7 Tax Deductions Dental Practice Owners Leave on the Table Every Year
Sam's List Editorial | 2026-06-23
A $1.5M dental practice nets, on a good year, somewhere north of $350K to the owner. The owner pays tax on most of it. And every spring, a chunk of that tax bill exists only because nobody made a few elections that were sitting right there in the code.
The deductions below aren't loopholes. They're standard dental practice tax deductions that generalist accountants skip because they don't know what a CEREC machine is or why you bought a third operatory. Here are the seven that quietly cost owners five figures a year.
1. The dental practice tax deduction with a deadline: Section 179 on operatory equipment
Buy a $35,000 intraoral scanner, drop it into a chair, and you can expense the whole thing the year it's placed in service under IRC §179. The 2026 limit is $2.5 million of qualifying purchases, phasing out after $4 million in total spend — so a normal practice never hits the ceiling.
Here's the catch nobody mentions: §179 is an election. You have to claim it on the return for the year the equipment is placed in service. Miss the year, and you're stuck depreciating that scanner over five years instead of writing it off now.
"Placed in service" means installed and ready to use — not the day you signed the financing paperwork. Buy in December, install in January, and it's a next-year deduction.
2. Bonus depreciation on big-ticket tech is back to 100%
CEREC mills, cone-beam CT units, and soft-tissue lasers are exactly the kind of property that qualifies for bonus depreciation under IRC §168(k).
This one matters in 2026 because the number changed. Under the One Big Beautiful Bill Act, 100% bonus depreciation was restored — permanently — for qualifying property acquired and placed in service after January 19, 2025. For a few years it was phasing down (80%, then 60%); a lot of advice still floating around online quotes those old rates.
The math: a $120,000 cone-beam CT, placed in service in 2026, can be fully expensed in year one. At a 35% combined marginal rate, that's roughly $42,000 of tax deferred into the same year you wrote the check. Always confirm the current-year percentage before you cite it — but right now, it's 100%.
3. Hiring your college-age kids shifts income to a lower bracket
Your 19-year-old can run the front desk over the summer, manage the practice's Instagram, or scan and file charts. Pay them a real wage for real work, and that wage moves out of your top bracket and into theirs — often near zero after the standard deduction.
Two rules keep this clean. The work has to be legitimate, and the pay has to be reasonable for the job — you can't hand a teenager $40K to empty a recycling bin. Document the hours and the role like you would for any employee, because the IRS treats family payroll skeptically and the substantiation rules under Treas. Reg. 1.62-2 apply the same way they do for anyone else.
Done right, this isn't aggressive. It's payroll.
4. A building in a separate LLC, leased back to the practice
If you own your building, holding it in a separate LLC and leasing it back to the practice does two things at once.
The practice pays fair-market rent and deducts it as a business expense. The rent lands in the LLC, where the building's depreciation and mortgage interest offset most of it. You've created a clean, defensible deduction and you've walled the real estate off from practice liability — a malpractice claim against the practice doesn't reach the building.
The word that matters is fair-market. Charge yourself a rent a commercial landlord would charge for comparable space. Inflate it to manufacture a deduction and you've handed an auditor an easy adjustment.
5. The de minimis safe harbor expenses your small instruments
You buy hand instruments, small handpieces, sterilization trays, and supplies constantly. Technically, anything with a useful life over a year is a capital asset you'd depreciate. Practically, nobody wants to depreciate a $300 elevator.
The de minimis safe harbor (Treas. Reg. 1.263(a)-1(f)) lets you expense items up to $2,500 per invoice line immediately, as long as you have a written accounting policy in place at the start of the year. Most practices qualify and never elect it.
That's a few thousand dollars a year in instruments getting deducted now instead of dragged across a depreciation schedule. The only cost is a one-page policy and the election on your return.
6. The retirement plan that doubles as a deduction
A solo or small-group practice can run a 401(k) with a profit-sharing component and move serious money off the top of taxable income.
The total that can go into a defined-contribution plan for one person is capped by IRC §415(c) — in 2024 that combined limit was $69,000, indexed up each year, with an extra catch-up if you're 50 or older. Confirm the current-year figure before you fund it. For an owner clearing $350K, maxing employee deferrals plus profit sharing can deduct a meaningful slice of income while it compounds tax-deferred.
This is the rare deduction where the money stays yours. It's just sitting in your account instead of the Treasury's.
7. The biggest dental practice tax deduction lever: an S-corp election
If your practice is a sole proprietorship or LLC taxed as one, every dollar of profit gets hit with self-employment tax. An S-corp election splits your take into a reasonable salary (subject to payroll tax) and distributions (not subject to SE tax).
The math: on $300K of net income, paying yourself a defensible $160K salary and taking $140K as distributions can save roughly $20,000 in self-employment tax in a year — the 15.3% Social Security and Medicare load that would otherwise apply to the distributed portion. The salary has to be reasonable for a practicing dentist, or the IRS recharacterizes it. But for a profitable practice, this is often the single largest line item nobody ran.
Find a dental CPA who actually knows what a CEREC machine is
Every deduction above lives or dies on an election made at the right time and documented the right way. A generalist who files your 1040 the same way they file a plumber's will miss most of them — not out of malice, just because dental capital equipment, family payroll, and reasonable-comp math aren't their world.
Good Operator works the way a bootstrapped owner needs an accountant to work: cash-flow first, deduction-aware, and focused on what the practice keeps rather than what it grosses. They handle accounting, tax, and fractional CFO work for owner-operators — the people who actually sign the front of the checks.
Read Good Operator's verified reviews on Sam's List, then book an intro call. Bring last year's equipment invoices and your entity type — that's usually where the missed five figures are hiding.
This article is educational and not tax advice. The dollar figures are illustrative composites for teaching, not guaranteed outcomes. Confirm every current-year limit with a qualified CPA before you file.