Going from W-2 associate to practice owner is the biggest financial shift in a dentist's career. As an associate, taxes are straightforward: your employer withholds everything, and you file a relatively simple return. As an owner, you're suddenly responsible for estimated taxes, self-employment tax, entity elections, retirement plan design, and depreciation strategy — all at once. The dentists who plan this transition proactively save $30,000–$80,000+ in their first year compared to those who figure it out as they go.
The Tax Shock: W-2 to Self-Employed
As a W-2 associate earning $180,000, your employer pays half of your FICA taxes (7.65%), withholds federal and state income tax from every paycheck, and handles all the paperwork. Your total tax burden feels manageable because you never see most of it.
As a practice owner earning $350,000 in net income through a sole proprietorship or single-member LLC, you suddenly owe:
That 15.3% self-employment tax (Social Security + Medicare on both the employer and employee sides) is the single biggest surprise for new practice owners. On $168,600 of income (the 2026 Social Security wage base), that's approximately $25,800 in self-employment tax alone — money that was split with your employer when you were an associate.
Entity Selection: Make This Decision First
The entity you choose for your new practice determines your tax structure for years. Most attorneys default to a single-member LLC, which is fine for liability protection but does nothing for tax savings. For nearly every dentist transitioning to ownership with expected net income above $80,000, the S-Corp election should be evaluated immediately.
How the S-Corp saves money: Instead of paying self-employment tax on all net income, you pay yourself a reasonable salary (say $160,000) and take the remaining profit ($190,000) as a distribution. The distribution is not subject to FICA taxes, saving you approximately $14,500 per year in this example.
Timing matters: The S-Corp election (Form 2553) must be filed within 75 days of the start of the tax year you want it to take effect. If you're buying or starting a practice, coordinate this with your tax strategist before the entity is formed — or immediately after.
| Entity Type | SE Tax Treatment | Best For |
|---|---|---|
| Sole Proprietorship | 15.3% on all net income | Very early stage, income under $60K |
| Single-Member LLC | 15.3% on all net income (same as sole prop) | Liability protection, but no tax benefit |
| LLC taxed as S-Corp | FICA only on salary; distributions exempt | Most dental practice owners (net income $80K+) |
Estimated Taxes: Don't Get Caught Off Guard
As a W-2 employee, taxes are withheld every pay period. As an owner, you're responsible for making quarterly estimated tax payments (April 15, June 15, September 15, January 15). Miss these deadlines and you'll face underpayment penalties — even if you pay the full amount at tax time.
The safe harbor rule says you won't be penalized if you pay at least 100% of your prior-year tax liability (110% if your AGI exceeds $150,000) through estimated payments and withholding. In your first year as an owner, your prior-year tax was based on a W-2 salary — so your safe harbor amount may be significantly lower than what you'll actually owe. This gives you some breathing room in year one, but don't let it create a false sense of security.
Retirement Plans: Your Biggest New Deduction
As an associate, your retirement options were likely limited to a 401(k) match offered by the practice. As an owner, you can design your own retirement plan — and the tax savings are substantial.
Solo 401(k): If you have no employees (or only a spouse), a solo 401(k) allows contributions up to $69,000+ in 2026 (including employee and employer portions). This is the simplest option for new practice owners.
401(k) with profit sharing: Once you hire staff, you'll need a traditional 401(k). Structure the profit-sharing component to maximize your own contributions while managing the cost of employee matching.
Defined benefit plan: For practice owners earning $300K+, a defined benefit plan allows tax-deductible contributions of $100,000–$300,000+ per year. This is the most powerful retirement tax strategy available and should be evaluated within the first 1–2 years of ownership.
First-year move: Establish a solo 401(k) or SEP-IRA before December 31 of your first year as an owner. Even a late-year start allows you to make a meaningful employer contribution that reduces your first-year tax bill. The defined benefit plan can be added in year two once your income stabilizes and you have a better picture of sustainable contributions.
Equipment and Depreciation Strategy
Whether you're buying a practice (with existing equipment) or starting from scratch, your equipment depreciation strategy has major first-year implications. Section 179 allows you to deduct up to $1,250,000 of qualifying equipment in the year it's placed in service — meaning that $85,000 CBCT machine or $120,000 in dental chairs can be deducted immediately instead of over 5–7 years.
If you're acquiring an existing practice, the purchase price allocation determines how much of your acquisition cost can be classified as depreciable equipment. This is negotiated before closing and has a direct impact on your tax bill for years.
Cost Segregation: If You Own the Building
If you purchase the building (or make significant improvements to a leased space), a cost segregation study should be one of your first moves. This engineering analysis reclassifies portions of the building from 39-year depreciation to 5, 7, or 15-year property — unlocking hundreds of thousands in accelerated deductions.
For a new practice owner buying a $1.2M building, cost segregation typically reclassifies $240,000–$480,000 into shorter-lived categories, generating $40,000–$90,000+ in first-year tax savings.
The First-Year Checklist
Here's what to address in your first 12 months as a practice owner:
Before closing / opening: Choose entity structure, file S-Corp election if applicable, negotiate purchase price allocation (if acquiring).
Month 1–3: Set up payroll and reasonable salary, establish estimated tax payment schedule, open business banking.
Month 3–6: Establish retirement plan (solo 401(k) or SEP-IRA), run cost segregation study (if applicable), review equipment depreciation options.
Month 6–9: Mid-year tax projection with your strategist, adjust estimated payments if needed.
Month 9–12: Year-end planning — equipment purchases, retirement contributions, income timing decisions.
Transitioning from associate to owner? The decisions you make in the first 12 months set your tax foundation for years. We'll build a custom tax plan covering entity structure, retirement plans, and depreciation strategy — before you sign anything.
Book a Free Transition Review →The Bottom Line
The jump from W-2 associate to practice owner is exciting — but it comes with a $30,000–$80,000 tax planning gap in year one alone. The dentists who bring in a tax strategist before (or immediately after) the transition capture those savings from day one. Those who wait until tax season to figure it out pay the price in overpaid taxes, missed deductions, and suboptimal entity structures that take years to unwind.