1.1 Sole Proprietorships
SLO 1
Describe the legal and administrative steps required to start a small business (business name registration, EIN, licenses/permits, business bank account), implement a basic recordkeeping system, and compare sole proprietorships, partnerships, LLCs, S-corporations, and C-corporations in terms of liability exposure, tax treatment, and formation/compliance requirements in order to recommend an appropriate entity structure for a given business scenario.
This section builds the first pillar of the entity comparison at the heart of this outcome: the sole proprietorship. You learn the three things you will weigh for every business structure — how it is formed (here, almost automatically, with no state filing), what liability its owner carries (unlimited personal liability, with no wall between business and personal assets), and how its income is taxed (it passes through to your personal return, plus self-employment tax). Because the sole proprietorship is the simplest, lowest-protection baseline, what you learn here becomes the reference point you compare partnerships, LLCs, and corporations against when you later recommend the right structure for a given business.
Learning Objectives
- describe what a sole proprietorship is and how one is formed;
- explain the unlimited personal liability a sole proprietor carries and how it differs from a limited-liability entity;
- explain how a sole proprietor's business income is taxed on the owner's personal return, including self-employment tax and estimated payments.
A sole proprietorship is the most common form of business organization in the United States, and for most people starting a small business it is the default — the structure you end up with automatically if you begin working for yourself and do nothing else. It is any unincorporated business owned entirely by one individual. The single most important idea to hold onto is this: in a sole proprietorship, you and the business are legally the same "person." There is no separate legal entity standing between you and the business's profits, its debts, or its lawsuits.
That identity is the source of both the structure's great advantage and its great danger. Because there is no separate entity to create, a sole proprietorship is the easiest and cheapest structure to form, and it gives the owner complete control — no partners to consult, no board of directors, no shareholders to answer to. But because you and the business are the same, you are personally responsible for everything the business owes, and every dollar the business earns is taxed on your personal return.
A sole proprietorship is an unincorporated business owned entirely by one individual, in which the owner and the business are treated as the same legal person — there is no separate entity standing between the owner and the business's income, debts, and legal obligations.
A sole proprietorship isn't a new "person" the law creates — it's more like a nickname you do business under. The money the business makes and the debts it owes all land in the same wallet: yours. That one fact drives every advantage and every danger below.
You can run almost any kind of business as a sole proprietor, provided you are the only owner and the activity is a genuine business (carried on to make a profit) rather than a hobby or a passive investment. The work can be full-time or part-time — a weekend side business counts. Common examples include a:
- shop or retail trade business,
- home-based business,
- one-person consulting or freelance practice, or
- larger operation that employs staff (a sole proprietorship can have employees; being a "sole" proprietor refers to a single owner, not a single worker).
The three subsections that follow trace the sole proprietorship across the three questions this chapter asks of every entity: How is it formed? What liability does the owner bear? How is its income taxed?
1.1.1 Formation requirements
The sole proprietorship requires the least formal setup of any business structure, and understanding why explains a great deal about the form. Because the business is not a separate legal entity, there is nothing to charter with the state — no articles to file, no fee to bring the entity into existence. In most cases you become a sole proprietor simply by starting to carry on a trade or business by yourself. The law treats you as self-employed from the moment you begin.
What "self-employed" means. For tax purposes, you are a self-employed person if you carry on a trade or business as a sole proprietor or an independent contractor. A trade or business is generally an activity carried on to make a profit. You do not have to actually earn a profit to qualify — but you must have a genuine profit motive and make ongoing efforts to further the business. This distinction matters: an activity pursued mainly for recreation with no real profit motive is a hobby, and hobby losses cannot be deducted the way business losses can. You also do not need to work full-time; a part-time business run alongside a regular job still makes you self-employed for that activity.
Minimal formation, but not zero obligations. Although you do not "file to exist," a sole proprietor operating in California will typically still need to take several administrative steps before opening the doors. These belong to the start-up checklist covered in Chapter 2, but in brief:
- Business name (DBA). If you operate under any name other than your own legal name, you generally must file a Fictitious Business Name Statement (a "doing business as," or DBA) with the county.
- Local licenses and permits. Most California cities and counties require a general business license to operate within their limits.
- Seller's permit. If you sell tangible goods subject to sales tax, you must register for a seller's permit with the California Department of Tax and Fee Administration (CDTFA).
Recordkeeping. Even with minimal formation, every sole proprietor is required to keep sufficient records to comply with federal (and California) tax requirements for business income and expenses. Good records are not just a legal obligation; they are what let you separate business from personal spending, substantiate deductions, and — as later chapters show — actually understand whether the business is making money.
Ongoing compliance is light. Compared with a corporation, a sole proprietorship has very few continuing formalities: there are no annual meetings, minutes, or separate entity tax returns. The main recurring obligations are filing your annual personal income tax return (with the business reported on it) and making estimated tax payments during the year, both covered in §1.1.3.
You start selling handmade candles at weekend markets under the name "Delta Glow Candles," working evenings and Saturdays while keeping your regular day job. You file no paperwork with the state to create a company.
a) Are you a sole proprietor? b) Does working only part-time change your answer? c) The name "Delta Glow Candles" isn't your legal name — what's the one filing that usually applies?
Solution
a) Yes. You became a sole proprietor the moment you began carrying on a trade or business by yourself. Because a sole proprietorship is not a separate legal entity, there is nothing to "file to exist" — starting the activity is the formation.
b) No. Self-employment doesn't require full-time work. A part-time business run alongside a regular job still makes you self-employed for that activity, as long as you have a genuine profit motive (this isn't just a hobby).
c) A Fictitious Business Name Statement (DBA). Because you're operating under a name other than your own legal name, you generally must file a "doing business as" statement with the county. (A local business license may also apply, and a seller's permit if the candles are taxable goods — those come in Chapter 2.)
1.1.2 Liability exposure
The defining risk of the sole proprietorship is unlimited personal liability. Because the business is not a separate legal entity, the owner is personally responsible for every financial obligation and debt the business incurs. There is no legal wall between "business money" and "personal money."
Put in plain terms: if the business borrows money and cannot repay it, the lender can come after your personal assets — your savings, and potentially your home or car. If the business is sued — by a customer, a supplier, or someone injured by the business — you are sued, and a judgment can be collected from your personal property. Crucially, there is no ceiling on this exposure tied to how much you invested.
Unlimited personal liability means the owner is personally responsible for all of the business's debts and legal obligations, with no ceiling tied to the amount invested — creditors and successful plaintiffs may reach the owner's personal assets (savings, home, car) to satisfy business obligations.
Unlimited liability isn't a technicality — it's the risk that one bad lawsuit or unpaid debt reaches your home and savings. Understanding exactly how far that exposure goes is what makes the LLC and corporation in later sections worth their extra cost and paperwork.
This is the opposite of the limited-liability structures you will meet later in the chapter:
- In a corporation or LLC, an owner's loss is generally limited to the amount invested; absent a personal guarantee, creditors cannot reach the owner's personal assets.
- In a sole proprietorship (and, as §1.2 shows, for the general partners in a partnership), the owner's entire personal wealth stands behind the business's debts.
Maria runs a small catering business as a sole proprietor. A client claims that food from an event made guests ill and sues for $150,000 — more than the business is worth. Whose assets are exposed to this claim, and how would forming an LLC or corporation have changed the answer?
Solution
Step 1 — Identify who is actually being sued. Because Maria and her business are legally the same "person," the lawsuit is against Maria herself, not a separate company. There is no entity standing between her and the claim.
Step 2 — Trace where a judgment can be collected. If the claim succeeds and the amount exceeds her business assets and any insurance, the remainder can be collected from her personal property — her savings, and potentially her home or car. The $150,000 exposure is not capped at what she put into the business.
Step 3 — Compare the limited-liability alternative. Had Maria formed an LLC or corporation and observed its formalities, her personal assets would generally have been shielded, and her exposure limited to what she had invested in the business.
Answer: As a sole proprietor, Maria's personal assets are fully exposed to the $150,000 claim. A properly maintained LLC or corporation would generally have capped her loss at her investment in the business.
This exposure is the single most common reason small business owners eventually convert to an LLC or corporation. It is also why sole proprietors should carry appropriate business liability insurance — insurance and entity choice are the two main tools for managing the risk that the business will owe more than it can pay.
Rosa runs a sole proprietorship. Her business owes a supplier $40,000 that it cannot pay, and the business's own assets are worth only $10,000.
a) Can the supplier collect the remaining $30,000 from Rosa, and if so, from where? b) How would the answer change if Rosa's business were a properly maintained LLC and she had signed no personal guarantee?
Solution
a) Yes. In a sole proprietorship there is no wall between business and personal money. The supplier can apply the $10,000 of business assets and then pursue Rosa's personal assets — savings, and potentially other personal property — for the remaining $30,000. The exposure has no ceiling tied to what she invested.
b) Rosa would generally be protected. In a properly maintained LLC, her loss is limited to the amount invested. Absent a personal guarantee, the supplier could reach the business's $10,000 but not Rosa's personal assets for the remaining $30,000. (The "properly maintained" part matters — commingling funds or ignoring formalities can put that protection at risk, as later sections show.)
1.1.3 Pass-through taxation
A sole proprietorship is a pass-through entity, and the phrase means exactly what it says: business income does not stop and get taxed at the business level — it "passes through" to the owner and is taxed on the owner's personal return. The business itself pays no separate income tax. This is the same single layer of taxation you will see for partnerships, most LLCs, and S corporations, and it stands in sharp contrast to the double taxation of a C corporation (§1.5.1).
Under pass-through taxation, the business pays no separate income tax; its net income or loss "passes through" to the owner's personal return, where it is taxed once, at ordinary individual rates. This single layer of tax contrasts with the double taxation of a C corporation.
How it is reported. A sole proprietor generally files Schedule C, Profit or Loss from Business, as part of the personal Form 1040. (Sole-proprietor farmers file Schedule F instead.) The business's net income or loss from Schedule C is combined with the owner's other income and deductions and taxed at ordinary individual rates. If the business loses money, that loss can often offset the owner's other income — one practical advantage of the pass-through form in a start-up year.
Self-employment (SE) tax. Because a sole proprietor is not an employee, no employer is withholding Social Security and Medicare taxes from a paycheck — but those taxes still must be paid. The owner pays them as self-employment tax, computed on Schedule SE. SE tax funds Social Security and Medicare and is assessed on the business's net earnings. Two points ease the sting: the owner may deduct one-half of the SE tax on Form 1040, and SE tax applies to net earnings, not gross receipts.
Self-employment tax is the Social Security and Medicare tax a self-employed person pays on the business's net earnings, computed on Schedule SE — it replaces the payroll taxes an employer would otherwise withhold. The owner may deduct one-half of the SE tax on Form 1040.
Estimated quarterly payments. Employees have income tax withheld from every paycheck; a sole proprietor does not. To keep the federal "pay-as-you-go" system working, a sole proprietor who expects to make a profit generally must make quarterly estimated tax payments using Form 1040-ES. These payments cover both income tax and self-employment tax. As a rule of thumb, estimated payments are generally required when you expect to owe $1,000 or more for the year. Missing or underpaying them can trigger an underpayment penalty (developed further in Chapter 4).
Mai runs a graphic-design sole proprietorship and, after expenses, reports $60,000 of net profit on Schedule C. What taxes does Mai owe on this profit, and how should she have paid them during the year?
Solution
Step 1 — Income tax (one layer). The $60,000 flows onto Mai's Form 1040 and is taxed at Mai's individual rate along with any other income. The business writes no separate check for income tax — that's the pass-through form at work.
Step 2 — Self-employment tax. Because no employer withheld Social Security and Medicare tax, Mai also owes SE tax on the net earnings — illustratively about \(15.3\%\) (the combined Social Security and Medicare rate):
$$ 0.153 \times \$60,000 \approx \$9,180 $$before the one-half deduction and other adjustments.
Step 3 — Estimated payments. Because no one withheld tax during the year, Mai should have sent quarterly Form 1040-ES payments covering both the income tax and the SE tax, rather than facing one large bill — and a possible underpayment penalty — at filing time.
Answer: Mai owes ordinary income tax on the $60,000 and self-employment tax of roughly $9,180 (illustrative), and should have paid both through quarterly estimated payments.
(The \(15.3\%\) rate is illustrative and is applied here to net profit for simplicity; the actual Schedule SE computation applies the rate to \(92.35\%\) of net earnings and caps the Social Security portion at an annual wage base.)
Andre expects about $30,000 of net profit from his sole proprietorship this year and has no taxes withheld by any employer.
a) Which tax form reports his business's profit, and on which personal return does it land? b) What additional tax applies simply because there's no employer — and what schedule computes it? c) What should Andre do during the year to avoid an underpayment penalty?
Solution
a) Schedule C, Profit or Loss from Business, filed as part of Andre's Form 1040. The $30,000 net profit is combined with his other income and taxed at ordinary individual rates. (A farmer would use Schedule F instead.)
b) Self-employment (SE) tax, computed on Schedule SE. Because no employer withheld Social Security and Medicare tax, Andre pays it directly on his business's net earnings. (One-half of it is deductible on Form 1040.)
c) Make quarterly estimated tax payments using Form 1040-ES. These cover both the income tax and the SE tax under the federal "pay-as-you-go" system. Estimated payments are generally required once you expect to owe $1,000 or more for the year; skipping or underpaying them can trigger an underpayment penalty.
The bottom line for choosing an entity. A sole proprietorship offers the simplest possible tax picture — one return, one layer of tax — at the cost of unlimited liability and the full weight of self-employment tax on all business profit. Keep both sides of that trade-off in mind as you compare it against the partnership, LLC, and corporate forms in the sections that follow, and as you practice recommending a structure for a specific business in §1.6.
Problem Set 1.1
Problem 1. In your own words, explain what it means to say that in a sole proprietorship "you and the business are legally the same person." Give one advantage and one danger that follow directly from that fact.
Solution
Step 1 — Unpack the phrase: Saying "you and the business are legally the same person" means the law does not treat the sole proprietorship as a separate entity. There is no company standing between you and the business — its income, its debts, and its lawsuits are legally yours.
Step 2 — One advantage that follows: Because there is no separate entity to create, the business is the easiest and cheapest structure to form (nothing to charter with the state) and you keep complete control — no partners, board, or shareholders to answer to.
Step 3 — One danger that follows: Because you are the business, you carry unlimited personal liability — you are personally responsible for everything the business owes, and its debts and lawsuits can reach your personal savings, home, or car.
Answer: It means the law sees no separation between owner and business. Advantage: simplest, cheapest to form with total control. Danger: unlimited personal liability for the business's debts and lawsuits.
Problem 2. Your friend Kevin says, "I can't be a sole proprietor — I never filed anything with the state." Explain why his reasoning is mistaken.
Solution
Step 1 — Identify the mistaken assumption: Kevin assumes that being a business requires filing paperwork to "create" it, the way you would form a corporation or LLC.
Step 2 — State the correct principle: A sole proprietorship is not a separate legal entity, so there is nothing to file into existence. You become a sole proprietor simply by starting to carry on a trade or business by yourself — the law treats you as self-employed from that moment.
Step 3 — Note the practical caveat: He may still owe other filings (a DBA if he uses a business name, a local business license, a seller's permit for taxable goods), but none of those "create" the business — they are operating requirements, not formation of an entity.
Answer: Kevin is wrong because a sole proprietorship needs no formation filing; starting the activity itself makes him a sole proprietor. The only filings that may apply are operating permits, not entity creation.
Problem 3. Classify each of the following as most likely a business or a hobby for tax purposes, and explain your reasoning:
a) A person who sells handmade jewelry at weekend markets, tracks expenses, and advertises to grow sales.
b) A person who occasionally sells a few paintings they made purely for enjoyment, with no effort to earn a profit.
Solution
Step 1 — Recall the test: For tax purposes, an activity is a trade or business when it is carried on with a genuine profit motive and ongoing effort. An activity done mainly for recreation with no real profit motive is a hobby.
Step 2 — Classify (a): Selling handmade jewelry at weekend markets while tracking expenses and advertising to grow sales shows a clear profit motive and continuous, businesslike effort → most likely a business (even though it's part-time; part-time work still counts).
Step 3 — Classify (b): Occasionally selling a few paintings made purely for enjoyment, with no effort to earn a profit, lacks a profit motive → most likely a hobby (and hobby losses cannot be deducted like business losses).
Answer: (a) Business — profit motive plus ongoing, businesslike effort. (b) Hobby — made for enjoyment with no profit motive.
Problem 4. A sole proprietor's business is sued and loses a $200,000 judgment. The business's assets total $50,000. Explain what the plaintiff can pursue for the remaining $150,000, and identify the one feature of the sole proprietorship that makes this possible.
Solution
Step 1 — Apply the business's assets first: The plaintiff first collects from the business's own assets, which total $50,000, leaving $150,000 of the $200,000 judgment unpaid.
Step 2 — Trace where the rest can come from: Because there is no legal wall between business and personal money, the plaintiff can pursue the owner's personal assets — savings, and potentially the home or car — for the remaining $150,000.
Step 3 — Name the feature that allows it: This is possible because a sole proprietorship carries unlimited personal liability: the owner and the business are the same legal person, so there is no ceiling on the owner's exposure tied to what they invested.
Answer: The plaintiff can pursue the owner's personal assets for the remaining $150,000. The feature that makes this possible is the sole proprietorship's unlimited personal liability (owner and business are legally the same person).
Problem 5. Explain the difference between how a sole proprietorship and a C corporation are taxed. Use the phrases "pass-through" and "double taxation" in your answer.
Solution
Step 1 — Sole proprietorship taxation: A sole proprietorship is a pass-through entity. The business itself pays no separate income tax; its profit passes through to the owner's personal return (Schedule C on Form 1040) and is taxed once, at the owner's individual rates.
Step 2 — C corporation taxation: A C corporation faces double taxation. The corporation first pays corporate income tax on its profit, and then, when that profit is distributed to owners as dividends, the owners pay personal tax on it again — the same earnings are taxed at two levels.
Step 3 — State the contrast: So the key difference is the number of tax layers: one for the sole proprietorship (pass-through), two for the C corporation (double taxation).
Answer: A sole proprietorship's income is taxed once — it passes through to the owner's personal return (pass-through). A C corporation's income is taxed twice — once at the corporate level and again when distributed as dividends (double taxation).
Problem 6. A sole proprietor reports $45,000 of net profit on Schedule C.
a) On which personal tax form is this income reported, and at what rates is it taxed?
b) Name the additional tax the owner owes because there is no employer, and the schedule used to compute it.
c) Why is this owner generally required to make quarterly estimated payments, and roughly what is the dollar threshold that triggers that requirement?
Solution
Step 1 — (a) Where the income is reported: The $45,000 net profit is reported on Schedule C as part of the owner's personal Form 1040, and is taxed at ordinary individual rates along with the owner's other income.
Step 2 — (b) The extra tax and its schedule: Because no employer withholds Social Security and Medicare tax, the owner owes self-employment (SE) tax on the net earnings, computed on Schedule SE. (One-half of it is deductible on Form 1040.)
Step 3 — (c) Why estimated payments, and the threshold: No one is withholding tax during the year, so to keep the federal "pay-as-you-go" system working the owner must make quarterly estimated payments (Form 1040-ES) covering both income tax and SE tax. These are generally required once you expect to owe about $1,000 or more for the year; underpaying can trigger a penalty.
Answer: (a) Schedule C on Form 1040, taxed at individual rates. (b) Self-employment tax, computed on Schedule SE. (c) Because no tax is withheld, quarterly 1040-ES payments are required; the threshold is expecting to owe roughly $1,000 or more for the year.
Problem 7. Give two practical tools a sole proprietor can use to manage the risk that the business will owe more than it can pay, and briefly explain how each one helps.
Solution
Step 1 — Tool one, insurance: Carrying appropriate business liability insurance transfers much of the risk to an insurer. If the business is sued or something goes wrong, the policy can pay the claim (up to its limits) so the loss does not fall directly on the owner's personal assets.
Step 2 — Tool two, entity choice: Forming a limited-liability entity (an LLC or corporation) and maintaining it properly puts a legal wall between the owner and the business. The owner's loss is then generally limited to the amount invested, shielding personal savings, home, and car from business creditors.
Step 3 — How they work together: Insurance limits the size of a loss that reaches the business; entity choice limits whose assets are exposed to it. Together they are the two main tools for managing the risk that the business will owe more than it can pay.
Answer: (1) Business liability insurance — pays covered claims so losses don't hit personal assets. (2) Choosing a limited-liability entity (LLC/corporation) — caps the owner's exposure to the amount invested, shielding personal assets.
Key Terms
sole proprietorship — an unincorporated business owned entirely by one individual, in which the owner and the business are the same legal person.
unincorporated business — a business that has not been chartered as a separate legal entity with the state.
self-employed person — someone who carries on a trade or business as a sole proprietor or independent contractor.
trade or business — an activity carried on with a genuine profit motive and ongoing effort (as opposed to a hobby).
hobby — an activity pursued mainly for recreation with no real profit motive; hobby losses are not deductible like business losses.
unlimited personal liability — the owner's personal responsibility for all business debts and obligations, with no ceiling tied to the amount invested.
pass-through entity — a business whose income is not taxed at the business level but "passes through" to the owner's personal return.
Schedule C — the Form 1040 schedule on which a sole proprietor reports business profit or loss.
self-employment (SE) tax — Social Security and Medicare tax paid by a self-employed person on net business earnings, computed on Schedule SE.
estimated tax payments — quarterly payments (Form 1040-ES) covering income and self-employment tax under the federal pay-as-you-go system.