What EBITDA Actually Means in a Dental Practice — and Why Your Tax Return Doesn't Show It

EBITDA. You'll see it in every DSO letter of intent. You'll hear it in every M&A conversation. And if you ask most practice owners what their EBITDA actually is, you'll get a shrug and a rough number that's almost certainly wrong.

That's not an insult — it's just the reality. EBITDA is a financial construct that dental school doesn't teach and that most accountants only explain in passing. But in a DSO transaction, it's the single most important number in the room. It determines your purchase price, your earn-out calculation, your rollover equity basis, and in many cases your employment compensation post-close.

Understanding it clearly is worth whatever time you put into it.

The basic definition

EBITDA stands for Earnings Before Interest, Taxes, Depreciation, and Amortization. It's designed to approximate the operating cash flow of a business by stripping out financing costs (interest), tax structure (which varies by entity type), and non-cash accounting entries (depreciation and amortization).

The goal is to produce a number that represents the business's earning power in a way that's comparable across different ownership structures and tax situations. If you own your practice as an S-corp and your colleague owns hers as a sole proprietorship, your reported net incomes aren't directly comparable. Your normalized EBITDAs should be — more or less.

Why your tax return understates it

Here's the part that catches most practice owners off-guard. Your tax return is optimized to minimize your taxable income. Your EBITDA calculation needs to accurately represent your practice's earning power. Those two goals are in direct tension.

A few common examples of items that are on your tax return but should be added back to calculate normalized EBITDA:

Owner compensation above market rate — if you're paying yourself $600K and a replacement dentist would cost $250K, the $350K difference is an add-back. Buyer's don't pay to fund above-market owner salaries in perpetuity.

Personal expenses run through the business — vehicle, travel, certain meals, insurance products paid through the entity. These are legitimate tax strategies and entirely defensible; they're also EBITDA add-backs.

One-time expenses — legal fees from a non-recurring dispute, build-out costs, major equipment replacement. Anything that won't recur under normal operations gets added back.

Rent above or below market — if you own your building and you're paying yourself below-market rent through the practice, the EBITDA calculation needs to normalize to market rates.

Add all of these back and you'll almost always arrive at a normalized EBITDA that's meaningfully higher than your bottom line on Schedule C or your S-corp K-1.

The multiple does the math

Once you have a clean normalized EBITDA, the valuation becomes a multiplication problem. At 6x EBITDA, a practice with $500K normalized earnings is worth $3M. At 7x, it's $3.5M. At 8x, it's $4M.

Which means a $100K change in your normalized EBITDA — from a missed add-back, from a misclassified expense, from owner comp that wasn't properly adjusted — doesn't just reduce your reported earnings by $100K. It reduces your valuation by $600K to $800K depending on the multiple. That's the math that makes this worth understanding precisely.

Calculating your own baseline

You don't need a banker to run a preliminary EBITDA calculation on your practice. The DSI EBITDA Normalizer walks you through every major add-back category with clear definitions of what qualifies and what doesn't. It's the same framework used in the Earn-Out Trap calculator suite — the tool used by dentists who are actively preparing for or evaluating DSO transactions.

Run it before any serious conversation with a buyer. Know your number independently before someone else hands you theirs.

FAQ

What's a good EBITDA for a dental practice? There's no universal benchmark — it varies significantly by practice size, market, and overhead structure. As a rough reference, a solo practice running efficiently might target 20–30% EBITDA margin on collections. Multi-location or group practices often run tighter margins at the unit level due to overhead structure.

Does EBITDA include doctor compensation? In a normalized EBITDA calculation, doctor compensation is replaced with a market-rate associate replacement cost. Any owner compensation above that market rate is added back.

How does EBITDA affect my earn-out after close? The DSO's post-close EBITDA calculation — how they define and measure it — directly determines your earn-out payments. This is one of the most negotiated provisions in any dental transaction. See The Earn-Out Trap for clause-by-clause guidance.

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