California Proposition 43 would raise the voter approval threshold for citizen-initiated local special taxes from a simple majority to two-thirds starting in 2027, aligning them with government-referred measures under longstanding constitutional rules. The measure emerged from a June 2026 legislative compromise that removed a broader anti-tax initiative from the November 3 ballot. Trader pricing remains closely balanced because organized opposition from local governments, public employee unions, and service advocates highlights risks to funding for schools, housing, and infrastructure, while taxpayer groups emphasize restoring Prop 13-era protections and closing court-created loopholes. Recent ballot activity showing hundreds of local tax measures in the same election could influence turnout and framing. Late campaign spending, endorsements from city leaders, or polling shifts on revenue needs represent the main variables that could move the outcome before election day.