Choosing a business structure is the most consequential legal decision a new US business owner makes, because it determines personal liability, how profits are taxed, and how much paperwork you carry every year. Get it right and you protect your assets while keeping the tax bill reasonable.
The five structures below cover nearly every small business in America, and the differences between them are largely about liability and tax treatment. This guide explains each one in plain language, with the 2026 tax figures that actually decide which is cheapest for you.
Business Structures Compared at a Glance
| Structure | Liability Protection | How Profits Are Taxed | Best For |
|---|---|---|---|
| Sole Proprietorship | None | Personal return, full 15.3% self-employment tax | Solo side businesses with low risk |
| General Partnership | None | Passed through to each partner’s return | Two or more owners testing an idea |
| LLC | Yes | Pass-through by default, flexible election | Most small businesses |
| S-Corporation | Yes | Pass-through, only salary faces payroll tax | Profits consistently above $40,000 to $60,000 |
| C-Corporation | Yes | 21% corporate rate, then taxed again on dividends | Retaining profits or raising investment |
The 5 Business Structures Explained
1. Sole Proprietorship: The Default
Liability Protection: None | Taxation: Personal return, full self-employment tax | Best For: Low-risk solo work
A sole proprietorship is what you automatically have when you start earning business income without forming a separate entity. There is nothing to file beyond any local business licenses, and profits are reported on Schedule C of your personal return.
The critical weakness is that there is no legal separation between you and the business, so a lawsuit or business debt can reach your personal savings, car, and home. It suits low-risk freelance or side income, but almost any business with customers on premises, employees, or meaningful contracts has outgrown it.
2. General Partnership: Two or More Owners, Same Exposure
Liability Protection: None | Taxation: Passed through to each partner | Best For: Simple co-owned ventures
A general partnership is the multi-owner equivalent of a sole proprietorship, formed by default when two or more people run a business together without registering an entity. Profits and losses flow through to each partner’s personal return in proportion to their share.
It carries the same fundamental problem, and arguably worse: partners are personally liable, and each can typically bind the business to obligations. Most partnerships are better served by forming a multi-member LLC, which preserves the pass-through tax treatment while adding liability protection.
3. LLC: The Default Choice for Most Small Businesses
Liability Protection: Yes | Taxation: Pass-through by default, election available | Best For: The majority of small businesses
A limited liability company separates your personal assets from business debts and lawsuits while keeping taxes simple. A single-member LLC is treated as a disregarded entity, meaning the IRS taxes it exactly like a sole proprietorship, and a multi-member LLC is taxed as a partnership by default.
Its real advantage is flexibility: an LLC can later elect to be taxed as an S-corporation or C-corporation without changing its legal form. That combination of protection, simplicity, and optionality is why it is the standard recommendation, and forming one is straightforward through the best LLC formation services.
4. S-Corporation: The Self-Employment Tax Saver
Liability Protection: Yes | Taxation: Pass-through, payroll tax on salary only | Best For: Profits above roughly $40,000 to $60,000
An S-corporation is a tax election rather than a separate business type, available to both LLCs and corporations. Its appeal is specific: you pay yourself a reasonable W-2 salary that is subject to payroll taxes, and remaining profits are distributed without incurring self-employment tax.
Because self-employment tax runs 15.3%, that split can save thousands once profits are large enough. The trade-off is real complexity, including running payroll, filing a separate return, and justifying your salary as reasonable to the IRS, which is why the election generally makes sense only once net income consistently exceeds $40,000 to $60,000.
5. C-Corporation: Built for Growth and Investment
Liability Protection: Yes | Taxation: 21% corporate rate, dividends taxed again | Best For: Retaining profits or raising capital
A C-corporation is a fully separate taxable entity, paying a flat 21% federal corporate rate on its profits. The well-known drawback is double taxation, since profits distributed to owners as dividends are taxed again on their personal returns.
Despite that, it wins in two specific situations: when you plan to retain most profits inside the business for growth, since 21% beats the top individual rate of 37%, and when you intend to raise venture capital, because investors expect the C-corporation share structure. For a business generating substantial profit it plans to reinvest, the math can favor it decisively.
How Self-Employment Tax Actually Works
Self-employment tax is the single biggest cost driver in this decision. The rate is 15.3% for 2026, covering Social Security and Medicare, and it applies to 92.35% of your net business profit.
Importantly, the 12.4% Social Security portion applies only up to the wage base, which rises to $184,500 in 2026 from $176,100 in 2025, while the 2.9% Medicare portion applies to all earnings. Sole proprietors, partners, and default-taxed LLC owners all pay it in full, which is precisely the cost an S-corporation election is designed to reduce.
The QBI Deduction Is Now Permanent
Pass-through owners gained significant certainty when the One Big Beautiful Bill Act, signed July 4, 2025, made the 20% Qualified Business Income deduction permanent. It had previously been scheduled to expire.
That deduction lets eligible sole proprietors, partners, LLC members, and S-corporation shareholders deduct up to 20% of qualified business income before calculating income tax. For most small businesses it is now the single most valuable ongoing tax advantage of staying a pass-through entity rather than converting to a C-corporation.
Where Federal Tax Brackets Land in 2026
Because pass-through profits are taxed at your personal rate, the brackets matter. For 2026 there are seven federal brackets, starting at 10% on income up to $11,925 and topping out at 37% on income above $626,350.
This is why the C-corporation’s flat 21% rate becomes attractive at high profit levels, but only if you retain the money in the business. The moment you pay it out as dividends, the second layer of tax usually erases the advantage for a small business.
The Paperwork Behind Each Choice
Tax treatment gets the attention, but ongoing compliance is what owners actually live with. A sole proprietorship or general partnership requires no formation filing at all, which is the main reason people default into them.
An LLC requires filing articles of organization with your state, maintaining a registered agent, and in most states submitting an annual or biennial report with a fee. An S-corporation adds real administrative weight on top of that: running payroll, issuing yourself a W-2, and filing a separate business return. A C-corporation is the most formal of all, expecting a board, recorded minutes, and its own corporate return. Because filing fees, annual report costs, and franchise taxes vary widely by state, check your own state’s requirements before assuming a structure is cheap to maintain.
How to Choose the Right Structure
Start with liability, because it is not really optional. If your business has customers, employees, physical premises, or contracts, you want the protection of an LLC or corporation, and the modest filing cost is cheap insurance.
Then let profit level decide the tax treatment. Below roughly $40,000 in net income a standard LLC is usually simplest and cheapest; above that range an S-corporation election starts to pay for its complexity; and a C-corporation makes sense mainly for reinvested profits or venture funding. The Small Business Administration outlines the requirements for each, and because state rules and personal circumstances vary, this is a decision worth confirming with a CPA or attorney rather than treating any article as advice.
Frequently Asked Questions
What is the best business structure for a small business?
An LLC suits most small businesses, combining personal liability protection with simple pass-through taxation and the flexibility to elect S-corporation treatment later as profits grow.
When should I elect S-corporation status?
Generally once net income consistently exceeds roughly $40,000 to $60,000. Below that, the payroll, bookkeeping, and separate filing costs usually outweigh the self-employment tax savings.
How much is self-employment tax in 2026?
The rate is 15.3% on 92.35% of net profit. The 12.4% Social Security portion applies only up to the $184,500 wage base for 2026, while the 2.9% Medicare portion applies to all earnings.
Is an LLC or sole proprietorship better?
An LLC is better for almost any business with real risk, since a sole proprietorship offers no separation between business and personal assets. Both are taxed the same way by default, so the LLC adds protection without adding tax.
Does a C-corporation really get taxed twice?
Yes, when profits are distributed. The corporation pays 21% on profits, and shareholders pay personal tax on dividends. This matters far less if you retain earnings inside the business for growth.