**Proposition 43**, a legislatively referred constitutional amendment on California's November 2026 ballot, would require a two-thirds voter threshold for citizen-initiated local special tax measures (extending or increasing dedicated taxes) beginning January 2027, aligning them with the existing supermajority rule for government-referred taxes and closing court-created exceptions under Proposition 13. Placed on the ballot in late June 2026 through a legislative deal, the measure is backed by the Howard Jarvis Taxpayers Association and Reform California as a taxpayer protection. Opposition from groups such as Evolve California and some Democratic legislators frames it as restricting local funding flexibility for services like transit, education, and public safety, potentially allowing a minority of voters to block initiatives. With limited early polling and campaign spending data available as of mid-August, trader consensus favoring rejection reflects California's broader electoral dynamics, where measures perceived to constrain revenue face resistance amid ongoing demands for local government resources. No major late-breaking developments have shifted positioning in recent weeks.