What tax strategies apply to a dental practice?

A dental practice's largest tax levers are usually an entity and compensation structure revisited after the income has grown, a defined benefit or cash balance plan stacked on a 401(k) at dentist income levels, equipment purchases — chairs, imaging, CAD/CAM — timed to the tax year, and holding the practice real estate in a separate entity. Associate-dentist classification and owner reasonable compensation are the two examination issues specific to dentistry.

Key points

A dental practice's largest recurring tax decision is usually whether it should be taxed as an S-corporation with a documented reasonable-compensation split between salary and distributions.
At established-dentist income levels, a defined benefit or cash balance plan stacked on a 401(k) with profit sharing permits far larger deductible contributions than a 401(k) alone.
Dental equipment such as operatory chairs, digital imaging, and CAD/CAM milling is deducted in the year it is placed in service when the expensing election is made.
A dentist who owns the practice building should hold it in a separate entity and lease it to the practice under a written, market-rate lease.
Associate-dentist classification and owner reasonable compensation are the two examination issues specific to dentistry.

Which entity and compensation structure fits a mature dental practice?

Many dental practices are organised in a way that fit the early years and quietly stopped fitting once income grew. Revisiting whether the practice should be taxed as an S-corporation, elected on Form 2553, and setting a reasonable-compensation split between W-2 salary and distributions is usually the largest recurring decision. The split reduces the wages subject to Social Security and Medicare tax, which is exactly why it has to rest on a defensible salary.

Owner compensation is one of the two issues most likely to draw attention in a dental examination. A salary study that compares the owner's pay to what an employed dentist in the same market earns, prepared before the year is filed, is what protects the position.

How do retirement plans work at dentist income levels?

Dentistry is a field where retirement plan design pays off unusually well. At the income levels established dentists reach, a defined benefit or cash balance plan can permit far larger deductible contributions than a 401(k) alone, and the two are frequently stacked: the 401(k) with profit sharing underneath, the cash balance plan above it.

Because the allowable contribution rises with the owner's age relative to the staff, an older owner-dentist with a younger team can move a substantial amount into tax-deferred savings each year. An enrolled actuary sets the annual funding requirement, and the plan must be adopted and funded by its deadlines, so the design decision belongs in the planning year rather than at filing time.

When does equipment and real estate timing matter?

A dental practice buys expensive, long-lived equipment: operatory chairs, digital imaging, CAD/CAM milling, lasers. Placing equipment in service in the right year and electing to expense much of the cost under section 179 or bonus depreciation, reported on Form 4562, can move a large deduction into a year that needs it. The discipline is the same as any capital decision: the equipment has to earn its place clinically and pay for itself. The deduction improves the timing; it does not justify a purchase the practice did not need.

A dentist who owns the building the practice operates from should almost always hold it in a separate entity and lease it to the practice at a market rate. That separates a valuable asset from the practice's liability, creates a rent-paying asset the dentist keeps, and opens real estate depreciation. The self-rental rules under section 469 govern how that rental income and loss are treated on the owner's return, and the lease must be written and the rent supported by comparable market rates.

What are the limits and examination issues for dental practices?

Two examination issues are specific to dentistry. The first is associate-dentist classification: whether an associate is properly an employee or an independent contractor is a recurring point of dispute, and treating an employee as a contractor carries payroll-tax exposure plus penalties. The second is owner reasonable compensation, where a salary set too low relative to the owner's clinical work is the pattern examiners look for. In both cases, documentation created in advance is what protects the position.

These levers also have practical limits. A defined benefit plan requires contributions for eligible staff, not just the owner, and its funding obligation continues in lean years. Equipment expensing only shifts the deduction earlier; it does not create a deduction the practice would not otherwise have. Contribution and expensing limits adjust each year, so confirm current figures with your advisor and revisit the whole structure periodically rather than assuming the setup from the practice's early days still serves it.