Setting Up a Business Partnership in Washington (2026)
Reviewed by DocDraft Legal Team · Washington · Last updated 2026-05-18
Setting up a business partnership in Washington runs on Washington's own partnership statute, not a generic national form. Washington operates under the Revised Uniform Partnership Act. $70. The dissolution authority sits at section 25.05.300. This guide covers the Washington-specific rules on formation, partner authority, registration of LLP and LP variants, tax filing, annual reporting, and dissolution.
Key Considerations
Beyond the general partnership default, Washington recognizes registered partnership forms. 200 $180.00
Two or more people doing business together in Washington fall under the Revised Uniform Partnership Act. Revised Uniform Partnership Act, codified at RCW Chapter 25.05 (sections 25.05.005 et seq.). RCW 25.05.055 governs formation. No state formation filing required. Statement of partnership authority may be filed under state UPA. (consult the state code)
After formation the partnership has periodic filings to keep up. State partnership return administered by the state revenue department. Federal counterpart: IRS Form 1065. (consult the state code) $70
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Relevant Documents
For a Washington partnership the document stack runs from the agreement (private) through the state filings tied to Revised Uniform Partnership Act, codified at RCW Chapter 25.05 (sections 25.05.005 et seq.). RCW 25.05.055 governs formation: LLP registration 200; LP Certificate $180.00; the state partnership tax return State partnership return administered by the state revenue department. Federal counterpart: IRS Form 1065. (consult the state code); the periodic entity report $70; and the wind-up authority RCW section 25.05.300 (events causing dissolution)
Buy-Sell Agreement
A contract that outlines what happens to a partner's share of the business if they die, become disabled, retire, or wish to sell their interest in the partnership.
Partnership Agreement
A comprehensive contract that outlines the rights, responsibilities, and obligations of all partners, including profit sharing, decision-making authority, capital contributions, dispute resolution, and dissolution procedures.
Partnership Capital Contribution Agreement
A document that specifies the initial and ongoing capital contributions of each partner, including cash, property, services, or other assets.
Partnership Operating Procedures
An internal document that details day-to-day operations, management responsibilities, and standard procedures for the partnership business.
Relevant Laws
Washington Revised Uniform Partnership Act (RCW 25.05)
This is the primary law governing partnerships in Washington state. It covers formation, operation, partner relations, and dissolution of partnerships. Understanding this act is essential for anyone forming a partnership in Washington as it establishes the legal framework for your business structure.
Washington Business License Requirements (RCW 19.02)
This law requires all businesses in Washington, including partnerships, to register with the Department of Revenue and obtain a business license. You'll need to comply with these requirements when setting up your partnership.
Washington State Tax Registration Requirements (RCW 82.32.030)
Partnerships in Washington must register with the Department of Revenue for tax purposes. This law outlines the requirements for tax registration which is a crucial step in establishing your partnership.
Fictitious Business Name Laws (RCW 19.80)
If your partnership will operate under a name other than the legal names of the partners, you must file a business name registration (also called a 'doing business as' or DBA) under this law.
Washington Limited Liability Partnership Provisions (RCW 25.05.500-536)
If you're considering a limited liability partnership (LLP), these specific provisions within the Partnership Act outline the requirements and protections for LLPs in Washington, which provide liability protection that standard partnerships don't offer.
Regional Variances
Western Washington
Seattle has additional business licensing requirements for partnerships. Partnerships operating in Seattle must obtain a Seattle Business License Tax Certificate in addition to state requirements. Seattle also has its own business and occupation (B&O) tax system that differs from the state's B&O tax, requiring separate filing and compliance.
King County has specific zoning regulations that may affect partnerships operating in unincorporated areas. Partnerships should verify zoning compliance with the Department of Local Services, Permitting Division before establishing a business location.
Eastern Washington
Spokane requires partnerships to register with the city's tax and licensing department if operating within city limits, even for businesses based elsewhere. The city has its own business registration process separate from the state requirements.
Yakima County has specific regulations for agricultural partnerships, which are common in this region. Agricultural partnerships may qualify for special tax considerations and exemptions under local regulations.
Puget Sound Region
Tacoma imposes its own B&O tax on partnerships doing business in the city, with different rate structures than Seattle or the state. Partnerships must register with the city's tax and license division and file returns quarterly or annually depending on revenue.
Bellevue has streamlined business registration processes for partnerships through its business portal, but maintains strict compliance requirements for signage and home-based businesses that may affect partnership operations.
Suggested Compliance Checklist
Anchor the formation step to Washington's partnership code
Before formation days after startingRevised Uniform Partnership Act, codified at RCW Chapter 25.05 (sections 25.05.005 et seq.). RCW 25.05.055 governs formation.
Set partner-authority expectations in the partnership agreement
During drafting days after startingRCW section 25.05.100 (partner as agent).
If forming an LLP or LP, file the registration with the state
At formation days after starting200 $180.00
Calendar the state partnership tax return
After formation days after startingState partnership return administered by the state revenue department. Federal counterpart: IRS Form 1065. (consult the state code)
Track the entity-report deadline with the Secretary of State
Ongoing days after starting$70
Reference the statutory dissolution triggers in the agreement
During drafting days after startingRCW section 25.05.300 (events causing dissolution).
Keep the partnership agreement, statements, and filings together
Ongoing days after startingMaintain a single record set for the partnership agreement, any Statement of Authority, the SOS filings, EIN paperwork, and the annual report and tax filings.
| Task | Description | Document | Days after starting |
|---|---|---|---|
| Anchor the formation step to Washington's partnership code | Revised Uniform Partnership Act, codified at RCW Chapter 25.05 (sections 25.05.005 et seq.). RCW 25.05.055 governs formation. | - | Before formation |
| Set partner-authority expectations in the partnership agreement | RCW section 25.05.100 (partner as agent). | partnership-agreement | During drafting |
| If forming an LLP or LP, file the registration with the state | 200 $180.00 | - | At formation |
| Calendar the state partnership tax return | State partnership return administered by the state revenue department. Federal counterpart: IRS Form 1065. (consult the state code) | - | After formation |
| Track the entity-report deadline with the Secretary of State | $70 | - | Ongoing |
| Reference the statutory dissolution triggers in the agreement | RCW section 25.05.300 (events causing dissolution). | - | During drafting |
| Keep the partnership agreement, statements, and filings together | Maintain a single record set for the partnership agreement, any Statement of Authority, the SOS filings, EIN paperwork, and the annual report and tax filings. | partnership-agreement | Ongoing |
Frequently Asked Questions
Forming a general partnership in Washington has no state filing fee because no state filing is required to create one under the state partnership act (Revised Uniform Partnership Act, codified at RCW Chapter 25.05 (sections 25.05.005 et seq.). RCW 25.05.055 governs formation.). Registering an LLP or LP, however, does. LLP registration: 200 LP Certificate: $180.00
On a recurring basis in Washington, a partnership has two cost lines. State tax: State partnership return administered by the state revenue department. Federal counterpart: IRS Form 1065. (consult the state code) Periodic report: $70 When the partnership eventually winds up, the controlling statute is RCW section 25.05.300 (events causing dissolution).
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