california prop 40: One-Time Wealth Tax on Billionaires for State Funding

What the measure proposes

California Prop 40 would impose a one-time 5% tax on the accumulated wealth of individuals and trusts whose assets exceed $1 billion, applied retroactively to residents as of January 1 2026. The tax would be due with the 2027 state tax filings, paid in five equal installments beginning that year, each installment subject to a 7.5% annual deferral charge on any unpaid balance.

Revenue allocation

The funds are earmarked for state health‑care programs, food‑assistance initiatives and public education, aiming to replace revenue lost after the 2025 federal tax legislation.

Fiscal impact and analysis

Proponents estimate the measure could generate roughly $100 billion over several years, while the California Secretary of State’s official analysis notes a temporary revenue increase of tens of billions of dollars and a possible ongoing decline of less than $1 billion per year in income tax revenue from billionaires. Opponents warn that the proposal would cost the state approximately $25 billion in lost revenue and create a loophole allowing the legislature to expand the tax without voter approval.

Key arguments

• Supporters say the tax addresses a funding gap caused by recent federal tax cuts and will improve health‑care access.
• Opponents argue the tax will reduce state revenue, create uncertainty, and allow the legislature to expand the tax without voter consent.

Supporters

Key supporters include U.S. Senator Bernie Sanders and the SEIU United Healthcare Workers West, who argue the tax is necessary to restore health‑care funding for millions of Californians.

Opponents

Opposition comes from groups such as the California Primary Care Association, the California School Boards Association, and the California Taxpayers Association, which contend the measure would damage the state budget, reduce resources for schools and health services, and lack accountability.

Election context

The proposition appears on the November 3 2026 ballot as a combined initiated constitutional amendment and state statute. Live updates from The Washington Post show ongoing voter activity, but final results have not yet been reported.

Conclusion

The debate centers on whether a targeted wealth tax can responsibly fund essential public services without jeopardizing California’s fiscal stability. Voters will decide the measure’s fate in the upcoming election.

Sources

California Secretary of State Voter Information Guide (2026); Ballotpedia (2026); The Washington Post (2026).