Washington State's 10% Aircraft Luxury Tax Combined with 9.9% Millionaire Tax Creates the Nation's Harshest Tax Burden — 17% of In-State Businesses Consider Relocating, Business Jet Registration and Based Assets Face Systemic Outflow Risk

Washington State's 10% aircraft transaction luxury tax passed last year has already triggered a repeal proposal (HB 1890), while the state's newly enacted 9.9% millionaire income tax pushes Seattle's combined top rate above 18% (the nation's highest). A Washington Business Association survey shows 17% of employers are considering relocation (up from just 9% last year, nearly doubling). Uber co-founder Kalanick and other executives have already left or are considering leaving. Direct impact on business aviation: a $50 million business jet transaction in Washington State incurs an additional $5 million luxury tax, while neighboring Oregon, Montana, or Idaho offer complete avoidance. Boeing Field (KBFI) as Seattle's core business aviation hub depends heavily on local tech executives; the outflow of wealthy residents will directly erode based aircraft numbers and FBO revenue. The HB 1890 repeal process is the key variable. Confidence: ★★ (KG multiple independent news cross-verification; lacking KBFI specific traffic data).