Top image: The California State Capitol in Sacramento, viewed from Capitol Mall. Photo: Tony Webster from Minneapolis, Minnesota, United States / CC BY-SA 2.0 via Wikimedia Commons

Most of the tax measures on Silicon Valley ballots this fall ask voters to decide what to fund. Proposition 43 asks a different question: how many votes it should take to fund anything through a citizen petition.

The legislative constitutional amendment would require that “any new, increased, or extended local special taxes proposed by voters” win a two-thirds vote, beginning Jan. 1, 2027, according to the Legislative Analyst’s Office analysis. Today, special taxes placed on the ballot by a city council or county board already need two-thirds. But “recent court decisions have allowed special taxes that are proposed by voters to be approved with a majority vote,” the LAO writes. Prop. 43 would end that distinction.

How we got here

For roughly two decades after Proposition 218 in 1996, most observers assumed every local special tax needed two-thirds approval. The California Supreme Court unsettled that in 2017 in California Cannabis Coalition v. City of Upland, holding that procedural limits on local governments do not automatically bind voters acting by initiative, and lower courts then upheld citizen special taxes that passed by simple majority, according to Stanford’s Hoover Institution in its Proposition Lab guide.

Prop. 43 is the product of a deal. The Legislature placed Assembly Constitutional Amendment 22, authored by Assemblymember Buffy Wicks (D-Oakland), on the ballot on June 25, 2026, and in exchange the Howard Jarvis Taxpayers Association withdrew a broader initiative it had already qualified, Hoover reports. That withdrawn version would also have restricted some charter-city real estate transfer taxes and reached back to invalidate certain existing taxes; Prop. 43 applies only going forward. Hoover notes that Wicks has since said she opposes the measure. The amendment also bars local governments, including voters acting by initiative, from imposing property taxes beyond the limits already in the state constitution.

The LAO’s fiscal summary is short: local tax revenues “could be lower in the future than they otherwise would be,” with the actual impact “unknown.”

Who is paying

The money is lopsided toward the yes side at the top. The 10 largest contributions to committees formed for Prop. 43 include seven from the California Business Roundtable Issues PAC totaling about $7.9 million, plus $500,000 contributions from Douglas Emmett Properties affiliates and Kilroy Realty, according to the Secretary of State’s Quick Guide to Propositions. The largest gifts to the no side come from labor and allied committees, including $1,066,000 from the committee opposing Proposition 39 and $1.5 million in two contributions from the SEIU California State Council.

“Courts have allowed special interests to pass earmarked tax increases with fewer votes. Prop. 43 closes this loophole, protecting taxpayers, homeowners and renters,” the official argument in favor says. Opponents counter that it “lets just 33.4% of voters veto what nearly 67% want.”

Where the Valley stands

Local governments in the region have weighed in against it. San Mateo County’s Board of Supervisors adopted a resolution opposing Prop. 43 on Oct. 6 after County Executive Michael Callagy and Chief Legislative Officer Connie Juarez-Diroll wrote that it could reduce county revenues over time by making it harder to establish or extend voter-approved local taxes, The San Mateo Record reported. Palo Alto’s City Council voted Oct. 5 to oppose it, Palo Alto Online reported.

The clearest local example of the path Prop. 43 targets is on this same ballot. Measure RTM, the regional transit sales tax, reached voters by citizen petition and needs only a simple majority across the five-county district, according to the GrowSF voter guide; Caltrain’s own funding page also describes it as a citizens’ initiative that would take effect “if approved by a majority of voters.” Prop. 43’s rule begins Jan. 1, 2027. Because it also covers taxes that are “extended,” any future attempt to renew a voter-initiated special tax of this kind, including a successor to RTM when its 14-year term ends, would face the two-thirds bar if Prop. 43 passes.

What Prop. 43 would not touch is just as important. Palo Alto’s Measure J, for example, is a general sales tax placed on the ballot by the City Council, and it needs a simple majority under existing rules. Prop. 43 applies only to special taxes proposed by voters.

The long view

The citizen initiative has become a practical tool for regional coalitions of transit agencies, housing advocates, labor and, increasingly, business and tech donors to pass earmarked taxes that elected bodies could not or would not put forward at a two-thirds threshold. Prop. 43 would not end that strategy, but it would change the arithmetic: a measure would need to persuade two of every three voters, not one of two.

For Silicon Valley, where funding for transit, housing and health care increasingly depends on multi-county measures, the vote is less about any single tax than about who gets to set the region’s fiscal agenda when Sacramento and city halls stall. A yes vote favors consistency and a higher bar for earmarked taxes; a no vote preserves a route that has become central to how the Bay Area finances itself.

Sources

• Proposition 43 analysis, Legislative Analyst’s Office
• Quick Guide to Propositions: Proposition 43, California Secretary of State
• Proposition Lab: Proposition 43, Hoover Institution
• San Mateo County tightens affordable housing rules, The San Mateo Record, Oct. 9, 2026
• Around Town: A measure of support, a new partner, Palo Alto Online, Oct. 18, 2026
• Regional Measure RTM, GrowSF Voter Guide
• Caltrain Budget Deficit, Caltrain
• Measure J, California Choices