Most ecommerce founders who receive a valuation offer are surprised by the number — not because the market is wrong, but because they calculated their own SDE incorrectly. Some overstate it by adding back expenses that do not qualify. Others understate it by missing legitimate addbacks entirely. Either way, they walk into the most important financial conversation of their business life without the right number.
SDE, or Seller’s Discretionary Earnings, is the metric buyers use to value owner-operated ecommerce businesses in the $500K to $10M profit range. Understanding how to calculate it correctly, which expenses legitimately get added back and which do not, and how buyers will verify your figure during diligence is foundational knowledge for any founder thinking about an exit.
This guide walks through the full SDE calculation from gross revenue to final number, with a real worked example and the most common mistakes founders make along the way.
What SDE Is and Why Buyers Use It
SDE stands for Seller’s Discretionary Earnings. It is the total financial benefit that a single full-time owner-operator derives from the business in a given year. It captures not just the profit the business generates, but also the compensation and personal benefits the owner extracts that would not appear in a standard EBITDA calculation.
Buyers use SDE for owner-operated businesses because it answers the most relevant question: if I buy this business and run it myself, how much money will I make? That is a different question from “how profitable is this business on paper,” which is what EBITDA answers for institutional-quality, management-run companies.
SDE vs EBITDA: EBITDA (Earnings Before Interest, Taxes, Depreciation, and Amortization) is used for larger businesses, typically above $5M in annual profit, where the owner is not the primary operator and the company has a management team in place. For most DTC and FBA businesses in the $1M to $5M profit range, SDE is the correct metric. Buyers who try to apply EBITDA multiples to SDE businesses, or vice versa, will consistently misprice the deal.
For the full picture on how SDE multiples translate to deal values in 2026, see Ecommerce Multiples in 2026: Real Deal Data from EcomSwap.
The SDE Formula: Step by Step
The SDE calculation starts with gross revenue and works down to a normalized earnings figure. Here is the full formula:
| Gross Revenue minus Cost of Goods Sold (COGS) = Gross Profit minus Operating Expenses (excluding owner comp) = Operating Profit plus Owner Salary and Benefits plus Legitimate Addbacks = SDE (Seller’s Discretionary Earnings) |
Let’s break down each line.
Gross Revenue
This is total revenue before any deductions. For Shopify businesses, this means gross sales minus returns and refunds, which gives you net revenue. For Amazon FBA, it means total revenue after Amazon fees (which are an operating cost, not a revenue deduction) but before COGS.
A critical note: buyers will reconcile your stated revenue against Shopify reports, Seller Central data, and bank deposits. If those three numbers do not match within a reasonable variance, it creates an immediate red flag in diligence. Documenting the reconciliation before going to market is time well spent.
Cost of Goods Sold (COGS)
COGS includes the direct cost of producing or purchasing the products you sell: manufacturing cost or wholesale purchase price, inbound freight and shipping to your warehouse or Amazon FBA, and packaging materials. It does not include outbound shipping to customers (that is an operating expense), marketing costs, or platform fees.
Clean, accurate COGS accounting is one of the things buyers scrutinize most carefully. Founders who bundle COGS and operating expenses together, or who have inconsistent inventory accounting, will face hard questions in diligence that create uncertainty and compress offers.
Operating Expenses
Operating expenses are everything it costs to run the business that is not COGS. This includes:
- Platform fees (Shopify subscription, Amazon referral fees, payment processing)
- Paid advertising spend (Meta, Google, Amazon PPC)
- Software and tools (Klaviyo, Triple Whale, Gorgias, Recharge)
- Fulfillment and 3PL costs (if not included in COGS)
- Contractor and freelancer costs
- Customer service costs
- Accounting, legal, and professional fees
When calculating SDE, you exclude owner compensation from operating expenses and add it back separately. All other operating expenses remain in the calculation.
Owner Salary and Benefits
This is the total compensation the owner takes from the business: salary, distributions, health insurance paid by the business, vehicle expenses run through the business, and any other personal benefit the owner receives. The full amount is added back to arrive at SDE because the buyer is assessing what they would earn, not what the seller paid themselves.
If the business has a co-founder or a working partner who also draws compensation, only one owner’s compensation is typically added back in a standard SDE calculation, unless the deal specifically accounts for the second person.
Addbacks: What Qualifies and What Does Not
Addbacks are the expenses you add back to operating profit because they are either personal, one-time, or not representative of the ongoing economics of the business. This is where most SDE calculations go wrong, both through over-claiming and under-claiming.
Legitimate Addbacks
- Owner salary, bonus, and distributions (the full amount drawn from the business)
- Owner health insurance, life insurance, or other personal benefits paid by the business
- Personal vehicle expenses run through the business
- Personal travel or meals with no legitimate business purpose
- One-time legal or accounting fees not expected to recur
- Depreciation and amortization (non-cash charges)
- One-time software implementation or migration costs
- Non-recurring marketing campaigns or launch costs
- Charitable donations made through the business
- Interest expense on business debt (if applicable)
Every addback must be documented. “I can explain it” is not the same as “here is the invoice and the bank record.” Buyers will ask for receipts, payroll records, or statements for every addback line. Prepare these before you go to market, not during diligence.
What Does NOT Qualify as an Addback
This is where inflated SDE numbers collapse in diligence. The following are commonly claimed as addbacks but will not hold up under buyer scrutiny:
- Below-market salaries paid to employees who do real work — if you are paying a marketing manager $40K to do a $80K job, the buyer will normalize that cost to market rate, which reduces your SDE
- Ongoing software costs the buyer will need to continue — your Klaviyo subscription is not a one-time cost
- Inventory write-offs resulting from purchasing decisions the buyer will also face
- Expenses you intend to continue after the sale — if you are adding back a trade show expense but the buyer plans to attend the same shows, it stays in
- Salaries for family members who will not transition with the business — if your spouse does real work in the business at a below-market rate, that labor cost will need to be replaced and buyers will add it back as a cost, not remove it
Over-claiming addbacks is one of the fastest ways to destroy trust with a buyer. When a buyer’s advisor finds an addback that does not hold up, they will question every other line in your SDE bridge. A clean, conservative SDE number that survives diligence is worth far more than an inflated figure that gets renegotiated at close.
A Worked Example: From Revenue to SDE
Here is how the SDE calculation works for a real DTC supplement brand doing $4.2M in gross revenue:
| Gross Revenue: $4,200,000 minus Returns and Refunds: ($168,000) = Net Revenue: $4,032,000 minus COGS (38%): ($1,532,160) = Gross Profit: $2,499,840 minus Operating Expenses: ($1,180,000) = Operating Profit: $1,319,840 plus Owner Salary and Benefits: $220,000 plus Legitimate Addbacks: $95,000 = SDE: $1,634,840 |
At a 4.2x multiple, this business would be valued at approximately $6.86M. The addbacks in this example include: $220K owner salary and health insurance, $45K in depreciation on owned equipment, $28K in one-time legal fees from a supplier dispute, and $22K in personal vehicle expenses run through the business.
Notice that the SDE of $1.63M is meaningfully higher than the operating profit of $1.32M. That $313K difference represents the addbacks. In a deal context, that difference is worth $1.3M in deal value at a 4.2x multiple. This is why getting addbacks right matters.
For a deeper look at how to identify and document each addback category, see the full guide: What Is EBITDA Addback and Which Expenses Should You Add Back Before Selling.
The 4 Most Common SDE Calculation Mistakes
1. Using gross revenue instead of net revenue. Including returns and refunds in your revenue overstates your top line and will immediately raise a red flag when buyers reconcile against platform data. Always calculate SDE from net revenue.
2. Inconsistent treatment of COGS across periods. If your COGS methodology changes between years, year-over-year margin comparisons become meaningless. Buyers will notice. Keep COGS definitions consistent across all periods you present.
3. Not normalizing for one-time revenue spikes. If you had an exceptional quarter from a viral moment, a PR hit, or a one-time wholesale order, buyers will normalize that out of your T12M. Do not build your valuation expectation around a number that includes non-recurring revenue. Present a normalized figure proactively rather than having the buyer discover the spike in diligence.
4. Claiming addbacks without documentation. As covered above, every addback must be supported by a record. Prepare a clean SDE bridge document that shows each addback line, the amount, and the supporting documentation reference. This alone can meaningfully accelerate diligence and protect your multiple.
What to Do with Your SDE Number
Once you have a clean, documented SDE figure, the next question is what it is worth in the current market.
The answer depends on seven factors beyond SDE itself: your revenue trend, your margins, owner dependency, channel concentration, customer LTV, IP, and financial documentation quality. Two businesses with the same SDE can trade at multiples that differ by 2x or more based on these factors.
For the full breakdown of how each factor moves your multiple, read DTC Brand Valuation: The 7 Factors That Move Your Multiple Up or Down. And for where current market multiples sit across DTC, FBA, and subscription businesses, see Ecommerce Multiples in 2026: Real Deal Data from EcomSwap.
The most useful thing you can do with your SDE number right now is run it through EcomSwap’s free valuation tool. It takes your SDE, applies the seven factors, and gives you a specific multiple estimate anchored to real 2026 deal data. In five minutes, you will know what your business is worth today and what the highest-impact improvements are before going to market.
