A professional corporation is a state-chartered business entity built for licensed practitioners — physicians, attorneys, accountants, architects, engineers, and other professionals whose work requires a state-issued license. It gives owners the same shield against ordinary business debts that a standard corporation provides, while leaving each practitioner personally on the hook for their own malpractice. In exchange for operating under tighter ownership rules, shareholders get access to corporate tax planning, including the option to elect S-corporation status and sidestep double taxation.
Whether this structure fits your practice depends on who your owners are, how you want to be taxed, and how much paperwork you’re willing to carry. The sections below walk through each piece.
Who Can Form One
State professional corporation statutes limit these entities to people holding an active license from a state regulatory board. Commonly eligible professions include physicians, attorneys, certified public accountants, architects, engineers, dentists, veterinarians, chiropractors, optometrists, psychologists, and licensed clinical social workers. Some states extend eligibility to physical therapists, registered nurses with independent practices, and licensed counselors. The common thread is that the profession must require a state license to practice legally.
Federal tax law uses a parallel but not identical list. Under the Internal Revenue Code, a “qualified personal service corporation” covers health, law, engineering, architecture, accounting, actuarial science, performing arts, and consulting. Financial services are excluded from that federal definition, even though some states allow financial advisors to form professional corporations under state law.
The Single-Profession Rule
Most states require a professional corporation to operate within a single profession. A group of physicians can incorporate together; a physician and an attorney generally cannot share the same entity. A handful of states carve out narrow exceptions for closely allied professions in the healing arts, where a physician and a physical therapist might qualify. If your practice crosses disciplines, check your state’s statute before assuming you can put everyone under one roof.
Ownership and Control
Every shareholder must hold a valid, current license in the profession the corporation practices. Most states extend this requirement to directors as well, which keeps unlicensed investors and outside business entities from steering how the practice delivers care or advice.
If a shareholder loses their license permanently, they must sell or transfer their shares within the divestiture window the statute sets, typically measured in months. When a shareholder dies, the estate generally must transfer the shares to a qualified licensed practitioner or back to the corporation within the statutory timeframe. Failing to complete these transfers can trigger administrative dissolution.
What the Liability Shield Actually Covers
A professional corporation protects individual owners from personal liability for ordinary business debts, just like a standard corporation. If the practice defaults on an office lease, an equipment loan, or a vendor contract signed in the corporate name, creditors cannot reach the owners’ personal assets.
That shield does not extend to professional malpractice. Every practitioner remains personally liable for their own negligence, errors, and omissions while delivering professional services. The corporate form does not change that. Vicarious liability is where this gets less intuitive: if you supervise another employee and that person commits malpractice, you can be held liable for their conduct even if your own work was flawless. Courts have consistently held that appropriate hiring, training, and oversight do not insulate a supervising professional from vicarious liability for a subordinate’s negligence.
Shareholders who are not involved in a particular incident are generally not personally liable for a co-owner’s malpractice. If one partner in a medical group commits an error, the other shareholders’ personal assets are typically protected unless they directly participated in or supervised the care at issue. That split — personal exposure for your own work, corporate protection for everything else — is the whole point of the structure.
Why Malpractice Insurance Is Not Optional
Because the entity cannot shield a practitioner from their own malpractice claims, carrying adequate professional liability insurance is a practical necessity even where state law doesn’t require it. Many states do require professional corporations to maintain malpractice coverage as a condition of keeping the corporate charter active.
One detail trips up departing practitioners. If the practice uses a claims-made policy, a practitioner who leaves needs “tail coverage” (formally, an extended reporting period) to protect against claims filed after departure for services rendered while still at the practice. Without it, no insurer will defend the claim or cover a judgment. Tail coverage can cost several times a full year’s premium, so who pays for it should be settled in the employment or shareholder agreement, not on the way out the door.
How Professional Corporations Are Taxed
By default, a professional corporation is taxed as a C-corporation at the flat 21% federal corporate income tax rate. The corporation pays tax on its profits, and when those profits reach shareholders as dividends, the shareholders pay tax again on their personal returns. This double taxation is the main drawback of the default structure.
Personal Service Corporation Rules
The IRS applies additional scrutiny to C-corporations that qualify as qualified personal service corporations. To fall into this category, substantially all of the corporation’s activities must involve services in health, law, engineering, architecture, accounting, actuarial science, performing arts, or consulting, and substantially all of the stock must be held by employees performing those services (or their estates or heirs within two years of death). Corporations meeting both tests must use a calendar year as their tax year unless they can demonstrate a legitimate business purpose for a different fiscal year. Income deferral to shareholders does not count as a business purpose.
The S-Corporation Election
Most professional corporations that want to avoid double taxation elect S-corporation status by filing Form 2553 with the IRS. An S-corp is a pass-through entity: profits and losses flow to the shareholders’ individual returns, and the corporation itself pays no federal income tax.
To qualify, the corporation cannot have more than 100 shareholders, must have only one class of stock, and every shareholder must be a U.S. citizen or resident individual (certain trusts and estates also qualify). The election must be filed no more than two months and 15 days after the beginning of the tax year it is to take effect, or at any time during the preceding tax year.
There is a catch. The IRS requires S-corporation shareholders who perform services for the corporation to pay themselves a reasonable salary before taking any distributions. Courts have repeatedly upheld this position, treating shareholder-employees as subject to employment taxes on reasonable compensation even when they try to characterize all payments as distributions. Setting your salary artificially low to reduce payroll taxes is one of the fastest ways to attract an audit. The 8th Circuit has held that a corporation’s intent to limit wages is not controlling; the test is whether the payments genuinely reflect fair compensation for services performed.
Professional Corporation vs. PLLC
The main alternative is a professional limited liability company, or PLLC. Both provide the same core benefit: limited liability for business debts, personal liability for your own malpractice. The differences are mostly structural and tax-driven.
- Default taxation. A PLLC defaults to pass-through taxation. A professional corporation defaults to C-corp taxation with its double-taxation problem. Both can elect S-corp status, but the PLLC starts with the simpler default.
- Formalities. Professional corporations require annual shareholder and director meetings, formal corporate minutes, officer appointments, and stock issuance. PLLCs carry significantly lighter administrative requirements.
- Management structure. A professional corporation has shareholders, directors, and officers. A PLLC has members and, optionally, managers — a more flexible setup for practices where all owners are actively delivering services.
- State availability. Not every state offers both options. Some states only allow certain professions to use PLLCs; others only permit professional corporations. Availability varies by profession and jurisdiction.
Larger, more established practices with multiple owners tend to use the professional corporation structure. Solo practitioners and small groups usually prefer the PLLC for its simplicity. Neither is universally better; the right choice turns on your number of owners, your tax plans, and how much administrative overhead you’re willing to carry.
Forming the Corporation
Choosing and Reserving a Name
The name must include a professional designation, most commonly “Professional Corporation,” the abbreviation “P.C.,” “Professional Association,” or “P.A.” Some states also allow “Chartered” or “Chtd.” Most states prohibit using “Incorporated” or “Company” in a professional corporation name. Run an availability search through your Secretary of State’s business database before filing. Most states let you reserve an available name for a limited period, typically 60 to 120 days. Hold off on signage, stationery, and domain purchases until the formation documents are accepted.
Filing the Articles of Incorporation
The foundational document is the Articles of Incorporation or Certificate of Formation, filed with the Secretary of State. It typically requires the corporation’s name, the specific professional service it will provide, the names and license numbers of all initial shareholders and directors, a registered agent authorized to receive legal documents, the number of authorized shares, and the principal office address. The filing must state that the corporation is organized under the state’s professional corporation statute. Filing fees generally fall between $50 and $500.
Getting an EIN
After incorporation, the corporation needs a federal Employer Identification Number from the IRS. Applying online through the IRS website generates the EIN immediately. You can also submit Form SS-4 by fax or mail. Select “personal service corporation” as the entity type. The EIN is required before the corporation can open a bank account, hire employees, or file tax returns.
Drafting Bylaws
Bylaws are the corporation’s internal operating rules. They are not filed with the state, but they govern day-to-day operations. Standard provisions cover meeting locations, notice requirements, voting rights, quorum requirements, officer duties and qualifications, and share transfer procedures. For a professional corporation, the bylaws should also address what happens when a shareholder loses their license, retires, or dies, including the valuation method and timeline for buying back shares. If the bylaws conflict with the articles of incorporation, the articles control.
Keeping the Corporation in Good Standing
Formation is the easy part. Several recurring obligations keep the entity alive.
Annual Reports
Most states require corporations, including professional corporations, to file an annual or biennial report with the Secretary of State confirming the registered agent, principal office address, and the names of current officers, directors, and at least one licensed shareholder. Filing fees generally range from $25 to several hundred dollars. Missing the deadline triggers late penalties, and a prolonged delinquency can lead to administrative dissolution. Losing the corporate charter means losing the liability protection that comes with it, and reinstatement involves penalty fees and extra paperwork.
Meetings and Minutes
Professional corporations must hold annual shareholder and director meetings. The bylaws dictate timing, location, and notice. Every meeting requires formal minutes documenting attendance, quorum, agenda items, and the outcome of any votes. Minutes are not filed anywhere, but they prove the corporation is operating as a genuine entity rather than a shell. Skipping meetings and failing to keep minutes is one of the quickest ways to undermine the liability shield if the entity is ever challenged in court.
License Maintenance
Every shareholder and director must keep their professional license current. If a licensing board suspends or revokes someone’s license, the corporation must begin the divestiture process within the statutory window. Confirm at least annually that all owners remain in good standing with their respective boards; a lapse can jeopardize the entity’s legal status.
Winding Down or Converting
If a professional corporation needs to close, the process generally involves settling tax obligations and filing final returns, preparing a Certificate of Dissolution, and filing it with the Secretary of State along with any required tax clearance. Some states require written consent from the state tax department before the Secretary of State will accept the dissolution. A corporation that simply stops operating without formally dissolving continues to accrue annual report fees, franchise taxes, and penalties.
A professional corporation that wants to change structure rather than shut down can often convert to a PLLC through a statutory conversion or by filing articles of amendment. The specifics vary by state, but the process typically involves filing conversion documents with the Secretary of State, updating the registration with the professional licensing board, and drafting a new operating agreement. Conversion does not affect the licenses of the individual practitioners, but the new entity must still comply with all professional-entity requirements for the profession.