Tax Deductions for Dentists: The 2026 Practice Owner’s Guide

You spent years mastering clinical precision. A missed margin, a hairline microleak, a restoration that fails early all cost you and your patient. Your practice finances work the same way. A deduction you never claimed, an equipment purchase timed one week too late, a salary set without a defensible basis: each one quietly drains money you earned and were entitled to keep.

The pressure is real. According to the American Dental Association’s Health Policy Institute, the average net income for dentists in private practice in 2025 was $215,320 for general dentists, on average gross billings of $965,660. Yet the ADA also reports that practice revenues rose only about 1.4% over a recent five-year period while expenses climbed 4.9%, a “fiscal squeeze” that makes every legitimate tax dollar saved more valuable than it was a decade ago. Overhead in the typical practice runs 60% to 65% of collections, so the tax return is one of the few levers left that can meaningfully change what you take home.

This guide breaks down the tax deductions for dentists that actually move the needle in 2026, written from a practice-owner’s point of view and updated for the One Big Beautiful Bill Act (OBBBA), which became law on July 4, 2025 and rewrote several rules dental practices rely on. The theme throughout is simple: the biggest savings come from strategic tax planning, not just tax preparation, so the most useful moves happen well before you file. A quick, honest disclaimer up front: this is educational information, not advice for your specific return. Tax outcomes depend on your entity, income, state, and facts, so treat the judgment calls here as conversations to have with your CPA, not formulas to apply blind.

How dental practice taxes actually work

Before the line items, understand the structure, because structure drives almost everything else.

Most dental practices are pass-through entities: a sole proprietorship, a single- or multi-member LLC or PLLC, or an S corporation. “Pass-through” means the business itself usually pays no federal income tax; profit flows to your personal return, which is why disciplined business tax return preparation is the foundation every deduction below depends on. Many states require dentists to operate as a professional corporation (PC) or professional limited liability company (PLLC) rather than a plain LLC, so confirm your state’s rule.

A deduction reduces your taxable income. A credit reduces your tax dollar for dollar and is generally more valuable. The governing standard for any business deduction is that the expense be ordinary and necessary to running the practice, common in dentistry and helpful to the business. That phrase is the line between a defensible write-off and an audit problem.

As of 2023, the ADA reports that fewer than three-fourths of U.S. dentists, 72.5%, are private-practice owners, down from 84.7% in 2005. If you are in that ownership group, the deductions below are yours to claim. If you are an associate, several still apply, but the biggest planning levers belong to owners.

Everyday operating deductions

These are the bread-and-butter write-offs. Individually small, collectively large. Keep clean records and consistent expense categories; the IRS rewards substantiation and “miscellaneous” helps no one.

Quick checklist of commonly missed everyday deductions:

• Merchant/credit-card processing fees
• Bank fees and loan interest on business debt
• Uniforms/scrubs and laundering
• Patient-giveaway items (toothbrushes, floss)
• Software you forgot you subscribed to (audit your statements annually)
• Business meals (generally 50% deductible with documentation; note OBBBA tightened employer-provided staff meals, many of which are no longer deductible in 2026 unless treated as taxable compensation, so confirm current treatment with your CPA)

Many of these line items apply to any business, so for a broader starting point see our guide to the top 10 business tax deductions, and note that the same industry-specific approach drives our tax deductions for restaurant owners guide. One compliance item dentists often overlook: if your practice sells take-home products such as whitening kits or electric toothbrushes, those retail sales can carry sales-tax obligations, and staying current on sales tax filing keeps a small revenue stream from becoming an audit headache.

Equipment: Section 179 vs. 100% bonus depreciation in 2026

For dentists, equipment is not optional. A CBCT cone-beam scanner, a CEREC or other CAD/CAM mill, an intraoral scanner, new operatory chairs, sterilization systems: these are large, recurring investments. The tax code lets you accelerate the deduction instead of spreading it thinly over years, and OBBBA made the two main tools more powerful and, crucially, permanent.

100% bonus depreciation (IRC §168(k)). OBBBA permanently restored 100% first-year bonus depreciation for qualifying property acquired and placed in service after January 19, 2025. The phase-down schedule that had dropped the bonus to 60% in 2024 and would have cut it to 40% in 2025 is gone. There is no dollar cap, and bonus depreciation can create or increase a business loss.

Section 179 expensing. Per IRS Rev. Proc. 2025-32, for tax years beginning in 2026 the Section 179 maximum deduction is $2,560,000, the phase-out begins when total qualifying property placed in service exceeds $4,090,000 (fully phased out at $6,650,000), and the deduction for a heavy SUV cannot exceed $32,000. Unlike bonus depreciation, Section 179 cannot create a loss; it is limited to business income. Both elections are claimed on IRS Form 4562, which your CPA files with the practice return.

The “placed in service” trap. To deduct equipment this year it must be operational, not just delivered, by December 31. A CBCT unit that arrives December 30 but is not calibrated and ready for patients until January 3 is a next-year deduction. Q4 installers get swamped, so order early.

Illinois / state-conformity caution. Not every state conforms to federal bonus depreciation. Section 179 is more widely recognized at the state level, which is one reason your CPA may elect Section 179 on specific assets even when the bonus would otherwise do the job. Confirm Illinois treatment before assuming your federal deduction flows straight through to the state return.

A word of judgment: depreciation is timing, not free money. Deducting an asset to zero today means a lower basis later; if you sell that equipment, the gain is recaptured as ordinary income. And never buy equipment solely for the deduction. Buy it because it makes clinical and operational sense, then let the tax benefit follow.

Worked example: Dr. Maria Chen

Dr. Chen owns a general practice taxed as an S corporation, collecting $1.1 million a year. In 2026 she purchases and places in service a $150,000 CBCT cone-beam imaging system.

• Under 100% bonus depreciation, she deducts the full $150,000 in 2026 rather than roughly $21,000 per year over seven years.
• If her marginal federal rate plus Illinois tax lands around 37% combined, that first-year deduction is worth roughly $55,500 in tax saved, cash she can redirect to debt, payroll, or retirement funding.
• Because she is an S-corp owner, she also reviews her reasonable compensation: she pays herself a defensible market salary for an owner-dentist in her area (documented with comparable data), takes the remainder as distributions, and runs the QBI math (below) to make sure her salary level does not needlessly erode her Section 199A deduction.
• She does not buy the scanner because of the deduction. She buys it because her case mix justifies in-house 3D imaging. The tax savings simply improve the return on a decision she would make anyway.

This is the difference between reacting in April and planning in Q3: the deduction was always available, but the timing, the entity, and the salary all had to be set deliberately to capture it cleanly.

The QBI deduction, and why dentistry is an SSTB

The Qualified Business Income (QBI) deduction under IRC §199A lets eligible pass-through owners deduct up to 20% of qualified business income. OBBBA made this deduction permanent, removing the 2025 sunset that had clouded planning, and starting in 2026 it adds a minimum deduction of $400 for active owners with at least $1,000 of QBI.

Here is the catch that matters specifically to dentists: dentistry is a Specified Service Trade or Business (SSTB). For SSTBs, the deduction phases out entirely above an income threshold.

• 2025 (returns filed in 2026): the SSTB phase-out runs from $394,600 to $494,600 of taxable income for married filing jointly, and $197,300 to $247,300 for single filers. Above the top of that range, an SSTB owner gets no QBI deduction.
• 2026 (per IRS Rev. Proc. 2025-32): the threshold rises to $403,500 MFJ and $201,750 single/head of household. OBBBA widened the phase-in window to $150,000 (MFJ) and $75,000 (single), so for dentists the deduction fully phases out at $553,500 MFJ and $276,750 single.

Why this is the most valuable section of this guide: because the deduction disappears at higher incomes, the strategies that lower your taxable income, especially retirement contributions, can do double duty by also pulling you back under the QBI ceiling and restoring some or all of a 20% deduction. A deduction that saves tax twice is worth planning for deliberately. Run the numbers with a CPA; the interaction between salary, retirement funding, and the SSTB threshold is exactly where dental-savvy planning pays off.

S-corp election and reasonable compensation

Roughly half of dental practices operate as S corporations, and for good reason: only your W-2 wages are subject to the 15.3% Social Security and Medicare tax, while distributions are not. The savings can be real, though they come with an extra filing each year, which is where careful corporate tax return preparation earns its keep.

But the IRS requires S-corp owner-employees to pay themselves reasonable compensation for the services they actually perform, and this is one of the most-audited issues in small-business tax. There is no magic ratio; “reasonable” means what the market would pay a dentist to do your clinical and management work, supported by data (Bureau of Labor Statistics, RCReports, salary surveys) and your own time logs.

The audit triggers are well documented:

• A very low or zero salary paired with large distributions.
• A salary that stays flat while profit climbs.
• Compensation far below local market benchmarks for a dentist.

There is also a trade-off with QBI: S-corp salary is not QBI, so a higher salary lowers your QBI base, while a lower salary saves payroll tax but invites scrutiny and may also limit retirement contributions tied to W-2 wages. The right number is the one you can defend in writing. Document it, run it through a compliant payroll processing system so the wages and taxes are reported correctly, and revisit it annually as profitability grows.

Retirement plans that double as tax strategy

For high-earning dentists, retirement plans are the most powerful legal lever to reduce taxable income, and they pair perfectly with the QBI strategy above. Yet industry data has long suggested only about a quarter of dentists max out their available retirement options.

• SEP-IRA: simple, employer-funded up to 25% of compensation, with a 2026 cap of $72,000. Easy, but less flexible than a Solo 401(k) and harder to max at lower incomes.
• Solo 401(k): for owner-only practices (you and a spouse). Per the IRS, the total one-participant 401(k) limit is $72,000 in 2026 ($80,000 with catch-up for ages 50+, or up to $83,250 for ages 60–63), with the employee elective deferral portion at $24,500. Note the SECURE 2.0 rule: starting in 2026, catch-up contributions for those who earned more than $145,000 to $150,000 in the prior year must be made as Roth.
• Cash balance / defined benefit plan: the heavy artillery for established, high-income dentists who have maxed a 401(k). Contributions are actuarially determined and age-dependent, and can reach roughly $290,000 or more per year for an older owner, all fully deductible. These require annual actuarial work and a multi-year funding commitment, so they suit stable, high-profit practices.

The strategic point: every pre-tax dollar you contribute lowers taxable income today, builds wealth, and may rescue your QBI deduction by dropping you under the SSTB threshold. That is three benefits from one decision.

Advanced and often-missed strategies

• The Augusta rule (IRC §280A(g)). You can rent your personal residence to your practice for up to 14 days a year, deduct the rent at the business, and exclude the income personally, but only with a real business purpose (board meetings, planning sessions), fair-market pricing, and documentation. The Tax Court’s Sinopoli decision capped inflated, poorly documented rent, so keep agendas, attendee lists, minutes, and FMV support. For S-corp owners this is legitimate; for sloppy documentation it is an audit magnet.
• Hiring your children. Wages for genuine work shift income to a lower bracket. For 2025, a child’s standard deduction is $15,750, so reasonable wages for real work can be federally tax-free to the child. In a sole proprietorship or parent-only partnership, wages to a child under 18 avoid FICA; in an S-corp or C-corp, normal payroll taxes apply. Document the job, pay a market rate, and keep timesheets.
• Vehicle/auto. Business mileage between locations, to suppliers, and to CE events is deductible (commuting is not). Track contemporaneously with an app; reconstructed logs get disallowed.
• Home office. Deductible only for space used regularly and exclusively for practice business; note the interaction with the Augusta rule and accountable plans if you operate as a corporation.
• HSA. With a high-deductible health plan, an HSA offers a deduction now, tax-free growth, and tax-free medical withdrawals.
• Cost segregation. If you own your building, a study can accelerate depreciation on components, valuable for owners with real estate.
• PTET / SALT. Many states allow a pass-through entity tax election so the practice deducts state income tax at the entity level, working around the federal SALT cap. Confirm Illinois rules with your CPA.
• Student loan interest. Up to $2,500 of interest may be deductible, subject to income limits, relevant for early-career owners still carrying dental-school debt.

Buying or buying into a practice

If you acquire a practice, how the purchase price is allocated drives your deductions for years. Equipment can be expensed or depreciated quickly; goodwill and other §197 intangibles must be amortized over 15 years on a straight-line basis. Buyers generally prefer more value allocated to equipment (faster write-off); sellers prefer goodwill (capital-gain treatment). Both parties report the allocation on Form 8594, so it must match.

Watch the anti-churning rules under §197 when buying into a practice with a related party or existing co-owner; they can deny goodwill amortization in certain family or common-ownership situations. Before you buy, lenders and partners will also want clean numbers, and a professional financial statement compilation helps you evaluate the target and secure financing. This is specialized terrain; involve a dental-experienced CPA before signing.

Common dental-practice audit triggers

• Unreasonably low S-corp salary with large distributions (the top trigger).
• Aggressive Augusta rule or home-office claims without documentation or fair-market support.
• Personal expenses on business cards; commingled finances.
• Round-number or estimated deductions without receipts or logs.
• Equipment “placed in service” timing that does not match invoices and installation records.

The defense is the same in every case: a clean paper trail, consistent categories, contemporaneous logs, and a defensible rationale written down before, not after, the IRS asks.

Year-end tax checklist for dental practices

• Confirm retirement-plan contributions are on track to your target.
• Review planned equipment purchases and confirm realistic “placed in service” dates before December 31.
• Verify estimated tax payments are current to avoid penalties.
• Review collections vs. overhead with your CPA for year-end adjustments.
• Document all CE and professional-membership expenses.
• Reassess reasonable compensation against current profitability.
• Run the QBI/SSTB projection and decide whether extra retirement funding preserves the deduction.
• Schedule a planning meeting in Q3 or Q4, decisions made in December cannot be undone in April.

Frequently Asked Questions

1. What can dentists write off on their taxes?
   Practice owners can deduct ordinary and necessary business expenses: staff wages and benefits, lab fees, dental supplies and PPE, rent and utilities, equipment (via Section 179 or bonus depreciation), malpractice and liability insurance, ADA and license fees, continuing education, marketing, software, and professional fees. Personal items like student loan interest may also help on your individual return, subject to limits.
2. Can dentists deduct the full cost of equipment like a CBCT or CEREC machine?
   Often yes. Under 100% bonus depreciation (permanent after OBBBA for property placed in service after January 19, 2025) or Section 179 (up to $2,560,000 in 2026), you can deduct the full cost in the year the equipment is placed in service, meaning operational, not just delivered. Confirm state conformity, as Illinois and other states may treat bonus depreciation differently.
3. Do dentists qualify for the 20% QBI deduction?
   Yes, but with a catch. Dentistry is a Specified Service Trade or Business (SSTB), so the deduction phases out at higher incomes: for 2026 it begins phasing out at $403,500 (MFJ) / $201,750 (single) and disappears entirely at $553,500 (MFJ) / $276,750 (single). Lowering taxable income, often through retirement contributions, can preserve it.
4. Should my dental practice be an S corporation?
   Many are, because only W-2 wages face the 15.3% payroll tax while distributions do not. But you must pay yourself reasonable compensation, and a low salary is a top audit trigger. There is also a trade-off with QBI. The right answer depends on your income and facts; model it with a CPA.
5. What is reasonable compensation for a dentist with an S-corp?
   It is what the market would pay a dentist to do your clinical and management work, supported by data and your time records. There is no fixed ratio. The IRS flags low or zero salaries paired with large distributions, so document your number and revisit it as profit grows.
6. What retirement plans give dentists the biggest tax deduction?
   For owner-only practices, a Solo 401(k) (up to $72,000 in 2026, more with catch-up) usually beats a SEP-IRA. High-income, established owners can add a cash balance/defined benefit plan to shelter $100,000 to $290,000+ annually. Contributions reduce taxable income and can help preserve QBI.
7. Is the Augusta rule legal for dentists?
   Yes. IRC §280A(g) lets you rent your home to your practice up to 14 days a year, deduct the rent at the business, and exclude the income personally, if the meetings are legitimate, priced at fair market value, and well documented. The Tax Court has penalized inflated, undocumented arrangements, so keep agendas, minutes, and FMV support.
8. Can I hire my children in my dental practice for tax savings?
   Yes, for genuine, age-appropriate work at a market wage. For 2025 a child’s standard deduction is $15,750, so reasonable wages can be federally tax-free to them. In a sole proprietorship or parent-only partnership, wages to a child under 18 avoid FICA; in an S-corp, normal payroll taxes apply.
9. Can dentists deduct continuing education?
   Yes, if the education maintains or improves skills in your current profession. That includes tuition, registration, materials, and related travel and lodging. Education that qualifies you for a new profession is not deductible.
10. How are taxes handled when buying a dental practice?
    The purchase price is allocated among assets. Equipment can be depreciated quickly, but goodwill and other §197 intangibles must be amortized over 15 years. Allocation is negotiated and reported on Form 8594. Watch the anti-churning rules in related-party buy-ins; involve a dental CPA before signing.
11. What triggers an IRS audit for a dental practice?
    Common triggers include an unreasonably low S-corp salary with large distributions, aggressive Augusta-rule or home-office claims without documentation, personal expenses on business cards, and missing records for equipment timing or mileage. Clean documentation is your best defense.
12. Are my own dental bills tax deductible?
    That is separate from practice deductions. Per IRS Topic No. 502, personal medical and dental expenses are deductible only as itemized deductions to the extent they exceed 7.5% of your adjusted gross income, and only if you itemize. Cosmetic procedures generally do not qualify.

Key takeaways

• The biggest dental tax savings come from planning, not filing: entity choice, equipment timing, reasonable compensation, and retirement funding.
• OBBBA made 100% bonus depreciation and the 20% QBI deduction permanent, and raised Section 179 to a $2,560,000 cap for 2026.
• Because dentistry is an SSTB, high earners must actively manage taxable income to keep the QBI deduction, and retirement contributions are the best tool to do it.
• Depreciation is timing, not free money; never buy equipment solely for a write-off.
• Documentation is your audit defense. When in doubt, consult a CPA who knows dental practices.

If you want a second set of eyes on your practice’s structure and deductions, the licensed CPAs on our team work with dental practice owners across Illinois, the Chicago metro, and remotely nationwide. Schedule a free consultation or learn more about our dental CPA services.

This article is for educational purposes and is current as of June 2026. Tax law changes; confirm figures and strategies with your CPA before acting.