The short answer: A sole proprietorship is a business owned and run by one person with no legal separation between the owner and the business. It needs no federal registration, and the profit is reported on Schedule C of the owner’s Form 1040, where it is subject to income tax and 15.3% self-employment tax. It is the simplest and cheapest way to start, but the owner is personally liable for all business debts and claims.
The simplest, most common way to start a business in the US. What it is, how it is taxed, what it protects and what it does not, and how to set one up properly, with worked examples.
Key Takeaways
- Default structure: one owner doing business without forming an entity is automatically a sole proprietor.
- No separation: you keep all the profit and carry all the debts and legal risk personally.
- Taxes: Schedule C for income tax and Schedule SE for 15.3% self-employment tax on 92.35% of net earnings.
- Taxed when earned: profit is taxed whether or not you take it out of the business.
- Estimated payments: usually required quarterly if you expect to owe $1,000 or more.
- Next step up: a single-member LLC keeps the same default taxes but adds liability protection.
If you have started doing business on your own, whether freelancing, consulting, selling online or taking on clients, there is a good chance you are already a sole proprietor. Most people do not run into trouble with the idea. They run into trouble with the details: assuming the business is separate from them when it is not, missing a local license, or being caught out by self-employment tax.
What Is a Sole Proprietorship?
A sole proprietorship is an unincorporated business owned and run by one person, where the law draws no line between the business and the owner. There is no separate legal entity: you and the business are the same, legally and financially. That one fact explains almost everything else. The owner keeps all the profit, but also carries all the debts, losses and legal responsibility personally.
Because there is no federal registration step to become a sole proprietor, it is the default structure. The moment you start doing business by yourself without forming anything else, you are operating as one.
Quick example: Peter starts designing logos for clients in the evenings and is paid directly into his personal account. He has not filed any formation paperwork. By default, Peter is a sole proprietor, and his design income is simply his income.
Owner vs. Sole Proprietor: The Difference
The two terms are often used interchangeably, but they are not the same. An owner is any person or legal entity that owns a business; a corporation, for example, can own several other companies. A sole proprietor is narrower: the single individual who owns and runs a business operating as a sole proprietorship. Every sole proprietor is an owner, but not every owner is a sole proprietor.
How to Start a Sole Proprietorship, Step by Step
No formal filing is needed to create a sole proprietorship, but a few practical steps keep you compliant and make the business easier to run.
1. Start Doing Business
If you are the only owner and you begin offering goods or services, you are a sole proprietor automatically. Nothing needs to be filed at the federal, state or local level just to have that status.
2. Check Local Licenses and Permits
Depending on where you operate and what you do, you may need a general business license, a home-occupation permit or an industry-specific license. In some places you cannot legally open until the right license is in hand. Your city or county clerk’s office is the best first call.
Example: Ryan opens a small home bakery selling to the public. The structure costs him nothing, but his county requires a food-handling permit and a home-occupation permit before he can sell a single loaf.
3. Register a DBA If You Use a Business Name
If you trade under any name other than your own legal name, most states or counties require you to register a DBA (“doing business as”), also called a fictitious or assumed name. It tells the public who is behind the business name. A DBA does not create a separate entity or give liability protection.
Example: if Peter wants to invoice as “Bright Pixel Studio”, he files a DBA for that name. He can then open a bank account and sign contracts under the studio name.
4. Get an EIN If You Need One
An EIN (Employer Identification Number) is a federal tax ID for a business. A sole proprietor needs one to hire employees, to set up a Keogh or solo 401(k) plan, or to file certain excise tax returns. Otherwise the IRS lets you use your Social Security number. An EIN is free from the IRS online application, and many sole proprietors get one anyway to keep their SSN off invoices and forms.
5. Separate Your Finances
The law does not require a separate bank account, but using one makes bookkeeping and tax preparation far easier and gives you clean records if the IRS asks questions. If you sell taxable goods, register for state sales tax as well.
How Sole Proprietors Are Taxed
This is where “you and the business are the same” becomes very real. A sole proprietorship is a pass-through: the business pays no separate federal income tax. The profit flows onto your personal return and is taxed as ordinary income, whether or not you took the money out.
Two forms do most of the work, both filed with your Form 1040:
- Schedule C reports business income and expenses and arrives at net profit or loss.
- Schedule SE calculates self-employment tax: 15.3% (12.4% Social Security up to the annual wage base plus 2.9% Medicare) on 92.35% of net earnings. It covers both the “employer” and “employee” shares of FICA, since no one withholds it for you.
Worked Example: $90,000 of Consulting Revenue
| Item | Amount |
|---|---|
| Revenue | $90,000 |
| Less deductible business expenses | ($20,000) |
| Net profit (Schedule C) | $70,000 |
| Earnings subject to SE tax ($70,000 × 92.35%) | $64,645 |
| Self-employment tax at 15.3% (Schedule SE) | About $9,891 |
| Deduction for half of SE tax on Form 1040 | About $4,945 |
| Income tax | On the $70,000 at your ordinary rates, after the SE tax deduction and any QBI deduction. |
You may also be able to deduct up to 20% of your qualified business income under section 199A, which the 2025 tax law made permanent, subject to income limits for some service businesses.
The key trap: even if you leave most of the $70,000 in the business account to reinvest, you are taxed on all of it. Profit is taxed when earned, not when withdrawn.
Estimated Quarterly Payments
Because no employer withholds tax for you, the IRS generally expects quarterly estimated payments if you will owe $1,000 or more for the year. They are due around April 15, June 15, September 15 and January 15. Skipping them can bring an underpayment penalty even if you pay in full when you file. Countsure’s personal tax team can work out the amounts.
Advantages of a Sole Proprietorship
For many people starting out, the simplicity is the point.
- Easy and cheap to set up: little or no formation paperwork and minimal cost.
- Simple taxes: no separate federal business return; profit goes on your own 1040 through Schedule C and Schedule SE.
- Low maintenance: no annual state entity report to keep the business alive, though local licenses may need renewing and some cities levy their own business taxes.
- Total control: no partners or board; you make every decision and keep every dollar of profit.
Disadvantages of a Sole Proprietorship
The same simplicity creates the biggest risks.
Unlimited Personal Liability
This is the big one. Because there is no legal separation, you are personally responsible for all business debts and obligations. If the business cannot pay, creditors can pursue your personal savings, car and potentially your home. It works both ways: your personal creditors can reach business assets too.
Example: a customer slips at your shop, is injured and sues. If the claim is more than the business can pay, your personal assets are exposed. Forming an LLC or corporation, and carrying liability insurance, are the usual ways to manage this risk.
Harder to Raise Money
You cannot sell ownership in a sole proprietorship, which makes outside investment difficult. Banks can be cautious too, since repayment depends entirely on one person.
Limited Continuity
A sole proprietorship is tied to its owner. It generally ends when the owner dies or stops running it, while an LLC or corporation can continue and be transferred.
Everything Falls on You
There are no partners to share the work, the risk or the capital, and no employer-provided benefits. You arrange your own health insurance and retirement plan, and the business depends on your own time and health.
Self-Employment Tax on All Profit
There are no partners to share the work, the risk or the capital, and no employer-provided benefits. You arrange your own health insurance and retirement plan, and the business depends on your own time and health.
Thinking about forming an LLC?
Countsure helps founders register a US company and set up the books and tax filings to match.
Sole Proprietorship vs. LLC vs. Corporation
Start with the needs of your business, not the label. If you are a freelancer finding your first clients, a sole proprietorship is an easy, low-cost start. If you expect fast growth, outside funding or real liability exposure, an LLC or corporation is usually a better fit. See our single-member LLC guide for the most common next step.
| Consideration | Sole proprietorship | LLC | Corporation |
|---|---|---|---|
| Setup | No filing; the default for one owner | State filing (articles of organization) | State filing (articles of incorporation) |
| Personal liability | Unlimited; you and the business are one | Generally limited to what you put in | Generally limited to what you put in |
| Federal tax by default | Schedule C on your Form 1040 | Same as a sole proprietorship (Schedule C) for a single-member LLC; can elect S or C corporation tax | Separate corporate return (Form 1120 or 1120-S) |
| Self-employment tax | On all net profit | On all net profit unless an S corporation election is made | Owner-employees pay FICA on salary only |
| Ongoing state requirements | Usually none beyond local licenses | Annual report and fee in most states | Annual report, bylaws, minutes, fees |
| Raising money | Cannot sell ownership | Can add members | Can issue stock |
| Continuity | Ends with the owner | Can continue under its operating agreement | Continues independently of the owners |
Frequently Asked Questions
1. What is a sole proprietorship?
A sole proprietorship is an unincorporated business owned and run by one person, with no legal separation between the owner and the business. It is the default structure: if you start doing business on your own without forming an entity, you are a sole proprietor.
2. Do I have to register to become a sole proprietor?
No federal registration is needed. You may still need local licenses or permits, a DBA if you use a business name other than your own, and state sales tax registration if you sell taxable goods.
3. How is a sole proprietorship taxed?
It is a pass-through. You report the business profit on Schedule C of your Form 1040 and pay income tax on it at your personal rates, plus 15.3% self-employment tax on 92.35% of net earnings, calculated on Schedule SE. You are taxed on the full profit whether or not you withdraw it.
4. Do sole proprietors have to pay estimated taxes?
Usually yes. If you expect to owe $1,000 or more for the year, the IRS expects quarterly estimated payments, generally due April 15, June 15, September 15 and January 15. Missing them can mean an underpayment penalty even if you pay in full with your return.
5. Does a sole proprietorship protect my personal assets?
No. You are personally liable for the business’s debts and legal claims. An LLC or corporation separates business liabilities from your personal assets, and liability insurance helps in either case.
6. Do I need an EIN as a sole proprietor?
Only in certain cases, such as hiring employees, having a Keogh or solo 401(k) plan, or filing excise tax returns. Otherwise you can use your Social Security number, though many sole proprietors get a free EIN to keep their SSN off invoices and forms.
7. Can a married couple run a sole proprietorship together?
A business co-owned by spouses is generally a partnership for tax purposes. Spouses who both materially participate and file a joint return can elect to be a qualified joint venture and each file a Schedule C instead. Different rules apply in community property states.
8. When should I switch from a sole proprietorship to an LLC or corporation?
When liability risk rises, when you want partners or outside investment, or when profits are high enough that an S corporation election could reduce self-employment tax. A single-member LLC keeps the same default tax treatment while adding liability protection.
Choosing or Outgrowing a Structure? Get It Right with a CPA.
A sole proprietorship is a good place to start, but once you take on partners, seek funding or convert to an LLC or corporation, the tax and compliance questions get more involved. Countsure is a CPA-led firm that helps founders choose the right structure, set up clean books and tax filings, and stay compliant as the business grows. Fill out the form below,
Related Countsure Resources
- Single-Member LLC Guide: how a one-owner LLC works, how it is taxed and when it makes sense.
- USA Company Registration: forming an LLC or corporation.
- FICA Tax Explained: the Social Security and Medicare taxes behind self-employment tax.
Parth Shah, Managing Director
(CPA-US, FCA, RV-S&FA, DISA)
Parth Shah who is head of Accounts and Book keeping has experience of more than 10 years. A Certified Public Accountant – US, fellow Chartered Accountant, Registered Valuer and Diploma in Information System Audit.
