Washington voters will decide Initiative 645 on the November 2026 ballot after the measure qualified in mid-September following submission of over 500,000 signatures. The initiative would repeal the 9.9% tax on household income above $1 million enacted by Senate Bill 6346 and signed by Governor Bob Ferguson in March 2026, with collections scheduled to begin in 2029. Democratic leaders, organized labor, and opponents have launched coordinated campaigns framing repeal as a threat to K-12 education, higher education, healthcare, and small-business relief funded by the projected $3 billion in annual revenue. Supporters led by Let’s Go Washington argue the tax risks future expansions and undermines the state’s no-income-tax tradition. Ongoing legal challenges and the measure’s narrow focus on high earners contribute to trader expectations that the repeal will fail.