SDE is the most important number in any online business acquisition — yet most first-time buyers have never heard of it until they're already in a deal. Here's exactly what it is and how to use it.
If you're evaluating an online business and you don't understand SDE, you don't actually understand what you're buying. Period. Every listed price on Empire Flippers, Flippa, Acquire, and Motion Invest is derived from SDE. Every multiple buyers and sellers negotiate is applied to SDE. It is the single most important number in any small business acquisition.
And yet most first-time buyers don't encounter this term until they're already deep in a deal, squinting at a spreadsheet they half-understand. This post fixes that.
Seller's Discretionary Earnings (SDE) is the total economic benefit a single owner-operator receives from a business per year. It captures not just what the business reports as profit, but everything the owner extracts — salary, personal benefits, personal expenses run through the business, and non-cash charges like depreciation. Then it removes any one-time windfalls that won't repeat.
The goal of SDE is normalization. Two identical businesses can show wildly different "net profits" depending on how the seller structures their compensation. One owner pays themselves $120K/year in salary and the P&L shows $40K net profit. Another owner pays themselves nothing, takes distributions, and the P&L shows $160K net profit. But both businesses generate the exact same economic value. SDE makes them comparable.
This normalization is what allows buyers to use a consistent multiple to price deals — regardless of how the current owner happens to structure their finances.
The formula has five components. Each add-back has a reason behind it:
Let's walk through why each line works the way it does.
This is the bottom line from the seller's P&L statement — revenue minus all operating expenses, including the owner's salary if it's on the books. It's the starting point, not the answer. On its own, net profit understates the true value of a small owner-operated business because it includes the owner's compensation as a cost.
The seller pays themselves $60K/year. That salary is recorded as an expense, reducing net profit by $60K. But you — the buyer — will either pay yourself differently, hire someone to replace the owner at a different salary, or run the business yourself without taking a salary. Either way, this cost gets added back and repriced according to your actual plan. You can always subtract a "market rate manager salary" later during your personal return-on-investment analysis, but for valuation purposes, it goes back in.
The business pays the owner's health insurance premium — $700/month. This is a personal benefit to the owner, not a business operating cost that a buyer would necessarily incur. It gets added back. Same logic applies to other owner perks paid by the business: life insurance, disability insurance, phone bills, travel that's personal in nature.
The car lease is a common one. The seller runs a car lease through the business at $600/month. Maybe it's partially business use, but it's primarily personal transportation. A new owner wouldn't have this cost unless they chose to. It goes back in. Watch for gym memberships, home office furniture, personal travel, meals and entertainment that look personal — all potentially addable.
The seller paid a $4,500 legal fee to register a trademark this year. That's not a recurring cost — it won't appear again next year or the year after. Including it would understate the business's sustainable earnings. So it gets added back. Other examples: one-time consulting fees, a website redesign, equipment purchases that won't recur, settlement costs.
Depreciation is a real accounting charge but not a real cash outflow in the year it's recorded. For small online businesses — which rarely have significant physical assets depreciating — this add-back is usually small, but it's included for completeness.
This one runs in reverse. The seller had a product go viral last year — a spike that added $25K in revenue that won't repeat. Including it would overstate what the business sustainably generates. So it gets subtracted. This is where sellers can game the numbers — and where buyers need to be careful. Any revenue that came from an extraordinary event, a one-time partnership, or a seasonal spike that won't recur should be examined.
EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) is the metric used for larger business acquisitions — typically those with management teams and revenues above $2-3 million. EBITDA explicitly does NOT add back owner compensation, because larger businesses are expected to have professional management teams in place that will continue to run the company. The owner isn't the operator.
SDE assumes the opposite: that a single owner-operator is running the business, and the buyer will either operate it themselves or find a replacement. This makes SDE more appropriate for the $100K–$5M online business market where most deals happen.
Rule of thumb: If the business is owner-operated and the current owner is doing meaningful work in the business, use SDE. If the business has a management team and the owner is truly passive, use EBITDA. Almost all online businesses under $3M purchase price use SDE.
New buyers often anchor on net profit because it's the number they're most familiar with. But as the example above shows, a business generating $180K in net profit can have an SDE of $238K — a 32% higher number that's used to set the asking price.
If you evaluate a business based on net profit alone, you'll consistently think deals are overpriced relative to what they're actually worth. A seller listing at 3x SDE is not listing at 3x net profit — and those two numbers can be dramatically different.
| Business Type | Typical SDE Multiple | Notes |
|---|---|---|
| Amazon FBA Brand | 2.5x – 4x | Higher for established brands with strong reviews |
| Content Site | 2x – 3.5x | Lower for Google-dependent traffic; higher for diversified |
| SaaS | 3x – 5x | Premium for MRR, low churn, documented code |
| eCommerce DTC | 2x – 3.5x | Higher for owned email list and repeat customers |
| Digital Agency | 1.5x – 3x | Lower due to key-person risk and client concentration |
| Newsletter | 2x – 4x | Higher for large engaged lists with predictable sponsorship |
These are annual SDE multiples. A business generating $100K SDE at a 3x multiple lists at $300K. The multiple reflects risk: businesses with predictable, recurring revenue from multiple sources command higher multiples. Businesses dependent on a single traffic source, a single customer, or the current owner's personal relationships trade at lower multiples.
Sellers have every incentive to maximize the SDE they present. Most sellers are honest. Some are not. And even honest sellers can make mistakes. Here's what to watch for:
A seller adding back $24,000 in "owner salary" when the business requires 40 hours per week of skilled work is technically accurate but misleading — you'd have to pay someone $50K–$80K/year to replace that labor. The add-back is real, but your post-acquisition analysis needs to account for the replacement cost of that labor.
Watch for sellers who exclude software subscriptions, contractor costs, or platform fees by calling them "one-time" when they're actually recurring. If a business pays a contractor $2,000/month to write content and the seller calls it "one-time consulting," that's a red flag. Ask for a full 24-month expense history.
When a seller runs personal transactions through the business bank account, their bookkeeping is messy and their SDE calculation is unreliable. Either direction is a problem: personal expenses they've legitimately added back may not be real business costs, or business expenses they haven't tracked may be missing from the P&L entirely.
Ask the seller to specifically itemize any revenue they haven't subtracted from SDE that was above the business's typical monthly run rate. Then ask why they haven't subtracted it. The answer will tell you a lot about how the seller thinks about the business.
SDE presented in a listing is always the seller's version of the story. Here's how to check it independently:
The verification rule: If a seller provides numbers only in spreadsheet or PDF form, that's a starting point — not verified data. Direct platform access is the standard for serious due diligence.
Once you've verified and adjusted the SDE, pricing is relatively mechanical. Take the trailing twelve months (TTM) SDE. Pick a multiple that reflects the business's risk profile — higher for stable recurring revenue, lower for concentrated or declining businesses. Multiply. That's your starting point.
A business with $200K TTM SDE in a stable niche with diversified traffic and a 4-year track record might fairly trade at 3x = $600K. The same business with 90% of revenue from one Google keyword might justify only 2x = $400K, even if the SDE number is identical.
Want to run the math on your own deal? Use our business valuation calculator to stress-test different SDE scenarios and multiples before making an offer.
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SDE is the language of online business acquisitions. Once you understand it, you'll be able to read any listing intelligently, spot inflated add-backs immediately, and calculate a fair offer price in minutes.
The formula isn't complicated. The verification is where real skill — and protection — comes in. Get access to primary sources, reconcile the numbers independently, and treat any seller who resists that process as a serious red flag.
Every marketplace listing you'll evaluate on Empire Flippers, Flippa, Acquire.com, or Motion Invest leads with an SDE multiple. Now you know exactly what that number means.