California Proposition 43 would amend the state constitution to require a two-thirds voter approval for all local special tax measures, including those advanced through citizen initiative petitions, which currently need only a simple majority under recent court interpretations. The legislatively referred measure reached the November 3, 2026 ballot via a June 2026 compromise after a broader tax-limitation initiative was withdrawn. With three months until the election and no major polling shifts or endorsements reported, trader consensus at 64.5% for rejection reflects California’s Democratic-leaning electorate and historical patterns of voter resistance to additional supermajority barriers on local revenue tools. Local governments and service advocates have highlighted potential funding constraints for transportation, education, and public safety measures, while taxpayer groups back the change to align initiative-driven taxes with existing government-referred thresholds.