Sole proprietorships are unincorporated businesses owned by one person, and they cover most freelancers, independent tradespeople, consultants, and small sellers who never filed paperwork to form a company. The category is broad on purpose: if you earn money from a trade or activity on your own without incorporating, the IRS already considers you a sole proprietor.1Internal Revenue Service. Sole Proprietorships Roughly 29.3 million individual tax returns reported sole proprietorship activity in a recent tax year, making it by far the most common business structure in the country.2Internal Revenue Service. SOI Tax Stats — SOI Bulletin: Summer 2024
What Counts as a Sole Proprietorship
A sole proprietorship forms automatically the moment you start earning money from a business activity on your own. There are no articles of incorporation, no state registration fees, and no operating agreements. If you conduct business under your own legal name, you may not need to register with any government agency at all.3U.S. Small Business Administration. Register Your Business
The defining feature is that there is no legal separation between you and the business. You keep all the profits, and you personally carry every debt and every obligation the business takes on. One owner, one taxpayer, one set of assets on the line.
The label applies whether you think of yourself as a business or not. A weekend candle seller, a person who freelances after their day job, and a full-time independent contractor are all sole proprietors in the eyes of the IRS if they haven’t formed an entity. The activity does need to be a trade or business — regular, profit-driven, and ongoing — rather than an occasional hobby.
Freelancers, Consultants, and Professional Services
The freelance economy runs largely on sole proprietorships. Writers, graphic designers, marketing consultants, web developers, and virtual assistants typically operate this way because the value of the work is inseparable from the person doing it. A client hires a specific individual for their portfolio and expertise, not a corporate shell.
Independent bookkeepers, tutors, translators, and social media managers follow the same pattern. So do consultants in fields like HR, IT security, and business strategy. The owner delivers the service, invoices the client, and reports the income on their own return. Incorporation usually becomes a question only after revenue grows or the risk of a claim starts to feel real.
Skilled Trades and Local Service Businesses
Independent house painters, landscapers, handymen, cleaners, plumbers, and electricians are among the most recognizable sole proprietorships. These owners bring their own tools, visit clients directly, and handle the work themselves or with a single helper. Staying unincorporated keeps the paperwork light.
Personal chefs, mobile auto detailers, pet groomers, and caterers who serve private events fit the same mold. The relationship is direct: the client hires someone they trust by name, referrals drive new work, and the operation stays lean by design.
Boutique Retail and Online Sellers
Online marketplaces have made it easy for individuals to run product businesses as sole proprietors. Artisans selling handmade jewelry, clothing, or home décor on Etsy, and resellers who regularly flip items through eBay or Poshmark, generally fall into this category once the activity is consistent and profit-driven.
The same is true on the physical side. Vendors at farmers’ markets and craft fairs selling produce, baked goods, or hand-poured candles are sole proprietors by default. They manage their own inventory, set prices, and keep whatever’s left after expenses.
Online sellers hit one wrinkle worth flagging: state sales tax. Most states require businesses to collect and remit sales tax once they cross an economic nexus threshold, which in a majority of states is $100,000 in sales. Shipping to customers in multiple states can trigger collection duties in each one, a compliance layer that surprises people who thought they were running a simple side operation.
Unlimited Personal Liability
Because you and the business are legally the same, creditors can pursue your personal assets to satisfy business debts. Savings, wages, and potentially your home are exposed if the business defaults on a loan, loses a lawsuit, or can’t pay its bills.4U.S. Small Business Administration. Get Business Insurance
Consider a landscaper whose equipment damages a client’s property, a caterer whose food makes someone sick, or a consultant accused of negligent advice. Each scenario can reach well past the business checking account. Forming an LLC or corporation puts a legal wall between business liabilities and personal assets. A sole proprietorship has no such wall.
Insurance is the main tool sole proprietors have to close that gap. General liability coverage handles bodily injury and property damage claims. Professional liability (also called errors and omissions) protects service providers against malpractice and negligence claims.4U.S. Small Business Administration. Get Business Insurance It doesn’t eliminate personal liability, but it keeps a single bad event from wiping everything out.
How Sole Proprietors Are Taxed
Every dollar of business profit flows onto your personal tax return through Schedule C, where you report income and deduct expenses.1Internal Revenue Service. Sole Proprietorships The net profit gets hit twice: once as regular income tax, and again as self-employment tax. That second tax catches most new sole proprietors off guard.
Self-Employment Tax
If your net earnings from self-employment reach $400 or more for the year, you owe self-employment tax.5Internal Revenue Service. Topic No. 554, Self-Employment Tax The combined rate is 15.3%, covering both the employer and employee halves of Social Security (12.4%) and Medicare (2.9%). A W-2 employee splits this with their employer; a sole proprietor pays both sides. The Social Security portion applies to the first $184,500 of net self-employment income in 2026.6Social Security Administration. Contribution and Benefit Base Medicare has no cap, and an additional 0.9% surtax applies to earnings above $200,000 for single filers.
You can deduct half of your self-employment tax when calculating adjusted gross income, which trims your income tax bill.5Internal Revenue Service. Topic No. 554, Self-Employment Tax That deduction lives on the front of the 1040, not on Schedule C, so it’s easy to miss if you file your own return.
Quarterly Estimated Payments
No employer is withholding tax from your income, so the IRS expects quarterly estimated payments. Missing a deadline triggers an underpayment penalty based on the shortfall and how long it went unpaid. You can generally avoid the penalty if your total balance due is under $1,000, or if you paid at least 90% of the current year’s tax or 100% of the prior year’s tax, whichever is less. If your adjusted gross income exceeded $150,000 the year before, the prior-year safe harbor rises to 110%.7Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
Deductions That Sole Proprietors Rely On
Ordinary and necessary business expenses come off on Schedule C — supplies, equipment, advertising, mileage, professional development. If you use part of your home exclusively and regularly for business, you may qualify for the home office deduction. The simplified method allows $5 per square foot up to 300 square feet, capped at $1,500.8Internal Revenue Service. Simplified Option for Home Office Deduction The regular method tracks actual expenses but demands more records. Either way, the space must be used for business. A kitchen table you also eat dinner at doesn’t qualify.
When You Have to Register or Get an EIN
Operating under your own legal name usually keeps registration requirements to a minimum. If you want to do business under a trade name, most jurisdictions require a “Doing Business As” (DBA) filing with the county or state. Fees are generally modest, but skipping the filing when required can create problems enforcing contracts, because courts in some jurisdictions won’t let you sue under an unregistered trade name. Certain occupations also require professional licenses from local regulatory boards before you can legally offer services, and running a business out of your home may require a home occupation permit under local zoning rules.
Your Social Security number handles tax identification for most sole proprietors. The IRS requires an Employer Identification Number in specific situations:9Internal Revenue Service. Get an Employer Identification Number
- You hire employees and need to withhold payroll taxes.
- You open a solo 401(k) or similar retirement plan.
- Your business owes federal excise taxes.
- You later convert to an LLC or corporation, which requires a new EIN.
Sole proprietors can have employees, contrary to a common assumption. Doing so requires an EIN, payroll tax withholding, quarterly employment tax filings, and in most states, workers’ compensation insurance. Hiring independent contractors avoids most of that, but the IRS scrutinizes the classification: if you direct when, where, and how the work is done, the person is likely an employee regardless of what your contract says.10Internal Revenue Service. Independent Contractor (Self-Employed) or Employee? Misclassification can produce back taxes, penalties, and interest.
When to Consider a Different Structure
A sole proprietorship fits well when you’re starting out, costs are low, and risk is manageable. Several signs point toward forming an LLC or corporation:
- A single lawsuit or accident could realistically threaten your home and savings.
- You’re hiring employees, at which point the administrative simplicity is already gone.
- Profits have grown enough that an S corporation election could reduce self-employment tax by splitting income between salary and distributions. Sole proprietors can’t make that election.
- You want to bring in a partner or investor. A sole proprietorship can only have one owner by definition.
- Clients or contracts you’re pursuing prefer or require a formally organized entity.
Converting doesn’t require starting over. Forming a single-member LLC generally means filing articles of organization with your state, paying a formation fee, and getting a new EIN. The IRS treats a single-member LLC as a sole proprietorship for tax purposes by default, so Schedule C filing continues unless you elect corporate taxation. What changes is the liability shield, and for many owners that protection alone is reason enough to make the switch.