A sole proprietorship is an unincorporated business owned and run by one person, with no legal separation between the owner and the business. It’s the simplest business structure in the United States and the default one: if you start earning money from freelancing, consulting, selling goods, or offering services without forming an LLC or corporation, you’re already operating as a sole proprietor. There’s no registration with your state required to create one, no formation fees, and no special paperwork to bring it into existence.
How a Sole Proprietorship Works
The defining feature of a sole proprietorship is that you and the business are legally the same entity. You own all the assets, you’re entitled to all the profits, and you’re personally responsible for every debt and obligation the business takes on. If your business owes $30,000 to a supplier or loses a lawsuit, creditors can come after your personal bank accounts, your car, or your home to collect. This is called unlimited personal liability, and it’s the biggest tradeoff for the simplicity of this structure.
On the upside, you have complete control. There are no partners to consult, no board meetings, no annual filings with your state’s secretary of state, and no operating agreement to draft. You make every decision, keep every dollar of profit, and can open or close the business whenever you choose. Many freelancers, tutors, landscapers, consultants, and small online sellers operate this way for years without ever needing a more complex structure.
Setting Up a Sole Proprietorship
Because a sole proprietorship isn’t a formal legal entity, there’s no state formation process. You simply start doing business. That said, a few practical steps are usually necessary depending on what you’re doing and where you’re doing it.
- Business name registration: If you want to operate under a name other than your own legal name, most local or county governments require you to file a “doing business as” (DBA) registration. This is sometimes called a fictitious name or trade name filing. Fees are typically modest.
- Licenses and permits: Depending on your industry and location, you may need a general business license, a professional license, or specific permits. Check with your city or county clerk’s office.
- Employer Identification Number (EIN): If you plan to hire employees, you need an EIN from the IRS. You can get one for free in minutes through the IRS online application tool. You never have to pay a fee for an EIN, so avoid third-party websites that charge for this service. Even without employees, some sole proprietors get an EIN to avoid giving clients their Social Security number.
- Bank account: A sole proprietorship is the only business structure that doesn’t legally require a separate business checking account. Still, opening one makes bookkeeping far easier and helps you track income and expenses cleanly at tax time.
How Sole Proprietors Pay Taxes
Sole proprietors don’t file a separate business tax return. Instead, you report all business income and expenses on Schedule C, which you attach to your personal Form 1040. Your business profit (revenue minus deductible expenses) flows directly onto your individual return and is taxed at your personal income tax rate. This is called pass-through taxation.
Beyond income tax, you also owe self-employment tax, which covers Social Security and Medicare. You calculate this on Schedule SE. The combined self-employment tax rate is 15.3% on net earnings up to the Social Security wage base, then 2.9% on earnings above that threshold. Half of your self-employment tax is deductible as an adjustment to income, which slightly reduces your overall tax bill.
Because no employer is withholding taxes from your pay, you’re generally expected to make quarterly estimated tax payments using Form 1040-ES. These payments cover both income tax and self-employment tax. If you underpay throughout the year, you could face a penalty when you file your annual return.
Several other IRS forms come into play depending on your situation. Form 8829 lets you claim a deduction for business use of your home. Form 4562 handles depreciation on business equipment and property. If you sell business property, you report it on Form 4797. And if you receive more than $10,000 in cash from a single transaction or related transactions, you’re required to report it on Form 8300.
Deductions Available to Sole Proprietors
One advantage of operating a business, even a simple sole proprietorship, is the ability to deduct ordinary and necessary business expenses. These reduce your taxable profit and, by extension, both your income tax and self-employment tax. Common deductions include office supplies, software subscriptions, advertising, professional development, travel, vehicle use for business purposes, and health insurance premiums if you’re not eligible for coverage through a spouse’s employer.
The home office deduction is available if you use a dedicated space in your home regularly and exclusively for business. You can calculate it using actual expenses (a percentage of your rent or mortgage interest, utilities, and insurance based on the square footage of your office) or a simplified method that allows $5 per square foot up to 300 square feet.
The qualified business income (QBI) deduction, sometimes called the Section 199A deduction, allowed eligible sole proprietors to deduct up to 20% of their qualified business income. However, this deduction was authorized for tax years beginning after December 31, 2017, and ending on or before December 31, 2025. Unless Congress extends or renews it, the deduction is not available for the 2026 tax year and beyond.
Liability and Risk
The lack of liability protection is the most significant downside of a sole proprietorship. Because no legal barrier exists between you and the business, a customer who slips on your property, a client who sues over a contract dispute, or a vendor you can’t pay can all pursue your personal assets. This risk is manageable for some businesses, particularly low-risk service providers with few physical interactions, but it grows as your revenue, client base, or exposure increases.
General liability insurance can help offset some of this risk. Professional liability insurance (sometimes called errors and omissions coverage) is another option for service-based businesses. These policies don’t change your legal structure, but they create a financial buffer between a claim and your personal savings.
When a Sole Proprietorship Makes Sense
This structure works well when you’re testing a business idea, freelancing on the side, or running a small operation where the financial risk is low. The zero startup cost, minimal paperwork, and straightforward tax filing make it the easiest way to get started. Many people operate as sole proprietors for their entire careers without issue.
It becomes less ideal as your business grows, takes on debt, hires employees, or faces meaningful liability exposure. At that point, forming a single-member LLC gives you a separate legal entity that shields your personal assets from business obligations. An LLC requires state registration, a registered agent (a person designated to receive legal notices on behalf of the business), and annual filings in most states, but it’s still taxed the same way as a sole proprietorship by default. Lenders and clients also tend to view LLCs as more credible, which can matter when you’re seeking financing or landing larger contracts.
Converting from a sole proprietorship to an LLC is straightforward in most states and can be done at any time. There’s no requirement to start as one structure and stay there forever. Many business owners begin as sole proprietors and transition once their revenue or risk profile justifies the added formality.