Billionaire one-time wealth tax passes in California election 2026?

Logged 30 Oct 2026, 14:00 UTC

• The qualifying condition is fully satisfied: Proposition 40, a one-time 5% tax on California-resident billionaires, is already on the November 3, 2026 ballot and needs only a simple majority, so the question reduces entirely to whether it wins the vote.
• Signal: the Yes campaign is well funded at ~$33M, and a billionaire-only tax is a populist, narrowly-targeted measure in a strongly Democratic state, which historically polls better than broad tax increases — this pushes above the generic tax-initiative base rate.
• Counter-signal: competing Propositions 41 and 42 on the same ballot contain provisions that would invalidate Prop 40; split or confused voting on rival measures and the likely well-funded opposition they represent materially reduce Prop 40's chances of prevailing.
• The absence of any recent public polling five days before the election means I cannot anchor on voter intent; with no poll, I stay close to the base rate and keep confidence low rather than following the funding narrative.
• As a constitutional amendment plus statute, Prop 40 faces California voters' historical skepticism toward complex ballot-box constitutional changes, another mild drag consistent with the base rate.

What would change it: A late, credible statewide poll showing Prop 40 support well below 50% (or Props 41/42 with majority support) would push my estimate down toward 0.25 or lower.

+10.3 probability points from the market at generation · low confidence · Polymarket

Base rate: Roughly one-third to two-fifths of California statewide initiatives have historically passed, with tax-raising measures landing toward the lower-middle of that range (~35%); this is from my knowledge of the class, as no retrieved fact provides a pass-rate statistic.

Chosen by Crossbook's published selection rule (auto-v2), not by hand.

Formed blind at 43.0%, without sight of the price; published at 32.8%, the market’s 22.5% moved 50% of the way toward it by fixed rule. None of the cited facts could be shown to be one the market had not already priced. That check is recorded, not enforced.