TL;DR: Most dental practices run on a rough 60/40 split: 60–65% of collections cover operating costs, leaving 35–40% as pre-tax profit before owner compensation is separated out. But “overhead” isn’t one number — it’s eight category lines that each behave differently and each have their own typical/good/great range. This breakdown walks category by category (staff, rent, lab, supplies, marketing, insurance write-offs, equipment/tech, owner-doctor comp), gives an 8-step process to audit your own numbers, and answers the 10 questions operators ask most about where the money actually goes.
The 60/40 Rule: Where Overhead Starts
The starting reference point for any dental office overhead breakdown is what practice consultants call the 60/40 rule: a well-run general practice spends roughly 60–65% of collections on operating costs and keeps 35–40% as pre-tax profit, before that profit is split into owner-doctor compensation and true practice profit. Practices running above 70% overhead are, by definition, giving up margin somewhere on the list below — the breakdown exists to show you exactly where. For the full 12-metric operator scorecard this breakdown feeds into, see our dental practice benchmark scorecard.
The 60/40 split is a starting reference, not a target to hit on every category individually — a practice can run high lab cost and low marketing cost and still land inside a healthy total-overhead band. What matters is the total, and knowing which categories are structurally fixed (rent, equipment financing) versus which are operator-controlled month to month (staff scheduling, supply ordering, marketing spend).
Category-by-Category Overhead Breakdown
Staff Compensation: 25–28% of Collections
Staff compensation — payroll, payroll taxes, and benefits for the clinical and administrative team, excluding owner-doctor pay — is the largest single overhead category in almost every general practice. Typical range is 25–28% of collections; well-run practices hold this at 22–25% without cutting hours that cap production capacity. This is the category most owners try to manage down first and the one where cutting too aggressively backfires fastest, since understaffing a hygiene department directly suppresses the reappointment and case-finding numbers that drive future production.
Rent/Facility: 5–7% of Collections
Facility cost — rent or mortgage, utilities, and facility maintenance — typically runs 5–7% of collections. This is one of the most fixed lines on the breakdown; it doesn’t flex with production the way staff or supply costs do, which means a practice with below-average production and a market-rate lease will show a facility-cost percentage well above the typical range even though the dollar amount is unremarkable. Facility cost as a percentage is one of the clearest early signals of a practice that needs to grow production rather than cut spending.
Lab Fees: 7–10% of Collections
Outside lab fees for crowns, dentures, and other prosthetic and restorative work typically run 7–10% of collections, with well-negotiated lab contracts bringing this to 5–7%. This category moves with case mix more than any other line — a restorative-heavy practice will structurally run higher than a hygiene-and-prevention-focused practice, so compare against your own trailing average rather than a flat industry number when auditing this line.
Supplies: 5–7% of Collections
Clinical and office supplies typically run 5–7% of collections. Of every category on this list, supply cost is the fastest to audit and the fastest to correct — group-purchasing organization contracts, inventory management discipline, and eliminating unused subscriptions typically recover 0.5–1.5 points within a single quarter without any change to clinical protocol.
Marketing: 2–5% of Collections
Marketing spend — paid advertising, SEO/content, review-platform fees, and referral programs — typically runs 2–5% of collections. This is the one category where “lower” isn’t automatically better: a practice actively growing new-patient volume should expect to run at the higher end of this range, and a practice at 1% marketing spend with a stagnant new-patient count is likely under-investing rather than efficiently managed.
Insurance Write-Offs: 25–35% of Gross Production (PPO Practices)
This is the largest overhead-adjacent line on the entire breakdown, and it doesn’t show up on a standard expense report the way staff or rent does — it’s a contractual adjustment against gross production, not a cash expense. For PPO-heavy practices, typical write-off levels run 25–35% of gross production. A practice negotiating stronger fee schedules or reducing PPO dependence can bring this to 15–25%; out-of-network and fee-for-service practices often run below 15%. Because this line is calculated against gross production rather than collections, it’s easy to underestimate its actual profitability impact — see our full PPO drop economics model for the net-revenue math.
Equipment/Technology: 2–4% of Collections
Equipment financing, technology subscriptions (PMS, imaging software, patient communication platforms), and maintenance contracts typically run 2–4% of collections. This category has grown over the past several years as PMS and imaging technology stacks have expanded — see our PMS comparison guide for how to evaluate whether your current software spend is proportionate to what it’s replacing in staff time.
Owner-Doctor Compensation: The Remainder
Owner-doctor compensation is what remains after the operating categories above are subtracted from collections — typically 30–40% of collections for a single-doctor general practice, though this figure blends true compensation for clinical production with practice profit and is often not cleanly separated on the P&L. A useful audit step: run doctor production at a fair-market associate compensation rate (typically 28–32% of personal production) and see what’s left as pure practice profit versus doctor labor. Practices that skip this separation frequently misjudge their actual practice profitability because doctor labor and practice profit are bundled into one number.
How to Audit Your Own Overhead
- Pull a trailing-12-month P&L. Use a full year rather than a single month or quarter so seasonal expense timing (annual software renewals, insurance premium payments) doesn’t distort any one category.
- Separate owner-doctor compensation from operating expenses. Most bookkeeping software lumps owner draws into payroll by default — pull owner comp out as its own line before calculating any category percentage.
- Categorize every expense into the eight buckets above. If your chart of accounts doesn’t map cleanly, this is the point to rebuild it — a clean chart of accounts makes every future audit faster.
- Divide each category by trailing-12-month collections. Not gross production — collections, since that’s the cash actually available to pay these expenses.
- Calculate the insurance write-off percentage against gross production separately. This is the one line that should be measured against production, not collections, since it’s a contractual adjustment rather than a cash outflow.
- Compare each category to the typical/good/great ranges above. Flag any category more than 3–5 points outside the typical range for deeper investigation.
- Investigate the flagged categories against volume, not just dollar amount. A high lab-cost percentage in a restorative-heavy practice may be appropriate case mix, not inefficiency — check the category against your production mix before assuming it needs correction.
- Re-run the audit quarterly. Overhead composition shifts gradually; a quarterly cadence catches drift before it compounds into a full-year problem.
The practices that get the most value from an overhead audit don’t try to cut every category simultaneously. They identify the one or two categories furthest outside the typical range, confirm whether the deviation is explained by case mix or facility constraints (structural, low-urgency to fix) or by process gaps (operator-controlled, high-urgency to fix), and address the process-gap categories first.
Frequently Asked Questions
Where does most of the money go in a dental practice?
Staff compensation is typically the largest single overhead category at 25–28% of collections, followed by insurance write-offs (25–35% of gross production for PPO-heavy practices, though this is a contractual adjustment rather than a cash expense), lab fees (7–10%), rent (5–7%), and supplies (5–7%).
What is the 60/40 rule for dental practice overhead?
The 60/40 rule is a reference benchmark stating that a well-run general dental practice spends roughly 60–65% of collections on operating costs, leaving 35–40% as pre-tax profit before that remainder is split between owner-doctor compensation and true practice profit.
What percentage of collections should go to staff?
Typical staff cost (payroll, taxes, and benefits, excluding owner-doctor compensation) runs 25–28% of collections. Well-run practices hold this at 22–25%, but cutting staff cost below what production capacity requires is a common overcorrection that suppresses future production.
How much should a dental practice spend on marketing?
Typical marketing spend runs 2–5% of collections. Practices actively growing new-patient volume should expect to run at the higher end of this range; a practice significantly below 2% with flat new-patient counts is likely under-investing in growth rather than running efficiently.
Why are insurance write-offs the biggest hidden overhead line?
Insurance write-offs don’t appear as a cash expense on a standard P&L the way rent or payroll does — they’re a contractual reduction against gross production. For PPO-heavy practices this typically runs 25–35% of gross production, which is often larger in dollar terms than any single expense category, making it easy for owners to underestimate its impact on practice profitability.
What is a typical lab cost percentage for a general dental practice?
Typical lab cost runs 7–10% of collections, with negotiated lab contracts bringing well-run practices to 5–7%. This category moves substantially with case mix — restorative-heavy practices run structurally higher than prevention-focused practices.
How is owner-doctor compensation different from practice profit?
Owner-doctor compensation typically blends fair-market pay for the doctor’s own clinical production with the practice’s true operating profit, and most P&Ls don’t separate the two. A useful audit step is running the doctor’s own production at a fair-market associate rate (typically 28–32% of personal production) to see what remains as pure practice profit versus doctor labor.
What’s a healthy equipment and technology spend?
Equipment financing, technology subscriptions, and maintenance contracts typically run 2–4% of collections. This category has trended upward as PMS, imaging, and patient-communication technology stacks have expanded across the industry.
How often should I audit my overhead breakdown?
Run the full 8-category overhead audit quarterly using trailing-12-month data. Overhead composition shifts gradually rather than suddenly, so a quarterly cadence is frequent enough to catch drift before it compounds into a larger year-end problem.
Do these overhead ranges apply to every practice size?
These ranges are calibrated to a typical single- or two-doctor general practice. Larger multi-doctor practices and DSO-affiliated locations often see lower staff-cost and facility-cost percentages due to shared overhead across more production, while very small or newly opened practices often run structurally higher percentages until production volume catches up to fixed costs.
Related Resources
- Dental Practice Growth: Proven Strategies for 2026 — the original overhead-benchmarks guide this breakdown expands on.
- Dental Practice Benchmark Scorecard (2026) — the full 12-metric operator dashboard, including overhead as one of twelve tracked lines.
- PPO Drop Economics (2026) — the deep-dive on the largest single overhead-adjacent line: insurance write-offs.
