As a licensed professional starting a solo practice, it's important to choose the right business structure. Two options—LLC vs. PC—have advantages and disadvantages in terms of taxation and personal liability protection. Solo practitioners need to know the differences related to professional corporation vs. LLC because your choice can have long-term repercussions for your practice.

Limited Liability Company and Professional Limited Liability Company

A limited liability company (LLC) is a legal entity that combines the limited liability protection of a corporation with the tax benefits of a partnership. All 50 states and the District of Columbia recognize single-owner LLCs. Should your sole proprietorship later want to incorporate as an LLC, under the IRS “check-the-box" regulations you can do so without incurring federal tax consequences.

Certain businesses, such as those in the banking and insurance industries, are prohibited from forming an LLC. While some states allow professionals to form an LLC, others require professionals form a professional limited liability company (PLLC) as set out by state statutes. In a PLLC, the members and managers must be licensed to practice the same profession. In California, licensed professionals are limited to forming a sole proprietorship, general partnership, or professional corporation (PC).

One advantage of an LLC is that each owner—also called a member—has limited liability, which means they are not personally liable for the financial obligations of the LLC. Unlike corporations, LLCs do not have to abide by shareholders' directives or hold annual meetings.

Professional Corporation

A professional corporation, or PC, is one variation of a corporation. Licensed professionals who want to incorporate their practice can form a PC; however, the shareholders, directors, and officers must belong to the same profession. PCs aren't as popular as they once were, in part because of tax law changes and in part because LLCs or PLLCs provide limited liability protection as a PC does and are easier to run.

The list of professions that are required by statute to incorporate as a PC varies by state, so check with your state's corporate filing office—usually the Secretary of State.  The following are often required to form a PC:

• Accountants
• Attorneys
• Engineers
• Medical doctors
• Veterinarians

There are exceptions. Some states give professionals a choice between incorporating as a PC or as a regular corporation. In all states, certain professionals—again, check your state statutes—have the option to form a PC.

There are advantages and disadvantages to a PC. If a professional retires or leaves, ownership is easily transferred to the others, and professionals can share management responsibilities and profits without worrying about being liable for each other's malpractice actions. The flat corporate tax rate, however, could limit corporate growth.

Taxation

There are differences between how a LLC vs. Professional Corporation is taxed. In the single-member LLC, taxes are handled as in a sole proprietorship, and all income passes through the LLC and the owner reports all profits, or losses, as self-employment income on his Schedule C and submits it with his 1040 form when he files his personal taxes.

The PC pays corporation taxes, and this means a sole practitioner gets hit with double taxation. Not only is her income taxed first at the corporation level, but it's taxed again as personal income. She can deduct corporate expenses, including disability insurance, life and health insurance, and payroll taxes.

LLCs are not required to pay state taxes in most states—again, check your state statutes. The owner pays state taxes on their personal tax return. A few states require LLCs to also pay state taxes. In addition, some states impose a fee, often called an annual registration fee, franchise tax, or renewal fee.

Both can file as an S corporation—which is a special type of corporation that is created through an IRS tax election—to avoid double taxation. In an S corp., profits and losses pass through to your personal tax return.

Personal Liability

There are similarities between a PC vs. LLC when it comes to personal liability. Both limit an owner's personal liability for business debts and claims to business assets; creditors cannot come after personal assets. Neither protects you against personal liability for your own malpractice, negligence, malpractice, or personal wrongdoing.

Malpractice protection is often why professionals file as a PC so they are not held financially liable for the wrongdoings of others in the practice. For solo practitioners, however, this advantage doesn't matter, unless they plan to add additional professionals at a later date. In this case, forming as an LLC is often the better choice. In some states, however, single-member LLCs don't have any creditor protection.

It's important to choose the right business structure to protect your business from unforeseen legal and tax consequences. When choosing between an LLC and a PC, check the state statutes to make sure the legal entity can operate in your state. While each shares many similarities, there are also differences between them, so choose the one that meets your needs. If you have any questions, always check with an attorney.

Whether you decide to start an LLC or corporation, LegalZoom can help. Begin by answering a few simple questions. We'll assemble your documents and file them directly with the Secretary of State. You'll receive your completed business formation package by mail.