Odds that a proposed billionaire tax appears on California ballots plunge on prediction markets

• The tax would affect approximately 200 Californians worth over $1 billion, who collectively hold $2 trillion in wealth, with revenue intended to support the state's healthcare system after federal funding cuts
• The Service Employees International Union submitted more than 1.5 million voter signatures, well above the required 875,000, demonstrating significant grassroots support for the measure
• Newsom's opposition comes as he considers a presidential run, with the governor recently accusing President Trump of targeting him for investigation due to his political ambitions

Summary: California Billionaire Tax Ballot Prospects Decline Sharply

Key Development

Prediction market platform Kalshi shows the probability of a proposed California billionaire tax appearing on November's ballot has plummeted from 88% to 35.5% over the past week. The dramatic shift follows reports that Governor Gavin Newsom is actively working to prevent the measure from reaching the ballot before the June 25 deadline.

Proposal Details

The billionaire tax initiative, backed by the Service Employees International Union – United Healthcare Workers West, would impose a one-time 5% tax on net worth for individuals with wealth exceeding $1 billion. The measure would affect approximately 200 Californians holding combined wealth of $2 trillion. Proceeds would support California's healthcare system amid federal funding cuts.

Political Context

The union submitted over 1.5 million voter signatures—significantly exceeding the required 875,000—demonstrating substantial grassroots support for the initiative. Despite this backing, Newsom's opposition appears linked to his consideration of a presidential run. The governor recently accused President Donald Trump of directing IRS investigations against him and his wife, claiming the targeting stems from his presidential aspirations.

Market Implications

The sharp decline in prediction market odds suggests reduced likelihood of California implementing significant wealth taxation in the near term. This development may influence investment and residency decisions among ultra-high-net-worth individuals in California. The outcome could also set precedent for similar wealth tax proposals in other states and impact broader discussions about progressive taxation during the presidential election cycle.

The June 25 deadline represents a critical juncture for the measure's future.