Dental Practice Tax Deductions: The Complete 2026 Checklist

A dental practice owner netting $350,000 with no active tax strategy often pays 35–40% of that to federal and state taxes. The same dentist with a complete deduction strategy — entity structure, retirement stacking, and full use of equipment expensing — frequently lands in the low 20s on effective federal rate. The difference isn't loopholes. It's knowing the full list.

This guide covers every category of deductible expense for dental practice owners in 2026, with real numbers and dental-specific examples. The largest deductions are retirement contributions and equipment — read those sections first. Everything else is real money too, but smaller.

1. Retirement plan contributions — the largest deduction available

No other deduction category comes close. A solo practice owner who maximizes a Solo 401(k) and cash balance plan can shelter $150,000–$290,000+ per year in pre-tax contributions — all fully deductible to the practice (or to you, on Schedule C/SE). At a 37% marginal rate, $200,000 in contributions saves $74,000 in federal tax that year alone.

The Solo 401(k) and cash balance plan can be combined. A 52-year-old dentist netting $500,000 in an S-corp paying herself a $175,000 W-2 salary can contribute: $24,500 (employee deferral) + $43,750 (employer profit sharing at 25% of $175K) + ~$165,000 (cash balance) = approximately $233,250 fully deductible. Federal tax savings at a 37% marginal rate: ~$86,000 in year one.¹

See Solo 401(k) guide and Cash Balance Plan guide for mechanics and setup.

2. Equipment and technology — accelerated expensing in 2026

Dental equipment qualifies for the most favorable depreciation rules in the tax code. The combination of Section 179 and bonus depreciation lets you deduct the full cost of equipment in year one rather than depreciating it over 5–7 years.

• Section 179 (IRC §179): Deduct up to $2,560,000 of qualifying equipment placed in service in 2026. The deduction phases out dollar-for-dollar once total equipment placed in service exceeds $4,090,000 — a threshold virtually no single dental practice reaches.²
• 100% bonus depreciation (OBBBA, permanent): For qualifying property placed in service after January 19, 2025, 100% first-year bonus depreciation is permanent under the One Big Beautiful Bill Act (July 2025). This applies to new and used equipment with a MACRS recovery period of 20 years or less — which includes all dental equipment and most practice technology.
• Regular MACRS depreciation: If you prefer to spread deductions over time (to stay inside QBI phase-out ranges or for other planning reasons), 5-year MACRS applies to dental equipment, 7-year to office furniture and most equipment. This is a choice — you're not required to take Section 179 or bonus depreciation.

What qualifies: CBCT scanners, CAD/CAM milling units, digital X-ray systems, intraoral scanners, dental chairs and delivery systems, sterilization equipment, practice management software, computers, phone systems, and office furniture. What does not qualify: the building itself (depreciates over 39 years) and land (not depreciable). Dental buildout improvements may qualify for cost segregation, which can accelerate significant depreciation — see dental office real estate guide.

3. Operating expenses — ordinary and necessary rule

Any expense that is (1) ordinary for a dental practice and (2) necessary for running one is deductible under IRC §162. This covers a broad list. The key test: is this a business expense or a personal expense? If it would exist whether or not you had the practice, it's personal.

4. Health insurance premiums and HSA contributions

Practice owners who pay for their own health insurance can deduct 100% of premiums as an above-the-line deduction (Self-Employed Health Insurance Deduction, IRC §162(l)) — reducing AGI without itemizing. This covers the owner, spouse, and dependents. Dental and vision premiums also qualify.

On a $25,000 annual health insurance premium for a family plan, the deduction saves roughly $9,250 in federal income tax at a 37% rate. Note that S-corp owners must route the premium through W-2 (included in Box 1, excluded from FICA) for the deduction to work — a common setup error.

HSA contributions (if enrolled in an HDHP): $4,400 (self-only) or $8,750 (family) for 2026, plus $1,000 catch-up at age 55+. HSA contributions are triple-tax-advantaged — deductible going in, tax-free growth, tax-free withdrawals for qualified medical expenses — making them one of the best per-dollar deductions available. See the HSA guide for mechanics.

5. Practice loan interest

Interest on loans used for the practice is deductible as a business expense under IRC §163:

• SBA 7(a) practice acquisition loan: All interest is deductible. On a $700,000 SBA loan at 9.5% interest, roughly $66,500 in interest is deductible in year 1 — worth about $24,600 in tax savings at 37%.
• Equipment loans: Interest is deductible in the year paid.
• Business line of credit: Interest on the drawn balance is deductible.
• SBA 504 real estate loan (if you own the building): Interest is deductible; the building itself depreciates over 39 years, with cost segregation potentially accelerating a portion.

Note: IRC §163(j) limits business interest deductions to 30% of adjusted taxable income for businesses with average annual gross receipts over $30 million. This threshold doesn't apply to virtually any single dental practice.

6. Vehicle expenses

Business-related driving is deductible — but commuting from home to your practice is not. Qualifying trips include: driving between two office locations, driving to a bank or supply vendor for practice business, travel to CE conferences and professional meetings, and site visits for a second location. Personal and commuting miles must be excluded.

Two methods — pick one per vehicle per year (and you can't switch mid-year):

• Standard mileage rate: 72.5 cents per mile for 2026 (IRS Notice 2026-10).³ Simplest method — multiply total qualifying miles by 72.5¢. A dentist who drives 8,000 qualifying miles in 2026 deducts $5,800.
• Actual expense method: Deduct the business-use percentage of all vehicle costs — gas, insurance, maintenance, registration, depreciation (or Section 179/bonus depreciation on the purchase). Can yield a larger deduction for expensive vehicles with high business-use percentages, but requires more recordkeeping.

For heavy SUVs and trucks with GVWR over 6,000 lbs (common for dentists with families or rural practices), Section 179 is limited to $32,000 in 2026. 100% bonus depreciation applies separately and is not subject to this SUV cap — so a qualifying truck over 6,000 lbs can potentially be fully expensed in year one. Passenger cars under 6,000 lbs GVWR are subject to luxury auto depreciation limits that significantly cap the deduction. Mileage logs are required regardless of method — the IRS considers vehicle deductions high-audit-risk.

7. Continuing education and professional development

CE required to maintain your dental license or improve skills used in your current practice is deductible (Reg. §1.162-5). This includes:

• Registration fees for dental CE courses, seminars, and conferences (e.g., ADA Annual Meeting, specialty academy meetings)
• Travel to CE: airfare, hotel, 50% of meals while traveling for business (meals alone are 50% deductible under IRC §274(n))
• Online CE subscriptions
• CE for implant, Invisalign, or other advanced technique certifications
• Dental textbooks and clinical journals (subscriptions to JADA, clinical reference materials)

CE that qualifies you for a new profession or specialty is generally not deductible — for example, courses to transition from general dentistry to a new specialty if you're not yet licensed in that specialty. The line is whether the education maintains or improves existing skills versus enabling a career change.

8. Professional dues and subscriptions

Annual dues to professional organizations are deductible: ADA membership ($600–$900/yr for most members), state dental association, county dental society, specialty academy memberships (AAO, AAOMS, AAP, AADSM, etc.), and relevant study clubs. Practice management consultants and coaching programs qualify as professional services.

Subscriptions to clinical software, billing platforms, patient communication tools, and business publications used for the practice are deductible. Personal subscriptions (Netflix, personal newspapers) are not, even if you sometimes review them in the office.

9. Home office deduction (limited applicability)

Most dentists do clinical work at their practice, not home. However, a dentist who uses a dedicated, exclusive-use space at home for administrative tasks — billing review, scheduling, financial planning, employee management — may claim a home office deduction under IRC §280A.

The simplified method: $5 per square foot of dedicated office space, up to 300 sq ft = maximum deduction of $1,500. The regular method allocates actual home expenses (mortgage interest or rent, utilities, insurance, depreciation) by the percentage of home used for business — potentially larger but more complex, and creates depreciation recapture risk if you sell the home.

The exclusive-use test is strict: the room must be used only for business, not occasionally. A guest bedroom with a desk doesn't qualify. Given dental income levels, this deduction is rarely worth the audit risk unless the space clearly qualifies.

10. Student loan interest (for associates and early-career dentists)

Up to $2,500 in student loan interest is deductible above-the-line under IRC §221. The deduction phases out for single filers with MAGI above approximately $85,000 (fully eliminated around $100,000) and for MFJ filers above approximately $170,000 (eliminated around $200,000) — 2026 limits adjusted slightly upward from 2025.⁴

Most established practice owners earn well above these thresholds and receive no deduction. New dental graduates and associates in their first 2–3 years of practice often qualify. For the strategy of accelerating loan repayment vs. investing, see dental school loan repayment guide.

11. The QBI deduction — 23% on qualifying income

The Qualified Business Income deduction (IRC §199A, made permanent under OBBBA at 23%) isn't an operating expense, but it functions like one. A practice owner with $300,000 of QBI can deduct $69,000 before calculating income tax — saving ~$22,000 at a 32% marginal rate. Dentistry is a specified service trade or business (SSTB), so the deduction phases out at higher income levels. See the Tax Strategies guide for how the retirement stack interacts with the QBI phase-out.

What you cannot deduct

Several expenses dentists attempt to deduct are disallowed:

• Your own dental work: Dentists cannot deduct the cost of dental care they perform on themselves or their families. It's a personal medical expense, not a business cost.
• Personal clothing: Scrubs that can be worn outside a clinical setting don't qualify. Specialized protective garb (lead aprons, sterile surgical gowns) may qualify; ordinary scrubs typically do not under IRS guidance.
• Commuting miles: The daily drive from home to your practice — regardless of distance — is not a business expense.
• Personal life insurance premiums: Term and permanent life insurance on your own life is personal. Key-person insurance paid by and payable to the practice is deductible (with specific rules under IRC §101(j)).
• Personal meals and entertainment: Entertainment expenses are completely nondeductible since TCJA (2017). Business meals are 50% deductible when directly related to business discussion — staff lunches in the office are 50% deductible; restaurant meals with friends are not.
• Practice acquisition down payment: The SBA equity injection (typically 10% of purchase price) is not an expense — it's a capital investment. The loan payments themselves split into deductible interest and non-deductible principal repayment.

Putting it together: deduction stack for a $350K practice owner

The numbers depend heavily on your specific situation — practice structure, age, income level, whether you have employees — and the deductions interact with each other (retirement contributions reduce QBI; S-corp salary level affects the employer profit-sharing ceiling). This is why practice-owner tax planning requires coordination between your CPA, financial advisor, and plan administrator rather than a static checklist.

Recordkeeping: what the IRS expects

A deduction you can't substantiate is a deduction you lose in audit. The IRS requires contemporaneous records — meaning records made at the time of the expense, not reconstructed from memory later. Minimum requirements:

• All business expenses: Receipts (or bank/credit card statements) and a brief note on business purpose. For amounts under $75, receipts aren't technically required under IRS rules, but records of the expense still are.
• Vehicle: A mileage log showing date, destination, business purpose, and total miles for each trip. Apps like MileIQ, Everlance, or TripLog do this automatically. Without a contemporaneous log, the IRS can disallow the entire vehicle deduction.
• Home office: Measurements of the dedicated space, floor plan of the home, calculation showing square footage percentage, and evidence of exclusive business use.
• Meals: Receipt plus the names of attendees and business topic discussed.

The most practical system: use a dedicated business bank account and business credit card for all practice expenses. Never mix personal and business spending. This alone makes substantiation vastly simpler and reduces audit risk.