How to Buy an Existing Business: A Step-by-Step Guide

By MercConsulting · Published 2026-07-19

A step-by-step guide to buying an existing business: sourcing deals, due diligence, financing, deal structure, and avoiding the mistakes that sink acquisitions.

Buying an existing business means acquiring a company that already has revenue, customers, employees, and operating history, instead of building all of that from zero. The process runs through five stages — defining your target, sourcing and screening deals, due diligence, financing and deal structure, and closing with a transition plan — and typically takes three to nine months for a small or mid-size company. Done carefully, it can put you into positive cash flow on day one; done in a hurry, it hands you someone else's unresolved problems along with the keys.

Houston has no shortage of owners looking to sell — retirement, burnout, a partner buyout gone sideways, or an owner ready to hand off something solid. That's an opportunity only for a buyer who can evaluate a business honestly and structure a deal that protects them if the seller's numbers don't hold up. MercConsulting has advised Houston-area owners on formation, acquisition, and growth since 1998, and the pattern hasn't changed in 25-plus years: the deals that work are the ones where the buyer slowed down exactly when it felt easiest to speed up.

"I thought I was buying a book of clients. Three weeks after closing I found out half of them were already gone — the seller just hadn't updated the list before we signed."

Why Buy an Existing Business Instead of Starting One

Starting from scratch means building demand, hiring untested staff, and surviving on savings until revenue catches up to expenses. Buying an existing business skips most of that — if it's actually what the seller says it is.

• Immediate cash flow. A profitable business pays you, and your loan, from day one.
• Proven demand. Customers, contracts, and repeat revenue already exist — you're not guessing whether the market wants it.
• Trained staff and working systems. Employees who know the customers and workflow are worth more than most buyers realize.
• A financeable asset. Lenders underwrite a business with three years of tax returns far more comfortably than a startup with a business plan and a prayer.

The tradeoff is price and inherited baggage. You're paying for the head start, and taking on whatever the seller built — good habits and bad ones, clean books and messy ones. The rest of this guide is about finding out which you're getting before you sign anything binding.

The Acquisition Process, Step by Step

Due Diligence: What to Verify Before You Sign

Due diligence confirms, with documentation, that the business is what the seller represented. Sellers aren't always dishonest — sometimes they simply don't track the number you're asking about — but "I'm sure it's fine" is not evidence when your capital is on the line.

• Financial statements and tax returns. At least three years, cross-checked against bank statements, not just the seller's internal reports.
• Customer concentration. If one or two customers drive most of revenue, you're buying a fragile business no matter how healthy the top line looks.
• Contracts, leases, and vendor agreements. Confirm they're assignable and watch for change-of-control clauses that could terminate a contract at closing.
• Liabilities and liens. UCC filings, outstanding loans, litigation, and unpaid taxes can attach to the business — and in some structures, to you — if not caught before closing.
• Licenses and permits. Confirm what's required to operate legally and whether it transfers with the sale.
• Key-person risk. Identify who actually runs the business day-to-day and whether that knowledge leaves with the seller.

A quality-of-earnings review — checking whether reported profit reflects the business's real cash-generating ability, adjusted for one-time items and owner perks run through the company — is standard on larger deals and worth doing on smaller ones too. For the full document list and red flags to check before you sign, see our business acquisition due diligence checklist.

How to Finance the Acquisition

Most buyers combine more than one source rather than paying entirely in cash:

• SBA 7(a) loans are the most common financing vehicle for acquisitions, typically requiring a smaller down payment than a conventional bank loan over a longer term.
• Seller financing, where the seller carries a note for part of the price, signals confidence and gives you leverage if post-close performance falls short of what was represented.
• Earnouts tie part of the price to agreed performance targets after closing, bridging a valuation gap between buyer and seller.
• Personal capital and investor equity round out most deal structures, particularly for the down payment an SBA loan requires.

Whichever mix you use, get a financing pre-approval or a clear indication of terms before you submit an LOI. Sellers take offers from financed buyers less seriously when there's no evidence the money is actually available. If you're weighing an SBA loan against a seller note, see our side-by-side comparison of SBA loans vs. seller financing.

Deal Structure: Asset Purchase vs. Stock Purchase

Most small-business acquisitions are structured one of two ways, and the choice has real consequences for liability exposure and tax treatment on both sides.

• Asset purchase. You buy the specific assets and, typically, the goodwill of the business — not the legal entity itself. This generally limits your exposure to the seller's prior liabilities, which is why it's the more common structure for small-business deals.
• Stock (or equity) purchase. You buy the ownership interest in the entity itself, so its history — including liabilities and legal exposure — comes with it unless specifically carved out in the purchase agreement.

Before you close, decide what entity will actually hold the business going forward, and confirm that decision against the specific liabilities and licenses the target carries — not a generic rule of thumb. Getting it wrong is expensive to unwind after closing, so it belongs on the same punch list as diligence and financing, not an afterthought handled the week before signing.

Mistakes That Sink Acquisitions

Most failed acquisitions don't fail because the target was bad. They fail because of how the buyer approached the deal.

• Rushing due diligence to close faster, often because the buyer is emotionally attached to "winning" the deal.
• Trusting seller-provided financials without independently verifying them against bank statements and tax filings.
• Ignoring customer concentration because the top-line revenue number looks attractive.
• Undercapitalizing working capital — spending everything on price and leaving nothing to cover payroll during the transition.
• No transition plan or non-compete, so customers and employees have no reason to trust the new owner, and nothing stops the seller from opening down the street with those same relationships.
• Going it alone on a first deal. Advisors cost money up front; a bad deal costs far more.

When to Bring in Outside Help

A business broker can help you find deals. A CPA can review the financials. An attorney can negotiate the purchase agreement. What's often missing is someone coordinating all three and telling you honestly when the numbers don't support the asking price — even after you've fallen in love with the business.

MercConsulting has guided Houston owners through business formation, acquisition, and growth for over 25 years, and our portfolio of client work includes acquisitions where diligence changed the deal structure, the price, or the buyer's decision to walk away entirely. We also run the same AI-driven diligence and document-review tools internally that we bring to client engagements. See our acquisition consulting services or read more about why owners choose to work with us.

Frequently Asked Questions

How much does it cost to buy an existing business?

It depends on the business's size, industry, and earnings — small businesses typically sell for a multiple of annual cash flow, larger ones often off EBITDA multiples. The real question isn't a fixed number; it's whether the asking price is supported by verified earnings and comparable sales.

Is it better to buy an existing business or start one from scratch?

Buying gets you existing revenue, customers, and systems immediately, but costs more upfront and means inheriting the seller's history. Starting from scratch costs less initially but requires building demand and cash flow from zero — the right choice depends on your risk tolerance, capital, and timeline.

How long does it take to buy a business?

A typical small to mid-size acquisition takes three to nine months from initial search to closing, with due diligence and financing usually the longest stretches. Off-market or complex deals take longer; pre-approved financing can speed things up.

Do I need a lawyer to buy a business?

Yes. An attorney experienced in acquisitions should draft or review the purchase agreement, advise on deal structure, and help you understand what liabilities you're assuming — the cost of legal review is small next to an unenforceable non-compete or an unexpected liability.

What's the difference between an asset purchase and a stock purchase?

In an asset purchase, you buy specific assets and goodwill without automatically assuming the seller's prior liabilities. In a stock purchase, you buy the ownership interest in the entity itself, so its history — including liabilities and legal exposure — transfers with it unless specifically excluded. Most small-business deals use an asset purchase for this reason.

Should I use an SBA loan to finance an acquisition?

SBA 7(a) loans are the most commonly used financing tool for small business acquisitions because they typically allow a lower down payment and longer repayment term than a conventional bank loan. Whether it's the right fit depends on your qualifications, the target's financials, and how the SBA lender views the deal.

This article is for educational purposes only and is not legal, tax, or investment advice. Consult qualified professionals about your specific situation.