California’s Proposition 40 would establish the nation’s first wealth tax specifically aimed at billionaires, imposing a one-time 5% tax on their net worth. The measure applies retroactively to anyone who was a California resident on January 1, 2026, with revenue designated primarily for low-income healthcare programs. The initiative represents a significant policy shift in a state historically known for its 1978 tax revolt.
Economist Gabriel Zucman of UC Berkeley and the Paris School of Economics has co-authored analysis projecting the tax could generate approximately $100 billion in revenue. His research indicates that California billionaires accumulated $2.3 trillion in wealth by mid-2026, with their fortunes expanding 144% between 2023 and 2025 largely due to artificial intelligence sector growth. Zucman argues that billionaires effectively avoid substantial income taxes through financial structuring, making a wealth tax necessary to address inequality and fund public services.
Stanford economist Joshua Rauh and co-author Benjamin Jaros reach opposite conclusions. They contend the tax would trigger significant billionaire migration out of California, ultimately costing the state $39 billion by reducing income tax revenue collected from wealthy residents. Rauh disputes Zucman’s assumption that only 10% of billionaires would avoid or evade the tax, suggesting this figure is unrealistically low.
The debate carries implications beyond California. Wealthy individuals have contributed $333 million to opposition efforts, recognizing that a successful California implementation could inspire similar policies nationally and internationally. The wealth tax would function similarly to property taxes but would extend to stocks, artwork, yachts, and other assets owned by billionaires, with valuation methodology representing a significant implementation challenge despite most billionaire wealth being held in easily-valued publicly traded securities.
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