12/16/2025
Washington State's 2026 tax law updates. Key updates for 2026 include:
Business and Occupation Tax
• Surcharge on High-Grossing Businesses: A new, temporary 0.5% B&O tax surcharge applies to the portion of a business's Washington taxable income that exceeds $250 million annually. This is in addition to existing B&O taxes.
• Advanced Computing Surcharge Increase: The surcharge for select advanced computing businesses (those in affiliated groups with over $25 billion in worldwide revenue) has increased significantly from 1.22% to 7.5% of gross income, with the annual cap raised to $75 million.
• Payment Processing Services: A new B&O tax classification has been created for certain payment processors, taxed at a rate of 3.1%.
• Investment Income Deduction Clarification: New rules clarify that investment income is generally deductible if it's incidental to the main business purpose, specifically if total worldwide investment income is less than 5% of total worldwide gross income.
• Expanded Voluntary Disclosure Program: The state offers a temporary voluntary disclosure program for entities with B&O tax liabilities from investment activities (that are not banking, lending, or securities businesses), allowing for the waiver of penalties and interest for qualifying applicants.
Sales and Use Tax Changes
• Luxury Vehicle Tax: An additional 8% tax is now imposed on the portion of the sale, lease, or transfer price of a motor vehicle that exceeds $100,000.
• Aircraft and Watercraft Taxes:
• An additional 10% tax applies to noncommercial aircraft sales or leases exceeding $500,000, effective April 1, 2026.
• A new 0.5% sales tax applies to recreational vessels at purchase or lease, effective July 1, 2026.
• Tire Fee Increase: The fee on the sale of new motor vehicle tires increased to $5 per tire (previously $1).
• Car Rental Tax Increase: The rental car sales tax rate increased to 11.9% in 2026.
• Existing Contracts for Services: For services newly subject to sales tax in late 2025, sellers with existing contracts that were not materially changed can delay collecting sales tax until April 1, 2026.
Other Updates
• Minimum Wage Increase: Washington's minimum wage increased to $17.13 per hour starting January 1, 2026.
• To***co Products Tax Expansion: The definition of "to***co products" for tax purposes has expanded to include all products containing ni****ne, whether derived from to***co or synthetic, effective January 1, 2026.