California Proposition 43 would amend the state constitution to require a two-thirds voter approval threshold for citizen-initiated local special taxes starting in 2027, aligning them with governing-body referrals and adding restrictions on certain property taxes. Legislative referral of the measure in late June 2026 emerged from a compromise that withdrew a more stringent citizen initiative, yet the bill's author and several Democratic legislators have since opposed it. Organized opposition from labor unions, transit advocates, local officials, and groups such as Evolve California emphasizes risks to funding for services including fire protection and infrastructure. Early polling from the Public Policy Institute of California shows roughly 39 percent support among likely voters, with sharp partisan splits, sustaining trader expectations that the proposition will fail on the November ballot.