Archive · 28 Sep 2026
California’s Billionaire Tax Fight Could Set National Precedent
California voters will decide whether to make billionaires pay a special one-time tax based on their wealth.
The tax could be as high as 5% for billionaires who lived in California on January 1, 2026.
Most of the money would go to healthcare.
Some money would also support education and food assistance.
Two other ballot measures could stop the tax from taking effect, even if more voters support it.
Supporters say the tax could raise a large amount of money for public services.
Opponents say wealthy people might leave California or change their investments.
California officials and researchers disagree about how much money the tax would raise.
The vote could show other states whether taxing billionaire wealth is practical.
Proposition 40 would impose a one-time tax of up to 5% on qualifying billionaires who lived in California on January 1, 2026.
The proposal would direct 90% of its revenue to healthcare and the remaining 10% to education, food assistance and administration.
Propositions 41 and 42 could prevent Proposition 40 from taking effect if courts determine that the measures conflict.
Supporters forecast roughly $100 billion in revenue, while critics estimate the total could be closer to $40 billion.
The measure could test whether states can tax accumulated billionaire wealth and may influence similar efforts nationwide.
- Who
- California voters, qualifying billionaires, supporters, opponents, and state officials are involved.
- What
- Voters will decide on Proposition 40, a proposed one-time tax of up to 5% on the net wealth of certain billionaires, alongside Propositions 41 and 42.
- When
- The vote is scheduled for November 3, 2026; the tax would be due in 2027, with payments potentially spread over five years.
- Where
- California.
- Why
- The proposal aims to raise money primarily for healthcare, while the broader ballot fight could determine whether a state can tax accumulated billionaire wealth.
Supporters of Proposition 40
Opponents of Proposition 40
Public revenue
Supporters of Proposition 40
Supporters say the tax could raise around $100 billion for healthcare, education and food assistance.
Opponents of Proposition 40
Critics estimate the measure could raise closer to $40 billion and warn that taxpayer responses could reduce the expected benefit.
Economic effects
Supporters of Proposition 40
Emmanuel Saez argues that California’s universities, infrastructure, research base and talent would continue attracting companies and entrepreneurs.
Opponents of Proposition 40
Opponents say wealthy residents could leave, change investments or otherwise reduce their taxable exposure, potentially weakening future income-tax revenue.
National significance
Supporters of Proposition 40
Supporters view the measure as a test of whether states can tax accumulated billionaire wealth rather than only income.
Opponents of Proposition 40
Opponents may use a failure, legal challenge or limited revenue outcome to argue against similar state-level wealth taxes.
- Election date
- November 3, 2026
- Proposed tax
- A one-time tax of up to 5% on the net wealth of qualifying billionaires who lived in California on January 1, 2026
- Revenue allocation
- 90% for healthcare; 10% for education, food assistance and tax administration
- Revenue estimates
- Supporters cited an estimate of about $100 billion; critics have estimated about $40 billion
- Potential effects
- The Legislative Analyst’s Office warned that some wealthy residents could leave or alter their taxable income, potentially reducing annual income-tax revenue by less than $1 billion
- Related measures
- Propositions 41 and 42 could block Proposition 40 if a court finds that the measures conflict
- Political support and opposition
- Governor Gavin Newsom opposes Proposition 40; supporters include Senator Bernie Sanders and the Service Employees International Union-United Healthcare Workers West