What Is a DSO Earn-Out — And Why Most Dentists Don't Understand What They're Signing

The letter of intent arrived on a Thursday. It looked good — 7x EBITDA, a two-year earn-out with solid upside, rollover equity with a projected second-bite return. The dentist called his accountant, who said the number looked reasonable. He signed the LOI the following week.

Eighteen months later, he'd collected about forty cents on every dollar of earn-out he'd been promised. The DSO had allocated corporate overhead to his practice P&L. His adjusted EBITDA — the number that determined his earn-out payment — had been quietly eroded from the inside. Nothing illegal. All of it buried in language he'd signed.

This happens more than the industry wants to admit.

So — what exactly is a DSO earn-out? And why does the answer matter so much more than most dentists realize before they're already in one?

The basic structure

An earn-out is a deferred payment mechanism. In a DSO transaction, the buyer (the DSO) pays you a portion of the purchase price at close, and the remaining portion — the earn-out — gets paid over a defined period based on your practice's financial performance after the acquisition. Typically one to three years. Typically tied to EBITDA or revenue targets.

On paper, it sounds fair. You get a big check at close, and then you get paid for performance you've already demonstrated you can deliver. The DSO gets some protection if the practice declines post-acquisition. Seems reasonable.

The problem is the details. And in DSO transactions, the details are where the money lives.

The four provisions that determine what you actually collect

Most earn-out disputes — and there are a lot of them — trace back to four specific provisions in the deal documents.

The first is EBITDA definition. This is the big one. The DSO's version of your EBITDA after close almost certainly looks different from your version before close. Management fees, allocated overhead, inter-company charges — these items can reduce your reported EBITDA by 15 to 40 percent depending on the group. If the earn-out is based on EBITDA and you haven't negotiated how EBITDA gets calculated, you've handed the other side a significant tool.

The second is the trigger structure. Not all earn-outs are binary. Some have tiers — you collect partial payment if you hit 80 percent of the target, full payment at 100 percent, and a bonus at 120 percent. Others are binary: you either hit the number or you don't. The difference between those two structures, over a two-year earn-out, can easily be six figures.

The third is the management covenant. This is the clause that's supposed to protect you — it restricts the DSO's ability to make material changes to your practice during the earn-out period without your consent. Patient volume, staffing levels, fee schedules. If this clause is weak or absent, the DSO can make operational decisions that make your earn-out harder to hit. Sometimes that's strategic. Sometimes it isn't. Either way, it's your money on the line.

The fourth is the accounting methodology provision. Which accounting standards govern the calculation? Who audits it? What's the dispute resolution process if you disagree with a payment figure? Most dentists don't realize they can negotiate an independent audit right until they're already in a dispute and wishing they had one.

The number that doesn't get talked about enough

I've spent twenty-five years in and around the dental industry. In that time I've talked to a lot of dentists who've been through DSO transactions. The ones who walked away feeling good about their earn-out almost universally had one thing in common: they had the deal documents reviewed by a dental-specific M&A attorney before they signed — not a general corporate attorney, not their estate planning lawyer. Someone who looks at these agreements for a living.

The ones who felt burned almost universally skipped that step, or hired general counsel who didn't know what to look for.

That's not a knock on dentists. Dental school doesn't teach contract negotiation. And most dentists encounter maybe one or two of these transactions in a career. The DSO's deal team has done hundreds.

What you can do right now

If you're evaluating a DSO offer — or if you're even thinking about a transaction in the next two to five years — the time to learn this material is before you have an LOI in front of you. Not after.

Start by understanding your own EBITDA baseline: the clean, normalized number that reflects your practice's actual earnings independent of owner-specific expenses. That's the number everything else gets calculated from. You can run your own EBITDA normalization using the DSI EBITDA Normalizer Calculator — it walks you through every major add-back category and shows you where your number should land.

Then read the deal. All of it. If the language is dense, that's intentional — DSO deal documents are written by lawyers who do this professionally. The Earn-Out Trap was written specifically to decode that language for dentists — clause by clause, provision by provision, in plain English.

And if you want to understand what your equipment and practice assets are worth as part of a pre-transaction valuation, DentalAssetIQ gives you a data-driven starting point on the equipment side.

You only sell your practice once. The information gap between what the DSO's team knows and what most dentists know at the time of signing is real. Closing that gap is worth every hour you put into it.