California’s proposed billionaire tax faced slipping odds and intensifying opposition in California on June 18, 2026, as a union-backed initiative raced toward a June 25 deadline to qualify for the November ballot. Despite more than 1.5 million signatures submitted, prediction markets lowered the chance of a vote to about 31%, down from roughly 90% at the start of the month, signaling waning confidence in the measure’s path forward.
The proposal matters because it would impose a one-time 5% levy on net worth above $1 billion, targeting roughly 200 residents and promising tens of billions for state programs. The tax has become a flashpoint for Gavin Newsom’s administration, business leaders, and labor groups, exposing divisions within the state’s Democratic coalition and intensifying debates over revenue stability, out-migration, and the risk of eroding California’s high-earner tax base. Last update: June 18, 2026.
Newsom-led opposition and ballot math
Gov. Gavin Newsom publicly opposed the California billionaire tax arguing the state already relies heavily on high earners and warning that an added levy could push wealth and investment out of California. In recent weeks, the governor and allies assembled a broad coalition of labor unions, health care organizations, and business groups urging proponents to withdraw the measure before the June 25 cutoff. While backers filed more than 1.5 million signatures—almost double the threshold—pressure to stand down escalated as qualification odds fell.
The initiative was sponsored by SEIU-UHW which maintained that support for the measure remains strong even as institutional leaders split. Polling in May showed roughly 50–54% of voters in favor in principle, but momentum softened after San Francisco voters rejected a separate high-earner tax, a result seen by strategists as a cautionary signal. With verification underway and only days remaining, the campaign’s immediate challenge is securing the ballot position amid rising resistance.
Wealth maneuvers and donor pushback
High-net-worth Californians intensified tax-minimization strategies as the initiative advanced. Reported moves included larger charitable donations to remain below the $1 billion threshold, restructuring private holdings, delaying funding rounds that could lift valuations, and adjusting real estate portfolios. Some considered purchasing high-value tangible assets—such as art and yachts—and keeping them out of state for at least 270 days per year, consistent with establishing residency elsewhere to legally sidestep the proposed levy.
The political fight drew direct spending from prominent billionaires opposed to the measure. Peter Thiel contributed $3 million to a statewide business group opposing the tax, while Eric Schmidt donated $1 million to allied efforts. Notable figures—including Larry Page, Sergey Brin, Mark Zuckerberg, and Peter Thiel—have moved residences or parts of their businesses out of California, developments cited by critics who warn that a new wealth tax could accelerate capital flight just as the state navigates budget pressures.
Supporters framed the proposal as a targeted way to raise substantial revenue for health care education, and food assistance without burdening lower-income residents. They argued that a one-time 5% assessment on the ultra-wealthy would diversify funding and stabilize essential services, especially during economic volatility. Opponents countered that the policy could depress investment and entrepreneurship, with even a single-year levy influencing long-term domicile decisions and asset allocations among top taxpayers.
Public sentiment remained mixed. While topline polling showed about half of voters supportive, the softening trajectory—reflected in the 31% prediction-market odds—mirrored the impact of the governor’s efforts and recent local tax votes. The immediate waypoint is the June 25 deadline for signature verification and any potential withdrawal decision by SEIU-UHW. If validated and kept on the ballot, the initiative would set up a closely watched statewide fight in November; if not, the episode will still shape California’s approach to taxing extreme wealth and the strategies of residents preparing for future proposals.
