Business Acquisition Plan for Buying an Existing Business

Buying an existing business gives you something a startup does not: real customers, operating history, and financial records. But those numbers only show how the business performed under the current owner.

Your business acquisition plan must explain what happens next: what will remain the same, what will change after closing, how you will finance the purchase, and whether the business can continue covering its expenses and debt under your ownership.

That means separating verified seller information from your own assumptions instead of simply repeating the listing or the seller’s projections.

In this guide, I’ll walk you through what to gather and how to write each section of a practical business plan for buying an existing business.

What to gather before you write a business acquisition plan?

The quality of your plan depends on having the seller’s real numbers, not your estimates, so this step isn’t optional.

Here’s what to get from the seller, and what each one is actually for:

• Three years of financials and tax returns to confirm the revenue and profit are real, not just what’s on the listing.
• The asking price and how the seller set it, which tells you whether it’s tied to earnings or pulled from the air.
• A revenue breakdown by customer and service to show whether the business leans on one or two clients who could walk.
• The customer and supplier list, including who the biggest accounts are, how long they’ve stayed, and which suppliers the business can’t operate without.
• Contracts and leases, which reveal what transfers to you and what expires the day you take over.
• Employee roles and compensation, so you know what the payroll actually costs and who the business would struggle to replace.
• Inventory and asset lists, the equipment, vehicles, and stock included in the sale, with their condition and age.
• Debts, licenses, and permits to flag any liabilities and whether you can legally operate from day one.
• The transaction details, the proposed deal structure, what the seller expects at closing, and whether they’d finance part of it.
• The reason the owner is selling, the single most useful sentence in the whole deal.

In small-business acquisitions, incomplete records are one of the most common reasons deals fall apart in due diligence. So treat the gaps as findings. If the seller can’t provide clean statements, every number they’ve quoted you is unverifiable.

If they stay vague about why they’re selling, keep asking until the answer holds up. Better to catch it now than after you’ve paid for a lawyer and a lender.

Once you’ve got all that, the next question is where each piece of it belongs in the plan.

What goes in a business plan for buying an existing business?

Most business plans for buying an existing business typically cover these ten sections:

However, the exact structure varies with the lender/investor, the size of the deal, and whether some sections get combined.

How to write a business acquisition plan?

A business acquisition plan uses many of the same sections as a standard business plan, but the emphasis is different. Since the business is already operating, you can use its financial history, customers, team, and operations to support your plan.

Focus most on the business’s past performance, how the purchase will be financed, your role after closing, and how ownership will transfer. These are the areas readers (a lender, an investor, a partner) are most likely to examine closely.

Here’s how to build each section of the plan:

Open with the acquisition summary (Executive summary)

The executive summary is the first thing anyone reads, and sometimes the only thing. So it has to cover the most important aspects of the business in under a page. Include these points:

• The business: Name, location, industry, and what it offers.
• The price and structure: The proposed price, what is included, and whether it is an asset or equity purchase.
• The financing: The rough fund amount split between loan, seller note, and your own cash.
• Financial performance: A brief summary of recent revenue, earnings, and other important financial trends.
• Why the acquisition makes sense: One or two honest sentences.
• What you bring to it: The experience or skills that make you capable of running this business.
• Transition priorities: The short version of what changes once you own it.

If I were acquiring an HVAC company, here’s how I’d write mine. I’ll use this same example throughout the rest of the article.

I’m acquiring Summit Air, an HVAC installation and repair company in Boise, Idaho, for $360,000, structured as an asset sale. The business has run for 14 years and did $500,000 in revenue last year with $120,000 in seller’s discretionary earnings. I’m funding it with a $270,000 SBA 7(a) loan, a $54,000 seller note, and $36,000 of my own cash.

I’m buying it for its recurring maintenance contracts and its established technician team. I’ve spent nine years in commercial HVAC, the last four managing a service crew of twelve, so the operations side is familiar ground. My first 90 days are about keeping those contracts and that crew in place through the ownership change.

Notice there’s no build-up and no selling. This summary needs to give a clear overview of the acquisition before the supporting details appear later in the plan.

Explain the company and acquisition overview

This section describes the business as it runs today, then what changes when you take over. The first half anyone could write from the seller’s paperwork. The second half is where you show you’ve thought about owning it.

Keep the description quick. Cover:

• What the business is, how long it’s run, its legal structure and location.
• What it sells, who buys it, and where the revenue comes from.
• What’s included in the sale, the assets, contracts, and equipment transferring to you.
• How long the biggest customers have stayed. A ten-year client and a ten-month one tell you very different things about how stable the revenue is.
• Why the seller is leaving, in their words if you can. A reader who doesn’t see it addressed assumes you didn’t ask.

Then the half that makes this an acquisition overview rather than a company description. Say what ownership looks like after closing, and be specific about what you’ll leave alone and what you’ll change.

“Keeping the team and the service model, moving scheduling onto software in month two” tells a reader more than “modernizing operations.” You’re showing you know which parts are working and shouldn’t be touched, and which have room to improve.

Cover the market and competitive analysis

A startup has to prove a market exists. But you don’t have to, as this business already has customers and a sales history. So your job here is narrower and more useful: to explain whether there will still be enough demand after you take over, or whether it’s quietly working against you.

Start with the business’s recent sales, customer retention, pricing, and service area. Use this information to see whether demand is growing, stable, seasonal, or declining.

Then compare it with current local conditions, such as customer needs, market activity, regulations, rising costs, or other changes that could affect future sales.

Next, name the main competitors and the other choices customers have, and be honest about why this business wins some jobs and loses others. Back it up with real evidence, customer reviews, what competitors charge, differences in service, and whatever the seller can tell you.

Then close by saying what all of it means for the purchase. Is the business in a strong spot or starting to fall behind? Name what you’ll protect and what you’ll improve once it’s yours.

Break down the products, services, and revenue streams

This section shows where the money actually comes from, and which parts of it are worth keeping. Section 2 said what the business sells. Here you look at each product/service, and explain which are most profitable, predictable, and likely to continue after the sale.

For each revenue stream, cover:

• What share of total revenue it brings in.
• Current pricing and when prices were last reviewed.
• Its gross margin, so you can tell a line that’s profitable from one that’s just busy.
• Whether the revenue is recurring, seasonal, or one-time. This matters more than the raw dollar figure.
• Whether customers or contracts are likely to stay after the sale.
• Any dependence on a major customer or the seller personally.

Do not combine everything into one revenue figure. Breaking it down helps readers see which parts of the business produce steady income and which are less reliable or operate on thin margins.

Then explain what you plan to do with each major revenue stream after closing. Some may remain unchanged, while others may need repricing, cost reductions, further investment, or gradual phase-out.

Base these decisions on verified margins, customer demand, and the risk of losing revenue during the ownership transition.

Plan the customer retention and growth plan

Start by explaining how the business currently attracts and keeps its customers. That tells you what’s at risk when the seller leaves and how to protect existing revenue.

Look at repeat purchases, contracts, referrals, online leads, partnerships, and any other channels that regularly bring in work. This helps you see which customer relationships are likely to continue and which may depend heavily on the seller’s personal relationships.

Then state how you will reduce that risk during the ownership change. That might involve seller introductions, account handovers, clear communication, continued service, or renewal discussions.

Next, describe how you plan to grow. Begin with the marketing and sales channels that already work. Then say how you will keep them running before adding new services, marketing campaigns, or price changes.

And yes, for each new initiative, include the expected cost, when you plan to introduce it, and the result you reasonably expect.

Map out the operations and transition plan

This section covers how the business runs day to day, and how you take it over without disrupting customers, employees, or routine work.

Describe what you’re inheriting:

• The daily operating process, how work gets done from enquiry to invoice.
• Location and facilities, and whether the premises are owned or leased.
• Equipment and inventory, including age and condition.
• Technology and systems, anything the business would stop without.
• Suppliers, particularly any that would be hard to replace.
• Licenses and permits, and whether they transfer or need reissuing.
• Quality and service standards, what customers expect every time.

Then outline the transition, the part most buyers miss. It starts before you sign. Anything you’ll want from the seller (access to systems, introductions, and any training) is easier to secure while the deal still depends on your signature, so the timeline starts there, not on day one.

Here’s how the whole transition maps out, from what you lock in before closing through the first ninety days of ownership.

The exact timeline will vary. But your plan should clearly show that you’ve thought through how ownership will transfer and how the business will continue operating throughout the transition.

Set out the organization and management plan

This section shows who will run the business after the seller walks out.

First, explain the seller’s current role. List everything they personally handle, in detail: sales, scheduling, the books, key customer relationships, whatever it is. This matters more than any other thing in the section, because the seller’s work has to go somewhere the day they leave.

Then describe the employees who will remain with the business. Include their main roles, experience, and any skills or licences that would be difficult to replace. You do not need to describe every employee in detail; focus on the people the business depends on most.

Then draft the organization structure: who reports to whom, and how the team is organized once you take over. Show it as it stands now and how it changes.

Next, clarify what you’ll do. Whether you’re running the business day to day, stepping into the seller’s role entirely, or hiring a manager while you oversee.

Be specific about the gap between what the seller does now and what you’ll actually take on, because that difference is where new costs appear. If the seller keeps the books and you won’t, you’re paying a bookkeeper, and that belongs in your numbers.

Finally, explain how you plan to retain key employees during the transition. This may include early communication, clear roles, pay reviews, retention bonuses, or other arrangements where appropriate.

Build the financial plan

A normal financial plan projects forward from nothing. But the acquisition financial plan starts with the seller’s real trading history, so you’re verifying and adjusting real numbers before you project anything. Cover these most essential parts.

Historical financial performance

Start by laying out three years of the seller’s financials exactly as they are. Show revenue, gross margin, and net profit for each year, side by side, so anyone reading can follow the trend.

For our example (Summit Air), that looks like this:

Three years of steady growth, which is exactly what you want to see. If there’d been a dip or a spike in there instead, you’d leave it in and explain it, because a number you’ve quietly smoothed over is the first thing someone will ask about.

Normalized earnings

The seller’s net profit isn’t what the business will earn for you, because it includes things you won’t inherit. Their salary, personal costs run through the business, one-time expenses, depreciation, or owner-related expenses that won’t continue after the sale.

These are called add-backs because they’re added back to the reported profit to estimate the business’s normal earnings. The result is often referred to as the seller’s discretionary earnings (SDE).

Here’s how Summit Air’s $92,000 net profit becomes its SDE:

That $120,000 is what your valuation and financing are built on, not the $92,000 on the tax return.

Present your add-backs as a line-by-line schedule like this, not a single lump sum, because a lump sum is impossible to check. And be honest about the ones that aren’t really add-backs. If you’d be running a vehicle too, that $6,000 stays out of the add-backs and your SDE comes down accordingly.

Sources and uses of funds

Now, show a straight statement of where the money comes from and where it goes. The two sides have to balance.

For Summit Air’s $360,000 purchase:

Working capital is the line buyers most often forget. Buying the business is one number; keeping it running until the first invoices clear is another, and it’s real money you need on day one.

Post-acquisition projections

Next, use the seller’s recent performance and the adjusted earnings as the starting point for a three-year forecast.

For the first year, reflect what will change after the acquisition. Include new costs such as bookkeeping, your salary, additional staff, and loan payments, along with any expenses that will no longer continue.

Keep growth assumptions tied to something real. “6% from refrigeration work the customers already ask for” is believable. “15% from better marketing” casts doubt on the whole plan.

Then show cash flow month by month, not just yearly. A slow winter can leave you short the month a payment is due, and a reader wants to see the business covers its debt even in its weakest stretch.

Add risk analysis and contingency plan

Buying a business means inheriting its risks, not just its revenue. This section helps you identify the problems that could affect sales, operations, or debt repayment and explain how you would handle them.

For every risk you name, cover four things.

• Why it applies here, tied to something specific about this business.
• How you’ll reduce it before it becomes a problem.
• The warning sign that tells you it’s happening.
• What you’ll do if it happens anyway.

Don’t invent these from scratch. The real risks are already sitting in the work you’ve done. That could be in the financial review, due diligence, customer analysis, and transition plan. Pull them from there.

Common acquisition risks could be:

Not all of these will apply. Include the ones that genuinely apply to your business and work them through properly, rather than listing generic risks and saying little about them.

Exit planning is worth including if you’re raising investment, since investors want to know how they eventually get their money out. For a lender-focused plan, it’s usually unnecessary, so leave it out unless you’re asked.

Appendix

The appendix holds the documents behind everything you’ve claimed in the plan. Anyone who wants to check a figure/claims should find the source here rather than having to ask you for it.

Include:

• Three years of financial statements and tax returns, the basis for your earnings figures.
• The add-back schedule, itemised, showing how you reached normalised earnings.
• Key contracts and the lease, with renewal dates and transfer terms.
• The customer and supplier list, summarised if the seller wants details kept confidential.
• Equipment and inventory schedules, noting age and condition.
• Licenses, permits, and registrations, plus confirmation they transfer.
• Financing pre-approvals or letters of intent, if you have them.
• Employee details and any retention agreements, covering roles, tenure, and pay.

Keep it tight. Just include documents that support specific information you’ve written in the plan. Label them clearly so readers can easily find the details they need.

Overall, these 10 steps let you build a strong acquisition business plan that connects the seller’s past performance with your ownership plan. The verified earnings set the valuation, the valuation shapes the financing, and the transition plan protects the business after the sale.

A faster way to build your acquisition plan

You now have the structure needed to turn the seller’s records, your financing, and your plans for the business into one clear acquisition plan. Work through each section using information you can verify.

The key is to keep the information consistent as the deal changes, especially the purchase price, funding, and financial projections.

You can build each section manually using the steps above. But organizing the seller’s information and keeping every figure updated can take time. That’s where Upmetrics can make the process easier.

It lets you import an existing business plan or start a new one, then update it for the acquisition with its AI assistance and built-in financial forecasting. Plus, you can revise the plan and projections together instead of managing them across separate files.