Stanford University intelligence

California billionaire tax may shrink state revenue, Stanford finds

October 20, 2026 · Updated October 22, 2026 · Curated by 247ignite
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California billionaire tax may shrink state revenue, Stanford finds

InvestmentNews

Stanford economists estimate that California's proposed Proposition 40 wealth tax could generate $30 billion, far below the $100 billion projected by proponents. The study attributes the shortfall to billionaire relocations, which have already removed $540 billion in wealth from the state. Additionally, the tax could reduce annual income tax revenues by up to $3.5 billion.

The research, released weeks before the vote, highlights the challenges of taxing highly mobile ultra-wealthy individuals and raises questions about the long-term fiscal impacts of such policies.

Investment implication: This study underscores Stanford’s role in shaping economic policy debates. For you, it highlights the fiscal risks tied to wealth mobility and the potential impact on California’s economic stability.

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