The short answer
A sole proprietorship is generally not a separate legal entity: there's typically no state filing to create one, and the owner and the business are treated as one and the same. An LLC (limited liability company) is a separate legal entity created by filing formation paperwork with a state; a single-member LLC is simply an LLC with one owner, and the IRS by default treats it as a "disregarded entity" for federal income tax purposes. Neither structure is universally "better": which one fits depends on facts specific to the business and the owner's situation.
This article is general information for founders, not legal, tax, or financial advice. Rules, fees, and filing requirements vary by state and change over time. Nothing here creates a professional relationship of any kind. Confirm anything that affects your business with your state's filing office and a qualified attorney or accountant before you act on it.
“LLC vs. sole proprietorship” is one of the most-searched business-structure questions among new founders, closely followed by “what is a single-member LLC,” and the two questions are really the same question, since most new LLCs are formed by one person. Here’s how the two structures generally compare, described neutrally rather than ranked, so the comparison holds up regardless of what state someone is filing in.
The comparison
The table below describes general characteristics of each structure. Requirements vary by state: the Secretary of State filing fees and annual costs by state differ meaningfully, so a state-specific check is part of any real decision.
| Dimension | Sole Proprietorship | LLC (including single-member) |
|---|---|---|
| How it comes into existence | Generally automatic once someone starts doing business activity; no state formation filing | Created by filing formation paperwork (commonly called articles of organization) with a state |
| Legal status | Generally not a separate legal entity from the owner | A separate legal entity under state law, distinct from its owner(s) |
| Cost to start | Typically no state formation fee, though a local business license or DBA filing may apply | A state filing fee applies; amounts vary by state and are set by each Secretary of State |
| Ongoing state filings | Generally none required at the entity level, beyond any local license renewals | Many states require a recurring report (annual or biennial), often with a fee, to keep the LLC in good standing |
| How income is generally reported | Reported on the owner’s personal return, commonly Schedule C of Form 1040 | A single-member LLC is, by IRS default, a disregarded entity also reported on the owner’s Form 1040, unless the owner elects corporate tax treatment |
| Business name | Can generally operate under the owner’s legal name or register a trade name/DBA | Registered with the state as part of formation; a separate DBA can still be filed if the business operates under another name |
| Ownership changes | By definition, one owner; adding an owner generally means forming a different structure | Ownership (membership) can generally change under the terms of an operating agreement, without necessarily dissolving the entity |
How each one comes into existence
A sole proprietorship is generally the default. According to the U.S. Small Business Administration, a person is automatically considered a sole proprietor when doing business activity without registering as any other kind of business: there’s typically no formation document to file. That simplicity is the main reason it’s the most common way new businesses start, particularly for freelancers and single-person service businesses testing an idea.
An LLC works differently. It’s created when someone files formation paperwork, usually called articles of organization or a certificate of formation, with a state’s business filing office, generally the Secretary of State. That filing is what makes the LLC exist as an entity under state law, distinct from the person who formed it. Most states also expect an LLC to have a registered agent, a person or service that can accept legal and state mail on the business’s behalf, and many recommend or require an operating agreement describing how the LLC will be run.
Single-member LLCs: a closer look
A single-member LLC is exactly what it sounds like: an LLC with one owner (called a “member” under LLC terminology) instead of multiple. It’s worth its own section because it’s the structure most solo founders are actually asking about when they search “LLC vs. sole proprietorship”: the real comparison for a one-person business is usually sole proprietorship vs. single-member LLC, not LLC in some abstract multi-owner sense.
A few things generally distinguish a single-member LLC from a plain sole proprietorship:
- It’s a state-registered entity. Formation paperwork is filed with the state, and the LLC is generally treated as legally separate from its owner, a distinction a sole proprietorship does not have.
- Federal tax treatment defaults to “disregarded.” According to the IRS, a single-member LLC is treated as an entity disregarded as separate from its owner for federal income tax purposes, unless the owner files Form 8832 to elect corporate treatment. In practice, that generally means the LLC’s income is reported on the owner’s Form 1040, often on Schedule C, the same form many sole proprietors use.
- It’s still a separate entity for employment and certain excise taxes. The IRS treats a single-member LLC as its own entity for those purposes, and generally requires the LLC to use its own name and EIN for related reporting.
- Naming and banking often look more formal. Many single-member LLC owners open a separate business bank account and operate consistently under the LLC’s registered name, though requirements and practices vary.
Because federal income tax reporting for a disregarded single-member LLC generally mirrors a sole proprietorship’s, the practical differences between the two structures mostly show up at the state level: formation, registered-agent and annual-report requirements, and how state law treats the entity, rather than on the federal income tax return itself.
Ongoing paperwork
A sole proprietorship generally has the least ongoing paperwork at the entity level: no state annual report, because there’s no separate entity to report on. Local licenses, permits, or a DBA renewal may still apply depending on the city and industry.
An LLC typically has more going on after formation. Many states require some form of periodic report to keep the LLC in good standing, annual in some states, biennial in others, and a lapsed filing can affect the entity’s standing with the state. A more detailed walk-through of the typical steps founders take when forming and maintaining an LLC is in the LLC formation checklist; requirements and fees always vary by state, so confirming current amounts with the state filing office is part of that process.
How taxes are generally reported
For a sole proprietor, business income and expenses are generally reported on the owner’s personal Form 1040, commonly using Schedule C, and the owner is generally responsible for self-employment tax on net earnings from the business.
For a single-member LLC, the default federal treatment is the same starting point: income generally flows to the owner’s Form 1040 as a disregarded entity, with self-employment tax generally applying to net self-employment earnings in both cases. As of August 2026, the IRS states the self-employment tax rate is 15.3%, made up of 12.4% for Social Security and 2.9% for Medicare. Either a sole proprietor or a single-member LLC owner can also look into electing S-corporation tax treatment with the IRS, which changes how that self-employment tax generally applies, a decision that depends on the specific numbers involved and is generally made with an accountant.
Multi-member LLCs are taxed differently by default (generally as a partnership), which is part of why this comparison focuses on the single-member case most solo founders are actually weighing against a sole proprietorship.
Business name and ownership changes
Under a sole proprietorship, the owner can generally do business under their own legal name, or file for a trade name (DBA) to use another name: the underlying entity, such as it is, doesn’t change. Because a sole proprietorship has exactly one owner by definition, adding a co-owner generally means the business is no longer a sole proprietorship at all; it would typically become a general partnership or some other structure.
An LLC’s name is registered with the state as part of formation, and a DBA can still be layered on top if the LLC operates under a different public-facing name. Ownership in an LLC is generally more flexible: membership can often change, a new member added, an existing member’s stake transferred, under the terms of an operating agreement, without necessarily requiring the entity to dissolve and reform, though the specifics again depend on state law and the LLC’s own governing documents.
The honest caveat
Neither structure is inherently “better,” and this article isn’t going to pretend otherwise. A sole proprietorship’s appeal is real: no formation filing, no annual report, and the least paperwork of any structure, which is why so many freelancers and side projects start there. An LLC’s appeal is also real: it’s a distinct legal entity under state law, with its own name, its own filing history, and generally more flexibility around bringing in other owners later. Which one fits a given business depends on facts an article can’t know: the industry, the risk involved, the state, whether other owners are coming on board, and what a founder’s own attorney or accountant says about the specific situation. For a broader look at where founders are choosing to form altogether, see the comparison of the best states to form an LLC in 2026.
FAQ
What is the difference between an LLC and a sole proprietorship?
A sole proprietorship is generally not a separate legal entity from its owner and typically requires no state filing to exist. An LLC is a separate legal entity created by filing formation paperwork, such as articles of organization, with a state. The two structures also differ in how income is generally reported and how ownership can change, and the details vary by state.
What is a single-member LLC?
A single-member LLC is a limited liability company with one owner. According to the IRS, a single-member LLC is by default treated as a "disregarded entity" for federal income tax purposes, meaning its activity is generally reported on the owner's personal return, unless the owner files Form 8832 to elect corporate tax treatment.
Does forming an LLC protect my personal assets?
State law generally treats an LLC as a legal entity separate from its owner, which is different from a sole proprietorship. Whether that separation holds up in a specific situation depends on state law, how the business is run, and the facts involved, so this is a question for a licensed attorney familiar with the details rather than a general answer.
How is a single-member LLC taxed?
By default, the IRS treats a single-member LLC as a disregarded entity, so its income is generally reported on the owner's Form 1040, often on Schedule C. The owner is generally still responsible for self-employment tax, currently 15.3% under IRS rules, on net self-employment earnings. An owner can also elect corporate tax treatment by filing IRS Form 8832 or Form 2553.
Do I have to register a sole proprietorship with the state?
According to the U.S. Small Business Administration, a person is generally considered a sole proprietor automatically when doing business activity without registering another structure, so there is typically no formation filing. Depending on the location and business name used, a trade name or DBA registration and local licenses may still apply, and requirements vary by state and city.
Can a sole proprietorship later become an LLC?
Many businesses that start as sole proprietorships later file to form an LLC as the business grows. This generally involves filing formation paperwork with a state and obtaining a new EIN in many cases. The process and paperwork involved vary by state, so confirming the current steps with the state filing office is a typical part of that transition.
This article is general information for founders, not legal, tax, or financial advice. Rules, fees, and filing requirements vary by state and change over time. Nothing here creates a professional relationship of any kind. Confirm anything that affects your business with your state's filing office and a qualified attorney or accountant before you act on it.
Sources, verified August 2026: the IRS pages on single-member LLCs and self-employment tax, and the U.S. Small Business Administration’s guide to choosing a business structure. State-specific filing fees and annual costs are covered in our state-by-state formation comparison and best states to form an LLC in 2026. Fees, forms, and requirements change. Confirm current details with your state’s filing office and a qualified attorney or accountant before you act. Read more about this site on our about page. Last verified: August 2026.