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

The entity structure behind a dental practice controls far more than the annual state filing. It determines how much of the practice’s income is subject to self-employment tax, how liability flows between dentists who co-own the practice, whether an associate buy-in can happen without a restructuring, and what happens to goodwill when the practice eventually sells. Most dentists start as sole proprietors or single-member LLCs, layer on the S-corp election once the practice is profitable enough to justify it, and only encounter the partnership question when an associate is ready to buy in. Each of those transitions carries tax consequences, and the sequence matters. Getting the entity right from the start avoids the problem of restructuring under pressure when a buyer, a new partner, or the IRS forces the conversation.

What is the progression from sole proprietorship to LLC to S-corp for a dental practice?

The progression works the same way it does for other professional practices, though a few details are specific to dentistry. A dentist can begin as a sole proprietor, operate through an LLC (or PLLC in states that require the professional designation), and then elect S-corp treatment once the tax savings justify the added cost.

Sole proprietorship. A brand-new dentist who opens a practice without forming an entity is a sole proprietor by default. There’s no liability shield between the practice’s debts and the dentist’s personal assets, and every dollar of net income hits the self-employment tax base. This structure is common for the first year or two when the practice is still building its patient base and net income is modest. But it provides no protection against malpractice claims beyond what the dentist’s professional liability insurance covers, and it offers no mechanism for splitting income to reduce employment tax. Most dentists move past this stage quickly.

LLC or PLLC. Forming a limited liability company (or a professional limited liability company in states that require it for licensed professionals) gives the dentist state-law liability protection. A judgment creditor of the LLC generally cannot reach the dentist’s personal assets, though no entity form protects a dentist from liability arising from the dentist’s own clinical negligence. The LLC is a liability shield against business debts and claims that aren’t related to the dentist’s personal malpractice: a lease dispute, a slip-and-fall in the waiting room, an employment lawsuit from a hygienist.

For federal tax purposes, a single-member LLC is a disregarded entity. The IRS treats it exactly like a sole proprietorship. All net income flows to Schedule C and is subject to self-employment tax. The LLC provides liability protection but no tax benefit on its own.

Many states require dentists to use a professional entity form. California, for example, does not authorize PLLCs for dentists and requires a professional corporation (PC) instead. Texas, New York, and Florida all permit PLLCs. Before forming an entity, check the dental board regulations in your state, because the IRS will accept any properly formed entity, but the state licensing board may not.

S-corp election. Filing Form 2553 with the IRS elects S-corp treatment for the LLC, PLLC, or PC. The entity’s income is no longer all subject to self-employment tax. Instead, the dentist-owner receives a W-2 salary through payroll (subject to FICA) and takes the remaining profit as shareholder distributions (not subject to FICA). The savings come from the gap between total net income and the salary.

The break-even point for dentists is higher than for most small business owners. Dentists earn significantly more than the average sole proprietor, which means the IRS expects a higher reasonable salary, and that salary must be paid before the S-corp produces any FICA savings. For most dental practices, the S-corp election starts producing meaningful net savings once consistent annual net income before owner compensation exceeds $80,000 to $120,000. Below that range, the costs of running an S-corp (payroll processing, Form 1120-S preparation, state S-corp fees) consume most or all of the FICA savings.

The Form 2553 election must be filed by March 15 of the year it should take effect. For a newly formed entity, the deadline is two months and 15 days after formation. Late elections may be accepted under Rev. Proc. 2013-30 with reasonable cause, but the process is not guaranteed. Missing the deadline costs the dentist a full year of potential FICA savings.

How is reasonable compensation determined for a dentist-owner?

The salary a dentist-owner pays through the S-corp must be “reasonable,” meaning it reflects what a comparable dentist would earn performing the same clinical, managerial, and administrative duties. The IRS scrutinizes dental S-corps closely, and there’s a specific reason why: production-based compensation data for dentists is widely available and easy for an auditor to find.

The American Dental Association publishes annual survey data on dentist compensation. Third-party recruiters, dental staffing firms, and practice management consultants all publish compensation benchmarks. The Bureau of Labor Statistics tracks dentist earnings by metropolitan area. An IRS auditor examining a dental S-corp’s reasonable compensation position has more benchmark data available than in most other industries.

For a general dentist who personally produces $800,000 to $1.2 million in annual collections, the reasonable salary typically falls in the range of $180,000 to $300,000, depending on the geographic market, years of experience, clinical specialty, and production level. The specific number should be supported by multiple data points: what an associate dentist in the same market earns, ADA survey data for the same specialty and region, and production-based benchmarks. Associate dentist compensation commonly runs 25% to 35% of personal collections, which provides a floor for what the owner’s clinical services are worth. On top of that, the owner performs management, business development, and administrative duties that an associate does not, and those duties have their own value.

Setting the salary too low is the most common mistake. A dentist producing $1 million in collections who sets their S-corp salary at $80,000 is effectively claiming that their clinical work, plus practice management, plus business development, is worth what a part-time hygienist earns. That position will not survive an IRS examination. The consequence of being caught: reclassification of distributions as wages, with back FICA taxes, penalties, and interest on the entire reclassified amount, potentially covering multiple tax years.

Setting the salary too high is rare, but it can happen when the dentist doesn’t realize that every dollar above the minimum defensible salary is a dollar paying unnecessary FICA. The goal is a salary that is high enough to be defensible and not a penny higher.

Does the QBI deduction apply to dental practice income?

Dentistry is classified as a health care service, which makes it a specified service trade or business (SSTB) under IRC 199A(d)(2). That classification means the 20% qualified business income deduction phases out at higher income levels and is completely unavailable once taxable income crosses the upper threshold.

For 2026, the phase-in begins at $191,950 for single filers and $383,900 for married filing jointly. The phase-in range is $75,000 (single) and $150,000 (joint), making the complete phase-out $266,950 (single) and $533,900 (joint). These thresholds are adjusted annually for inflation.

For many dental practice owners, this is bad news. A general dentist with $400,000 in taxable income filing single gets no QBI deduction at all. A dentist married filing jointly with $500,000 in combined household taxable income is in the phase-out range, and the deduction is severely limited. The QBI deduction is most valuable to early-career dentists, new practice owners with significant startup debt reducing taxable income, and associate dentists whose income is still in the low-to-mid six figures.

The SSTB classification cannot be avoided through restructuring. Splitting the practice into separate entities, relabeling dental services as something else, or trying to separate the “management” component of the practice from the “clinical” component runs into the anti-abuse rules in Treas. Reg. 1.199A-5(c)(2). The IRS will look through those arrangements.

This matters for the S-corp calculation in a specific way. In non-SSTB businesses (construction, restaurants, retail), the QBI deduction reduces taxable income by 20% of qualified business income, and setting the S-corp salary too low can reduce the W-2 wage base that supports the QBI deduction for higher-income owners. For dentists above the SSTB income threshold, the QBI deduction is zero regardless of how the salary is set, which means the S-corp salary analysis simplifies to a pure FICA optimization. Set the salary at the minimum defensible amount, and take the rest as distributions. There’s no QBI countervailing pressure pushing the salary higher.

For dentists near or below the threshold, the QBI deduction and the S-corp election work together. A dentist filing jointly with $350,000 in taxable income (below the joint threshold) can claim the full 20% QBI deduction on distributions while also saving FICA on those same distributions. The S-corp election doesn’t reduce the QBI deduction in this scenario because it’s below the phase-out and the W-2/UBIA limitation isn’t binding. But that combination only works while income stays below the threshold. Once taxable income rises into the phase-out range, the QBI deduction begins to disappear regardless of entity structure.

How do multi-dentist practices structure ownership?

When two or more dentists own a practice together, the default entity structure is a partnership: an LLC (or PLLC) with multiple members, taxed as a partnership for federal purposes. The entity files Form 1065 and issues a Schedule K-1 to each partner. This is the standard structure for group dental practices, multi-specialty clinics, and any practice with more than one owner.

Partners in a dental partnership are not employees of the partnership. They do not receive W-2s. Compensation flows through two channels: guaranteed payments under IRC 707(c), which function like a fixed salary and are deductible by the partnership, and distributive shares of the remaining income, allocated based on ownership percentage or a production-based formula defined in the partnership agreement.

Production-based formulas are common in dental partnerships because each dentist’s personal production is readily measurable. A typical arrangement might allocate 30% of each dentist’s personal collections as their guaranteed payment (covering the clinical work), with the remaining profit pooled and split by ownership percentage. The exact formula is negotiable and should be documented in the operating agreement.

All ordinary business income allocated to a partner who performs services for the practice is self-employment income under IRC 1402(a). That includes both the guaranteed payment and the distributive share. Self-employment tax applies to the full amount.

The partnership entity can elect S-corp treatment by filing Form 2553. When it does, all partners become shareholder-employees. Each partner receives a W-2 salary, and the remaining profit is distributed as shareholder distributions free of FICA. The S-corp election introduces the salary/distribution split for every partner simultaneously, which means the reasonable compensation analysis must be done for each owner individually.

Multi-dentist partnerships considering the S-corp election should weigh the benefits against the constraints the S-corp rules impose. S-corps are limited to 100 shareholders, can have only one class of stock, and cannot have nonresident alien shareholders under IRC 1361(b)(1). The one-class-of-stock rule is the most likely to create friction, because it means all shareholders must be treated equally per share. A partnership agreement that allocates income based on production formulas (Partner A gets 60% because Partner A produces 60% of revenue) can’t be replicated in an S-corp without running afoul of the single-class requirement. Some practices work around this by using different salaries to approximate the production-based split, but the salary differences must be justifiable under the reasonable compensation standard. If the production-based formula is central to the practice’s compensation model, remaining a partnership may be the better choice, even at the cost of self-employment tax on all income.

How does an associate buy-in work from a tax and entity perspective?

The associate buy-in is one of the most consequential transactions in the lifecycle of a dental practice, and the entity structure determines how every dollar of the purchase price is taxed.

A buy-in can be structured in several ways. The most common are: (1) the associate purchases an ownership interest directly from the existing owner(s), paying personal consideration for a share of the practice, (2) the associate makes a capital contribution to the entity in exchange for new units or shares, diluting the existing owners proportionally, or (3) a combination of both, where part of the payment goes to the existing owners and part goes into the entity.

The purchase price is typically based on a practice valuation. For general dental practices, revenue multiples are the most common valuation method, with the price typically falling between 65% and 85% of annual collections. Specialty practices (oral surgery, orthodontics, endodontics, periodontics) often trade at higher multiples because they tend to have higher margins and more predictable referral streams.

Goodwill is usually the largest component of the purchase price. Patient relationships, the practice’s reputation, referral sources, and the assembled workforce all contribute to the premium a buyer pays above the value of the tangible assets. For tax purposes, goodwill is a Section 197 intangible, amortizable over 15 years by the buyer under IRC 197. For the seller, the gain on goodwill is capital gain, taxed at long-term capital gains rates if the practice has been held for more than one year.

The distinction between personal goodwill and enterprise goodwill matters enormously in dental practices. Personal goodwill belongs to the individual dentist, not to the entity. It’s the value tied to the specific dentist’s patient relationships, reputation, and clinical skill. Enterprise goodwill belongs to the practice itself: the systems, the location, the brand, the staff. In a practice where patients follow the dentist (which describes most dental practices), a significant portion of the total goodwill is personal.

This distinction has a specific tax use. A dentist who owns a C-corp and sells the practice can sell their personal goodwill separately from the corporate assets. The personal goodwill sale is a capital gain to the dentist, avoiding the double taxation that would apply if the goodwill were treated as a corporate asset. For S-corp and partnership owners, the personal-vs-enterprise distinction is less critical for tax purposes because there’s no entity-level tax to avoid, but it still affects the allocation under IRC 1060 and can influence the buyer’s amortization schedule.

What state-specific rules affect dental practice entities?

State law adds a layer of complexity that federal tax analysis alone doesn’t capture. Two areas matter most for dental practices: professional entity requirements and restrictions on non-dentist ownership.

Most states require dentists to operate through a professional entity rather than a general LLC or corporation. The specific forms available vary by state. Texas, Florida, and New York permit PLLCs for dentists. California requires a professional corporation (PC) and does not authorize PLLCs for licensed professionals. In states that mandate a professional entity, forming a general LLC for a dental practice violates state dental board regulations even if the IRS processes the entity’s tax returns without objection.

Restrictions on non-dentist ownership are the second major state-level issue. Many states prohibit or severely restrict non-dentist ownership of dental practices. This matters in two contexts: dental service organization (DSO) arrangements and associate buy-ins that involve non-dentist investors. A DSO is a management company (often backed by private equity) that provides non-clinical services to dental practices: billing, marketing, human resources, equipment procurement, and administrative management. The DSO does not own the clinical practice in states that restrict non-dentist ownership, but it typically enters into a long-term management agreement that gives it economic control. The legality and structure of these arrangements varies by state and is actively litigated and regulated.

For the typical practice owner, the non-dentist ownership restriction means that a spouse, family member, or outside investor generally cannot hold ownership in the professional entity unless they are a licensed dentist. Some states allow limited exceptions (a surviving spouse may retain ownership temporarily after a dentist’s death, for example), but the general rule is restrictive. Entity naming is also regulated: most states require the practice name to include the dentist’s name or a professional designation, and some states prohibit trade names that don’t identify the practitioner.

State entity-level taxes also affect the S-corp analysis. California imposes both an $800 minimum franchise tax on LLCs and PCs and a 1.5% entity-level tax on S-corp net income. A California dental practice S-corp netting $400,000 pays $6,800 in state entity-level taxes ($800 minimum + $6,000 S-corp tax) that wouldn’t exist under a sole proprietorship. Texas imposes its margin tax on entities with revenue above the no-tax-due threshold. New York imposes a fixed-dollar minimum tax on S-corps. These costs reduce the net benefit of the S-corp election but usually don’t eliminate it for a dental practice with meaningful net income.

The pass-through entity tax (PTET) election is available in most states and allows the S-corp or partnership to pay state income tax at the entity level, bypassing the $10,000 SALT deduction cap under IRC 164(b)(6). For dentist-owners in high-tax states (New York, California, New Jersey, Oregon, Minnesota), the PTET election can recover thousands of dollars in otherwise lost federal deductions. The mechanics differ by state, and the election typically must be made early in the tax year.

How does entity structure affect the sale of a dental practice?

The entity structure determines whether the practice is sold as an asset sale or a stock/membership interest sale, and the tax consequences of each are substantially different.

In an asset sale, the buyer acquires the individual assets of the practice: equipment, supplies, patient records (subject to HIPAA requirements), the office lease, the practice name, and goodwill. The purchase price is allocated among these asset classes under IRC 1060 and reported on Form 8594. The seller’s tax treatment depends on the asset class: equipment produces ordinary income to the extent of prior depreciation recapture under IRC 1245, with gain above the original cost taxed as capital gain. Goodwill produces long-term capital gain. The buyer prefers an asset sale because it provides a stepped-up basis in every asset, which means new depreciation schedules on the equipment and 15-year amortization on the goodwill under IRC 197.

In a stock or membership interest sale, the buyer purchases the seller’s ownership in the entity. For the seller, this is a single capital gains transaction: long-term capital gain on the difference between the sale price and the seller’s basis in the stock or membership interest. But the buyer inherits the entity’s existing tax attributes, including the depreciated basis in assets and any built-in liabilities. The buyer gets no stepped-up basis in the underlying assets, which reduces the value of the acquisition from the buyer’s perspective.

For dental practices, the asset sale is far more common. Most practice sales are between a retiring dentist and a younger dentist buying their first practice or expanding. The buyer needs the stepped-up basis to amortize the goodwill (which is typically 60% to 80% of the total price) and depreciate the equipment. The seller typically accepts the asset sale structure because the gain on goodwill is capital gain either way.

The personal goodwill strategy is especially important for dental practices organized as C-corps. Because so much of a dental practice’s value is tied to the individual dentist’s patient relationships and clinical reputation, a significant portion of the total goodwill can be classified as personal goodwill belonging to the dentist rather than to the corporate entity. When the dentist sells their personal goodwill directly to the buyer (outside the corporation), the payment is capital gain to the dentist and avoids the corporate-level tax that would apply if the goodwill were a corporate asset. The IRS has challenged aggressive personal goodwill claims, but the case law supports the concept when the facts are genuine: the patients follow the dentist, the dentist has no non-compete with the entity, and the referral relationships are personal to the dentist. For S-corp and partnership sellers, the personal goodwill strategy is less critical because there’s no entity-level tax, but it can still affect the IRC 1060 allocation and the buyer’s amortization calculations.

Planning for the eventual sale should start well before the sale itself. A dentist who plans to sell in five to seven years should ensure the entity structure supports a clean transaction: current corporate records, updated operating agreement (for partnerships), clear title to assets, and documented personal goodwill. Buyers and their advisors will conduct due diligence, and structural issues discovered during that process either delay the closing or reduce the purchase price.

What should I do next?

Start with the entity form your state allows and the number of owners the practice has. If you’re a solo practitioner, the default is a PLLC (or PC in states that don’t authorize PLLCs for dentists) with an S-corp election once net income consistently exceeds $80,000 to $120,000. If you’re bringing in a partner, the partnership structure offers flexibility that the S-corp’s one-class-of-stock rule does not, and the buy-in should be planned with both the purchase price allocation and the ongoing compensation formula in mind. If you’re planning to sell in the next several years, verify that the entity supports the transaction form your buyer will expect.

Related guides that cover the deductions and planning strategies that flow through whatever entity you choose:

• Dental practice tax deductions for equipment, supplies, and CE, the deductions that flow through the entity once it’s in place
• Franchise entity structure, the parallel entity analysis for franchise businesses, including multi-unit holding company structures
• Law firm entity structure, the parallel entity analysis for another professional practice, with a deep dive on partner transitions
• Restaurant entity structure, the parallel analysis for restaurants, with reasonable compensation benchmarks specific to that industry
• Construction entity structure and QBI, the parallel analysis for a non-SSTB industry where the QBI deduction is fully available at all income levels
• Dental practice valuation and sale, the IRC 1060 allocation, personal vs enterprise goodwill distinction, and the tax treatment on both sides of the transaction when the practice eventually sells
• Dental associate compensation and buy-in, the associate pay structures, production-based formulas, and buy-in mechanics that determine how a new partner enters the entity

This guide is general information, not tax advice for your specific situation. Which points apply, and how, depends on your facts.