Without proactive planning, dentists commonly overpay taxes. Missed deductions, poor entity structure, and a lack of advanced strategies all add up. This guide covers entity selection, retirement plans, depreciation, and lesser-known strategies — including alternative investments that can offset active income.
Key Takeaways
- Right entity structure and QBI eligibility can sharply cut how much of your practice income is taxed
- Max retirement contributions and tax-free fringe benefits for foundational, easy wins
- Section 179 and bonus depreciation write off equipment in the year you place it in service
- High earners with W-2 wages or capital gains can unlock large upfront deductions via alternative investments
- Work with a CPA who knows dental practices and current tax law (including the OBBBA)
Entity Structure and the QBI Deduction
Your practice's legal structure (sole proprietorship, LLC, or S-corp) shapes two things: how much self-employment tax you pay, and how exposed your personal assets are.
Many dentists start as sole proprietors or single-member LLCs, then elect S-corp status as income grows. That election lets you split earnings between salary and distributions, which can cut self-employment tax.
Entity choice also feeds directly into how much income qualifies for the QBI deduction below.
The QBI Deduction, and Why Dentists Get Squeezed
Dental practices are classified as Specified Service Trades or Businesses (SSTBs) under Section 199A. That classification matters because it caps who can claim the 20% Qualified Business Income deduction.
For 2026, per IRS Rev. Proc. 2025-32:
| Filing Status | Threshold | Phase-Out Complete |
|---|---|---|
| Married Filing Jointly | $403,500 | $553,500 |
| Single/Other | $201,750 | $276,750 |
Below the threshold, you get the full 20% deduction regardless of SSTB status. Above it, the deduction phases out completely by the upper limit.
The good news: the One Big Beautiful Bill Act made the QBI deduction permanent and widened the phase-in range (from $100,000 to $150,000 for joint filers), giving high earners more room before losing the deduction entirely.
Practical takeaways:
- Pull taxable income down with retirement contributions, depreciation timing, or IDC deductions from qualifying oil and gas partnerships that offset active W-2 and practice income
- Hold practice real estate in a separate entity to protect the asset and simplify tax treatment when you sell the practice or the building
- Review entity structure annually with a CPA, especially before buying a practice or adding partners
Retirement Contributions and Tax-Free Fringe Benefits
Retirement plans remain one of the most powerful, lowest-risk ways to shelter income. For 2026:
- Solo 401(k): Employee deferral of $24,500, plus employer contributions up to 25% of compensation, capped at $72,000 combined ($81,000 with catch-up if 50+)
- SEP IRA: Up to $72,000, based on 25% of compensation
- Cash balance plans: Defined benefit limit of $290,000, with contributions scaling with age
Combining a Solo 401(k) with a cash balance plan can push total annual deferrals past $350,000 for older, high-earning practice owners. That's a meaningful lever for staying under the QBI threshold.
SECURE 2.0 Startup Credits
Practices with 100 or fewer employees setting up a new retirement plan can claim a credit of up to $5,000 per year for three years to cover setup costs. Practices with 50 or fewer employees get 100% of eligible costs covered.
Fringe Benefits Worth Offering
Tax-free fringe benefits lower taxable compensation and support retention when structured correctly:
- Health, dental, and vision premiums paid by the practice
- Education assistance within annual IRS limits
- Cell phone reimbursement for documented business use
- HSA contributions paired with a high-deductible health plan
The Augusta Rule (IRC 280A(g)) lets you rent your home to the practice for up to 14 days a year for planning meetings or staff events. That rent is tax-free to you personally, and the practice deducts it. Document fair market value and a legitimate business purpose.
Depreciation and Expense Timing Strategies
Dental equipment (chairs, imaging systems, CAD/CAM machines) qualifies for accelerated write-offs. Two federal provisions drive most of the benefit:
- Section 179: For 2026, capped at $2,560,000, with phase-out starting at $4,090,000 in purchases. Cannot create a loss.
- Bonus depreciation: Currently 100% for qualified property placed in service after January 19, 2025. Unlike Section 179, it can create a net operating loss.
Beyond equipment elections, timing matters. Most dental practices use cash-basis accounting, so paying supply invoices or prepaying eligible expenses in December—not January—can pull deductions into the year you need them.
One caution: Don’t buy equipment only for the write-off. A new sensor or handpiece should improve care or throughput first; the tax benefit is secondary.
Advanced Strategy: Alternative Investments to Offset Active Income
Once entity structure, retirement, and depreciation are dialed in, high-income dentists often look for ways to shelter W-2 wages and capital gains, not just practice income. Most passive investment losses can only offset passive income. Oil and natural gas working interests are an exception. Under IRC Sec. 469(c)(3), a qualifying working interest is treated as nonpassive, so Intangible Drilling Cost (IDC) deductions can apply directly against active income, including W-2 wages and capital gains. IDCs typically represent 60-80% of total well costs, which creates a large first-year deduction. PetroVybe is one example of a private natural gas development company offering accredited investors this kind of structure. Its projects combine roughly 400 already-producing legacy wells with 57+ planned new wells across a 58,000-acre position in Lavaca County, Texas. Investors have historically seen first-year deductions in the 67-70% range against active income, with projected long-term passive distributions. This strategy fits a specific profile:
- Accredited investors — generally $1M+ net worth (excluding primary residence) or $200K individual/$300K joint income for two consecutive years
- $100,000+ in liquidity available for a single investment
- Diversification goals beyond stocks, bonds, and real estate Before committing capital to any oil and gas program, vet it the way you'd vet a practice acquisition:
- Check the track record — has leadership operated wells successfully before?
- Look for third-party validation — independent audits, engineering reports, verified investor reviews
- Understand the hold period — most direct working interests don't distribute for two to three years
- Talk to your CPA first — confirm the deduction actually fits your tax situation before wiring funds These are high-risk, illiquid investments. The tax benefit should never be the only reason to invest. Project fundamentals matter just as much.
Common Tax Planning Mistakes Dentists Make
Even strong tax strategies fall short when execution slips. Watch for these common pitfalls:
- Poor documentation: Undocumented Augusta Rule rentals, vague equipment-use logs, or missing rationale for entity elections all raise audit risk
- Infrequent CPA communication: Talking to your advisor only at filing time means missing windows for retirement contributions, equipment timing, and entity changes that require advance planning
- Spending to chase deductions: Buying equipment just because "it's a write-off" still costs you most of the outlay—evaluate ROI first, tax treatment second
Frequently Asked Questions
What is the 50-40-30 rule in dentistry?
It's a practice management benchmark, not a tax rule: roughly 50% of collections to overhead, 40% to net income before tax, with interpretations varying. Confirm exact ratios for your practice with a dental CPA.
What is the best business structure for a dental practice to save on taxes?
It depends on income and size, but many established practices benefit from an LLC taxed as an S-corp. Have a CPA review your specific numbers before switching.
Can dentists deduct student loan interest or continuing education costs?
Continuing education that maintains or improves your skills is generally deductible on Schedule C. Student loan interest is capped at $2,500 and phases out completely at $170,000 MAGI for married filing jointly. Many established dentists won't qualify.
How can dentists reduce taxes on the sale of their practice?
Consider structuring the sale as an asset sale versus stock sale, using installment sales to spread gains, or timing retirement contributions to offset the gain in the sale year.
Are there tax credits available for dental practices offering retirement plans?
Yes. The SECURE 2.0 Act offers up to $5,000 per year for three years to cover setup and administration costs for new retirement plans at small practices.
What is the difference between Section 179 and bonus depreciation for dental equipment?
Section 179 is capped by practice income and can't create a loss. Bonus depreciation has no income cap and can create a net operating loss, though the allowable percentage depends on current tax law.
