California Proposition 40 Support Drops Below 50 Percent Pre-Election

Support for California's Proposition 40, which would impose a one-time 5 percent tax on residents with net worth exceeding $1 billion, has dropped below majority support in pre-election polling released October 28. The measure, which would make California the first U.S. state to directly tax accumulated wealth rather than income, now shows 47 percent support among likely voters, down from 54 percent in mid-September polling.

The ballot initiative targets an estimated 186 California residents who meet the net-worth threshold. At current valuations, the one-time levy would generate between $21.6 billion and $27.3 billion for the state, earmarked primarily for housing programs and climate infrastructure. The revenue projection assumes static domicile—a debatable assumption given Nevada's zero state income tax and Texas's constitutional prohibition on wealth taxation. The measure includes a 10-year clawback provision for residents who relocate within three years of the tax assessment, though enforcement mechanisms remain undefined in the ballot language.

The polling decline matters less for its predictive value than for what it signals about voter receptiveness to novel tax structures during periods of federal fiscal uncertainty. California already maintains the nation's highest marginal income tax rate at 13.3 percent. Adding a wealth-tax layer introduces valuation complexity that income taxation sidesteps—particularly for illiquid holdings in private companies, venture portfolios, and real estate partnerships. The initiative provides 18 months for the Franchise Tax Board to establish valuation methodologies, but offers no detail on dispute resolution for contested appraisals. Family offices with clients above the threshold have already begun restructuring trust domiciles and examining the constitutional questions around retroactive wealth assessment.

The measure's supporters include several progressive California legislators and national wealth-inequality advocates. Opposition has come from both predictable sources—business coalitions, taxpayer-advocacy groups—and less expected quarters. Former California Governor Jerry Brown, a Democrat, has declined to endorse the measure, citing concerns about revenue volatility and the precedent of taxing unrealized appreciation. That reluctance from a figure with significant party credibility has given cover to moderate Democrats who view the initiative as poorly timed.

Allocators and operators should watch three developments through early November. First, whether the No on 40 campaign increases television ad spending in the final two weeks—current expenditure sits at $18.4 million, below the $32 million spent opposing a similar measure in Colorado in 2020. Second, whether any of California's seven resident billionaires who have remained publicly silent issue statements in the final week, which historically moves late-deciding voters by 4-6 percentage points in tax-related ballot measures. Third, the November 5 vote outcome itself, which will be watched closely by legislators in New York, Illinois, and Washington state, all of which have explored parallel wealth-tax structures in the past 18 months.

If Proposition 40 fails, the conversation does not end. It recalibrates. The ballot's existence has already shifted the Overton window on what constitutes acceptable tax policy in high-net-worth jurisdictions. The next iteration will be narrower, the valuation mechanisms more defined, and the revenue targets more modest. The 47 percent support figure is not a repudiation—it is a negotiation in progress.