What to know about Prop 40

Key Points:

• California's Proposition 40 proposes a one-time 5% wealth tax on residents with net worths above $1 billion, aiming to raise tens of billions for healthcare programs impacted by federal cuts, with polls showing a narrow lead but prediction markets favoring defeat.
• Supporters estimate the measure could generate around $100 billion, while critics warn that billionaire migration out of California could offset revenues and harm the state's long-term tax base, a concern echoed by Governor Gavin Newsom and other Democrats.
• Valuation complexities of illiquid assets and potential legal challenges are significant issues, though proponents argue the tax is administratively feasible and targets wealth not captured by existing income taxes.
• High-profile billionaires like Sergey Brin oppose the measure and have heavily funded the "No" campaign, while some CEOs, including Nvidia’s Jensen Huang, support the tax as a privilege; debates continue over the measure's permanence and impact on California's economy.
• Proposition 40 faces competing ballot measures (Props 41 and 42) that could block its implementation, with ongoing political and public debates reflecting deep divisions over taxing extreme wealth at the state level.