How to Buy a Small Business: Due Diligence, Deal Structure, and What Can Go Wrong

Buying an existing business can be one of the smartest moves an entrepreneur makes. Instead of spending years building revenue from zero, you acquire a going concern with customers, cash flow, employees, and systems already in place. The success rate for business acquisitions is higher than for startups. The path to profitability is shorter. On paper, it's a no-brainer.

In practice, buying a business is one of the most complex transactions you'll ever do, and the ways it can go wrong are numerous and expensive. Let me walk you through what the process actually looks like and where the landmines are buried.

Asset Purchase vs. Stock Purchase: The First Big Decision

When you buy a business, you're either buying the company's assets or buying the company itself (its stock or membership interests). This distinction affects everything — taxes, liability, contracts, employees, and how much you ultimately pay.

Asset purchase: You're buying specific things — the equipment, inventory, intellectual property, customer list, goodwill, maybe the lease and the trade name. You're not buying the legal entity. The seller keeps the corporate shell and any liabilities attached to it. This is almost always what buyers prefer, because you get to cherry-pick what you want and leave behind what you don't — including any unknown liabilities, pending lawsuits, or tax problems the business might have.

Stock purchase: You're buying the entity itself — the corporation or LLC. Everything comes with it, including every asset, every contract, every liability, every obligation, every skeleton in the closet. Buyers generally don't love stock purchases because they inherit all the risk. Sellers generally do love them because they get a cleaner exit and often better tax treatment (capital gains on the sale of stock, rather than the mixed treatment that asset sales produce).

Most small business acquisitions are structured as asset purchases. The seller pushes for stock; the buyer pushes for assets; they negotiate. The structure you choose should be driven by tax analysis and risk allocation — not by which party's attorney drafts the first version of the letter of intent.

Due Diligence: The Part That Saves You (or Sinks You)

Due diligence is the process of verifying that what the seller told you is actually true. It sounds boring. It is boring. It's also the most important phase of the entire transaction. Every bad acquisition I've seen — without exception — involved inadequate due diligence.

At minimum, you need to review three years of tax returns (not internal financial statements — actual filed tax returns, because people don't usually lie to the IRS); accounts receivable aging (how much is owed, by whom, and how old the receivables are — aging receivables are often uncollectable); all material contracts (customer agreements, vendor agreements, leases, loan agreements) to confirm they're assignable and won't terminate on a change of ownership; employment records and any pending or threatened claims; intellectual property ownership documentation; environmental liabilities if the business involves real property; and litigation history, both current and threatened.

Valuation: What's the Business Actually Worth?

There are multiple ways to value a small business, and the "right" method depends on the business type. The most common for small businesses is a multiple of seller's discretionary earnings (SDE) — which is net income plus the owner's salary, benefits, one-time expenses, and any other add-backs that normalize earnings to show what a new owner would actually take home.

Most small businesses sell for 2–4x SDE, with the multiple varying based on industry, growth trajectory, customer concentration, how dependent the business is on the current owner, and the overall risk profile. A business that runs itself sells for a higher multiple than a business where the owner is the entire operation.

Don't fall in love with a business before you've done the math. The price has to make sense given the cash flow, and the cash flow has to be sustainable under your ownership. If the seller's personal relationships account for 60% of revenue and those relationships won't transfer to you, the business isn't worth what the seller thinks it is.

Financing: Where the Money Comes From

Most small business acquisitions are financed through some combination of SBA loans, seller financing, and buyer equity. An SBA 7(a) loan can cover up to 90% of the purchase price, with terms up to 10 years. The SBA doesn't lend directly — it guarantees loans made by participating lenders, which makes banks more willing to lend on acquisitions.

Seller financing is common and often expected. The seller carries a note for a portion of the purchase price — typically 10–30% — payable over 2–5 years. This serves two purposes: it reduces the cash you need upfront, and it keeps the seller financially motivated to help with the transition. If the business fails because the seller misrepresented something, you stop paying the seller note. It's a natural alignment of incentives.

The buyer's equity injection is usually 10–20% of the purchase price in cash. Between SBA financing and seller financing, you can acquire a business with less out-of-pocket cash than most people assume. The key is strong financials — both the target business's historical performance and your own personal financial position.

The Closing and Beyond

The purchase agreement is the document that governs everything. It should include detailed representations and warranties from the seller (statements of fact about the business that the seller guarantees are true), indemnification provisions (the seller's obligation to cover your losses if those representations turn out to be false), a working capital adjustment (so you're not paying for inventory or receivables that don't actually exist at closing), and some form of holdback or escrow (a portion of the purchase price held in escrow for 12–18 months to cover any post-closing claims).

Do not buy a business without an experienced business attorney reviewing (or drafting) the purchase agreement. This is a transaction where the cost of legal counsel — typically $5,000–$15,000 for a small acquisition — is trivial compared to the cost of a bad deal. The purchase agreement is the only document that protects you after the ink dries.