If you are evaluating a small business for the first time, you will encounter two earnings metrics almost immediately: Seller's Discretionary Earnings (SDE) and EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization). They sound similar. They measure related things. And using the wrong one will distort your valuation in ways that could cost you tens of thousands of dollars.
The distinction is not complicated, but it is frequently misunderstood, and the consequences of getting it wrong are real.
What SDE Measures
Seller's Discretionary Earnings represents the total financial benefit available to a single owner-operator. It answers a specific question: if I buy this business and run it myself, how much money flows to me?
The formula:
SDE = Net Income + Owner's Salary + Owner's Benefits + Interest + Taxes + Depreciation + Amortization + Non-Recurring Expenses + Other Discretionary Expenses
The critical element is that SDE adds back the owner's entire compensation package. Salary, payroll taxes, health insurance, car payments, cell phone, meals, travel, personal expenses run through the business, retirement contributions. All of it. The assumption is that you, the buyer, are going to replace the current owner and do their job. So the owner's total compensation is "earnings" available to you.
SDE also adds back interest (because you will have your own financing structure), taxes (because your tax situation will differ), depreciation and amortization (non-cash charges), and any one-time or non-recurring expenses that will not repeat under new ownership.
What EBITDA Measures
EBITDA measures the earnings of the business as an operating entity, independent of any single owner. It answers a different question: what does this business earn before financing costs, taxes, and non-cash charges, assuming it pays a market-rate manager to run operations?
The formula:
EBITDA = Net Income + Interest + Taxes + Depreciation + Amortization
The key difference: EBITDA does not add back the owner's salary. Instead, it assumes the business is paying (or will pay) a market-rate replacement manager. If the current owner pays themselves $80,000 but a replacement manager would cost $130,000, EBITDA reflects the higher cost. If the owner pays themselves $200,000 but market rate for their role is $120,000, the excess $80,000 gets added back as an adjustment, but the $120,000 stays as an operating expense.
In practice, what you see on most listings is "Adjusted EBITDA," which takes reported EBITDA and normalizes it for above-market owner compensation, one-time expenses, and other items that distort operating performance.
The Relationship Between SDE and EBITDA
Here is the key insight that most guides bury or skip entirely: SDE and EBITDA are different lenses on the same business. They should produce the same valuation when applied correctly. The difference is in the multiple, not the value.
Consider a business with:
- $300,000 in SDE
- A market-rate replacement manager costing $120,000
The EBITDA for this business is $300,000 minus $120,000 = $180,000.
If the business sells for $750,000, that is 2.5x SDE or 4.2x EBITDA. Both multiples describe the same purchase price. The SDE multiple is lower because SDE is a larger number (it includes the owner's comp). The EBITDA multiple is higher because EBITDA is a smaller number (it deducts the manager's cost).
Problems arise when people mix up the metrics. If you see a business listed at "3x EBITDA" but the broker actually calculated SDE and mislabeled it, the business is overpriced by the entire cost of a replacement manager multiplied by 3. On a business where manager replacement costs $120,000, that mistake inflates the price by $360,000.
When to Use Which
The dividing line is roughly $1 million in earnings, and whether the business requires an owner-operator or can run under professional management.
Use SDE when the business has less than approximately $1 million in earnings, the current owner works in the business full-time, and the buyer intends to replace the owner and operate the business themselves. This describes the vast majority of small business acquisitions under $5 million in purchase price.
Use EBITDA when the business generates more than approximately $1 million in earnings, has a management team in place (or needs one), and the buyer does not intend to be the day-to-day operator. This is more common in lower middle-market transactions, private equity acquisitions, and businesses with institutional-quality management.
There is a gray zone between roughly $750,000 and $1.5 million in earnings where both metrics are used. In this range, it matters a great deal which metric the broker or seller is using, because confusing the two will produce meaningfully different valuations.
Common Mistakes and How to Avoid Them
The most dangerous mistake is applying an EBITDA multiple to an SDE number, or vice versa. SDE multiples for small businesses typically range from 1.5x to 4.0x. EBITDA multiples for the same businesses, when properly calculated, are higher because the denominator is smaller. Applying a 4x EBITDA multiple to an SDE figure inflates the valuation by the full cost of owner replacement multiplied by the multiple.
The second most common mistake is accepting add-backs without scrutiny. Sellers and brokers have an incentive to maximize SDE by adding back as many expenses as possible. Some add-backs are legitimate (the owner's salary, a one-time lawsuit settlement). Others are questionable (a "discretionary" marketing budget that the business actually needs to maintain revenue). And some are outright fraudulent (adding back expenses that do not exist or inflating personal expenses run through the business).
Every add-back should be documented, found in the financial records, and defensible. If you cannot verify an add-back with source documents (tax returns, bank statements, receipts), do not accept it.
The third mistake is ignoring the replacement cost of the owner. Even when using SDE correctly, you need to understand what it costs to replace the owner's labor. If the owner works 60 hours a week and the SDE is $200,000, but replacing their labor would cost $150,000, your actual economic benefit as an absentee owner is only $50,000. The SDE number is real, but it assumes you are willing and able to do the owner's job.
A Practical Test
When you encounter a listing, ask yourself three questions:
Does the earnings figure add back the owner's full compensation? If yes, it is SDE (or should be). If no, it may be EBITDA, but verify.
What would it cost to hire someone to do the owner's job? This is the bridge between SDE and EBITDA. If SDE minus replacement manager cost equals a negative number or a very thin margin, the business may not support an absentee owner.
Which multiple range is being used? SDE multiples and EBITDA multiples are different ranges for the same reason. Make sure the multiple matches the metric.
References and Sources
- International Business Brokers Association (IBBA), "Understanding SDE and EBITDA in Business Valuation"
- Shannon Pratt, Valuing a Business: The Analysis and Appraisal of Closely Held Companies, 5th Edition, McGraw-Hill
- BizBuySell, "Insight Report", quarterly data on transaction multiples by earnings metric
- Pepperdine Graziadio Business School, "Private Capital Markets Report"
- DealScorer in-depth analysis of real small business listings