Medical Practice Entity Structure: PC, PLLC, S-Corp Election, and State Requirements

A physician generally cannot just form a regular LLC and start billing insurance under it. Most states require a licensed professional to practice medicine through a specific entity type, usually a professional corporation (PC) or a professional limited liability company (PLLC), and a separate legal doctrine called the corporate practice of medicine limits who can own that entity in the first place. Layered on top of that legal requirement is a tax question: once the entity exists, should it be taxed as a sole proprietorship, a partnership, a C-corp, or an S-corp. For most solo and small-group physicians, the answer that saves the most money is a PC or PLLC that elects S-corporation tax treatment, but the mechanics matter and the details vary sharply by state.

What is a PC or PLLC, and why do physicians need one?

A professional corporation and a professional limited liability company are state-law creations, not federal tax categories. States require certain licensed professions, medicine, dentistry, law, accounting, to organize through these special-purpose entities rather than a garden-variety corporation or LLC, specifically because the state wants a mechanism to keep ownership and control in the hands of licensed professionals and to preserve the professional’s personal liability for their own malpractice.

• A PC is organized under a state’s professional corporation statute and is typically taxed, absent an election, as a C-corporation for federal purposes, though it almost always elects S-corp status instead (discussed below).
• A PLLC is organized under a state’s professional LLC statute and is, by default, a disregarded entity (if one owner) or a partnership (if multiple owners) for federal tax purposes, unless it elects corporate or S-corp treatment.
• Both entity types shield the physician from the practice’s general business liabilities (a slip-and-fall in the waiting room, an unpaid equipment lease) but neither shields the physician from their own malpractice. That liability follows the individual regardless of entity choice, which is why every practicing physician still needs malpractice insurance independent of the entity structure.
• Some states (Texas, California, and others) don’t authorize a PLLC at all for physicians and require a PC or a professional association (PA) instead. A handful of states allow a regular LLC to render medical services if it’s member-managed by licensed physicians. There is no substitute for checking the specific state medical board and secretary of state rules before forming anything.

What is the corporate practice of medicine doctrine?

The corporate practice of medicine (CPOM) doctrine is a state common-law or statutory rule holding that only licensed physicians (or, in some states, other licensed professionals) may own an entity that employs physicians to render medical services. The rationale is that a non-physician owner (a lay investor, a hospital, a management company) could pressure a physician employee to prioritize profit over patient care, and CPOM exists to keep clinical judgment insulated from non-clinical ownership.

• States vary widely in how strictly they enforce CPOM. California, Texas, New York, and a number of others apply it strictly: only licensed physicians can hold equity in a professional medical entity. Other states (many in the Southeast and parts of the Midwest) have weaker or no CPOM restrictions, which is part of why private equity roll-ups of physician practices have concentrated in those states.
• Strict-CPOM states typically permit a management services organization (MSO) structure: a non-physician-owned management company (which can take outside investment) contracts with the physician-owned PC to provide administrative services, billing, staffing, real estate, and equipment, for a management fee. The MSO doesn’t own the clinical entity or employ the physicians; it services it under contract. This “friendly PC” model is how most private equity investment in strict-CPOM states is structured, and the fee arrangement between the MSO and the PC has to be arm’s-length or it invites both state regulatory scrutiny and IRS scrutiny on whether the fee is disguised profit-shifting.
• CPOM is a state regulatory question, not a tax question, but it drives entity choice, which then drives the tax analysis. Get the CPOM answer wrong (an unlicensed spouse or business partner listed as a co-owner of the clinical entity, for instance) and the entity’s basic legal validity is at risk, independent of anything on the tax return.

Should the practice elect S-corporation status?

For a solo physician or a small physician-owned group organized as a PC or PLLC, the S-election is usually the single highest-value tax move available, because of how it treats self-employment and payroll tax.

• A sole proprietor or single-member LLC physician pays self-employment tax under IRC 1401 on all net practice income: 15.3% on income up to the Social Security wage base, and 2.9% (plus the 0.9% Additional Medicare Tax above certain thresholds under IRC 3101) above it, with no cap on the Medicare portion.
• An S-corporation shareholder-employee, by contrast, pays payroll tax (FICA, the employer-side equivalent of self-employment tax) only on the wages the corporation pays them. Distributions of the remaining profit are not subject to FICA or self-employment tax at all. IRC 1362 governs the election itself (filed on Form 2553), and IRC 1361 sets the eligibility rules: no more than 100 shareholders, one class of stock, and shareholders limited to individuals, certain trusts, and estates (no corporate or partnership shareholders, and no nonresident alien shareholders).
• The catch, and the IRS’s primary audit target on physician S-corps, is “reasonable compensation.” The shareholder-physician must be paid a W-2 wage that reflects fair market value for the services actually performed, before any profit is taken as a distribution. Courts and the IRS have consistently disallowed the strategy of paying a token salary and calling the rest a distribution; see, for example, the line of cases following Watson v. Commissioner, 668 F.3d 1008 (8th Cir. 2012), where an accountant’s $24,000 salary against $200,000-plus in distributions was recharacterized. Physicians are a higher-scrutiny category precisely because their fair market compensation is well-documented through published salary survey data (MGMA, Sullivan Cotter), which makes an unreasonably low salary easy for the IRS to spot and easy for a CPA to defend against if the number is set correctly in the first place, using the wage-and-distribution mechanics covered in our compensation models guide.

What does “reasonable compensation” mean for a shareholder?

There’s no statutory formula. The IRS and the courts look at what an unrelated employer would pay an unrelated physician to do the same job, in the same specialty, in the same market, working the same hours.

• The most defensible starting point is third-party compensation survey data by specialty and geography, MGMA DataDrive and Sullivan Cotter are the two most commonly cited sources in exam and litigation. A primary care physician’s reasonable wage looks very different from a proceduralist’s (orthopedic surgery, interventional cardiology, dermatology with a heavy cosmetic or Mohs surgery mix), because the survey data itself differs that widely by specialty.
• Part-time or reduced-schedule physicians need a wage adjusted down proportionally, and the practice needs to document the FTE assumption (clinical hours, patient volume, procedure count) that supports the lower number, since a low salary is exactly what an IRS agent screens for first.
• In a multi-shareholder group, each physician-shareholder’s reasonable compensation should reflect that individual’s production, not an even split of total practice profit. A group that pays every shareholder-physician the same flat salary regardless of wildly different RVU production is building in an audit exposure that has nothing to do with the S-election itself and everything to do with how compensation is set.
• Reasonable compensation is reassessed every year, not set once at formation. A practice that grows revenue substantially needs to revisit the wage, since a static salary against rising distributions is the fact pattern that shows up in the case law.

How does entity choice change in multi-provider groups?

Once a practice has multiple physician-owners, the analysis adds a layer: how income is allocated among the owners, and whether the entity is taxed as a partnership or as a corporation (with an S-election) at all.

• Partnership taxation (the default for a multi-member PLLC that doesn’t elect corporate treatment) passes income and loss through to each partner via Schedule K-1, and each partner’s distributive share of ordinary business income from the practice is generally subject to self-employment tax under IRC 1402, because a general partner (or an LLC member who works in the business) doesn’t get the wage-versus-distribution split that an S-corp shareholder gets. This is a meaningful disadvantage relative to the S-corp structure for actively-working physician partners, and it’s the reason many multi-physician groups organize as a PC electing S-status rather than a partnership, specifically to convert what would be full self-employment-taxed partnership income into a wage-and-distribution split.
• Guaranteed payments to partners for services (a fixed draw independent of overall practice profitability) are also subject to self-employment tax under 1402, so a partnership structure doesn’t have an easy workaround for the SE tax exposure the way an S-corp does.
• S-corp taxation for the multi-shareholder group applies the same reasonable-compensation-plus-distribution logic per shareholder, described above, and is generally the more tax-efficient structure once the group is large enough that the extra payroll administration (running actual payroll for each shareholder-physician, filing employment tax returns) is worth the SE tax savings. Most practices find the breakeven is well below six figures of income per owner, and the wage figure this produces also sets the contribution base for retirement plan design.
• Multi-state groups (partners licensed and practicing in more than one state) add a further layer: state-level entity taxes (several states now impose a pass-through entity tax as a workaround to the federal SALT cap), state-level composite returns, and state professional-entity ownership rules that may differ from the state where the practice is headquartered.

What should be done before forming or converting an entity?

Confirm the state’s professional entity requirement and CPOM rule first, since that decision constrains everything downstream, including the purchase price allocation if the entity is being formed to acquire an existing practice, and is a matter of state corporate and medical-board law, not a tax election. Once the legal entity is settled, run the reasonable-compensation math against current specialty survey data before filing the S-election, because the election’s value depends entirely on the gap between the wage and total profit being both real and defensible. And revisit the wage number annually as production and profit change; a structure that was optimized correctly at formation can become an audit liability three years later if nobody updates it.

Related guides:

• Tax deductions for physicians: equipment, CME, and malpractice insurance, what the practice can deduct once the entity is formed
• Physician compensation models: RVU-based, salary plus bonus, and K-1 income, how partner and shareholder pay actually gets structured
• Starting or buying a medical practice: startup costs and purchase price allocation, entity formation in the context of a new or acquired practice
• Employee benefits for medical practices, the benefits question that follows entity and payroll setup
• Retirement plans for physicians: defined benefit, 401(k), and cash balance plans, plan design that depends on W-2 wage from the S-corp

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