VOTEWIRE ANALYSIS
Proposition 40 would take a one-time 5 percent cut of billionaires' wealth and send 90 percent of it to health care — and the fight over it is really a fight over whether extreme wealth can be taxed at all.
Start with what the measure actually does. Proposition 40, the 2026 Billionaire Tax Act, is a one-time tax, not an annual one. It applies to people who were California residents on January 1, 2026, and whose net worth on December 31, 2026 is $1 billion or more. The rate phases in from zero at $1 billion to the full 5 percent at $1.1 billion and above; a married couple counts as one taxpayer, and worldwide assets count. Homes held directly or in a revocable trust are excluded, as are qualified pensions and most retirement accounts. The tax would be reported with 2026 income taxes, or paid over five years plus a 7.5 percent yearly charge.
That design answers a decade of failed attempts. Lawmakers tried an annual wealth tax in 2020 and again in 2024, and both bills died in the Legislature. So the idea went straight to voters instead, narrowed to billionaires only and built to survive the obvious escape hatch: residency is fixed on a date that has already passed, and gifts over $1 million made after October 15, 2025, and transfers to non-grantor trusts in 2025 and 2026, are largely pulled back into the count.
Where the money goes is the second half of the argument. The Legislative Analyst estimates the state would probably collect tens of billions of dollars, spread over several years, split 90 percent to a health account and 10 percent to education and food assistance — and exempt from the state spending limit and the school funding guarantee. Supporters, led by SEIU-United Healthcare Workers West with Planned Parenthood of Pacific Southwest and a teachers local, say the tax would replace federal health care funding cuts, and that billionaires pay lower effective tax rates than working families. For a home health aide or a Medi-Cal patient, that is not an abstraction: it is whether the clinic stays open when Washington pulls back.
The opposition is arguing about power, and spending accordingly. The argument against is signed by the presidents of the California Medical Association and the California School Boards Association and the CEO of the California Primary Care Association, and it lists Governor Gavin Newsom among opponents. Opponents say the tax would drive wealthy residents and companies out of state and cost the state revenue over time. As of October 9, campaign finance records showed $32.3 million from the top ten donors to the main committee supporting Prop 40, almost all from SEIU-United Healthcare Workers West — against $88.5 million from Building a Better California, whose listed top donors are Sergey Brin and L. John Doerr III, to the main committee opposing Prop 40, plus $58.35 million for Prop 41 and $97.8 million for Prop 42.
That is the trap built into this ballot. Propositions 41 and 42 are competing measures: Prop 41 would require audits of programs funded by new special taxes, and Prop 42 would prohibit new state taxes on the ownership of financial assets and limit retroactive taxes. Each says that if it receives more yes votes than Prop 40, courts could find it blocks Prop 40 from taking effect — even if Prop 40 itself passes. A voter can say yes to taxing billionaires and still wake up to a legal fight over whether that yes counts.
September polls put support at 52 percent in one survey and 45-43 in another. Whatever California decides on Tuesday, the rest of the country should read it as a test of one question: when a handful of fortunes grows larger than the budgets that fund care, schools, and food, who writes the rules — the voters, or the wealth itself? California voters get the first word. The money, the courts, and the other 49 states will have the next ones.