California’s Billionaire Wealth Tax Initiative Faces Voters

Proposition 40, on the November 3 ballot, would impose a one-time 5 percent tax on the net worth of any California resident whose assets exceed $1 billion as of Jan. 1 2026. The revenue is earmarked primarily for Medi-Cal, with 10 percent allocated to food-assistance and education. Payments could be spread over five years; real estate, pensions and certain retirement accounts are excluded from the valuation.

LAistCapital & MainNew York MagazineBillionaires won’t be the ones most affected by Prop 40’s tax. Californians will ReasonFortune Magazine

The measure is sponsored by the Service Employees International Union-United Healthcare Workers West (SEIU-UHW) and backed by the California Democratic Party, the California Nurses Association, and several progressive politicians. It was introduced to offset funding cuts to Medicaid and other low-income programs created by the federal One Big Beautiful Bill Act (signed July 4 2025).

New York Magazine

• Jan 1 2026 – Retroactive residency date.

Billionaires won’t be the ones most affected by Prop 40’s tax. Californians will

• Sept 4–10 2026 – PPIC poll: 52 % support, 46 % opposition.

New York Magazine

• Sept 20 2026 – Reuters notes uncertain prospects.

New York Post

• Nov 3 2026 – Voters decide on Prop 40 and related measures.

New York Magazine

• About 200–250 California billionaires hold roughly $2.3 trillion in wealth.

Fox Business (website)

• Proponents project $100 billion in revenue over five years; skeptics estimate $35 billion–$46 billion after accounting for billionaire flight.

Billionaires won’t be the ones most affected by Prop 40’s tax. Californians will

• A Hoover Institution study cites $536 billion of billionaire wealth that left the state before the Jan. 1 2026 cutoff.

Billionaires won’t be the ones most affected by Prop 40’s tax. Californians will

• Gov. Gavin Newsom (D) opposes Prop 40, preferring a nationwide federal wealth tax.

New York Magazine

• Rep. Ro Khanna (D-CA) supports the measure to preserve health-care funding, noting he does not want illiquid stakes taxed.

LAist

• SEIU-UHW estimates the initiative would raise $100 billion for health, food and education programs.

Capital & Main

• The California Teachers Association has expressed reservations about a potential loss of tax base.

LAist

• Sergey Brin, Google co-founder, warned the tax could push California toward “the same place” as the Soviet Union, citing his family’s experience fleeing socialism.

Reuters

• Critics say the tax could reduce opportunities for workers.

A 5 Percent Wealth Tax Would Destroy a Lot More Than It Raises

• Business analysts note the tax could prompt legal challenges, especially from billionaires who left before the Jan. 1 2026 cutoff.

Fox Business (website)

• Revenue projections diverge sharply: proponents cite $100 billion, while analysts at the Legislative Analyst’s Office and the Hoover Institution forecast $35 billion–$46 billion after flight adjustments.

Billionaires won’t be the ones most affected by Prop 40’s tax. Californians will

• Estimates of the billionaire count range from “about 200” to “250,” affecting the tax base calculation.

A 5 Percent Wealth Tax Would Destroy a Lot More Than It Raises

• No definitive data exist on how many billionaires will actually be subject to the retroactive provision, creating uncertainty about the final fiscal impact.

Billionaires won’t be the ones most affected by Prop 40’s tax. Californians will

Voters will cast ballots on Nov 3, deciding not only Prop 40 but also Prop 41 and Prop 42, which could nullify the wealth tax if they receive more votes. Legal challenges are expected from billionaires who left the state before the Jan. 1 2026 cutoff, and the Legislative Analyst’s Office has signaled that any revenue shortfall from behavioral responses could be less than $1 billion per year. The outcome will shape California’s health-care financing and may influence wealth-tax debates nationwide.

Fortune Magazine