When a buyer and a seller sit down to talk about the value of a small business, the conversation almost always turns to one number. Not revenue, and not the profit that shows up on the tax return, but a figure called Seller's Discretionary Earnings, usually shortened to SDE. If you are buying or selling a business valued under a few million dollars, SDE is the number that most often determines the asking price, the loan you can secure, and whether the deal makes sense at all. Yet it is also one of the most misunderstood parts of a transaction, and misunderstanding it costs people money on both sides of the table.
The reason SDE matters so much is that the tax return of a privately held business rarely tells the true story of what the business earns. Owners run personal expenses through the company, they pay themselves in ways designed to reduce taxes, and they carry costs that a new owner would never incur. SDE is the tool that strips all of that away to reveal what the business actually produces for a single owner-operator. Learning how it is calculated, and where it gets abused, is one of the most valuable things a buyer or seller can do before entering a deal.
WHAT SELLER'S DISCRETIONARY EARNINGS ACTUALLY MEASURES
Seller's Discretionary Earnings represents the total financial benefit that one full-time owner-operator receives from a business in a given year. It starts with the net profit shown on the business tax return and then adds back items that do not reflect the ongoing operating cost of the company under a new owner. The goal is to answer a simple question. If you bought this business, worked in it yourself, and ran it the way a normal owner would, how much money would flow to you before debt payments and taxes?
That framing is important because it separates SDE from other measures of profitability. A larger business is usually valued on EBITDA, which stands for earnings before interest, taxes, depreciation, and amortization, and which assumes the owner is a passive investor paying a manager to run the company. SDE is built for the smaller end of the market where the buyer expects to work in the business full time. It adds back the owner's salary because the new owner will be drawing their own compensation from the same pool of earnings. For most Main Street businesses, the businesses that most of our clients buy and sell, SDE is the correct starting point.
Add-backs are the individual line items that get added to net profit to arrive at SDE. Some are completely standard and rarely disputed. Others are aggressive, questionable, or simply invented, and those are where buyers get hurt. Understanding the difference is the whole game.
The clean, widely accepted add-backs include:
Where things get complicated is with the add-backs that live in a gray zone. A seller might add back the full cost of a company truck when the business genuinely needs that truck to operate. They might add back an employee's wages by claiming the role is unnecessary, when in reality the work still has to be done by someone. They might describe recurring marketing spend as a one-time expense. Each questionable add-back inflates SDE, and because businesses sell for a multiple of SDE, every inflated dollar can raise the asking price by three or four dollars or more.
Consider a service business with $200,000 in net profit on its tax return. The owner pays herself a $90,000 salary, the business carries $15,000 in annual interest on a piece of equipment, and depreciation runs $25,000 a year. Those three items alone bring SDE to $330,000. So far this is normal and defensible.
Now the seller adds another $40,000 in claimed add-backs. She wants to add back her son's salary because she says the role is not essential, along with a chunk of vehicle and travel expense she describes as personal. That pushes stated SDE to $370,000. At a three times multiple, that extra $40,000 of add-backs raises the asking price by $120,000. If the son actually performs necessary work and a new owner would have to hire someone to replace him, then that add-back is fictional, and a buyer who accepts it at face value is overpaying by a large margin. This is exactly the kind of line that a buyer and their advisor need to test rather than accept.
The buyer's job is not to reject add-backs but to verify them. For every add-back on the seller's list, the right question is whether the expense will truly disappear or change once the business trades hands. If the answer is yes, the add-back is legitimate. If the answer is no, or if the expense simply shifts to a different owner, then it does not belong in SDE.
Buyers should ask for documentation behind each significant add-back. A personal expense claim should be traceable to an actual credit card statement or invoice. A one-time expense should be genuinely one time, verifiable across several years of financials rather than a recurring cost relabeled for the sale. When an add-back cannot be supported with a document, it should come out of the number, and the price should reflect the lower, defensible SDE. This is where the quality of a buyer's advisory team shows, because a trained eye catches inflated earnings that an eager first-time buyer will miss.
Sellers benefit from the same discipline, just from the other direction. The instinct to inflate SDE to justify a higher price almost always backfires, because a serious buyer will conduct due diligence, and a bank will conduct its own analysis before funding the loan. When a lender's underwriter recalculates SDE and finds it lower than what supported the asking price, the financing falls short and the deal either collapses or reprices at the worst possible moment, after both sides have spent time and money.
The stronger approach for a seller is to build a clean, well-documented add-back schedule from the start. Every add-back should be supported by a record, and questionable items should be left off entirely rather than defended weakly later. A seller who presents conservative, verifiable earnings earns credibility, moves faster through diligence, and is far more likely to reach the closing table at a price that holds. Presentation matters, and a business advisor can help a seller prepare financials that stand up to scrutiny instead of falling apart under it.
SDE sits at the intersection of accounting, tax, and negotiation, which is why buyers and sellers should not try to settle it alone. Your CPA should be involved in reviewing the financials and confirming which add-backs are appropriate given the tax treatment of the business, and your attorney should be involved when the way earnings are represented becomes part of the purchase agreement. Nothing in this article is legal or tax advice, and the specifics of any deal should be reviewed by your own professionals. What an experienced advisor adds is the transactional judgment to know which add-backs a bank and a buyer will accept, and how to structure the conversation so the number survives all the way to closing.
Seller's Discretionary Earnings is more than a valuation input. It is the foundation that the price, the financing, and the buyer's future income all rest on. When SDE is calculated honestly and documented carefully, the deal moves forward on solid ground and both parties can trust the outcome. When it is inflated, the damage surfaces later, usually during due diligence or loan underwriting, when it is hardest to fix. Getting this number right is the single most effective way to protect a transaction from the start, and it is the first thing we help our clients get right whether they are buying or selling.
To learn more about the author, Allura Engel, Associate Advisor at EDGE Business Advisors, and to view her full bio and services, click here.
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