Dental Practice Entity Structure: LLC, S-Corp, Partnership, and When to Change

Entity structure is one of the few tax decisions a dentist makes that keeps paying (or costing) every single year. The good news: for most Florida practice owners the decision tree is short. The bad news: the two most common mistakes — electing S-corp status too early, and electing it in a way that sabotages a future buy-in — are both popular.

Key takeaways

• In Florida, dentists practice through a professional association (PA) or professional limited liability company (PLLC); ownership is restricted to licensed dentists.
• The default tax treatment (sole proprietorship or partnership) puts all practice profit through self-employment tax. The S-corp election is fundamentally a payroll-tax play.
• The S election starts making sense when practice net income comfortably exceeds what a reasonable salary for your role would be — for most owners, roughly $150,000+ of net.
• Dentistry is a "specified service" business, so the 20% QBI deduction phases out at higher incomes regardless of entity — don't let anyone sell you an entity change as a QBI fix.
• Partnerships (multi-member PLLCs) offer flexibility S-corps can't: special allocations, profits interests for associates, and basis step-ups. If a buy-in is coming, think twice before locking into S-corp.

The Florida legal layer

Florida law limits who can own a dental practice: licensed dentists, through entities organized for professional practice. In practice that means a PA (professional service corporation) or a PLLC. Neither the legal wrapper nor the state filing determines your taxes — a PLLC can be taxed as a sole proprietorship, partnership, or S corporation, and a PA is a corporation that almost always elects S status to avoid double taxation.

Two Florida facts frame everything: there's no state personal income tax, and the 5.5% Florida corporate income tax applies to C corporations but generally not to S corporations or partnerships. That makes C-corp status for the clinical entity rare and usually inadvisable — profits would face federal corporate tax, Florida corporate tax, and then dividend tax on the way out. (C corporations show up in dentistry mainly on the management-company side of DSO structures — see our DSO guide.)

So the real choice is between pass-through default treatment and the S-corp election, layered on either a PLLC or PA.

The self-employment tax math

A solo owner with no election reports practice profit on Schedule C, and the entire profit is subject to self-employment tax: 15.3% (Social Security + Medicare) up to the Social Security wage base — $184,500 for 2026 — then 2.9% Medicare above it, plus the 0.9% additional Medicare tax at higher incomes. Half of SE tax is deductible, but the bill is still substantial.

With an S election, the owner becomes an employee of their own practice. Profit splits into reasonable W-2 salary (subject to payroll taxes) and distributions (not subject to payroll taxes). The savings live in the gap between total profit and the salary.

Worked example: practice nets $350,000. As a Schedule C dentist, SE tax runs roughly $32,000. As an S corp paying a $200,000 salary — defensible for a producing owner-dentist in South Florida — payroll taxes apply to the $200,000 and the remaining $150,000 flows out as distributions free of the 2.9–3.8% Medicare-range taxes and, more importantly, the salary is what caps the Social Security portion. Net savings typically land in the $8,000–$15,000-per-year range at this income level, growing as profit grows.

The catch is "reasonable." The IRS's most common S-corp attack is unreasonably low owner salary. A dentist personally producing $900,000 who pays herself $60,000 is not defensible. Benchmark against what you'd pay an associate to do your clinical production — production-based associate comp of 28–35% of collections is a natural anchor — plus something for management.

Why not elect immediately at startup? Below roughly $130,000–$150,000 of net income, nearly all the profit is reasonable salary, so there's little distribution left to shelter — while you've added payroll processing, a corporate tax return (1120-S), and reasonable-comp exposure. New practices with buildout debt and ramp-up losses usually do better staying on the default for a year or two. And S-corp losses can only be deducted up to your stock and loan basis — a wrinkle that matters in leveraged startup years.

The QBI reality check for dentists

The 20% qualified business income deduction under IRC §199A was made permanent, but dentistry is a specified service trade or business (SSTB). Above the taxable-income phase-out range — beginning a bit over $400,000 for joint filers in 2026, roughly half that for single filers — the deduction disappears entirely for SSTB owners, no matter the entity. Below the threshold, both Schedule C and S-corp income can qualify, and note the interaction: S-corp salary is not QBI, so a bigger salary shrinks the deduction. For owners in the phase-out zone, the S-corp payroll savings and the QBI cost partially offset — this is exactly the modeling a CPA should run on your actual numbers rather than a rule of thumb.

Multi-owner practices: partnership vs. S-corp

Two-plus-dentist practices choose between a multi-member PLLC taxed as a partnership and an S corporation. The partnership form is more flexible in ways that matter for succession:

• Special allocations — profit can follow each doctor's production rather than rigid ownership percentages. S-corps must allocate strictly pro-rata to shares.
• Profits interests — a partnership can grant an incoming associate a share of future growth with no day-one tax. S-corps have no equivalent; their single-class-of-stock rule also forbids preferred economics.
• Basis step-up on buy-ins — a §754 election lets a buying partner get inside basis for what they paid, improving their future deductions. S-corp buyers get outside basis only.

The trade-off: partners' guaranteed payments and distributive shares are generally subject to self-employment tax, so the payroll-tax play is weaker. A common hybrid: each dentist owns their partnership interest through their own S corporation. It works but adds compliance cost and complexity — worth it at scale, not for a two-doctor practice netting $400,000 combined.

When to change, and when not to

Triggers worth acting on: net income sustainably above ~$150,000 (consider the S election — file Form 2553 within 2 months and 15 days of the year's start, or elect for next year); adding a second owner (revisit everything — the buy-in structure may favor partnership); planning a DSO exit (asset-sale mechanics and rollover structures differ by entity; get advice before the LOI, since fixing entity problems mid-deal is expensive); or an approaching associate buy-in (don't elect S-corp the year before you want to grant a profits interest).

Changes to avoid: revoking an S election casually (a five-year wait before re-electing), and moving appreciated assets out of a corporation (taxable at fair market value).

Official sources

• IRS — S corporation election, Form 2553: https://www.irs.gov/forms-pubs/about-form-2553
• IRS — Self-employment tax: https://www.irs.gov/businesses/small-businesses-self-employed/self-employment-tax-social-security-and-medicare-taxes
• IRS — Qualified business income deduction: https://www.irs.gov/newsroom/qualified-business-income-deduction
• Florida DOR — Corporate income tax: https://floridarevenue.com/taxes/taxesfees/Pages/corporate.aspx

Practitioner note: The question we ask before any S election: "What does your practice look like in five years?" If the answer includes a partner, a DSO, or a second location, the cheapest structure for this year's taxes is often the most expensive structure for that transaction.

Fairlight models entity elections against your actual production, comp, and exit plans — including cross-border owners with Canadian filing obligations layered on top. Contact us or see pricing.