SDE: The Valuation Metric That Drives Small Business Prices
Seller's Discretionary Earnings (SDE) is the total economic benefit an owner-operator receives from a business in a given year. It's the primary valuation metric for small business acquisitions — the number that gets multiplied by an industry multiple to produce the asking price.
If a business sells for "3× SDE" and SDE is $200,000, the purchase price is $600,000. Understanding SDE — and verifying it — is the most important financial skill in small business acquisitions.
The SDE Formula
SDE = Net Income + Owner Salary & Benefits + Depreciation & Amortization + Non-Recurring Expenses + Personal Expenses Run Through the Business
This is the output of the financial recasting process. Each line represents a category of add-back.
SDE vs. EBITDA
The critical difference: SDE adds back the owner's entire compensation (salary + benefits + any other personal economic benefit), treating the business as if one person captures all the economic value. EBITDA, by contrast, subtracts a market-rate management salary — it assumes a hired professional runs the business.
This matters because SDE is the right metric when the buyer plans to work in the business as an owner-operator (capturing all earnings). EBITDA is right when the buyer plans to hire a manager (one layer of earnings goes to that manager's salary before the buyer sees returns).
| Metric | Who it's for | Typical multiple |
|---|---|---|
| SDE | Owner-operators; businesses under ~$2M earnings | 2× – 4.5× |
| EBITDA | Platform acquisitions; PE; management-run businesses | 4× – 10×+ |
What a Good SDE Number Looks Like
SDE multiples are driven by business quality, not just industry. Within any sector, businesses at the high end of the multiple range typically have:
- Multiple years of stable or growing SDE (not a single good year)
- Diversified customer base (no customer concentration)
- Documented processes and a team that runs without the owner daily
- Transferable contracts and relationships (low key man risk)
- Clean, auditable financials that reconcile to tax returns
Trailing 12 Months vs. Average
SDE is usually calculated based on the trailing 12 months (TTM) — the most recent year of operation. For businesses with recent growth, sellers prefer TTM (higher). For businesses with a recent dip, sellers may push for a 3-year average (smoother). Buyers should understand which basis is being used and model both. For cyclical businesses, a 3-year average is more reliable; for businesses with clear and sustainable revenue growth, TTM may be appropriate.
Common SDE Mistakes
- Adding back recurring expenses as "one-time" — marketing spend, equipment maintenance, and professional fees that recur annually aren't add-backs
- Adding back a replacement role — if the owner does sales and a new owner would need to hire a salesperson, that salary can't be fully added back
- Not verifying against bank statements — SDE built from P&L alone can be inflated; deposits don't lie
Deal-Model Context
SDE is the core earnings metric for many owner-operated small businesses because it shows the cash flow available to one working owner before the buyer decides how to pay themselves. It is powerful, but it is also easy to inflate.
In the model, calculate SDE only after reviewing net income, owner compensation, add-backs, non-recurring costs, and replacement labor. If the buyer will not personally operate the business, a market manager salary should usually be deducted before valuation.
Buyer Diligence Questions
A strong SDE file reconciles to tax returns and bank activity. It also separates normal business expenses from true owner discretion. If the seller's SDE depends on vague personal expenses or recurring one-time costs, use a lower base case.
This term connects to add-backs, recasting, EBITDA, valuation multiples, and SBA underwriting. Ask which add-backs are documented, which owner roles must be replaced, and whether the same SDE supports debt service after closing.
Practical Review Checklist
Before relying on SDE: The Valuation Metric That Drives Small Business Prices in an acquisition model, turn the term into a written assumption. State what source document proves it, what dollar amount or risk category it changes, and whether it affects purchase price, cash at closing, debt service, working capital, legal exposure, or post-close operations. That step makes the concept auditable instead of merely descriptive.
For buyer diligence, collect at least one primary source document, one seller explanation, and one downside case. If the source document is missing, keep the assumption out of the base case. If the downside case changes DSCR, working capital, customer retention, or transition risk enough to threaten closing, address it through price, seller financing, escrow, earnout, indemnity, or a closing condition.
When using AcquireCalc, enter the verified number first, then test the seller's number and a conservative number. The spread between those cases shows whether SDE: The Valuation Metric That Drives Small Business Prices is a minor definition, a negotiation point, or a risk that should change the structure of the deal.
Related Terms
- Add-backs — the individual adjustments that build up SDE
- Recasting financial statements — the process that produces SDE
- Enterprise value — how SDE multiples relate to total deal value
Sources & Further Reading
- IBBA Market Pulse — quarterly data on SDE multiples by industry and deal size
- BizBuySell Insight Report — transaction data on how SDE translates to purchase price in real deals