Register Your California Limited Liability Partnership With Confidence

A limited liability partnership begins as a general partnership and then takes a formal step that changes the liability picture. In an ordinary general partnership, every partner is personally on the hook for the debts, contracts, and wrongful acts of the business — and of every other partner. If one partner commits malpractice, a claimant can reach the personal assets of all of them. An LLP interrupts that chain. By registering with the state, the partnership adds a shield that protects each partner from personal liability for the negligence, wrongful acts, or misconduct of the other partners.

California recognizes LLPs under the California Revised Uniform Partnership Act, found in the Corporations Code beginning at Section 16951. The instrument that converts a general partnership into a registered LLP is a public filing called the Application to Register a Limited Liability Partnership — Form LLP-1 — filed with the California Secretary of State through the bizfile Online portal. Once that application is on file and approved, the partnership carries the "Registered Limited Liability Partnership," "Limited Liability Partnership," or "LLP" designation and the protections that come with it.

The protection that matters most

The central reason partners register an LLP is the shield against vicarious liability. Suppose you and three colleagues practice together and one of them is sued for a professional error. You don't want your home, savings, and retirement accounts exposed for a mistake you had nothing to do with. The LLP keeps that liability with the responsible partner and the partnership entity, not with the innocent partners personally. You always remain answerable for your own conduct — no partnership structure erases responsibility for your own negligence — but the LLP walls off the risk that flows simply from being someone's business partner.

California is stricter than most states about who may operate as an LLP. The structure is not open to any two people going into business together. Under the Corporations Code, a California LLP may be formed only to practice one of a defined set of licensed professions, and to provide services related to or ancillary to that practice.

The eligible professions

• Law — a partnership of attorneys licensed by the State Bar of California
• Public accountancy — a partnership of certified public accountants
• Architecture — a partnership of licensed architects
• Engineering and land surveying — permitted in combination with architecture, or on their own in the specific arrangements the statute allows

A partnership providing any of these services must have each partner licensed in the relevant profession, and the LLP itself is subject to the licensing board that regulates that field. That means a California LLP is fundamentally a professional vehicle — it exists so law firms, CPA firms, architecture practices, and engineering groups can share overhead and a brand while keeping each partner insulated from the others' professional exposure.

If your group is not a licensed professional practice, California will steer you toward a limited liability company or a limited partnership instead. It is worth confirming your eligibility with your licensing board before you file, because the Secretary of State expects the registration to reflect a qualifying profession.

California layers on a requirement that many other states skip: to keep its liability shield, a California LLP must maintain a minimum level of security for claims against it. In practice this means the partnership carries professional liability insurance, posts a surety bond, or sets aside designated funds up to the amounts the Corporations Code specifies for the profession involved.

This requirement exists precisely because the LLP protects partners from each other's malpractice. The state's compromise is that the partnership as a whole must stand behind a pool of money that an injured client can reach. The exact security figure scales with the number of licensed professionals in the partnership, and the relevant board and statute set the minimums. A California LLP that lets its required security lapse can lose the liability protection that made the structure worth registering in the first place — so treating the insurance or bond as a core compliance item, not an afterthought, matters here.

We are a filing service and not your insurance broker or your licensing counsel, so the specific policy limits and proof-of-security details are best confirmed with your carrier and your board. What we flag is simply that California uniquely ties the LLP shield to maintained security, and skipping it undermines the whole point of registering.

By default, an LLP is a pass-through entity for federal tax purposes. The partnership itself files an informational return (Form 1065) with the IRS, and profits and losses flow through to the partners, who report their shares on their personal returns. The LLP does not pay federal income tax at the entity level.

At the state level, California imposes an annual tax on every LLP registered or doing business in the state, paid to the Franchise Tax Board. This is a flat annual minimum tax that applies regardless of whether the partnership turned a profit, and there is no first-year waiver for LLPs the way there occasionally is for other entity types. The partnership also files a California partnership return (Form 565) and issues Schedule K-1s to the partners. Because the tax treatment of a professional partnership can get complicated fast — especially with partner draws, guaranteed payments, and multi-state practice — this is a conversation for your CPA, not something to improvise.

Mainstay Filing prepares and submits the state-facing paperwork so you don't have to learn the bizfile Online interface, puzzle over the Application to Register, or wonder whether you've satisfied every California requirement. When you start an order, you give us what the state needs: your partnership's name, its principal and mailing addresses, the profession it practices, and your choice of agent for service of process. We prepare Form LLP-1, submit it through the Secretary of State, and send you the filed confirmation once the state processes it.

We also serve as your registered agent, which keeps a professional California address in the public record instead of a partner's home address and guarantees someone is available during business hours to receive legal documents and state mail. After registration, we track the biennial Statement of Information deadline for you and can file it when it comes due.

What we don't do

We're a filing service, not a law firm, a CPA firm, or an insurance broker. We don't give legal or tax advice, we don't structure the profit split between partners, and we don't arrange your professional liability coverage or advise on the security-for-claims requirement. Those belong with your attorney, your accountant, and your carrier. What we do is make sure the paperwork the state sees is correct and on time, so your practice can focus on serving clients.