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Billionaire one-time wealth tax passes in California election 2026?

Billionaire one-time wealth tax passes in California election 2026? Where the market stands, how it has moved and how this market resolves.

25% Market-implied probability down 3 pts

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Editorial analysis

The Sweat's View

The number reflects a structure as much as a poll. Polls so far show Proposition 40 ahead, but by margins from 3 to 10 points, and two countermeasures on the same ballot can stop it taking effect even if it wins a majority. So the question is less whether voters like the tax than whether it out-polls Propositions 41 and 42. Watch the gap between support in polls and the final vote, and how the two countermeasures are described to voters.

Market Split

25%
  • Yes25%
  • No76%

The market's probability for this question, split between Yes and No.

How the Market Has Moved

  • Oct 9 No rose 4 points, from 71% to 75%.
  • Oct 9 Yes fell 4 points, from 29% to 25%.

The Market in Brief

The market currently puts this at 25%. The market has 3.9M in volume. It is expected to resolve on November 3, 2026.

The Case For

  • No, the market's leading outcome, is helped by two rival measures on the same ballot. If Proposition 41 or Proposition 42 gets more votes than Proposition 40, the billionaire tax does not take effect, and a September PPIC poll had 51% of likely voters backing 41 and 54% backing 42. CalMatters / ABC7 San Francisco
  • Opposition is well funded and includes the governor. Building a Better California has raised more than $187 million against Proposition 40 and for the two countermeasures, and Gov. Gavin Newsom opposes the tax. CalMatters
  • Support is not a clear majority in every poll. A Berkeley IGS/Los Angeles Times poll published in late September found 45% in favor, 42% opposed and 13% undecided. ABC7 Los Angeles

The Case Against

  • Several recent polls show Yes ahead. An NBC News/Telemundo poll of likely voters on September 21 to 24 found 48% for and 38% against, with a margin of error of plus or minus 4 points, and PPIC found 52% for and 46% against. NBC News
  • Backers are organized and funded. The measure would levy a one-time 5% tax on residents worth more than $1 billion, supporters have raised about $31 million, mostly from SEIU-UHW, and the California Democratic Party supports it. CalMatters

What to Watch

  • Election Day November 2, 2026 Voters decide Proposition 40 alongside Propositions 41 and 42. What matters is the vote count for each of the three, not only whether 40 gets a majority. Source
  • New public polling The latest polls we found are from late September and disagree on the size of the lead. Another PPIC or Berkeley IGS release would show whether support is holding as campaign spending grows.

This page describes what the market on Polymarket currently implies. It is not a forecast by The Sweat.

Current Probability

Yes

25%

Market-implied probability

  • 24 hours down 3 pts

Source

Single source

Key facts

Ends
November 3, 2026 25 days left
Volume
3.9M

Probability History

Outcomes Market-implied probability

  1. No 76% 24 hours: up 3 pts
  2. Yes 25% 24 hours: down 3 pts

Each option is priced on its own, so these may not add up to 100%.

How It Resolves

A one-time wealth tax on billionaires has been proposed to potentially appear on California's ballot for the November 3, 2026 general election. You can read more about that here: https://6abc.com/post/california-union-proposes-taxing-billionaires-offset-medicaid-cuts-low-income-people/18066430/

This market will resolve to "Yes" if any proposition containing a one-time tax targeting individuals, households, or family units with wealth, assets, or net worth of at least $1 billion (USD or equivalent) passes in the named election. Otherwise, this market will resolve to "No".

If no qualifying ballot initiative is certified to appear on the official statewide California ballot as a proposition to be voted on in the stated election by June 25, 2026, 11:59 PM ET (the official cutoff date for new initiatives to be approved), or if all qualifying propositions/initiatives are removed from the ballot or amended before the election such that the main threshold drops below $1 billion, this market will resolve "No".

The primary resolution source for this market will be official information from the Government of the State of California, however a consensus of credible reporting may also be used.

Resolution source: 6abc.com

Expected resolution: November 3, 2026