LLC vs sole proprietorship: which should you choose?

If you run a business on your own and you are trying to decide between forming an LLC and staying a sole proprietor, the first thing to know is that the IRS taxes the two the same way by default, so the choice rests on legal protection, cost, and how your business looks to the people who pay you or lend to you.

A sole proprietorship is what you already have the moment you start selling a product or a service without forming anything else. It costs nothing to start, and it leaves your personal assets exposed to business debts and lawsuits. A single-member LLC is a separate legal entity that you form with your state, it adds a layer of liability protection, it costs a filing fee and usually an annual fee, and for federal income tax it is ignored by default, so you still report your profit on Schedule C and still pay self-employment tax. For most owners the real question is whether that protection and credibility are worth the state fees and paperwork, and the answer is usually yes once you have clients, contracts, employees, equipment, or savings that you would not want a creditor to reach.

A sole proprietorship is a default and an LLC is something you file

You become a sole proprietor automatically when you start doing business on your own without creating any other kind of entity, which means there is no registration, no separate legal existence, and no dividing line between you and the business. The contracts, debts, and legal exposure of the business are yours personally, and the business ends when you stop or when you die.

A limited liability company exists only after you file formation documents, usually called articles of organization, with a state. From that point the company is a legal entity that owns the business's assets and signs its contracts, and you are its member. Many owners assume the LLC is a tax structure, but it is a state law structure, and the IRS has no separate federal tax category for it. A single-member LLC is treated as a disregarded entity unless you elect otherwise, which is why two businesses that look very different legally can look identical on a tax return.

The tax treatment is the same until you choose otherwise

Whether you are a sole proprietor or the only member of an LLC, you report income and expenses on Schedule C attached to your Form 1040, you pay income tax on the net profit whether or not you took the money out, and you pay self-employment tax of 15.3% on 92.35% of that profit. The Social Security part of that tax stops at the 2026 wage base of $184,500, the 2.9% Medicare part has no cap, and an additional 0.9% Medicare tax applies above $200,000 for single filers and $250,000 for joint filers. Both structures also qualify for the qualified business income deduction and both pay estimated taxes during the year, and our guide to how single-member LLCs are taxed walks through the Schedule C and Schedule SE math with a worked example.

What the LLC gives you is a future option that a sole proprietorship does not have. When your profit is high enough, an LLC can elect to be taxed as an S corporation by filing Form 2553, which lets you split your income between a salary and distributions and can reduce self-employment tax. That election is the thing people are usually describing when they say an LLC will cut your tax bill. Forming an LLC does not lower your taxes by itself, and for a business that earns modest profit the S election often costs more in payroll and extra returns than it saves, so it is worth modeling later rather than assuming now.

Liability protection is the main reason to form an LLC, and it has limits

When a sole proprietor is sued or cannot pay a business debt, a creditor with a judgment can generally go after personal assets such as bank accounts, a car, or equity in a home. When an LLC is sued, the claim is against the company, and a creditor generally has to collect from what the company owns rather than from you personally. For a business with real exposure, such as contracting, food service, events, driving, or anything where a customer could be physically injured or lose significant money, that difference is the whole case for forming an LLC.

The protection is narrower than many owners expect. An LLC does not shield you from your own wrongdoing, so a professional who commits malpractice or an owner who causes an accident while working can still be personally liable. It does not help with debts you guaranteed personally, and landlords, banks, and equipment lenders often require a personal guarantee from small business owners, which puts your assets back on the table for those obligations. The IRS can also assess the Trust Fund Recovery Penalty against a responsible person who willfully fails to collect or pay over payroll taxes.

Courts can also set aside an LLC's protection when an owner treats the company as an extension of their personal finances. Paying personal bills from the business account, mixing deposits, or ignoring state filing requirements are the kinds of facts that lead a court to disregard the entity, which is why a separate bank account, an operating agreement, and tidy books are part of the protection rather than optional extras. Courts have drawn the line in both directions. In Martin v. Freeman (Colorado Court of Appeals, 2012), the court affirmed personal liability, over one judge's dissent, for the owner of a single-member LLC whose company sold its only meaningful asset, an airplane, during litigation and sent the proceeds to him, with commingled funds and negligible records. In Bonner v. Brunson (Georgia Court of Appeals, 2003), the court affirmed summary judgment for an owner because a subcontractor's claim for more than $288,000 came with no evidence that he had abused the LLC form or mixed his personal affairs with the company's. Insurance is still necessary alongside an LLC, because the company's assets are exposed to claims even when yours are not. Our guide to separating personal and business expenses covers how to clean up a mixed account before it becomes a problem.

An LLC costs more to maintain than a sole proprietorship

States charge a fee to form an LLC, which runs from well under $100 in some states to several hundred dollars in a few others, and many states charge an annual report fee or a franchise tax on top of it. Kentucky, for example, lists a $40 formation filing and a $15 annual report, California charges $70 to file plus an $800 annual LLC tax and a $20 Statement of Information, and New York charges $200 to file and then requires most LLCs to publish notice in two newspapers for six consecutive weeks and file a $50 Certificate of Publication within 120 days. You also need a registered agent with a physical address in the state who can receive legal papers, which you can do yourself or pay a commercial agent a yearly fee to handle.

If your LLC does business in a state other than the one where it was formed, you may have to register there as a foreign LLC and pay that state's fees as well, and a missed annual report can lead to administrative dissolution, which would remove the protection you formed the LLC to get. A sole proprietorship avoids all of these state formation costs, although you may still need to register a trade name if you operate under something other than your own name, and you will need whatever local business licenses and permits your activity requires, which apply to both structures.

The cost matters most for owners with very little profit, where an $800 annual minimum is a large share of income, and matters least for an owner with meaningful risk, where the annual cost of the LLC is small next to the exposure it covers.

Credibility and banking can matter more than the legal theory

Clients, landlords, and lenders tend to treat an LLC as a more established business than an individual using their own name, and larger customers sometimes require a vendor to be an entity before they will sign a contract. An LLC also makes it natural to keep a business bank account in the company's name with its own employer identification number, which in turn makes the books cleaner and your personal money easier to keep separate from the company's.

A sole proprietor can still open a business bank account, and many banks ask for trade-name paperwork only when the business name does not include the owner's legal last name, so nothing requires a sole proprietor to form an LLC to take payments or issue invoices. The credibility benefit is real in some industries and negligible in others, so it deserves less weight than liability and cost in the decision. If credibility is the reason you are considering an LLC, ask the clients or lenders who matter to you whether they actually require an entity before you pay for one.

When each structure fits

Converting a sole proprietorship to an LLC step by step

Converting is mostly state paperwork, and the order below keeps the business running without gaps.

Choose the state and check the name. For most owners the right state is the one where they live and work, because forming in another state still requires registering in your home state and paying fees in both. Check that the name is available and includes the words or abbreviation your state requires, such as LLC, and if your sole proprietorship operated under a trade name, find out whether your state requires you to cancel or transfer it.

File the articles of organization and appoint a registered agent. The filing creates the LLC, and most states let you file online, but processing times vary, so check your state's current timing rather than assuming a few days.

Write an operating agreement. Even a single-member LLC benefits from one, because banks often ask for it and it helps show that the company is a separate entity from you. A few states require one, and New York requires a written agreement within 90 days of formation.

Sort out the EIN. The IRS says a sole proprietor who forms a single-member LLC can generally keep using their existing EIN or Social Security number, unless the LLC will have employees or owes excise taxes, in which case it needs its own EIN, and a new single-member LLC that elects corporate or S corporation treatment also needs one, although an LLC that already has an EIN does not need a new number just because it later makes that election. A multi-member LLC always needs its own. In practice many banks, payment processors, and clients want the LLC to have its own EIN, so many owners apply for one anyway, and it is free to do directly with the IRS.

Move the business into the LLC's name. Open a bank account in the LLC's name and fund it as an owner contribution, assign contracts and equipment to the LLC (some contracts need the other party's consent to an assignment, and assigning a contract does not release you personally until they agree), retitle vehicles where that makes sense, and update your insurance, licenses, permits, and any sales tax registration. Some licenses and permits are tied to the individual and have to be reissued to the LLC, so check each one rather than assuming they carry over.

Tell the people you work with. Update invoices, your website, and payment processors, and keep the Form W-9 you give clients consistent with the LLC's tax status: for a disregarded single-member LLC the owner's name goes on line 1, the LLC's name on line 2, and the number is your Social Security number or your own EIN, not automatically the LLC's separate EIN.

Understand what changes for tax. Because the LLC is disregarded, the conversion is not a sale and does not create a new tax return, so you continue reporting on Schedule C for the full year. If you have employees, the LLC reports payroll taxes under its own EIN, so talk to your payroll provider before the switch. Beneficial ownership reporting is not a concern for a US-formed LLC, since FinCEN's final rule issued in August 2026 permanently exempts domestic companies from filing a beneficial ownership report.

There is no tax reason to wait until January to convert, but starting the books for the LLC on the first day of a month makes the bookkeeping cleaner.

Where Inkle fits

Once your LLC exists, Inkle's bookkeepers keep the books in the system you already use, and our tax team prepares your Form 1040 with Schedule C and Schedule SE and a state return where one is needed. If your profit reaches the point where an S corporation election makes sense, we can prepare Form 2553 and the payroll and returns that come with it. Inkle handles bookkeeping and tax for owner-operated businesses across the US.

See how it works or book a demo to talk through what your business needs.

Frequently asked questions

Is an LLC the same as a sole proprietorship?

No. A sole proprietorship is an unincorporated business with no legal separation between you and the business, while an LLC is a separate legal entity created under state law. The confusion comes from tax treatment, because a single-member LLC is taxed like a sole proprietorship by default.

Do LLCs pay less tax than sole proprietors?

Not by default. A single-member LLC and a sole proprietorship both report profit on Schedule C and both pay income tax and self-employment tax on it. Tax savings come from electing S corporation treatment later, which is available to an LLC but not to a sole proprietorship that has not formed an entity.

Do I need an LLC to open a business bank account?

No. A sole proprietor can open a business account, typically by bringing identification, an EIN or Social Security number, and trade-name paperwork if the business name does not include your legal name. Many owners still form an LLC for the legal protection and because a company-name account is easier to keep separate from personal money.

Can I use my Social Security number or sole proprietor EIN for my LLC?

Often yes for a single-member LLC, according to IRS guidance, as long as the LLC has no employees, does not owe excise taxes, and has not elected to be taxed as a corporation or S corporation. A multi-member LLC needs its own EIN, and banks and clients frequently ask for one regardless.

How much does it cost to form an LLC?

The state filing fee ranges from well under $100 in some states to several hundred dollars in others, and many states add an annual report fee or franchise tax. Kentucky lists a $40 formation filing and a $15 annual report, while California adds an $800 annual LLC tax and New York requires newspaper publication, so budget for recurring requirements and check your state's current fees before you file.

Does an LLC protect me from every lawsuit?

No. It generally protects your personal assets from the company's debts and claims, but not from your own negligence, from obligations you guaranteed personally, or from claims where a court disregards the LLC because personal and business money were mixed.