Washington’s Proposed Millionaires’ Tax: 2026 Update and Legal Analysis
Posted: 3/6/2026 Updated: 4/9/2026 Governor Ferguson signed SB 6346 into law on March 30, 2026, making Washington the first state in nearly a century to enact a broad-based personal income tax. Legal challenges are already underway, and a separate effort to place a repeal measure on the November 2026 ballot is in progress. We will…