stock transfer forms, updated statutory registers and share certificates. If you’re acquiring from multiple sellers or reorganising holdings, formal Share Transfer documentation is required.

Employees, Premises, IP And Data: What Transfers And What Doesn’t?

One of the biggest mistakes buyers make is assuming everything automatically moves over on completion. The reality depends on your structure.

Employees (TUPE)

On most asset purchases, the TUPE Regulations transfer employees to the buyer on their existing terms automatically. You will need to inform and, where required, consult with affected employees or their representatives before completion, and honour existing terms, continuity of service and accrued rights.

On share purchases, employees remain employed by the same company - there is no transfer - but a change of control may still trigger retention concerns, bonus provisions or change-of-control clauses in senior Employment Contracts. Have a plan for communications, onboarding to your policies and, if needed, revising terms lawfully after completion.

Premises And Leases

On a share deal, leases remain held by the company. Check for change-of-control provisions or landlord notification requirements.

On an asset deal, you’ll usually need landlord consent, and the landlord may require references, rent deposits, guarantors or variations. Budget the time and costs of the lease assignment process into your completion timeline.

Intellectual Property And Brand Assets

Domain names, trade marks, social handles, website content, images, code and product designs should be specifically listed and transferred. Where trade marks are registered, file the appropriate assignments promptly - our team handles the paperwork to transfer a trade mark post-completion.

Customer Data And Marketing Lists

Customer databases are valuable - and tightly regulated. UK GDPR allows data transfers in business sales, but you must ensure a lawful basis, update privacy information and, where appropriate, respect marketing consents. Transitional Data Sharing Agreements can help manage pre- and post-completion flows (for example, continuing to service orders while systems migrate).

Tax, Payments And Filings: Don’t Miss These Steps

Even small acquisitions have tax and filing elements to get right. Factor these into your budget and timetable.

• Stamp taxes on shares: stamp duty at 0.5% usually applies on share transfers (rounded to the nearest £5), payable to HMRC. You’ll need signed stock transfer forms stamped to update the register of members.
• VAT and TOGC: many asset sales of a trading business can be treated as a Transfer of a Going Concern (TOGC) if conditions are met, which can take the sale outside the scope of VAT. If not a TOGC, VAT may apply - build this into pricing.
• SDLT and local taxes: if property is included, Stamp Duty Land Tax and rates adjustments may be involved.
• Price adjustments: agree a clear method (for example, completion accounts or a locked box) for stock, cash/debt and working capital. Spell out how disputes are resolved.
• Companies House updates: on a share deal, ensure officer changes and PSC updates are filed by the deadlines, issue new share certificates and update statutory registers. See our overview on share certificates and member registers for good practice.

If you’re acquiring a minority stake or reorganising ownership among founders as part of a broader deal, consider whether a formal Share Transfer or shareholders’ documentation is needed to reflect the new ownership and rights.

Practical Tips To Keep Your Deal On Track

• Front-load the tough issues: identify consents, TUPE and lease hurdles at heads of terms. Surprises late in the process lead to delays and renegotiations.
• Prioritise due diligence: focus on the revenue engine (top customers, supply chain and margins), compliance hotspots and anything that can’t be fixed after completion.
• Use targeted indemnities: where diligence reveals specific risks, negotiate indemnities rather than relying solely on general warranties.
• Map your day-one operations: bank access, payment gateways, insurance, IT systems and licenses should be ready so you can trade smoothly on completion.
• Document the “transition services”: if the seller is helping for a short period post-completion (for example, introductions, accounting handover), set this out in writing with scope, duration and fees.

Key Takeaways

• Choose the right structure up front: a share purchase offers continuity but includes all company liabilities; an asset purchase lets you cherry‑pick assets but needs more consents.
• Run structured legal diligence: address corporate, contracts, employment (including TUPE), IP, leases, data protection and regulatory issues before you commit. A tailored Legal Due Diligence Package can surface risks early.
• Protect yourself in the paperwork: use a robust Business Sale Agreement or Share Sale Agreement with clear warranties, indemnities, limits and disclosure mechanics.
• Plan for people, premises and IP: understand TUPE obligations, build time for lease assignments, and line up assignments to transfer trade marks and other IP.
• Nail completion logistics: use a practical Completion Checklist, agree price adjustments, and don’t miss tax and Companies House filings (including any necessary Share Transfer documents).
• Get tailored advice: every deal is different. Early input from a lawyer and accountant will save time, cut risk and help you buy the business you think you’re buying.

If you’d like help buying an existing business - from due diligence and sale agreements to assignments and completion - you can reach us at 08081347754 or team@sprintlaw.co.uk for a free, no‑obligations chat.