How to Evaluate a Small Business Before You Buy It
A Plain-English Guide to Initial Business Evaluation for First-Time Buyers
5 min read • February 2026
You found a business you like. The industry makes sense. The owner seems motivated to sell. Your gut says this could be the one.
Now what?
This is where most first-time buyers get overwhelmed. Terms like “due diligence,” “EBITDA,” and “quality of earnings” start flying around, and if you don’t come from a finance background, it can feel like you need a CPA and an MBA just to figure out if a deal is worth pursuing.
You don’t. You need to understand a handful of core concepts, ask the right questions, and know when to bring in an expert. That’s what this guide is for.
If you’re still building your foundation in ETA, start with our overview: What Is Entrepreneurship Through Acquisition? It covers the full model before we get into the deal evaluation details here.
Note: This is an introduction to business evaluation, not a substitute for professional advice. Before closing any acquisition, work with a qualified CPA and attorney with experience in small business transactions.
Start With One Number: Seller’s Discretionary Earnings (SDE)
When you’re evaluating a small business as an individual buyer, the most important number isn’t revenue. It’s Seller’s Discretionary Earnings, or SDE.
SDE is essentially what the business puts in the owner’s pocket every year. It’s calculated by taking the business’s net profit and adding back the owner’s salary, personal expenses run through the business, one-time costs, and non-cash items like depreciation. Think of it as the true economic benefit of owning the business.
A simple example:
Business net profit: $150,000
Owner’s salary (added back): $80,000
Owner’s personal cell phone, car, travel (added back): $20,000
One-time legal expense (added back): $10,000
SDE = $260,000
Why does this matter? Because small businesses are typically priced as a multiple of SDE. According to BizBuySell’s 2025 Insight Report, the median small business sold for $350,000 in 2025, with the average cash flow multiple rising to 2.57x. A business with $260,000 in SDE might be listed for 2.5x to 3.5x — or $650,000 to $910,000 — depending on industry, growth trend, and risk profile.
The first question to ask on any deal: “What is the SDE, and how was it calculated?” If the seller or broker can’t clearly explain the add-backs, that’s a red flag.
What to Actually Look At in the Financials
Your initial request should include three years of tax returns and profit & loss statements (P&Ls) during the due diligence process. Here’s what to focus on, even without a finance background:
Revenue Trend
Is revenue going up, flat, or declining? A business with three years of steady or growing revenue is much lower risk than one that peaked two years ago and is now shrinking. Don’t just look at the most recent year… look at the direction.
Revenue Consistency
Is revenue predictable month to month, or does it swing wildly? Businesses with recurring contracts or repeat customers — like service businesses, subscription models, or maintenance agreements — are generally more stable and easier to operate than those dependent on one-time project work.
Profit Margins
After all expenses, what percentage of revenue is left? A business generating $1M in revenue but only $50,000 in profit has a 5% margin — very thin, and very little cushion if anything goes wrong. Compare margins to industry benchmarks. Your CPA can help you run this comparison.
Owner Add-Backs: Are They Legitimate?
Sellers often “add back” expenses to make the business look more profitable than it appears on paper. Some add-backs are completely legitimate — like the owner’s salary or a one-time equipment purchase. Others are aggressive or misleading. Ask for documentation on every single add-back. If something can’t be verified with a receipt or a clear explanation, push back.
The Biggest Risk Most First-Time Buyers Miss: Owner Dependency
This is the single most common deal-killer in small business acquisitions, and one of the hardest things to spot if you don’t know to look for it.
Owner dependency means the business’s revenue, relationships, or reputation are deeply tied to the outgoing owner. The owner knows all the customers personally. The owner has the key vendor relationships. The owner IS the brand. If that owner leaves, what actually stays?
Questions to ask:
What percentage of revenue comes from the top 3 customers? (High concentration = high risk)
What are the owner’s roles and responsibilities?
Is the owner willing to stay on for a 6–12 month transition period?
Does the business have employees who can operate independently, or does everything run through the owner?
If the owner goes on vacation for 2 weeks, who runs the show and does the business continue to operate smoothly?
A business with $400,000 in SDE that falls apart when the owner leaves is worth far less than it appears on paper. Owner dependency must be evaluated honestly before you ever submit a Letter of Intent.
Customer Concentration: Don’t Buy a One-Client Business
This deserves its own section because it’s that important. Customer concentration risk is when a large percentage of a business’s revenue comes from a small number of clients.
The general rule: if any single customer represents more than 20% of revenue, you have concentration risk. If one customer is 40–50% of revenue, most SBA 7(a) lenders won’t touch the deal, and you probably shouldn’t either, unless there’s a long-term contract in place.
Ask for a customer revenue breakdown as early in the process as possible. It’s a basic question and any legitimate seller should provide it (under NDA).
Red Flags to Watch For
Even without a financial background, these are warning signs any buyer can spot:
Tax returns don’t match the P&L. If the numbers the broker shows you don’t line up with what was reported to the IRS, there’s either creative accounting or something is being hidden.
The seller is vague about why they’re selling. “I want to retire” is fine. Dodging the question or giving a different answer each time you ask is not. “Pursuing other business opportunities” should give you as a buyer pause to understand why.
Revenue is heavily concentrated in one or two clients. See above.
Key employees are likely to leave. If the business depends on 1–2 employees who aren’t under contract and may leave post-sale, that’s a material risk.
The business has been on the market a long time. Ask why. Sometimes it’s overpriced. Sometimes buyers found something in due diligence.
Pressure to move fast. Legitimate sellers understand that buyers need time to evaluate properly. High-pressure tactics are a bad sign.
How SBA Financing Factors Into Your Evaluation
Most self-funded ETA acquisitions are financed using an SBA 7(a) loan — the government-backed program that allows buyers to finance up to $5M for qualifying deals with as little as 10% equity injection. Understanding how SBA lenders evaluate a deal changes how you should evaluate it too.
SBA lenders will scrutinize the same things you should: three years of tax returns, a stable revenue trend, manageable customer concentration, and a business that can generate enough cash flow to service the debt. If a deal wouldn’t pass a basic lender review, it probably shouldn’t pass yours either.
For a deeper look at how this path is typically structured, see our post on Self-Funded Search vs. Traditional Search Fund, which covers the capital structure decisions that come before evaluation.
Important: SBA financing requires a personal guarantee. You are personally liable if the business cannot service the debt. This is not a reason to avoid SBA loans — it’s a reason to evaluate every deal with full honesty about the downside.
When to Bring in a Professional
You don’t need to hire a team of advisors for an initial screening, but once a deal gets serious (post-LOI, during formal due diligence), you need two professionals on your side:
A CPA with small business acquisition experience to review the tax returns, verify the financials, and flag anything that doesn’t add up. Not your personal accountant — someone who has done this before.
An attorney familiar with business purchase agreements to review the Asset Purchase Agreement (APA) and protect your interests in how the deal is structured.
Professional fees on a small business acquisition typically run $5,000–$15,000 combined. That’s a rounding error relative to what’s at stake in a $500K–$2M transaction.
The Acquiring Minds podcast is also a practical resource — real operators share what they wish they’d known during due diligence, across dozens of actual acquisitions. Worth listening to before you get serious on any deal.
A Simple Evaluation Checklist for First-Time Buyers
Before submitting a Letter of Intent on any deal, you should be able to check each of these:
I understand how SDE was calculated and have verified the key add-backs
Revenue has been stable or growing over the past 3 years. Or if revenue has declined, there an explicit reason why and you believe it is fixable
I understand why the owner is selling
The business can operate without the owner present day-to-day
Tax returns and P&Ls are consistent with each other
I have verified customer concentration is at an acceptable level
I have a CPA and attorney lined up for formal due diligence
The Bottom Line
Evaluating a small business before you buy it isn’t about being a financial expert. It’s about asking the right questions, understanding what the numbers are actually telling you, and knowing which risks are acceptable and which are deal-breakers.
Most deals that go bad for first-time buyers weren’t obviously bad from the start — they were deals where the buyer moved too fast, took the seller’s numbers at face value, or ignored warning signs because they were emotionally attached to the outcome.
Slow down. Verify everything. And never fall so in love with a deal that you stop being honest about what you’re actually buying.
If you haven’t yet mapped out how you’ll find deals to evaluate in the first place, read our guide: How to Find a Business to Buy.
Key Takeaways:
SDE (Seller’s Discretionary Earnings) is the most important valuation metric for small businesses
Look at 3 years of financials — trend and consistency matter as much as the most recent year
Owner dependency is the most underestimated risk in small business acquisitions
Customer concentration above 20% for any single client is a material deal risk
Verify every add-back — not all of them are legitimate
SBA 7(a) financing requires a personal guarantee — evaluate deals with full awareness of the downside
Hire a CPA and attorney before closing — it is not optional