Proposition 43 on California's November 2026 ballot would amend the state constitution to impose a two-thirds voter approval requirement on citizen-initiated local special taxes, matching the existing threshold for governing-body proposals and closing certain loopholes from prior court rulings. The measure emerged from a legislative compromise tied to other tax and housing proposals, with backing from groups like the Howard Jarvis Taxpayers Association and opposition from local governments and taxpayer associations wary of reduced revenue flexibility. No recent statewide polls have shifted the outlook dramatically, and the November timeline leaves room for campaign developments or turnout patterns typical of tax-related ballot measures. Trader pricing at roughly 35% implied probability for passage aligns with historical difficulty for such supermajority expansions amid competing fiscal priorities.