Form a Washington Limited Liability Partnership Without the Guesswork

A limited liability partnership is a general partnership that has taken an extra step with the state to add a liability shield. Two or more people go into business together as partners, share in the profits, and share in the management — but by registering as an LLP, they protect themselves from being personally liable for the negligence, malpractice, or misconduct of the other partners and of the partnership's employees.

Washington authorizes LLPs under the Revised Uniform Partnership Act, codified in Chapter 25.05 of the Revised Code of Washington. The formation happens through the Washington Secretary of State's Corporations and Charities Division, filed electronically in the Corporations and Charities Filing System (CCFS). Until a partnership registers as an LLP, it is treated as an ordinary general partnership, and in a general partnership every partner is personally on the hook for the debts and liabilities of the business, including things another partner did.

How an LLP differs from a general partnership

The distinction is the shield. In a garden-variety general partnership, if one partner commits malpractice or runs up a debt, creditors and claimants can pursue every partner's personal assets. Registering as an LLP changes that. Under RCW 25.05, a partner in a registered LLP is not personally liable for partnership obligations that arise while the LLP registration is in effect, whether those obligations come from contract or from the negligence of another partner.

What the shield does not do is erase a partner's responsibility for their own conduct. If you personally commit malpractice, you remain accountable for your own acts. The LLP protects you from vicarious liability — being dragged into someone else's problem simply because you share a partnership with them.

The LLP was designed with professional practices in mind, and in Washington it remains most common among licensed professionals: law firms, accounting practices, architecture and engineering groups, medical and dental practices, and consulting firms organized as partnerships. These are fields where the partners want to pool a practice under one roof but do not want one partner's malpractice claim to reach into everyone else's savings.

Professional practices

If your practice is regulated by a state licensing board, the LLP is often a natural fit because it preserves the partnership model your profession is used to while adding modern liability protection. Some licensed professions in Washington have specific rules about which entity types they may use and how ownership must be structured, so confirm the requirements with your board before you file.

General small businesses run by two or more owners

You do not have to be a licensed professional to use an LLP. Any business with two or more owners who genuinely operate as partners can register. That said, many multi-owner businesses in Washington instead choose the LLC, which offers a comparable shield with a slightly different governance and tax posture. The right answer depends on your profession's rules, how you want the business taxed, and how the partners intend to split management. This is a conversation worth having with an accountant.

When an LLP is not the answer

A single owner cannot form an LLP — a partnership by definition needs at least two partners. If you are on your own, a single-member LLC or a sole proprietorship is the path. And if your goal is to raise outside investment with passive investors who take no management role, other structures may serve better.

Registration runs through the Corporations and Charities Division of the Secretary of State, filed online in CCFS. The core filing is the application to register as a limited liability partnership — the document that converts your general partnership into a registered LLP on the state's records.

The application captures the essentials: the partnership's name, its principal office address, the name and Washington street address of its registered agent, and the number of partners at the time of filing. Washington assigns your entity a Unified Business Identifier (UBI) number, which becomes the reference number you use across state agencies.

Processing timeline

Online filings through CCFS generally process within a few business days. Paper filings sent by mail take considerably longer — often several weeks — and expedited handling is available for an additional fee if you are on a tight deadline. Once the state processes your registration, your LLP appears in the CCFS business search and your filed record becomes available.

What the registration includes

• Partnership name: Must include a designator identifying it as a limited liability partnership, such as "Limited Liability Partnership," "L.L.P.," or "LLP," and must be distinguishable from other names on file.
• Principal office address: The main business address. A physical address is expected for the registered agent; a bare P.O. Box is not acceptable for the agent.
• Registered agent: A person or company with a physical Washington street address, available during business hours, who consents to the appointment.
• Number of partners: Washington asks for the count of partners as of the filing.

Naming a registered agent — and keeping one on file without interruption — is mandatory for every Washington LLP. The agent is the official recipient for service of process — lawsuits, subpoenas, and summonses — and for state correspondence such as annual report reminders and compliance notices.

What the agent must be

• A Washington resident individual, or a company authorized to do business in Washington, with a physical street address in the state
• Available during ordinary business hours to accept hand-delivered documents
• Willing to consent to the appointment; Washington requires the agent's consent

Your options

A partner who lives in Washington and keeps regular business hours can serve as the LLP's agent, but that partner's address then appears in the public CCFS record. Many partnerships prefer a commercial registered agent service so that a professional address sits in the public database instead of a partner's home, and so that legal documents are never missed because everyone happened to be out of the office or in court.

Registration is a one-time event. Keeping the LLP in good standing is a recurring obligation, and it is where partnerships most often slip.

Annual report

Washington requires every registered LLP to file an annual report with the Secretary of State. The report keeps the state's record of your agent, principal office, and partner contact current. It is not a financial statement — you are not reporting revenue or profit. Missing it puts the LLP at risk of losing its active status, which in turn can put the liability shield in question.

Business licensing and B&O tax

Separate from the Secretary of State registration, most Washington businesses must register with the Department of Revenue through the state's Business Licensing Service and file Washington's Business & Occupation (B&O) tax. The B&O tax is a gross-receipts tax handled by the Department of Revenue, entirely apart from your LLP registration.

Registered agent maintenance

If your agent moves, resigns, or you switch providers, you must update the record with the Secretary of State. An LLP with a stale or invalid agent address is out of compliance even when its annual report is current.

Mainstay Filing prepares and submits the LLP registration so you are not left decoding the CCFS interface or second-guessing whether every field was answered correctly. You give us the partnership's name, its address, the partner count, and your choice of registered agent, and we file the application to register your limited liability partnership with the Secretary of State and return the filed record once the state processes it.

We include registered agent service, so a professional Washington address sits in the public record instead of a partner's home, and so nothing addressed to the LLP gets lost. After registration, we track the annual report deadline and can file it for you.

What we don't do

We are a filing service, not a law firm or an accounting practice. We do not draft your partnership agreement's economic terms, give tax advice, or advise on which entity your professional board permits. For those, you want an attorney or a CPA. What we handle is the state-facing paperwork — done correctly and on time — so the partners can concentrate on the practice.