A sole proprietorship is the simplest business structure where you and your business are legally the same entity. An LLC (Limited Liability Company) is a separate legal entity that protects your personal assets from business debts and lawsuits. Choose a sole proprietorship if you are testing a low-risk idea with minimal personal assets at stake. Choose an LLC if your business involves any liability risk, you have personal assets worth protecting, you plan to work with clients under contracts, or you want to appear credible to banks and investors. Most serious small businesses should form an LLC. The protection it provides is worth the modest cost of formation in almost every scenario where your business generates real revenue.
Legal disclaimer
This guide provides general educational information about business structures. It is not legal or tax advice. Business structure laws vary by state. Consult a qualified attorney or accountant before making formation decisions for your specific situation.
Choosing a business structure is one of the first and most consequential decisions you make as a founder. It determines how much of your personal wealth is at risk, how you pay taxes, how credible your business appears to clients and lenders, and how complex your compliance obligations are.
Sole proprietorships make up 86.3% of nonemployer firms and 13% of small employment firms, largely because they are the default when you start doing business without registering a formal entity. Many founders stay as sole proprietors longer than they should, not because it is the right structure for their business but because forming an LLC feels complicated. This guide makes that decision straightforward.
What a Sole Proprietorship and LLC Actually Are
Sole proprietorship
The critical characteristic is this: there is no legal separation between you and your business. You are the business. If the business is sued, you are sued. If the business owes money, you owe that money personally. Your home, car, bank accounts, and any other personal assets are all legally available to satisfy business debts or judgments.
LLC (Limited Liability Company)
The 5 Key Differences That Matter Most
Liability protection
Most critical differenceSole proprietorship
No separation between personal and business assets. A lawsuit against your business is a lawsuit against you personally. Your home, savings, and personal accounts are all at risk.
LLC
Personal assets are protected from business liabilities in most situations. If the LLC is sued or owes money, your home and personal accounts are generally shielded, as long as you maintain the separation between personal and business finances.
Taxes
Most nuanced differenceSole proprietorship
All income reported on your personal tax return via Schedule C. You pay self-employment tax (both employer and employee portions of Social Security and Medicare) on all net profits.
LLC
By default taxed the same as a sole proprietorship (pass-through). The key advantage: an LLC can elect to be taxed as an S-Corp, which can reduce self-employment taxes significantly once profits are high enough.
How S-Corp taxation works for an LLC
Instead of paying self-employment tax on all profits, you pay yourself a reasonable salary and take remaining profits as distributions. Only the salary portion is subject to self-employment tax, not the distributions. On $100,000 profit: if you pay yourself $60,000 salary and take $40,000 in distributions, you pay self-employment tax only on the $60,000. The tax savings on the $40,000 distribution can exceed $6,000 per year.
Setup and ongoing cost
LLC
Formation costs range from $50 to $500 depending on the state, paid when filing Articles of Organization. Annual fees vary by state. Most states charge $50 to $500 per year in annual report fees.
Credibility with banks and clients
Setup complexity and ongoing requirements
Sole proprietorship
No registration required. No annual reports. No operating agreement. No separate bank account required (though recommended). File Schedule C with your personal taxes annually. The simplest structure to run administratively.
LLC
File Articles of Organization with your state. Write an operating agreement (required in some states, strongly recommended in all). Open a separate business bank account. File annual reports and pay annual fees. More complex but still manageable for most founders without a lawyer.
Full Comparison Table
| Factor | Sole proprietorship | LLC |
|---|---|---|
| Personal liability | Unlimited. All personal assets at risk | Protected in most situations |
| Formation cost | Free or minimal (DBA only) | $50 to $500 state filing fee |
| Annual fees | None in most states | $50 to $800+ depending on state |
| Tax filing | Schedule C on personal return | Schedule C by default; S-Corp option available |
| Self-employment tax | 15.3% on all net profits | Can reduce via S-Corp election |
| Separate bank account | Not required | Required to maintain liability protection |
| Business credit | Difficult to build | Can build business credit separately |
| Investor-friendly | Not preferred by investors | Preferred by most investors and lenders |
| Setup time | Immediate, no paperwork | 1 to 2 weeks in most states |
| Complexity | Minimal | Low to moderate |
How to Decide: Which Structure Is Right for You
The decision comes down to five questions. Answer them honestly and the right structure becomes clear.
1. Do you have personal assets worth protecting?
A home, savings, a car, retirement accounts. If yes, an LLC is almost certainly worth the cost of formation because a single lawsuit as a sole proprietor could put all of those at risk.
2. Does your business involve liability risk?
Any business that provides professional services, handles client data, interacts with the public, manufactures products, employs workers, or signs contracts carries liability risk. If any of these apply, form an LLC. The risk of operating without personal liability protection in these contexts is not theoretical.
3. Are you planning to work with clients on contracts?
Enterprise clients, agencies, and government entities often require vendors to be registered business entities. Operating as a sole proprietor can cost you contracts that would have been available to you as an LLC.
4. Do you need business financing or credit?
If you plan to apply for business loans, business credit cards, or seek investment, an LLC provides dramatically better access. Only 31% of sole proprietor financing applications were approved in recent Federal Reserve data.
5. Are you just testing an idea with minimal risk?
Which structure to choose by situation
Testing a new business idea with no clients yet
Sole proprietorship is fineFreelancer with first paying client on a contract
Form an LLC nowService business with multiple clients and steady revenue
Form an LLC nowPhysical product business with public-facing operations
Form an LLC nowBusiness earning $40,000+ in annual net profit
LLC + consider S-Corp electionLow-risk solo side hustle, minimal personal assets
Sole proprietorship is fine initiallyHow to Form Each Structure
How to start as a sole proprietor
Three optional steps that most sole proprietors should still take: file a DBA (Doing Business As) if you operate under a business name rather than your own name, open a separate business bank account to keep finances clean, and get a business EIN from the IRS (free online at IRS.gov) so you do not have to give clients your Social Security number.
How to form an LLC
Choose a business name
Must include "LLC" or "Limited Liability Company." Check your state's business name database to confirm availability. Verify the domain name is available at the same time.
Choose a registered agent
Every LLC needs a registered agent in the state of formation to receive legal documents. You can serve as your own agent or use a registered agent service ($50 to $300 per year).
File Articles of Organization
File online at your state's Secretary of State website. Most states process this within 1 to 7 business days. Filing fees range from $50 to $500.
Create an operating agreement
Required in some states, strongly recommended in all. Defines ownership structure, management roles, profit distribution, and what happens if members leave. Even for single-member LLCs, an operating agreement strengthens the legal separation between you and the business.
Get an EIN and open a business bank account
Apply for a free EIN at IRS.gov. Open a dedicated business bank account. Mixing personal and business funds pierces the corporate veil and can eliminate your liability protection.
How to Convert from Sole Proprietorship to LLC
If you are currently operating as a sole proprietor and want to transition to an LLC, the process is straightforward but requires a few key steps. You do not need to stop operating your business during the conversion.
Steps to convert
Common mistakes during conversion
The most important rule after forming your LLC. Keep your personal and business finances completely separate. Pay all business expenses from the business account. Pay yourself a salary or owner's draw from the business account, not directly from client payments. Mixing funds pierces the corporate veil and eliminates the liability protection you paid to create. Formation is only half the protection. Discipline in how you operate provides the other half.
Frequently Asked Questions
Want more guides like this?
Browse all free business guides on Groundwork.