Law Firm Business Structure: LLC, PLLC, PC, or Sole Proprietor?

Of all the decisions you make when opening your own shop, the business structure question gets more anxiety than it deserves. You picture choosing wrong, locking yourself into a tax disaster, and unwinding it later at great expense. In practice, this is one of the more reversible choices you'll make, and most solos land in roughly the same place once they understand the trade-offs.

Here's the thing to internalize before anything else: your business entity is mostly about your business liabilities and your tax treatment. It does very little for the risk you actually lose sleep over as a lawyer — getting sued for how you practiced. That distinction shapes the whole decision, and a lot of new attorneys get it backwards.

This post walks through the realistic options for a law practice, what each one does and doesn't protect, how they're generally taxed, and — most importantly — why you can't take any of it as gospel without checking your own state's rules. Treat what follows as a map of the terrain, not directions to your specific destination. The two authorities that actually govern your choice are your state bar and your state's business-filing office, and you should talk to an accountant about the tax side. None of this is legal or tax advice for your situation.

The one thing no structure protects you from

Start here, because it reframes everything else. No business entity shields you, personally, from liability for your own malpractice or negligence as a lawyer.

You can form the most bulletproof professional corporation in your state, follow every formality, and you are still personally on the hook if you blow a statute of limitations, miss a filing deadline, or give negligent advice. That's not a loophole someone forgot to close — it's deliberate. The profession does not let you hide behind a corporate veil for your own professional conduct. Most states make this explicit in the statutes that govern professional entities.

So what does an entity protect? Two real things:

1. Business liabilities unrelated to your legal work — the office lease you signed, a vendor contract, an employee's unrelated tort, a slip-and-fall in your lobby. An entity can keep those from reaching your personal assets.
2. Other owners' malpractice, if you have partners. In a multi-attorney professional entity, one lawyer's negligence generally doesn't make the others personally liable (the negligent lawyer is still personally liable, and the firm's assets are still exposed). For a true solo with no partners, this benefit is largely theoretical.

If you're a solo with no employees, no big lease, and no co-owners, the honest assessment is that the liability protection from your entity is modest. That doesn't make forming one pointless — there are still tax and credibility reasons — but it should lower the stakes in your head.

The realistic options

For a law practice, you're choosing among a short list. Plenty of business structures exist; most aren't available to lawyers, because most states restrict who can own a firm and require professional-entity variants.

Sole proprietorship

This is the default. If you hang a shingle and start practicing without filing anything to create an entity, you're a sole proprietor. There's no separate legal entity — you are the business.

• Liability: None beyond what you'd have anyway. Your personal and business assets are one and the same. There's no veil because there's no entity.
• Taxes: The simplest possible treatment. Business income flows onto your personal return (Schedule C). You pay self-employment tax on the profit.
• Effort: Minimal. You may still need a local business license and, if you use a name other than your own, a "doing business as" (DBA) registration.

The appeal is simplicity and zero formation cost. The downside is no separation between you and the business for non-malpractice liabilities, and a name on the door that some clients read as less established. Many solos start here and formalize within the first year — and that's a perfectly defensible sequence if cash is tight at launch.

Professional LLC (PLLC)

In most states, a law firm that wants LLC-style treatment forms a professional limited liability company, not a plain LLC. Same general machinery as a regular LLC — limited liability for business obligations, flexible tax treatment — but it's a flavor reserved for licensed professionals, and forming one typically requires showing the state that the owners are licensed.

• Liability: Shields personal assets from business debts and (with partners) from co-owners' malpractice. Not from your own malpractice — see above.
• Taxes: By default, a single-member PLLC is a "disregarded entity," taxed just like a sole proprietorship (income on your personal return, self-employment tax on the profit). A multi-member PLLC defaults to partnership taxation. Crucially, an LLC/PLLC can elect to be taxed as an S corporation later — more on that below.
• Effort: You register with the state, adopt an operating agreement, get an EIN, and keep some basic formalities.

For a lot of solos, a single-member PLLC is the sweet spot: business liability separation, a credible entity name, simple default taxation, and a clean path to an S-corp election when income grows.

Professional corporation (PC)

A PC is the corporate-form equivalent for licensed professionals — a corporation that can only be owned by people licensed in the relevant profession. Some states steer or require law firms toward the PC form rather than the PLLC; others allow both.

• Liability: Similar protective scope to the PLLC — business debts and co-owners' malpractice, not your own.
• Taxes: A PC is a corporation. By default that can mean C-corp taxation (the entity pays tax, then you pay again on distributions — the classic double-tax problem), but a PC can elect S-corp status to get pass-through treatment. The mechanics differ from an LLC's, which is exactly the kind of thing to put to your accountant.
• Effort: More corporate formality than a PLLC — bylaws, a board, minutes, the corporate housekeeping.

PCs predate the LLC era and remain common, sometimes because a state's rules favor them for law firms. Where your state gives you a genuine choice between PLLC and PC, the practical differences for a solo often come down to tax mechanics and paperwork burden, which is, again, an accountant conversation.

Plain LLC

A regular, non-professional LLC. Whether a law firm can even use one depends entirely on your state. Some states permit attorneys to organize as a standard LLC; many require the professional variant; a few restrict the options further. Do not assume a plain LLC is on the table just because it's the cheapest, most familiar option for non-lawyer small businesses — for a law practice it frequently isn't.

Why this is unavoidably state-specific

If there's one message to carry out of this post, it's that there is no national answer. Business structure for lawyers is governed at the state level, by two different authorities that don't always speak with one voice:

• Your state bar has rules of professional conduct that constrain how a firm can be organized — who can own it (almost always only licensed attorneys), what the firm can be called, and which entity forms are permitted. Some states publish specific guidance on PLLC versus PC for law firms.
• Your state's business-filing authority (usually the secretary of state) governs the mechanics of forming and maintaining the entity — what you file, the fees, the annual reports.

These vary in ways that matter. Whether you must use a "professional" entity, whether a plain LLC is allowed at all, what the entity name has to include, the formation and annual fees — all of it differs by state. State filing fees are typically modest but vary widely, so check your secretary of state rather than relying on a number you read somewhere. The naming rules tie directly into the naming your law firm decision — some states dictate what a professional entity's official name must contain, which can constrain your branded name.

The tax angle, at a high level

You'll hear seasoned solos talk about "electing S-corp," and it's worth understanding the shape of it without pretending it's a decision you make from a blog post.

By default, a single-member PLLC (or a sole proprietorship) is taxed as pass-through: profit lands on your personal return, and you pay self-employment tax on essentially all of it. Once your net income climbs to a comfortable level, an S-corp election can change the math. The rough idea is that you pay yourself a reasonable salary (subject to payroll taxes) and take the remaining profit as a distribution that isn't hit with self-employment tax. That can save money — but it comes with payroll administration, the requirement that your salary be genuinely reasonable (the IRS scrutinizes this), and accounting costs that eat into the savings at lower income levels.

The point isn't to pick S-corp on day one. It's that the entity you choose now should keep that door open. A PLLC does; a sole proprietorship requires you to form an entity first. This is one more reason the single-member PLLC is a popular starting point — it's a clean default that you can optimize into later.

A note on coordination: how you structure the business intersects with how you price your work, because entity choice affects what you actually keep after taxes. If you're still working out your numbers, how to set your fees and this decision inform each other — model your take-home under each structure, not just your gross.

What you actually do to form one

At a general level — and the specifics will come from your secretary of state — forming a professional entity looks like this:

1. Confirm the permitted form with your state bar and filing authority (the step everyone is tempted to skip).
2. Check name availability and naming rules with the secretary of state, and make sure the official entity name satisfies both the state's professional-entity requirements and your branding.
3. File the formation document — articles of organization for a PLLC, articles of incorporation for a PC — and pay the filing fee.
4. Get an EIN from the IRS. It's free, takes minutes online, and you'll need it for a business bank account, payroll, and most tax filings — even as a single member.
5. Adopt the governing document — an operating agreement for a PLLC, bylaws for a PC. Don't skip this even as a solo; it's part of respecting the entity's separateness.
6. Open a dedicated business bank account (separate from any client trust account, which is its own strictly regulated requirement). Commingling personal and business funds undermines the liability separation you just paid for.
7. Handle ongoing obligations — annual reports, franchise taxes where applicable, and keeping the entity in good standing.

Most of this is administrative and you can do it yourself. The judgment calls — which form, which tax election — are where outside input pays off.

How to actually decide

If you want a default to start from and adjust: most solos open as a single-member PLLC (or their state's required equivalent), keep default pass-through taxation at first, and revisit the S-corp election once income justifies the payroll overhead. You revisit the structure itself when something material changes — you take on a partner, hire employees, or your income jumps a tier.

Don't over-engineer this at the start. The cost of starting simple and formalizing later is low; the cost of analysis paralysis is a launch that keeps slipping. Confirm your state's rules, pick the standard professional entity your state uses, line up malpractice coverage that actually protects you for the work, and get moving. You can refine the tax treatment once you have real revenue to optimize.

For the wider checklist of getting a practice off the ground — and where entity choice fits in the sequence — see how to start your own law firm.