California businesses can be organized as a sole proprietorship, general partnership, limited partnership (LP), limited liability partnership (LLP), limited liability company (LLC), C corporation, or S corporation. Each has distinct tax, liability, and operational characteristics that affect which is most appropriate for a given situation.

LLCs offer flexible management structures, pass-through taxation by default, and strong liability protection with fewer formalities than corporations. Corporations (C-corps or S-corps) are better suited for businesses seeking venture capital, issuing stock to employees, or planning a public offering. Both provide personal liability protection for owners when properly maintained.

An operating agreement governs the internal workings of an LLC — including ownership percentages, management rights, profit distributions, member voting, and what happens when a member departs. California law does not require a written operating agreement, but every multi-member LLC should have one to prevent future disputes and prove the entity's legitimacy.

A registered agent (also called an agent for service of process) is the individual or entity designated to receive legal notices, lawsuits, and official government correspondence on behalf of the business. California requires every LLC and corporation to maintain a registered agent with a California street address.

Forming an LLC or corporation creates a legal separation between your personal assets and the business. To maintain that protection, you must keep business and personal finances separate, sign contracts in the business's name, maintain adequate capitalization, and follow corporate formalities (for corporations) or maintain the LLC as a genuine separate entity.

Veil piercing occurs when a court holds individual owners personally liable for the debts of the business because the corporate or LLC form was used improperly. To avoid it, maintain separate bank accounts, avoid personal guarantees when possible, keep records updated, do not commingle funds, and ensure the entity is adequately funded for its intended operations.

A founders' agreement should address equity splits, vesting schedules, each founder's roles and responsibilities, what happens if a founder leaves before vesting, intellectual property ownership, decision-making authority, and buy-sell rights. Addressing these issues early prevents costly disputes when the business grows — or when a founder departs.

You can file the necessary formation documents with the California Secretary of State without an attorney, but the consequences of choosing the wrong entity, drafting inadequate governing documents, or missing tax elections can be significant. An attorney can help you make the right structural choices from the start, reducing costly corrections later.