Question

How do you buy an existing business, and what should you check?

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Answer

Through a structured process — identify, value, offer subject to due diligence, investigate, negotiate, complete — and the investigation stage is where the real work is, because what you are buying is rarely what the seller has described.

The two structures, which have very different consequences:

Asset purchase. You buy specific assets — equipment, stock, goodwill, contracts — leaving the legal entity with the seller. Liabilities generally stay behind, which is why buyers prefer it. Contracts and leases may need consent to transfer, and employees usually transfer automatically with their existing terms and continuity of service under employment transfer rules.

Share purchase. You buy the company itself, and therefore everything in it — including liabilities you have not discovered. Simpler operationally, riskier legally, and normally preferred by sellers for tax reasons.

What due diligence must actually cover:

Financial. Verified accounts, management accounts, and critically the quality of earnings — whether profits are recurring or flattered by one-offs. Check debtor ageing, stock valuation and whether the owner has been taking an unrealistically low salary, which inflates apparent profit.

Customer concentration. A business where one client is a large share of revenue is far riskier than the headline suggests.

Owner dependence — the most commonly fatal issue. If the customers, the supplier relationships and the technical knowledge live in the departing owner's head, you may be buying very little.

Legal. Contracts, leases, litigation, licences, intellectual property ownership, and whether key contracts have change of control clauses allowing the other party to walk away.

Employment. Terms, liabilities, disputes, pensions.

Tax, including historic compliance, which follows the company in a share sale.

How the risk is managed: warranties and indemnities in the agreement, a retention held back, and an earn-out tying part of the price to future performance — which also keeps the seller engaged.

Agree the handover explicitly, including how long the seller stays and what introductions they make.

General information, not legal or financial advice.

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