If you're looking at small businesses to buy, the abbreviation that matters most is SDE. Listings call it "cash flow," brokers price off it, and every add-back argument you'll ever have with a seller is an argument about it. Here's what SDE is, in plain English.
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 and personal perks run through the business, interest, depreciation, and true one-time expenses. It answers one question: if I owned this and worked in it, what would it pay me?
The SDE formula, step by step
Start with the business's pre-tax net income (from the tax return rather than 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. These are personal expenses run through the business, like the truck, the phone, the health insurance, and the "board meeting" in Scottsdale.
- Interest. The seller's debt won't be your debt. Your financing will be different.
- Depreciation and amortization. These are paper expenses that don't take cash out the door (see the caveat below).
- True one-time expenses. The lawsuit settled last year and the flood repair both count. One-time is the most abused phrase in small-business sales. Anything that appears in two different years isn't one-time.
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, and so does hiring.
- Rent you won't get. If the seller owns the building and charges the business below-market rent, your rent will be higher. Adjust SDE down for it.
- Depreciation on equipment you'll immediately replace. If the trucks are dead, that "paper expense" will soon be cash out the door.
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 has raised the asking price by $120,000 to $160,000 with a spreadsheet.
SDE vs. EBITDA: which one applies to your deal?
The one difference that matters is the owner's pay. EBITDA treats management as a cost that stays, while SDE assumes the owner-operator is the 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 times the multiple. For the worked example and the lender's-eye view of the difference, see SDE vs EBITDA: which one matters when you're buying.
How to verify a seller's SDE
Rebuild the number instead of arguing with the listing. 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 what you negotiate over. 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 matters because your lender will size the loan on documented cash flow. SDE built on undocumented add-backs is optimistic, and a lender won't finance it. Once you have a number you trust, the free deal calculator shows what it supports at lender terms.
Want free help with this part? The due-diligence checklist and 40 seller questions are written for 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 it. Some listings quote revenue, EBITDA, or a projection instead. Ask which one it is, 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 to 4x SDE, and businesses that run without the owner justify more. The full walkthrough is in our valuation guide, and survey data on multiples by deal size is in what's a fair multiple for a small business.
Does SDE include the owner's spouse working for free?
It shouldn't. Unpaid family labor is a hidden cost, because you'll have to 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 if 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 the real number 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.