How do I choose the right business structure?

The right business structure depends on three variables: how much personal liability protection you need, how you want the business taxed, and how much administrative complexity you can manage. For most small businesses, the decision comes down to sole proprietorship, LLC, S-corp, or C-corp.

Your entity structure affects three things that compound over time: personal liability exposure, how profits are taxed, and how lenders and investors evaluate your business. The SBA's entity-type guide outlines the four primary structures used by U.S. small businesses. This page summarizes the decision factors — consult a licensed attorney or CPA before making your final choice.

The four main structures compared

Sole proprietorship — zero formation cost, no state filing required. Owner and business are the same legal entity: you are personally liable for all debts and judgments. Simplest to start; hardest to protect.
LLC (Limited Liability Company) — formed by filing Articles of Organization with your state's Secretary of State. Creates a legal separation between you and the business. Taxed as a pass-through (like a sole prop) by default, with the option to elect S-corp treatment. Most common structure for small businesses seeking financing.
S-corp — an IRS tax election (not a separate formation type) layered on top of a corporation or an LLC. Pass-through taxation, but owners who work in the business must pay themselves a reasonable salary. Can reduce self-employment tax on distributions above the salary.
C-corp — the entity type required for venture capital and institutional equity. Pays corporate income tax before distributing to shareholders (potential double taxation). Rarely the right default structure for bootstrapped SMBs.

The two questions that drive the decision

Do you need liability protection? If yes, eliminate sole proprietorship — an LLC or corporation is the minimum threshold.
How are you funding the business? If you're seeking traditional small-business loans or SBA financing, an LLC is the most widely accepted structure. If you're raising equity from outside investors, a C-corp (typically Delaware) is the standard.

How structure affects financing

Lenders require a formal entity with an EIN and business bank account history before approving most term loans or lines of credit. Sole proprietors can access financing (see how to get a business loan as a sole proprietor), but liability exposure and the absence of a separate credit file often limit options and loan size. LLCs can build a dedicated business credit profile through Dun & Bradstreet, Experian Business, and Equifax Business. An LLC with an EIN, a business bank account, and 12+ months of operating history is the minimum viable profile for most lenders.

State filing and costs

LLCs and corporations are formed at the state level through your state's Secretary of State office. Filing fees typically range from $50 to $500 depending on the state; many states also charge annual report fees. Some states impose an annual franchise tax on LLCs regardless of revenue (California's minimum is $800/year, for example). Factor recurring state costs into your structure decision, not just the upfront filing fee. The SBA state registration portal index links to each state's official filing site.

SBA on business structures

The SBA identifies four main business structures for small businesses: sole proprietorship, partnership, LLC, and corporation — each with distinct implications for taxes, liability, and ability to raise money. — SBA — Choose a Business Structure
An LLC provides personal liability protection from business debts and lawsuits and offers flexible taxation: pass-through by default, with the option to elect C-corp or S-corp treatment with the IRS. — SBA — Choose a Business Structure
A sole proprietor and the business are legally the same entity — there is no separation between personal and business assets, meaning personal assets can be used to satisfy business liabilities. — SBA — Choose a Business Structure

Key takeaways

LLC is the most common structure for small businesses seeking financing — it separates liability and builds a distinct business credit profile.
Sole proprietorship has zero formation cost but offers no personal liability protection and limits financing options.
S-corp is a tax election on top of a corporation or LLC — not a standalone formation type; consider it once revenue justifies salary + distributions.
C-corp is typically for venture-backed companies; it introduces double taxation and more compliance overhead.
Consult a licensed attorney or CPA before choosing — state-specific costs, industry regulations, and your exit plan all factor in.