Choosing a business structure comes down to three questions: how much of your personal wealth you’re willing to put at risk, how you want your profits taxed, and whether you’ll need outside investors. A sole proprietorship costs nothing to start but leaves everything you own exposed. An LLC or corporation walls off personal assets but adds filing fees, paperwork, and governance rules. Tax treatment splits along the same line: pass-through entities avoid entity-level federal income tax, while C-corporations pay a flat 21% and shareholders pay again on dividends. Getting the decision right at the start saves real money and avoids restructuring later.
How Much Personal Risk Each Structure Carries
A sole proprietorship creates no legal separation between you and the business. Every debt, lawsuit, or judgment is your personal obligation. If a customer wins a $100,000 verdict, the creditor can go after your bank accounts, your car, and your home equity. Nothing sits safely out of reach just because the liability arose on the business side.
General partnerships multiply that exposure. Each partner acts as an agent for the business, so one partner’s handshake deal can bind everyone. Partners face joint and several liability: a plaintiff who wins a judgment can collect the full amount from whichever partner has the deepest pockets, even if that partner had nothing to do with the harm.1Legal Information Institute. General Partner The partner who pays can seek reimbursement from the others, but that’s a separate fight.
LLCs and corporations exist as their own legal persons. When the business takes on debt or gets sued, the entity is responsible. Creditors generally cannot reach through the company to grab an owner’s personal bank account, house, or retirement savings. Corporate shareholders can lose the money they paid for stock but nothing beyond that. LLC members get the same basic protection with a more flexible management structure: an LLC can be run by its owners directly or by appointed managers, with the details set in an operating agreement rather than dictated by statute.
The shield isn’t automatic. Courts can pierce the corporate veil and hold owners personally responsible when the entity isn’t treated as genuinely separate from the people behind it. Commingling personal and business funds, failing to keep separate records, and using the entity as a personal piggy bank are the classic triggers. Keeping the veil intact means the entity needs its own bank account, its own tax ID, and its own books. Corporations should hold annual meetings and document major decisions by resolution. LLCs need a current operating agreement and records showing members respect the line between their money and the company’s.
The shield also won’t protect you from your own wrongdoing. It blocks vicarious liability, meaning claims that flow to you only because you own the business. It does nothing about direct liability for your personal conduct. If you commit malpractice, cause an injury through negligence, or personally defraud a customer, you’re on the hook regardless of what entity sits between you and the plaintiff. This is why commercial general liability insurance still matters even when you operate through an LLC or corporation. Structure protects personal assets from business debts; insurance pays defense costs and settlements.
How Each Structure Is Taxed
Federal income tax hits business profits through two very different models, and the split drives many structure decisions.
Pass-Through Entities
Sole proprietorships, partnerships, and most LLCs pay no federal income tax at the entity level. Net profit or loss flows to the owners’ personal returns.2Internal Revenue Service. About Form 1065, U.S. Return of Partnership Income Sole proprietors report business income on Schedule C of Form 1040.3Internal Revenue Service. Instructions for Schedule C (Form 1040) Partnerships and multi-member LLCs file Form 1065 as an informational return, and each owner reports their share on their individual return.4Internal Revenue Service. Instructions for Form 1065 Profits are taxed once. The same dollar of earnings doesn’t get hit at both the business and individual level.
C-Corporations
C-corporations pay a flat 21% federal income tax on their own taxable income, filed on Form 1120.5Internal Revenue Service. U.S. Corporation Income Tax Return (Form 1120) When the corporation distributes after-tax profits as dividends, shareholders owe tax on the dividend income too. That’s two layers of tax on the same earnings.
Double taxation sounds like a straight loss, and for many small businesses it is. But C-corporations that reinvest profits rather than paying dividends can defer the second layer indefinitely. The 21% flat rate also sits below the top individual rate, so high-earning businesses sometimes pay less total tax by retaining profits inside a C-corporation than they would through a pass-through.
The S-Corporation Election
An S-corporation election lets a corporation (or an LLC that has elected corporate treatment) be taxed as a pass-through while keeping the liability protection of the corporate form. You file Form 2553 with the IRS, and the deadline is two months and 15 days after the start of the tax year you want the election to take effect. To qualify, the business must be a domestic corporation with no more than 100 shareholders, only one class of stock, and only eligible shareholders, which generally means individuals, certain trusts, and estates. Other corporations and partnerships cannot be S-corporation shareholders.6Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined If your growth plan involves taking investment from a venture capital fund organized as an LLC or another corporation, the S election is off the table.
The Qualified Business Income Deduction
Pass-through owners can offset part of the C-corp rate advantage through Section 199A, which lets non-corporate taxpayers deduct up to 20% of qualified business income from pass-through entities.7Office of the Law Revision Counsel. 26 USC 199A – Qualified Business Income If your pass-through business earns $100,000, you could potentially exclude $20,000 from taxable income. The deduction phases down at higher income levels based on W-2 wages the business pays and the value of depreciable property. Service businesses in law, medicine, consulting, accounting, and financial services face tighter limits, with the deduction phasing out entirely once taxable income crosses the upper threshold. For 2026, the phase-out ranges are inflation-adjusted and apply at roughly $200,000 for single filers and twice that for joint filers.
Self-Employment Tax and Paying Yourself
Income tax is only half the picture. How you pay yourself, and how much you owe in payroll-style taxes, varies sharply by structure.
Sole proprietors, general partners, and most LLC members owe self-employment tax on their share of business net income. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.8Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax The Social Security portion applies only up to $184,500 of net self-employment income in 2026.9Social Security Administration. Contribution and Benefit Base The Medicare portion has no cap. Self-employment income above $200,000 for single filers ($250,000 for married couples filing jointly) triggers an additional 0.9% Medicare surtax. A sole proprietor earning $150,000 in net business income owes roughly $22,950 in self-employment tax alone, before any income tax.
S-corporation owners who work in the business must pay themselves a reasonable salary, subject to the same Social Security and Medicare taxes as any W-2 employee. Profits distributed beyond that salary aren’t subject to self-employment tax. The savings come from the gap between total business income and the reasonable salary. The IRS watches this closely. If your business earns $200,000 and you pay yourself $30,000, expect scrutiny. Courts look at what similar businesses pay for comparable work, the time and effort you put in, and the company’s dividend history.10Internal Revenue Service. Wage Compensation for S Corporation Officers (FS-2008-25) The salary has to be defensible. Even a conservative split can save an S-corp owner thousands a year compared to paying self-employment tax on the full amount.
LLCs taxed as partnerships pay members through guaranteed payments (fixed amounts, similar to a salary) or draws (distributions of profits).11Internal Revenue Service. Publication 541 (12/2025), Partnerships Guaranteed payments and a member’s distributive share of partnership income are generally subject to self-employment tax, which is why many LLC owners eventually consider electing S-corporation tax treatment as income grows.
Raising Capital and Bringing in Investors
Your structure sets the ceiling on how you can fund growth.
A sole proprietorship has no equity to sell. The business is you, legally, so the only options are personal loans, credit lines, and reinvesting profits. If you need outside investment, you need a different structure.
C-corporations are built for capital raising. They can issue multiple classes of stock with different voting rights, dividend preferences, and liquidation priorities. Preferred shares that guarantee dividends before common shareholders get paid are standard in venture capital deals. Virtually every company that goes public or takes institutional funding operates as a C-corporation.
C-corporations also offer a tax incentive that benefits investors directly. Under Section 1202, a non-corporate taxpayer who holds qualified small business stock for at least five years can exclude up to 100% of the capital gain on sale, provided the stock was acquired after September 27, 2010 and at original issuance. The company must be a domestic C-corporation with gross assets that never exceeded $75 million, and it must use at least 80% of its assets in an active trade or business.12Office of the Law Revision Counsel. 26 USC 1202 – Partial Exclusion for Gain From Certain Small Business Stock Health care, law, consulting, and financial services are excluded. For eligible startups, this can mean millions in tax-free gains for early investors and founders.
LLCs raise capital by adding new members, which requires amending the operating agreement to spell out the new member’s ownership percentage, capital contribution, and rights. It’s flexible but less standardized than issuing stock. There’s no public market for LLC membership interests, which makes it harder for investors to exit. Sophisticated investors often negotiate buyout provisions or conversion rights upfront.
S-corporations can issue stock, but the rules that preserve the S election create real fundraising obstacles: no more than 100 shareholders, only individuals and certain trusts and estates as shareholders, and only one class of stock.6Office of the Law Revision Counsel. 26 USC 1361 – S Corporation Defined Since venture funds are typically organized as LLCs or limited partnerships, they cannot hold S-corporation stock at all. A business that takes VC money almost always needs to be a C-corporation or convert to one.
Corporate shares are also easier to transfer than LLC membership interests. A shareholder can usually sell stock without the company’s permission, while LLC operating agreements almost always restrict transfers and require member approval. For passive investors who want a clear exit path, that liquidity difference often tips the scale toward corporate structures.
Setup Costs and What You’ll Owe Every Year
Sole proprietorships are essentially free to start. Unless you use a business name different from your legal name, there’s typically no state filing. Partnerships can also operate without a formal filing, though a written partnership agreement is strongly advisable to avoid default state rules that may not match what the partners actually intended.
LLCs and corporations require a formation filing with the state, usually articles of organization for LLCs or articles of incorporation for corporations. Filing fees vary widely, ranging from roughly $35 to $500. Most states also require a registered agent, a person or company designated to receive legal documents and government notices on the entity’s behalf. You can serve as your own registered agent, but many owners hire a service for a few hundred dollars a year to avoid missing a lawsuit filing.
Ongoing costs add up. Most states require an annual or biennial report, often with a fee. Some states also charge a franchise tax or minimum tax that applies whether the business earned anything. Recurring obligations range from nothing in a handful of states to several hundred dollars a year. Failing to file can cost the entity its good standing, which jeopardizes the liability shield and the ability to enforce contracts.
Corporations carry the heaviest compliance load. They should maintain bylaws, hold annual meetings of shareholders and directors, document decisions through written resolutions, and keep a stock ledger. LLCs have more flexibility but still need an operating agreement and records showing the entity operates as a genuinely separate organization. These governance costs are the price of the liability protection. Skipping them is how owners end up with a corporate veil that doesn’t hold up in court.
On the federal side, any structure with more than one owner needs an Employer Identification Number from the IRS. Domestic companies are currently exempt from the federal Beneficial Ownership Information reporting requirement under the Corporate Transparency Act, which was narrowed in March 2025 to apply only to foreign entities registered to do business in the United States.13Financial Crimes Enforcement Network (FinCEN). Beneficial Ownership Information Reporting
Matching the Structure to Your Situation
If your business is low-risk, small, and you have no plans to bring in partners or investors, a sole proprietorship keeps things cheap and simple, at the cost of full personal exposure. If you’re going into business with someone else and want the same simplicity, a partnership works but multiplies the liability risk across every partner. An LLC is the common middle ground: liability protection, pass-through taxation by default, flexibility on management, and the option to elect S-corporation tax treatment once profits grow enough to make the payroll-tax savings worth the added paperwork. A C-corporation makes sense when you’re planning to raise venture capital, issue multiple classes of stock, or eventually go public, and when the Section 1202 exclusion or retained-earnings deferral outweighs the double-tax problem for your situation.
None of these choices is permanent. LLCs can elect corporate tax treatment. S-corps can revoke their election. Entities can convert from one form to another, though the mechanics and tax consequences vary by state and situation. The goal at formation is to pick the structure that fits where the business is now and where you realistically expect it to be in the next few years, not to lock yourself in forever.