Will a state personal income tax become law in Washington before Apr 1, 2026?

The Washington State Legislature adjourned its 2026 regular session on March 12, 2026, without passing any legislation to establish a personal income tax. Under the state constitution, the Governor has 20 days (excluding Sundays) to sign bills passed in the final five days of the session; however, no personal income tax bill (such as the perennial Wealth Tax HB 1473) successfully cleared both chambers before the deadline. Washington's constitutional framework remains a formidable barrier, as the State Supreme Court's 1933 ruling in Culliton v. Chase continues to classify income as property. This classification requires any such tax to be uniform and capped at 1%, a restriction that has historically deterred the Democratic majority from pursuing a traditional personal income tax without a constitutional amendment. Political incentives in an election year further suppress the likelihood of a late-session surprise. With the 2026 midterms approaching, passing a broad-based income tax—a policy Washington voters have rejected at the ballot ten times since 1934—would be a high-risk maneuver that no major legislative leader has signaled support for in recent months.

The legal definition of a personal income tax in Washington has become increasingly blurred following the 2023 Quinn v. Washington decision, which upheld the Capital Gains Tax as an excise tax. If the legislature passed a narrowly tailored 'Wealth Tax' or 'High-Earners Tax' in the final hours of the session that is technically structured as an excise tax but meets the market's definition of a tax on individual residents, a surprise signing before April 1 remains a tail risk. A special session could theoretically be convened by Governor Bob Ferguson to address an unforeseen budget shortfall or emergency revenue need. While no such crisis has been reported as of March 27, 2026, the Governor retains the authority to call legislators back to Olympia and sign emergency legislation into law within a 24-hour window. There is a marginal possibility that existing legislation, such as a modified version of the Working Families Tax Credit or a local-option payroll tax, could be legally reinterpreted or expanded in a way that triggers the market's resolution criteria. If a court or administrative body issued a clarifying rule before April 1 that effectively established a new tax obligation on personal income, the market could resolve Yes.