If you're looking at small businesses to buy, one abbreviation decides more than any other: SDE. Listings call it "cash flow," brokers price off it, and every add-back argument you'll ever have with a seller is really an argument about it. Here's what SDE actually is, in plain English.
The short answer: Seller's Discretionary Earnings (SDE) is the total financial benefit one working owner gets from a business in a year. It starts with pre-tax profit, then adds back the owner's salary, the owner's personal perks run through the business, interest, depreciation, and genuinely one-time expenses. It's the number that answers: if I owned this and worked in it, what would it really pay me?
The SDE formula, step by step
Start with the business's pre-tax net income (from the tax return, not the listing), then add back:
- The current owner's salary and payroll taxes. You're replacing them, so their pay is part of what the business yields to an owner.
- Owner perks. The truck, the phone, the health insurance, the "board meeting" in Scottsdale — personal expenses run through the business.
- Interest. The seller's debt won't be your debt; your financing will be different.
- Depreciation and amortization. Paper expenses, not cash out the door — with a caveat below.
- True one-time expenses. The lawsuit settled last year, the flood repair. One-time is the most abused phrase in small-business sales; anything that appears in two different years isn't.
Example. A plumbing company shows $110,000 of net income on its tax return. The owner pays herself $85,000 plus $8,000 of payroll tax, runs a $12,000 truck and $6,000 of insurance through the books, paid $9,000 of interest, and took $25,000 of depreciation. SDE = 110 + 85 + 8 + 12 + 6 + 9 + 25 = $255,000. That's the number a multiple gets applied to when valuing the business.
What does NOT belong in SDE
- A second working family member's pay — if the spouse runs the office full-time unpaid, you'll have to pay someone to do that. Honest sellers subtract that.
- Recurring "one-time" costs — equipment repairs happen every year in a trade business. So does hiring.
- Rent you won't actually get — if the seller owns the building and charges the business below-market rent, your rent will be higher. Adjust down.
- Depreciation on equipment you'll immediately replace — if the trucks are dead, that "paper expense" is about to become a very real one.
This is why add-backs deserve their own scrutiny (see how to tell legit from inflated): each padded dollar gets multiplied by the pricing multiple. A seller who inflates SDE by $40,000 just raised the asking price by $120,000–$160,000 with a spreadsheet.
SDE vs. EBITDA: which one applies to your deal?
They differ by exactly one thing that matters: the owner's pay. EBITDA treats management as a cost that stays; SDE assumes the owner-operator IS management and adds their pay back. If you're buying a business to run yourself, SDE is your number. If you're buying one with a manager in place who stays, EBITDA (with a real market salary in the expenses) is closer to the truth. Mixing them up misprices a deal by one full salary — multiplied.
How to verify a seller's SDE
Don't argue with the listing; rebuild the number. Get three years of tax returns and P&Ls, line them up side by side (see how to read a small business's financials), and construct SDE yourself from the tax returns. Every add-back should be traceable to a line you can point at, and anything labeled one-time should be absent from the other years. If the seller's SDE and yours differ, the gap is your negotiation agenda — and if the seller says the tax returns understate the "real" cash flow, the tax returns are still the number a lender will lend against.
That last point is worth sitting with: your lender will size the loan on documented cash flow. SDE built on undocumented add-backs isn't just optimistic — it's unfinanceable. Once you have a number you trust, the free deal calculator shows what it supports at lender terms.
Free help for this part: the due-diligence checklist and 40 seller questions, written for exactly this conversation.
Get the free guidesFAQ
Is SDE the same as "cash flow" in a listing?
Usually that's what the broker means, but verify — some listings quote revenue, EBITDA, or a projection. Ask which, and ask for the math.
What's a typical SDE multiple?
As a screening rule of thumb, owner-operated Main Street businesses tend to trade around 3x–4x SDE, with businesses that truly run without the owner justifying more. The full walkthrough is in our valuation guide.
Does SDE include the owner's spouse working for free?
It shouldn't. Unpaid family labor is a hidden cost — you'll pay a real person for that work. Subtract a market wage for it.
Can SDE be negative even when the listing shows profit?
Yes — if the "profit" depends on add-backs that aren't real, or the owner was underpaying themselves for years. Rebuilding the number from tax returns is how you find out.
Scope reads a listing or a P&L, proposes the SDE build-up with every add-back traced to its source, and runs the lender math on the result — so you see what the number really is before you negotiate on it.
Scope your first deal freeEducational content, not financial, legal, or tax advice for your situation — confirm specifics with your own CPA and attorney.