What is a Professional Corporation (PC)?

TL;DR: A Professional Corporation (PC) or Professional LLC (PLLC) is a special type of corporate entity designed exclusively for licensed professionals like doctors, lawyers, accountants, and architects. It provides the standard corporate veil to protect personal assets from business debts, but it cannot protect a professional from their own malpractice or professional negligence.

Introduction: The Limits of the Corporate Shield

Imagine you are a highly successful heart surgeon. You form a standard Limited Liability Company (LLC) to run your medical clinic, believing that the LLC will protect your personal assets (your house, your savings) if you get sued.

One day, you make a terrible mistake during surgery and commit medical malpractice. The patient sues you for $5 million. You think, "It's fine, my LLC will protect my personal house."

You are wrong. In every state in the US, a standard corporate veil never protects a person from their own professional negligence or malpractice. Because of this unique rule, states created a specific entity for licensed experts: The Professional Corporation (PC).

Who Must Form a PC?

You cannot form a PC to run a landscaping business or a coffee shop. State laws restrict PCs exclusively to professions that require a state license to practice. The most common include:

Doctors and Dentists
Lawyers
Certified Public Accountants (CPAs)
Architects and Engineers
Veterinarians

Note: In many states, if you are a licensed professional offering your professional services, the state legally forbids you from forming a standard LLC; you are legally required to form a PC or a PLLC.

How Liability Works in a PC

The liability shield in a PC is highly specific and often misunderstood by professionals.

What it DOES Protect Against (General Liability):

The PC acts exactly like a normal corporation for general business debts.

If your receptionist slips on a wet floor and sues the clinic, your personal assets are safe.
If the clinic goes bankrupt and cannot pay its commercial lease, the landlord cannot seize your personal bank account.

What it DOES NOT Protect Against (Malpractice):

The PC will never protect you from your own malpractice. If you, the doctor, botch a surgery, the patient can sue your PC and sue you personally.

The Real Benefit: Shielding from Your Partner's Malpractice

If the PC doesn't protect you from your own malpractice, why bother forming one? The true power of a PC shines when you have partners.

Imagine you and two other doctors form a PC. Dr. Smith commits terrible malpractice. The patient sues Dr. Smith personally and sues the PC. Because you are in a Professional Corporation, the corporate veil protects YOU from Dr. Smith's malpractice. Your personal assets are safe from your partner's professional mistakes. (If you had formed a General Partnership instead, you would be jointly and severally liable for Dr. Smith's error).

Ownership Restrictions

Because the purpose of the entity is to provide licensed professional services, state laws heavily restrict who can own shares in a PC.

In almost all states, 100% of the shareholders (owners) of a PC must be licensed in the same profession.
A businessman cannot buy 50% of a law firm PC. Only licensed attorneys can own shares in a law firm PC.
If a doctor who owns shares in a PC loses their medical license or dies, their shares must be immediately bought back by the PC or transferred to another licensed doctor.

Conclusion

For licensed professionals, the Professional Corporation (or PLLC) is the mandatory vehicle for doing business. It ensures that while you must always carry heavy Malpractice Insurance to cover your own mistakes, you will never lose your personal home because the doctor in the office next door made a fatal error.

引导语：这一概念是理解现代公司治理与法律边界的基石。它不仅定义了企业高管的责任与义务，也为保护投资者利益设立了防线。深入掌握这一规则，有助于在复杂的商业决策中规避致命的合规风险。