1. The Five Main Business Structures
These five entity types cover most U.S. .usinesses. Each draws a different line between personal and business risk, and between administrative simplicity and formal structure.
Sole Proprietorships and Partnerships
A sole proprietorship requires no formal registration; the owner and the business are one legal entity, which means full personal liability for every debt and lawsuit. A general partnership works the same way for two or more owners: often no formation filing at the entity-creation stage, though separate registrations or licenses may apply, and every partner is personally exposed to judgments caused by the others.
Limited Liability Companies
An LLC separates personal assets from business debts and allows members to choose how the entity is taxed. It is the popular choice for many small businesses because it provides liability protection without the formality of a corporation. In New York, formation requires Articles of Organization filed with the Department of State, follow New York’s publication requirement within the statutory period and file the required certificate.
S-Corporations and C-Corporations
An S-Corp elects pass-through taxation under Subchapter S of the Internal Revenue Code. Shareholders avoid federal income tax at the entity level, but eligibility is restricted: no more than 100 shareholders, one class of stock, and U.S. .itizens or residents only. A C-Corp has no ownership restrictions and pays corporate income tax at a flat 21% federal rate. Shareholders then pay personal income tax on dividends received. That structure suits businesses planning outside investment or a public offering.
| Sole Prop. | Partnership | LLC | S-Corp | C-Corp | |
| Personal liability protection | None | None | Yes | Yes | Yes |
| Pass-through federal taxation | Yes | Yes | Flexible | Yes | No |
| Formation complexity | Low | Low | Moderate | Moderate | High |
| Ownership restrictions | None | None | None | Strict | None |
| Self-employment tax on all income | Yes | Yes | Yes* | No** | No |
Personal liability protection
- Sole Prop.None
- PartnershipNone
- LLCYes
- S-CorpYes
- C-CorpYes
Pass-through federal taxation
- Sole Prop.Yes
- PartnershipYes
- LLCFlexible
- S-CorpYes
- C-CorpNo
Formation complexity
- Sole Prop.Low
- PartnershipLow
- LLCModerate
- S-CorpModerate
- C-CorpHigh
Ownership restrictions
- Sole Prop.None
- PartnershipNone
- LLCNone
- S-CorpStrict
- C-CorpNone
Self-employment tax on all income
- Sole Prop.Yes
- PartnershipYes
- LLCYes*
- S-CorpNo**
- C-CorpNo
*Active LLC members pay self-employment tax on net profit.
**reasonable compensation paid as salary is subject to payroll taxes; distributions are not subject to self-employment tax.
2. Liability Protection and the Corporate Veil
LLCs, S-Corps, and C-Corps create a legal separation between owner and business; a creditor generally cannot reach personal assets to satisfy a business debt. Sole proprietors and general partners have no such protection.
That separation depends on how the entity is maintained. Courts can set aside the liability shield when owners commingle personal and business accounts, fail to document business decisions in writing, or leave the business undercapitalized at formation. The structure on paper offers protection only when the behavior behind it is consistent. Business entity insurance complements this, but it does not replace good recordkeeping.
3. Tax Structure by Entity Type
Entity type determines not just how much you pay in taxes, but which taxes apply and when they hit. Federal treatment differs across structures, and New York imposes its own franchise tax on corporations and certain LLCs on top of that.
Pass-through Taxation
Pass-through entities pay no federal income tax at the entity level. Income flows to each owner's personal return and is taxed at individual rates, whether or not it was distributed.
The S-Corp Election and Self-Employment Taxes
Active owners of sole proprietorships, partnerships, and single-member LLCs pay self-employment tax on all net business income. An S-Corp election changes that: the owner pays payroll taxes on a reasonable salary, but profits distributed above that salary are not subject to self-employment tax. For businesses with consistent net annual profit above roughly $100,000, that difference usually outweighs the added compliance cost. C-Corps can retain earnings at the 21% corporate rate without distributing them, which defers personal income tax on those amounts.
4. Compliance Requirements
Compliance obligations grow with entity complexity, and New York imposes some requirements other states do not. A sole proprietorship or general partnership needs little beyond a DBA filing when operating under a trade name.
For formal entities in New York:
- LLC: Articles of Organization, biennial statements with the Department of State, a written operating agreement (required by statute, though not filed with the state), and publication in two county-designated newspapers within 120 days.
- Corporation (S or C): Certificate of Incorporation, bylaws, documented shareholder and director meetings, ongoing state filings and tax compliance, and state franchise taxes.
An LLC provides comparable liability protection to a corporation with considerably less ongoing formality, which is why most small business owners start there.
5. When to Restructure
The right structure at formation is not always right as the business grows. An S-Corp election becomes worth examining when net annual profit consistently exceeds roughly $100,000. Adding a co-owner with equity, entering a regulated industry, or expanding into other states each shifts the risk and compliance picture enough to warrant a review.
Most states allow conversion without dissolving the original entity. In New York, an LLC can convert to a corporation through a statutory merger process. Business entity conversion requires coordinating federal tax elections, state filings, and review of any contracts with change-of-control provisions. Timing it to a clean fiscal year boundary avoids the most common accounting complications.
6. How Our Attorneys Help
Choosing a business entity is a formation, tax, and risk decision that compounds over time. Our attorneys assess industry exposure, ownership structure, projected revenue, and multi-state obligations before recommending an entity type. Where structure intersects with tax strategy, we coordinate with the client's accountant to model the actual after-tax outcomes before any filing.
Our business formation services include entity selection, Articles of Organization and Certificate of Incorporation drafting, S-Corp elections, operating agreement preparation, and compliance planning across multiple states.
7. Frequently Asked Questions
What is the most common business entity for small businesses?
The LLC, because it combines liability protection with flexible taxation and fewer administrative requirements than a corporation.
What is the difference between an S-Corp and a C-Corp?
Both form the same way at the state level. The difference is federal tax treatment: an S-Corp elects pass-through taxation and has strict ownership limits; a C-Corp pays corporate income tax but accepts unlimited investors and share classes.
When does an S-Corp election make financial sense?
When an active owner's net annual profit consistently exceeds around $100,000. Below that level, payroll administration and added filing costs typically outweigh the self-employment tax savings.
Do New York LLCs need an operating agreement?
Yes. New York law requires a written operating agreement for every LLC. It is not filed with the state, but it governs how the business runs, how profits are divided, and what happens when a member exits.
09 Feb, 2026
