California Proposition 43 would require a two-thirds vote for citizen-initiated local special taxes starting in 2027 while barring certain property-related taxes through the initiative process, maintaining the existing two-thirds threshold only for government-proposed measures. The measure emerged from a June 2026 legislative compromise that removed a broader anti-tax initiative backed by the Howard Jarvis Taxpayers Association. Opponents, including public employee unions and local government groups, argue it would constrain funding for services such as schools, transit, and infrastructure. Supporters emphasize consistency with Proposition 13-era protections and limits on majority-vote tax hikes. The narrow trader edge for rejection reflects organized opposition strength and typical voter reluctance to raise approval thresholds, though outcomes could shift with polling trends, campaign spending, or voter responses to concurrent local tax measures ahead of the November 3 election.