Introduction
"Should I form an LLC or an S-Corp?" I get this question weekly, and my answer is always the same: it depends on factors most PAs haven't considered yet.
Choosing the right business structure for your PA practice is one of those decisions that seems simple on the surface but has implications you'll live with for years. The wrong choice can cost you thousands in unnecessary taxes, leave you exposed to personal liability, or create compliance headaches that consume time you should be spending on patient care.
Here's what I've learned advising PAs through this decision: there's no universally "best" structure. The right choice depends on your state's laws, your expected income, your risk tolerance, and your long-term plans. A single-provider practice in Arizona has different optimal choices than a multi-provider group in California.
What I can do is walk you through each option honestly—the benefits, the drawbacks, and the real-world implications I've seen play out for practice owners. By the end of this guide, you'll understand enough to have an informed conversation with your attorney and accountant (and yes, you need both).
Related: Complete Guide to PA Practice Ownership
Why Business Structure Matters
Your business structure affects three critical areas: liability protection, tax treatment, and operational flexibility. Get this wrong, and you'll feel the consequences.
Liability Protection
Healthcare is a high-liability field. Even excellent providers get sued. Your business structure determines whether a malpractice judgment can reach beyond your practice assets to your personal savings, your home, and your retirement accounts.
I worked with a PA who operated as a sole proprietor for her first two years—no separate business entity at all. She thought her malpractice insurance was sufficient protection. Then she faced a lawsuit that exceeded her policy limits. Because she had no corporate structure, her personal assets were exposed. She ultimately settled, but the experience cost her $80,000 out of pocket and months of stress that could have been avoided with proper entity formation.
Tax Treatment
Different structures are taxed differently, and the differences compound over time. Pass-through entities (LLCs, S-Corps) avoid the double taxation that affects C-Corps. The S-Corp election can save significant self-employment taxes at higher income levels. But each option has trade-offs and compliance requirements.
Operational Flexibility
Some structures are simple to maintain; others require ongoing formalities like board meetings, corporate minutes, and separate documentation. Your tolerance for administrative overhead should factor into your decision.
Sole Proprietorship
Let's start with the simplest option—and explain why I almost never recommend it for PA practices.
What It Is
A sole proprietorship isn't really a business structure at all. If you start seeing patients and collecting payments without forming any other entity, you're operating as a sole proprietor by default. There's no separation between you and your business.
The Appeal
Simplicity. No formation documents, no annual filings, no separate tax returns. You report business income on Schedule C of your personal tax return. Startup cost: essentially zero.
Why I Don't Recommend It
Zero liability protection. Every asset you own is exposed to business liabilities. A judgment against your practice is a judgment against you personally. Your house, your savings, your kids' college funds—all potentially at risk.
Self-employment tax on everything. You'll pay the full 15.3% self-employment tax (Social Security and Medicare) on all net earnings. With a proper structure, you can potentially reduce this burden significantly.
Looks unprofessional. Banks, insurers, and landlords take you more seriously when you operate as a formal business entity. Credentialing can be more complicated without a proper business structure.
When It Might Make Sense
Almost never for an ongoing practice. The only scenario where I'd consider it acceptable is very short-term locum work where you're functioning essentially as an independent contractor with minimal liability exposure and no intention of building a practice.
LLC and PLLC
The Limited Liability Company is the most popular structure for small medical practices, and for good reason. The Professional LLC (PLLC) is a variant required in some states for licensed professionals.
What It Is
An LLC is a business entity that provides liability protection while allowing pass-through taxation. Owners (called "members") aren't personally liable for business debts and obligations, and business income passes through to personal tax returns without corporate-level taxation.
A PLLC is identical in most respects but specifically structured for licensed professionals. Some states require healthcare providers to form PLLCs rather than standard LLCs.
Formation and Maintenance
Forming an LLC requires filing Articles of Organization with your state (typically $50-500 depending on state), creating an Operating Agreement (the document that governs how the LLC operates), and obtaining an EIN from the IRS. Annual requirements vary by state but typically include an annual report and fee.
I tell PAs to budget $500-1,500 for professional LLC formation including attorney review of the Operating Agreement. You can do it cheaper with online services, but for a medical practice, I recommend having an attorney review everything.
Liability Protection
LLCs provide strong liability protection for business obligations—debts, contracts, lease obligations. Your personal assets are generally shielded from these claims.
However, LLCs don't protect you from your own malpractice. If you personally commit negligence, you're personally liable regardless of your business structure. The LLC protects you from your employees' negligence and from general business liabilities, but not from your own clinical errors. This is why malpractice insurance remains essential.
Tax Treatment (Default)
By default, a single-member LLC is taxed as a sole proprietorship (Schedule C) and a multi-member LLC is taxed as a partnership. All net income is subject to self-employment tax.
This is where many PAs stop, not realizing they're leaving money on the table. The LLC structure allows you to elect different tax treatment—most importantly, S-Corp taxation.
When LLC/PLLC Is the Right Choice
An LLC taxed as a sole proprietorship makes sense when you're just starting out and income is modest, your state has simple LLC requirements, or you want to maintain maximum flexibility without corporate formalities.
Related: PA Practice Startup Costs
S-Corporation Election
The S-Corp election is where tax strategy gets interesting. This isn't a separate entity type—it's a tax election that changes how your LLC (or corporation) is taxed.
What It Is
An S-Corporation is a tax classification, not a business structure. You form an LLC or corporation, then file Form 2553 with the IRS to elect S-Corp tax treatment. The entity remains an LLC for legal purposes but is taxed as an S-Corp.
The Self-Employment Tax Advantage
Here's why S-Corp election matters: it can significantly reduce your self-employment tax burden.
In a standard LLC, all net income is subject to self-employment tax (15.3% for Social Security and Medicare). In an S-Corp, you pay yourself a "reasonable salary" which is subject to payroll taxes, but remaining profits distributed as "distributions" are not subject to self-employment tax.
Example: Your practice nets $200,000. As a standard LLC, you pay self-employment tax on all $200,000 (roughly $28,000 in SE tax, though subject to caps). As an S-Corp, you pay yourself a $120,000 salary (subject to payroll taxes of roughly $18,000) and take $80,000 as distributions (no self-employment tax). Potential savings: approximately $10,000 annually.
The exact savings depend on your income level and how you structure compensation. The IRS requires that your salary be "reasonable" for the work you perform—you can't pay yourself $30,000 and take $170,000 in distributions.
When S-Corp Makes Sense
The general rule of thumb: S-Corp election becomes beneficial when your practice consistently nets $80,000-100,000+ annually. Below that threshold, the additional accounting costs and payroll requirements may outweigh the tax savings.
I worked with a PA whose practice netted $180,000 in her second year. She hadn't made the S-Corp election and paid nearly $25,000 in self-employment taxes. After restructuring with S-Corp taxation, her tax burden dropped by about $8,000 annually—ongoing savings that compound year after year.
Additional Requirements
S-Corp election adds complexity: - Payroll requirements: You must run formal payroll, withhold taxes, file quarterly payroll tax returns - Reasonable compensation: The IRS scrutinizes S-Corp salaries; pay yourself too little and you risk audit - Accounting costs: Expect to pay $2,000-5,000 more annually for S-Corp tax preparation and payroll services - Year-end planning: Distributions must be properly timed and documented
How to Elect S-Corp Status
File Form 2553 with the IRS within 75 days of forming your LLC (or by March 15 for existing LLCs wanting the election for the current tax year). The election is generally effective from the beginning of the tax year.
Professional Corporation
Professional Corporations (PCs) or Professional Associations (PAs—confusing, I know) are corporate structures specifically designed for licensed professionals.
What It Is
A Professional Corporation is a corporation whose shareholders must be licensed professionals in the same field. In some states, it's the only corporate form available for medical practices. PCs can elect S-Corp or C-Corp taxation.
Why States Require Them
The Corporate Practice of Medicine doctrine in many states prohibits standard business corporations from practicing medicine. Professional Corporations are the workaround—they're owned by licensed professionals, so they satisfy the requirement that medical practices be controlled by licensed individuals.
Related: Corporate Practice of Medicine Doctrine Explained
PC vs LLC
In states that allow both, LLCs are generally simpler and more flexible. PCs have more formalities: annual shareholder meetings, board of directors, corporate minutes, etc. However, some states only allow PCs for medical practices, making the choice moot.
When PC Is Required
States with strict Corporate Practice of Medicine laws often require PCs. California, for example, requires physicians and PAs to practice through Professional Corporations rather than LLCs. Texas allows PLLCs but has specific requirements. Always verify your state's rules.
Tax Treatment
PCs can elect S-Corp taxation (avoiding double taxation) or operate as C-Corps (subject to corporate tax plus tax on dividends). Most small practices elect S-Corp treatment to maintain pass-through taxation.
Side-by-Side Comparison
| Factor | Sole Prop | LLC (default) | LLC + S-Corp | PC + S-Corp |
|---|---|---|---|---|
| **Liability Protection** | None | Good | Good | Good |
| **Self-Employment Tax** | On all income | On all income | Reduced | Reduced |
| **Formation Cost** | $0 | $500-1,500 | $500-1,500 | $1,000-2,500 |
| **Annual Compliance** | Minimal | Low | Moderate | Higher |
| **Accounting Costs** | Low | Low | Higher | Higher |
| **Best For** | Never (for practices) | New/small practices | Profitable practices | Required states |
My General Recommendations
Just starting out, income under $80K: LLC taxed as sole proprietorship. Keep it simple, minimize costs, reassess as income grows.
Established practice, income $80-150K: LLC with S-Corp election. The tax savings justify the added complexity.
High-income practice, $150K+: Definitely S-Corp election (via LLC or PC depending on state). Consider additional tax planning strategies.
In a strict CPOM state: Professional Corporation with S-Corp election, structured according to state requirements.
State-Specific Requirements
Your state's laws significantly constrain your options. Here's what varies:
Entity Type Restrictions
Some states require specific entity types for medical practices: - California: Professional Corporations required - Texas: PLLC or PC, with specific ownership rules - New York: Professional Corporations or PLLCs - Arizona: Flexible—LLCs, PLLCs, and PCs all permitted
Professional LLC Availability
Not all states offer PLLCs. Where they don't exist, you'll typically need a Professional Corporation for liability protection with a professional practice.
Ownership Restrictions
Many states require that medical practice entities be owned by licensed healthcare providers. This affects multi-owner structures and what happens if you want to bring in non-provider investors or administrators.
Resource: PA State Requirements Database
Get State-Specific Advice
I can't emphasize this enough: consult an attorney familiar with healthcare business formation in your state. The rules are technical and vary significantly. Generic online advice (including this article) can't account for your state's specific requirements.
Tax Implications
Let's go deeper on the tax considerations, since they often drive the structure decision.
Pass-Through Taxation
LLCs (default), S-Corps, and partnerships are "pass-through" entities. The business itself doesn't pay income tax; instead, profits pass through to owners' personal returns. This avoids the "double taxation" problem where C-Corps pay corporate tax and shareholders pay tax again on dividends.
For most PA practices, pass-through taxation is preferable. You want to avoid C-Corp taxation unless you have specific reasons (unlikely for a small practice).
Self-Employment Tax Planning
The biggest tax planning opportunity for profitable practices is reducing self-employment tax through S-Corp election. To recap:
- Standard LLC: 15.3% SE tax on all net income (up to Social Security cap)
- S-Corp: Payroll taxes on salary only; distributions avoid SE tax
The savings are real but require proper execution. Set your salary too low, and you risk IRS scrutiny. Fail to run proper payroll, and you lose the benefit entirely.
Qualified Business Income Deduction
The Section 199A deduction allows many pass-through business owners to deduct up to 20% of qualified business income. Healthcare practices generally qualify, but there are income limitations and complex rules. This deduction can be worth $10,000-40,000+ annually for profitable practices.
Retirement Contributions
Your business structure affects retirement plan options: - Solo 401(k): Available to self-employed individuals including LLC members and S-Corp owner-employees - SEP-IRA: Simple to establish, allows large contributions - Defined benefit plans: Can shelter significant income for high earners
S-Corp structures can actually limit retirement contributions in some scenarios (contributions are based on W-2 salary, not total income), so factor this into your planning.
Work With a CPA
Tax planning for medical practices involves enough complexity that professional guidance pays for itself. Find a CPA experienced with healthcare practices and small business taxation. Expect to pay $2,000-5,000 annually for quality tax planning and preparation.
Making Your Choice
Here's my practical framework for choosing your business structure:
Step 1: Check State Requirements
Before anything else, verify what structures your state allows for PA-owned medical practices. If you're in California, you need a PC. If you're in Arizona, you have more options. Start here.
Related: Can PAs Own Their Own Practice?
Step 2: Assess Your Timeline and Income
Pre-launch or early stage (income under $60K): Form an LLC (or PLLC/PC if required). Don't overcomplicate things. Focus on building the practice.
Growing practice ($60-100K): Start planning for S-Corp election. Talk to a CPA about whether the timing is right.
Established practice ($100K+): S-Corp election almost certainly makes sense. If you haven't made it, do so at the start of your next tax year.
Step 3: Consider Your Risk Profile
More formal structures (PCs, properly maintained LLCs) offer better liability protection but require more ongoing compliance. If you're risk-averse and willing to invest in proper maintenance, choose a more formal structure.
Step 4: Get Professional Help
For initial formation, hire a healthcare attorney to set up your entity correctly. Budget $1,000-2,500. For ongoing tax planning, work with a CPA familiar with medical practices. Budget $2,000-5,000 annually.
The cost of professional advice is trivial compared to the cost of getting this wrong.
Frequently Asked Questions
What's the difference between an LLC and a PLLC?
A PLLC (Professional Limited Liability Company) is an LLC specifically for licensed professionals. Some states require licensed healthcare providers to form PLLCs rather than standard LLCs. Functionally, they operate similarly—the main difference is that PLLC members must hold professional licenses, and the entity is specifically authorized for professional practice.
Can I change my business structure later?
Yes, but it's easier to start correctly. Converting from sole proprietorship to LLC is straightforward. Converting from LLC to S-Corp taxation just requires an IRS election. Converting between entity types (LLC to PC, for example) is more complex and may have tax implications. Plan ahead when possible.
Do I need a business attorney or can I use online services?
For a medical practice, I recommend at least having an attorney review your formation documents, even if you use an online service for basic filing. Medical practices have specific requirements around ownership, scope of practice, and regulatory compliance that generic templates don't address. Budget $500-1,500 for attorney review.
What's the minimum income needed to benefit from S-Corp election?
The general threshold is $80,000-100,000 in net practice income. Below that, the accounting costs and complexity of S-Corp compliance often exceed the tax savings. Above that threshold, savings typically justify the added requirements. Your CPA can run the specific numbers for your situation.
How does business structure affect my malpractice insurance?
Your business structure doesn't directly affect malpractice coverage, but it does affect what happens if a judgment exceeds your policy limits. Proper entity formation protects personal assets from business liabilities. Your malpractice insurer may ask about your business structure, and your policy should be in the entity's name (not just your personal name).
Should I have separate entities for different business activities?
Potentially. Some PA practice owners create separate entities for real estate (owning the building), for the practice itself, and for ancillary services. This can provide additional liability protection and tax planning opportunities. Discuss with your attorney and CPA whether multiple entities make sense for your situation.
Related Articles
Practice Ownership: - Complete Guide to PA Practice Ownership - Can PAs Own Their Own Practice?
Legal & Regulatory: - Corporate Practice of Medicine Doctrine - PA Practice Authority Levels
Getting Started: - PA Practice Startup Costs - PA State Requirements Database
Resources
Written by Robert Byron, PA-C, founder of Elite Medical Marketing. This guide is for educational purposes and does not constitute legal or tax advice. Consult a healthcare attorney and CPA in your state for guidance specific to your situation.
Last updated: January 2026