Why the Standard Corporation Advice Doesn’t Apply to You

When a software entrepreneur asks a business attorney how to structure their startup, the conversation usually settles quickly on an LLC or a C-corp, depending on whether venture capital is in the picture. The decision tree is relatively clean. But when a licensed professional — a physician, attorney, CPA, or architect — asks the same question, the answer comes with a different set of constraints entirely.

Most states don’t give licensed professionals the option to simply form a standard LLC or corporation. Instead, they’re directed toward specialized entity structures: the professional corporation (PC) or the professional limited liability company (PLLC). These aren’t cosmetic variations. They exist because state legislatures made a deliberate policy choice: the threat of personal liability should remain a check on professional misconduct, and ownership of a professional practice should stay in the hands of people with the relevant license.

Understanding exactly how a professional corporation and a PLLC differ from their ordinary counterparts — and from each other — is foundational for any licensed professional building a business. Getting this wrong isn’t just an administrative inconvenience; it can void your entity, expose you to personal liability, and create regulatory problems with your licensing board.

The Core Legal Distinction: What Makes an Entity “Professional”

A standard corporation or LLC can be formed by anyone for almost any lawful purpose. A professional corporation or PLLC, by contrast, is purpose-built for a defined set of licensed occupations, and its formation is governed by both general corporate statutes and profession-specific licensing laws.

Ownership Restrictions

This is the most consequential structural difference. In a standard LLC, a private equity firm, a family trust, a foreign investor, or a non-licensed business partner can own a membership interest. In a PLLC or PC, ownership is typically restricted to individuals who hold an active license in the same profession. In many states, all shareholders or members must be licensed in the same field — meaning a physician cannot own shares in a law firm’s PC, and a non-licensed spouse generally cannot inherit an ownership stake without triggering a buyout provision.

Texas, for example, takes a notably strict position: under the Texas Professional Entity Statutes, all owners of a PLLC or PC must be licensed in the profession the entity is organized to practice. California adds another layer — dentists, physicians, and attorneys each operate under separate professional corporation statutes, and cross-ownership between professions is largely prohibited.

Liability Shielding: Partial, Not Total

Here is where many professionals are surprised. A regular LLC typically shields all members from the entity’s debts and obligations — if the business is sued, personal assets are generally protected. A PLLC or PC provides the same protection for business liabilities (a lease default, a vendor contract dispute, an employee’s unrelated negligence), but most state statutes carve out a critical exception: a licensed professional remains personally liable for their own malpractice and, in many states, for the malpractice of those they directly supervise.

This is not a bug — it’s the legislative intent. The rationale is that the doctor-patient or attorney-client relationship carries duties that shouldn’t be insulated by a corporate veil. What the PC or PLLC does accomplish is protecting one professional from the malpractice of a colleague in the same practice. In a general partnership of physicians, every partner could theoretically be personally liable for any partner’s malpractice. A PC structure eliminates that cross-liability between co-owners.

PC vs. PLLC: Choosing Between the Two Structures

Not every state offers both options. Some states recognize only PCs (California notably does not authorize PLLCs for most licensed professions). Others offer both. And a handful of states have created hybrid forms. Where you have a choice, the decision between a PC and a PLLC matters both operationally and for tax planning.

Governance and Formality

A professional corporation is a corporation — it requires a board of directors, officers, annual meetings, minutes, bylaws, and adherence to corporate formalities. Failure to maintain these formalities can result in “piercing the corporate veil,” eliminating the liability protections the structure was meant to provide. For a solo practitioner or a small two-person practice, this administrative overhead can feel disproportionate.

A PLLC, modeled on the LLC structure, operates with a lighter governance framework. Members can run the entity directly (member-managed) or appoint a manager. There’s no mandatory board, no required annual meeting, and the operating agreement can be tailored with significant flexibility. For most small professional practices — a solo attorney, a two-partner CPA firm, a small physical therapy group — the PLLC’s operational simplicity is a genuine advantage.

Taxation Differences

By default, a PC is taxed as a C-corporation, which means it faces the federal corporate tax rate of 21% on profits, and shareholders pay tax again on dividends — the classic double taxation problem. However, a PC can elect S-corporation status if it meets IRS requirements (no more than 100 shareholders, all shareholders must be U.S. citizens or permanent residents, among other criteria). An S-corp election passes income through to shareholders, avoiding double taxation.

A PLLC, like a standard LLC, is a pass-through entity by default. With a single member, it’s disregarded for tax purposes; with multiple members, it’s treated as a partnership. It can also elect S-corp or C-corp treatment. The flexibility here is real — a PLLC can be structured to achieve nearly any tax outcome a PC can, often with less administrative friction.

One important consideration: personal service corporations (PSCs) — a category the IRS applies to many PCs in fields like health, law, accounting, and consulting — are taxed at a flat 21% corporate rate with no graduated brackets. This eliminates one traditional reason to retain earnings inside a C-corp. The IRS defines a PSC under IRS Publication 542, and professionals operating as PCs should review that definition carefully with their tax advisor.

State-by-State Variations That Change the Analysis

There is no uniform federal standard for professional entities. Each state writes its own rules, and the differences are significant enough to affect entity selection directly.

Which Professions Qualify

Every state designates which licensed occupations may or must use a PC or PLLC. The common ones — medicine, law, dentistry, optometry, architecture, engineering, accounting — appear on nearly every state’s list. But the details diverge quickly. New York permits licensed real estate brokers to form PLLCs. Florida’s Professional Service Corporation Act covers a notably broad range including chiropractic medicine and naturopathy. Illinois requires veterinarians to use a PC. Professionals should verify their specific occupation is covered in their state of practice before assuming a PLLC or PC is even available to them.

Multi-State Practices

A physician group licensed in three states faces a compounding problem: each state where they practice may have different requirements. A PLLC formed in Delaware may not be recognized as a valid professional entity in Texas, where the group also sees patients. Foreign qualification (registering an out-of-state entity to do business in another state) typically requires that the entity type be permissible under the host state’s professional entity laws. Multi-state professional practices almost always need state-specific legal counsel rather than a one-size solution.

Practical Formation Steps for a Licensed Professionals Entity

Assuming you’ve confirmed your profession qualifies and your state offers your preferred structure, the formation process follows a recognizable path — with some profession-specific additions.

• Name requirements: Most states require a PC to include “P.C.” or “Professional Corporation” in its name, and a PLLC to include “PLLC” or “Professional Limited Liability Company.” Some states require the entity name to include the name of a licensed owner.
• Certificate of registration from licensing board: Many states require a separate approval from the relevant licensing board before the Secretary of State will accept your formation documents. In New York, for example, attorneys must obtain approval from the Appellate Division before forming a PLLC. This step is frequently overlooked by professionals using generic online incorporation services.
• Articles of organization / incorporation: Filed with the Secretary of State, these must typically state the specific professional service the entity will render — you can’t leave it vague.
• Operating agreement or bylaws: Critical documents that should address ownership transfer restrictions, what happens if a member loses their license, and buyout provisions triggered by death, disability, or license revocation.
• Employer Identification Number (EIN): Required for any entity with employees or that elects a tax classification other than sole proprietorship.
• Malpractice insurance: Not a formation step per se, but many licensing boards condition registration approval on proof of current malpractice coverage. Confirm the requirements with your state board.

The Nolo legal reference library maintains state-specific guides on professional corporation requirements that can serve as a useful starting checklist, though they should complement — not replace — advice from a licensed attorney in your state.

Common Mistakes That Undermine the Structure

The most frequent error is treating a PC or PLLC as a set-and-forget filing. Professionals who form the entity correctly but then ignore it — commingling personal and business funds, failing to maintain licensing board registrations, allowing a non-licensed person to acquire an ownership interest through informal agreements — risk having a court or regulatory body treat the entity as if it never existed.

A second common mistake involves the operating agreement’s license-lapse provisions. If a member of your PLLC loses their license — through disciplinary action, nonrenewal, or moving to a state where their credential doesn’t transfer — most state laws require that their ownership interest be transferred or bought out within a defined period, often 90 days. An operating agreement that doesn’t address this scenario precisely creates disputes at exactly the wrong moment.

Finally, professionals sometimes form a regular LLC first and attempt to convert it later, only to discover that the conversion triggers a new review by the licensing board, potential tax consequences, and — in some states — isn’t permitted at all. Forming the right entity type from the outset is far cleaner than retrofitting.

The Underlying Logic: Accountability Built Into Structure

Professional corporations and PLLCs exist at the intersection of corporate law and professional licensing regulation because the policy goals of those two systems are in tension. Corporate law wants to encourage enterprise and investment by limiting liability. Professional licensing law wants to maintain accountability and protect the public by preserving personal responsibility for professional acts.

The professional entity is the legislative compromise: you get the business protections and operational benefits of incorporation — shielding from business debts, ownership clarity, tax planning flexibility — while retaining personal accountability for the thing that defines you as a professional: the quality and ethics of the services you render.

For a licensed professional building a practice, understanding that bargain isn’t just useful legal knowledge. It’s the foundation of every structural decision you’ll make about how your business is owned, operated, and eventually transferred.