California Proposition 40 election margin of victory? (No)
Short Answer
1. Market Behavior & Drivers
- The "No" outcome on Proposition 40 achieved a 6.4% margin, exceeding the 4% threshold.
- This 6.4% margin falls short of the 7% threshold, reducing higher likelihoods.
Who Wins and Why
| Outcome | Market | Model | Why |
|---|---|---|---|
| No, ≥4% | 97.0% | 100.0% | The reported 6.4% margin for "No" clearly exceeds this threshold. |
| No, ≥7% | 14.0% | 1.8% | The reported 6.4% margin for "No" falls short of this threshold. |
| No, ≥10% | 2.0% | 0.0% | The reported 6.4% margin for "No" is significantly below this threshold. |
| No, ≥22% | 1.0% | 0.0% | The reported 6.4% margin for "No" is well below this threshold. |
| No, ≥1% | 97.0% | 100.0% | The reported 6.4% margin for "No" clearly exceeds this threshold. |
Current Context
Sources (14)
- 1California Proposition 40 Election Results 2026: Billionaire...nytimes.com
- 22026 CA Proposition 40 - One-Time Wealth Tax for State-Funded Healthcare, Education, and Food… Results | DDHQvotes.decisiondeskhq.com
- 3Here's how every California county voted on Proposition 40sfgate.com
- 4California Proposition resultselections.scoopylabs.com
- 5Propositions-2026 — Tri-Valley Republicanstrivalleyrepublicans.org
- 62026 California Proposition 40 - Wikipediaen.wikipedia.org
- 72026 midterm election results map for Prop. 40, the billionaire tax - Los Angeles Timeslatimes.com
- 8Can Prop 40 still pass? Here’s the mathsfchronicle.com
- 9A Primer: The Labor and Public-Interest Coalition Against Prop 40 | Garry's Listgarryslist.org
- 10California's Wealth Tax Gamble: Jonathan Williams on American Radio Journal - American Legislative Exchange Council - American Legislative Exchange Councilalec.org
- 11Billionaire one-time wealth tax passes in California election...polymarket.com
- 12Prediction markets set odds on California ballot measuresnypost.com
- 13California ballot campaigns have spent $213 million. The biggest fight is over billionaires | Tribune | dailygazette.comdailygazette.com
- 14California Dems go full socialist, backing billionaire taxnypost.com
2. Price Chart
Historical Price (Probability)
3. Significant Price Movements
Notable price changes detected in the chart, along with research into what caused each movement.
Outcome: No, ≥4%
📈 November 09, 2026: 23.0pp spike
Price increased from 74.0% to 97.0%
📉 November 07, 2026: 14.0pp drop
Price decreased from 87.0% to 73.0%
Outcome: No, ≥7%
📉 November 06, 2026: 26.0pp drop
Price decreased from 48.0% to 22.0%
📉 November 05, 2026: 57.0pp drop
Price decreased from 96.0% to 39.0%
📈 November 04, 2026: 40.0pp spike
Price increased from 56.0% to 96.0%
Sources (6)
- 1California Proposition 40 Election Results 2026: Billionaire...nytimes.com
- 22026 CA Proposition 40 - One-Time Wealth Tax for State-Funded Healthcare, Education, and Food… Results | DDHQvotes.decisiondeskhq.com
- 32026 CA Election Results - California Proposition 40courier-journal.com
- 4Billionaire tax fails, bond measures pass in California | California | thecentersquare.comthecentersquare.com
- 52026 midterm election results map for Prop. 40, the billionaire tax - Los Angeles Timeslatimes.com
- 6Ballot Signals, Report 2: Prop 40 Won the Feed but Lost Ground in the Pollsapp.rolli.ai
4. Market Data
Contract Snapshot
This contract, "California Proposition 40 election margin of victory? (No) - No, ≥1%", resolves to YES if the "No" vote for California Proposition 40 wins by a margin of 1% or greater. Conversely, it resolves to NO if the "No" vote wins by a margin less than 1%, which includes scenarios where the "Yes" vote wins. The market is scheduled for settlement by November 3, 2027.
Available Contracts
Market options and current pricing
| Outcome bucket | Yes (price) | No (price) | Last trade probability |
|---|---|---|---|
| No, ≥1% | $1.00 | $0.03 | 97% |
| No, ≥4% | $0.84 | $0.22 | 97% |
| No, ≥7% | $0.19 | $0.88 | 14% |
| No, ≥10% | $0.03 | $0.98 | 2% |
| No, ≥19% | $0.02 | $1.00 | 2% |
| No, ≥13% | $0.02 | $1.00 | 1% |
| No, ≥16% | $0.01 | $1.00 | 1% |
| No, ≥22% | $0.01 | $1.00 | 1% |
Market Discussion
California Proposition 40, a one-time 5% billionaire wealth tax, was defeated on November 3, 2026, with 'No' winning by approximately 6.4 percentage points (53.2% to 46.8%) [1]. Prediction markets had correctly priced the measure's passage at 25-27% in late October 2026, contrasting with polls showing 'Yes' ahead, by factoring in significant 'No' campaign spending by billionaires (over $300 million combined with related propositions) [2] and the potential for Propositions 41 and 42 to override Prop 40 [3]. Opponents like Mark Cuban argued the tax would drive startup founders out of California, while proponents like Rep. Ro Khanna defended it as necessary to preserve healthcare services [4].
Sources (4)
- 1California Proposition 40 Election Results 2026: Billionaire...nytimes.com
- 2California Wealth Tax: Prop 40 Polls Lead, Markets Doubtdefirate.com
- 3Mediummedium.com
- 4Mark Cuban and Rep. Ro Khanna got into it on X this past weekend over California's Proposition 40 — the proposed 5% wealth tax on the state's ~250 billionaires headed to voters … | Nathan C. Goldmanlinkedin.com
5. Trust Index
Includes the cost to trade: a $10,000 order can't be filled here because the order book is too thin.
Weighted blend with hard caps — a critically weak safety pillar, or a severe trading anomaly, caps the total regardless of the rest. Full methodology · About the Trust Index
6. How did the fundraising and spending strategies of the 'Yes on 40' and 'No on 40' campaigns compare throughout 2026?
| No on 40 Direct Contributions | $140.5 million [1] |
|---|---|
| Yes on 40 Direct Contributions | $33.2 million [1] |
| Overall Opponent Fundraising | Approximately $389 million (versus $33 million for 'Yes' side) [2] |
Sources (5)
- 1California Proposition 40, One-Time Wealth Tax for State-...ballotpedia.org
- 2The billionaire tax looks likely to fail. Here's how much was...sfchronicle.com
- 3November 2026 General Electionfppc.ca.gov
- 4The ultra-rich are spending one million dollars a day...theguardian.com
- 5Meet the billionaires spending millions to defeat...lapublicpress.org
7. What were the key media campaigns or late-breaking endorsements that influenced voter sentiment on Proposition 40 in October and November 2026?
| Opposition spending | More than $42.8M (first two weeks of October 2026) [1] |
|---|---|
| Major media against Prop 40 | LA Times, San Francisco Chronicle, Orange County Register, San Diego Union-Tribune [2] |
| Voters who saw ads | 84% (Politico poll, late October 2026) [1] |
Sources (5)
- 1Billionaire tax: how a union leader's 'crazy' idea became...theguardian.com
- 2Proposition 40: Billionaire tax - 2026 Voter Guidecalmatters.org
- 3Newsom backs ban on wealth taxes in California electioncalmatters.org
- 4California billionaire tax explained: What to know about...cnbc.com
- 5November 2026 General Electionfppc.ca.gov
8. How did economic impact analyses from the Legislative Analyst's Office and the Hoover Institution shape the opposition campaign against Proposition 40?
| LAO Near-term revenue | Tens of billions of dollars [1][2][3] |
|---|---|
| Hoover Inst. Long-term loss | Approximately $39 billion [1][3][4][5] |
| Prop 40 voter rejection | 54% No, 46% Yes [6][7] |
Sources (9)
- 12026 California Proposition 40en.wikipedia.org
- 2Billionaire Tax Explained: What Proposition 40 Would...calbudgetcenter.org
- 3California's billionaire tax could leave the state $39 billion...fortune.com
- 4California's Budget Has Ballooned—Taxes Should Nothoover.org
- 5Hoover Institution's postfacebook.com
- 6California Proposition 40 Election Results 2026: Billionaire...nytimes.com
- 7California rejects billionaire wealth taxnewsnationnow.com
- 8Should States Tax Their Richest Residents More...closeup.org
- 9California Prop. 40: One-Time Billionaire Tax Could Set...taxnotes.com
9. What were the key deadlines for certifying the final vote count for California's Proposition 40 after the November 3, 2026 election?
| Counties certify results | December 3, 2026 [1][2][3][4] |
|---|---|
| Secretary of State certifies Statement of Vote | December 11, 2026 [1][2][3][5][4][6] |
| Proposition 40 takes effect | December 16, 2026 [2][3] |
Sources (6)
- 1Close Count project update on California vote count and...calvoter.org
- 2California Propositions 2026: Nov 3 Ballot Guidegovbuddy.com
- 32026 California election results master guide: All 14...californiatoday.com
- 4November 3, 2026, General Election Calendarelections.cdn.sos.ca.gov
- 52026 General Election Official Voter Information Guidevig.cdn.sos.ca.gov
- 6California's 5% Billionaire Tax Faces Defeat as Voters...lawcommentary.com
10. What were the primary arguments used by the coalition of organizations, including the California Medical Association and California YIMBY, in their formal opposition to Proposition 40?
| Estimated Lost Revenue | $25 billion for schools, healthcare, and public safety (official 'No on Prop 40' voter guide) [1] |
|---|---|
| Ongoing Income-Tax Revenue Decrease | Hundreds of millions of dollars annually (Legislative Analyst's Office) [2][3] |
| Affected Residents Potentially Relocating | Approximately 200 wealthy residents (Legislative Analyst's Office) [2][3] |
Sources (6)
- 1Proposition 40vig.cdn.sos.ca.gov
- 2The Labor and Public-Interest Coalition Against Prop 40garryslist.org
- 3Office of Legislative Affairs - "The Friday Wrap-Up"content.govdelivery.com
- 4California Proposition 40, One-Time Wealth Tax for State-...ballotpedia.org
- 52026 California Proposition 40en.wikipedia.org
- 6Why California YIMBY Opposes the Billionaire Wealth Taxcayimby.org
11. What Could Change the Odds
Key Catalysts
Key Dates & Catalysts
- Expiration: November 03, 2027
- Closes: November 03, 2027
Sources (13)
- 1California Proposition 40 Election Results 2026: Billionaire...nytimes.com
- 2Here's how every California county voted on Proposition 40sfgate.com
- 32026 CA Proposition 40 - One-Time Wealth Tax for State-Funded Healthcare, Education, and Food… Results | DDHQvotes.decisiondeskhq.com
- 42026 CA Election Results - California Proposition 40courier-journal.com
- 5California Proposition resultselections.scoopylabs.com
- 6Propositions-2026 — Tri-Valley Republicanstrivalleyrepublicans.org
- 7Polymarket's California wealth tax contract asks whether Proposition 40 passes, and passing may not be enoughipredicta.co
- 8Will the California Billionaire Wealth Tax Pass?deadspin.com
- 9Californians split on proposed billionaire tax, sour on voter ID requirement, poll showsnypost.com
- 10New UC Berkeley IGS Poll Finds California Prop. 40, the ‘Billionaire Tax,’ Holds Lead and 80% of Democrats Would Vote No on Proposition 39, the Voter ID Initiativegoldrushcam.com
- 11November Ballot Update 2026cedmc.org
- 12Commentary: Affordability Is the Top Issue on California’s November Ballot - Public Policy Institute of Californiappic.org
- 13Press Releases Archives - Vote No on Prop 40votenoon40.org