Short Answer

Mamdani will not tax billion-dollar incomes in 2026; the market prices this outcome at 1.1%.

1. Market Behavior & Drivers

No specific news or political development in the provided materials coincides with the price movement in this market. The contract's probability briefly rose from 4.6% on November 1 to 7.0% on November 6 on volume of 353 contracts, before falling to 1.1% by November 15 on just 5 contracts. The lack of a clear external catalyst suggests these early price changes were driven by initial positioning or order book dynamics rather than a reaction to new information.
The contract's current low probability, trading between 1% and 3% as of mid-November, aligns with broader sentiment seen across related prediction markets. Kalshi prices consistently show a 97-98% implied probability for the "No" outcome. This view is corroborated by a separate Polymarket contract on a "2% Millionaire Tax," which also reflects low odds of passage before the December 31, 2026 deadline. The consensus across platforms indicates traders see a very low chance of any new high-earner tax being implemented in this timeframe.
  • Yes: Governor Hochul consistently opposes broad tax increases on high incomes.
  • Yes: The FY2027 state budget passed without Mamdani's proposed income or corporate tax hikes.
  • Yes: Albany authorization faces significant procedural and political hurdles before 2027.

Who Wins and Why

Outcome Market Model Why
Yes 1.1% 0.8% Mamdani consistently advocates for increased taxation on high-income earners to fund public services.

Current Context

Prediction markets assign low probability to new billionaire income tax in 2026. Current trading on Kalshi for "Will Mamdani tax billion-dollar incomes in 2026?" indicates a 2-3% implied probability (Yes at 2-3 cents), with No at 97-98% and volume totaling $100K-$200K as of November 10-12, 2026 [1][2][3][4]. Related markets for a millionaire's tax also reflect low probabilities; Polymarket's "Will Mamdani pass the 2% Millionaire Tax before 2027?" (deadline December 31, 2026) shows Yes at 3% and No at 97% with $70.1K volume as of November 15, 2026, while a similar market for incomes over $1M shows Yes at approximately 6% [5][6]. Mayor Zohran Mamdani stated on November 11, 2026, he is unconcerned that California's Prop 40 billionaire wealth tax defeat would impede momentum in Albany [7][8]. New York Democrats secured supermajorities in both the Assembly and Senate in the 2026 midterms, granting them veto-override power over Governor Kathy Hochul [7][8]. Governor Hochul, re-elected in November 2026, expressed openness to tax increases for programs like universal childcare on November 7, 2026, a shift from her previous "no new taxes" stance [9][10][7]. Both Senate Majority Leader Andrea Stewart-Cousins and Assembly Speaker Carl Heastie favor taxing wealthy New Yorkers [9][10][7]. Public support remains evident; a March 2026 Siena poll found 54% of New York voters and 62% of New York City voters supported allowing New York City to tax residents earning over $1M [11]. An April Emerson poll found 65% of registered city voters favor a millionaires' tax [7][8].
Mamdani's specific tax proposal faces legislative hurdles and reduced fiscal urgency. His primary proposal is a 2% "Fair Share Act" surcharge on New York City residents earning $1M+, estimated to generate approximately $3B annually [12][13]. New York City requires state legislative authorization for this measure, as it lacks independent income-tax authority [12][13]. The measure was not included in the FY2027 state budget, which concluded in May 2026; Albany instead advanced a pied-à-terre tax on high-value second homes [13][14][15]. The city's November 12, 2026, budget update reported a $956M windfall from Wall Street gains, including year-to-date increases of 8% for the Dow and Nasdaq and 10% for the S&P 500 [16]. This influx of funds has eased some of the immediate fiscal pressure that initially drove the tax push [16]. New York City projects a $6.18B budget gap for FY2028, expanding to $8.96B by 2030, and Comptroller Mark Levine has cautioned about an "AI Shockwave" scenario that could erase $3.4B in city tax revenue [16].
A new billion-dollar income tax faces a tight 2026 deadline. The Kalshi/Public.com market for a billion-dollar income tax resolution is January 1, 2027, at 4:59 AM UTC [2][3]. Given the FY2027 state budget was signed without the surcharge in May 2026 and the city's November 2026 budget modification was released on November 12, 2026, any enactment of a new tax before the deadline would necessitate a special Albany legislative session or late legislative action [2][3][13][16]. The law must also take legal effect, not just be enacted, prior to the January 1, 2027, deadline to meet the market's resolution criteria [2][3][13][16]. This short timeframe, combined with the lack of current legislative vehicles, aligns with the low implied probabilities observed in prediction markets.
Sources (16)
  1. 1Will Mamdani tax billion-dollar incomes this year? Odds & Predictions 2027kalshi.com
  2. 2Will Mamdani tax billion-dollar incomes in 2026? Odds & Predictions - Public.compublic.com
  3. 3Will Mamdani tax billion-dollar incomes in 2026?: Kalshi oddspredictionsmarket.com
  4. 4Will Mamdani tax billion-dollar incomes in 2026 odds: 2% chance on Kalshipredictdesks.com
  5. 5Polymarketpolymarket.com
  6. 6Will Mamdani tax incomes over $1M 2026? Odds & Predictionskalshi.com
  7. 7Mamdani Appears Unfazed by California Billionaire Tax Defeatnymag.com
  8. 8Tax the rich proponents not sweating Cali defeat - POLITICOpolitico.com
  9. 9Hochul does not rule out new taxes to help fund programsny1.com
  10. 10Mamdani Budget Floats on Wall Street Cash as Momentum Grows for New Taxes | The City Reporter — NYC Newsthecityreporter.nyc
  11. 11Siena Poll: Hochul Leads Blakeman by 20 Points; Majority of NY Voters Support Millionaire Tax in NYCminorityreporter.net
  12. 12Top NY Dems will back Mamdani's 'tax the rich' push in budget: reportnypost.com
  13. 13https://polymarket.copilot.markets/uk/event/will-mamdani-pass-the-2-millionaire-tax-before-2027polymarket.copilot.markets
  14. 14https://polymarket.copilot.markets/event/will-mamdani-pass-the-2-millionaire-tax-before-2027polymarket.copilot.markets
  15. 15IBO Releases Report on City Executiveibo.nyc.gov
  16. 16NYC poised to get $1 billion in extra tax revenue thanks to tech-fueled gains on Wall Street: Mamdaninypost.com

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

Based on the provided page content, the exact conditions for a YES or NO resolution and any special settlement conditions are not detailed. The market asks "Will Mamdani tax billion-dollar incomes this year?" The market's expiration or maximum payout date is December 31, 2026. Without further rules, it is not possible to specify what actions precisely trigger a YES or NO outcome.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Yes $0.03 $0.99 1%

Market Discussion

Prediction markets currently show very low odds (7% or less) that a law authorizing a new personal income tax bracket or surcharge on incomes over $1 billion for NYC residents will pass by January 1, 2027 [1]. Traders for a related millionaire tax market cite state legislative approval as the main obstacle to Mamdani's proposals, which include a reported 2% income tax on earners of $1B+ [2]. However, Mamdani formally asked the NYS Legislature in February 2026 for a tax hike on wealthy New Yorkers, and as of November 11, 2026, Governor Hochul and legislative leaders appear open to new taxes on wealthy New Yorkers [3].

Sources (3)
  1. 1Will Mamdani tax billion-dollar incomes in 2026?bitcoin.com
  2. 2Will Mamdani Pass the Two Percent Millionaire Tax Before 2027? Odds | Lines.comlines.com
  3. 3Zohran Mamdani asks NYS lawmakers for 2% tax hike on wealthynypost.com

4. Trust Index

Octagon Trust Index Kalshi 76 Good

Order book is critically thin.

Primary risk· Trade quality

How it adds up
Integrity80% of score85Strong
Trade quality20% of score42High Risk

Includes the cost to trade: a $1,000 order can't be filled here because the order book is too thin.

Trust score76Good

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

Trust profile
Integrity4 screens run · 6 don't apply
Market integrity
85Strong

Outcome is hard to influence

No suspicious activity on any screen

Screened clean
Large tradesNo single trade dominates the tape. Clear
Thin-volume movesMoves carried volume Clear
Size patternsNo distribution read Clear
2 screens not run
Outcome control · doesn't apply to this market type
Thin-leg conviction · doesn't apply to this market type
Info fairness
80Good

Structural prior — no screens apply

No suspicious activity on any screen

Screened clean
Information exposureNo concentrated group can know the outcome materially early. Clear
4 screens not run
Move vs. catalyst · doesn't apply to this market type
Longshot repricing · doesn't apply to this market type
Pre-broadcast certainty · doesn't apply to this market type
Cross-venue timing · doesn't apply to this market type
Resolution quality
92Strong

Resolution mechanism is dependable

No suspicious activity on any screen

Resolution rules read: Clear

Liquidity
52Thin

Expect slippage beyond small size

1 contract

Yes52
Thin · low confidence

Light recent trading — size may not fill near the screen price.

Book spread 60% vs realized 3%
Move quality
79Confirmed

Moves came with real volume

1 contract

Yes79
Confirmed · medium confidence

Volume confirms the move over 24h

Rule clarity
100Clear

Counts toward Resolution quality, not here

1 contract

Yes100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
42High Risk

Order book is critically thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 52 (notional-weighted)

$100 order: 3.6c slippage (~200% of a 1.8c contract)

$1,000 order: book too thin to fill

$10,000 order: book too thin to fill

YesPrimary52Market scoreLiquidity52Move quality79Rule clarity100
Why 52
Liquidity
52 · Thin · low confidence

Light recent trading — size may not fill near the screen price.

Book spread 60% vs realized 3%
Move quality
79 · Confirmed · medium confidence

Volume confirms the move over 24h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Nov 15, 2026

5. How might recent polling, like the March 2026 Siena poll, influence the legislative calculus of NY Assembly Speaker Heastie and Senate Majority Leader Stewart-Cousins before year-end?

Statewide support for NYC income tax hike54-29% (Siena poll, March 2026) [1][2][3][4]
NYC voter support for income tax hike62-21% (Siena poll, March 2026) [1][2][3][4]
Democrat support for income tax hike72-13% (Siena poll, March 2026) [1][2][3][4]
A recent poll significantly impacts New York legislative leaders' budget priorities. The March 2026 Siena poll indicated significant statewide support, at 54-29%, for New York City to increase income taxes on residents earning over $1 million [1]. This backing was stronger among NYC voters, at 62-21%, and Democrats, at 72-13% [1]. Following the poll's release, Assembly Speaker Heastie and Senate Majority Leader Stewart-Cousins have signaled their intention to incorporate revenue-generating measures into their budget proposals [1]. This move comes despite Governor Hochul's consistent opposition to new personal income-tax increases [3]. Siena pollster Steven Greenberg highlighted that voters generally prefer taxing millionaires over increasing property taxes on all city property owners, thereby exerting pressure on legislative leaders [2].
Assemblymember Mamdani's tax proposal addresses NYC's budget gap. His plan aims to address an approximately $5.4 billion New York City budget deficit, suggesting a 9.5% citywide property-tax increase only as a "last resort" if state authorization for other revenue raisers is not granted [5]. Subsequent to the poll, state Senate and Assembly leaders confirmed they would integrate revenue raisers consistent with Mamdani's request into their one-house budget plans, while Governor Hochul maintains her stance that current revenues are sufficient [3]. It is important to note a distinction regarding income thresholds: the market's resolution criterion specifies a new personal income tax bracket or surcharge on incomes over $1 billion for New York City residents to take legal effect before January 1, 2027 [6]. However, the Siena poll specifically measured support for raising income taxes on residents earning at least $1 million [1]. The available research does not specify if Mamdani's proposal for a "2-percentage-point increase on top earners" precisely aligns with the market's higher $1 billion threshold [5].
Sources (6)
  1. 1Poll Shows Strong Support for Mamdani’s Tax Hike on High Earners in NYC – La Voce di New Yorklavocedinewyork.com
  2. 2Siena poll: New Yorkers back NYC income tax hike on millionairescbs6albany.com
  3. 3Particle: Hochul Holds Line on Tax Hikes as Albany Readies Proposals After Poll Backs NYC Millionaire Taxparticle.news
  4. 4Siena Poll Shows Mamdani Maintains Favorable Ratings as Hochul Leads Blakeman – The Mamdani Postmamdanipost.com
  5. 5Mamdani Pushes 2-Dollar Childcare Plan as Siena Poll Shows Millionaires Tax Support – The Mamdani Postmamdanipost.com
  6. 6Will Mamdani tax billion-dollar incomes in 2026? - Kalshi Odds | CoinRithmcoinrithm.com

6. What are the primary procedural and political hurdles supporting the market consensus that Albany will not authorize an NYC billionaire tax by the Jan 1, 2027 deadline?

Deadline for NYC billionaire tax authorizationJanuary 1, 2027 [1][2][3]
Yes odds for NYC billionaire tax (August 2026)approximately 11% [4][5][6][3][7]
Yes odds for NYC billionaire tax (mid-November 2026)around 1.8–2% [4][5][6][3][7]
Market consensus expects no NYC billionaire tax by 2027 deadline. The prevailing market view indicates that New York State will not authorize a New York City billionaire tax before the January 1, 2027 deadline. For such a tax to meet this condition, a law establishing a new personal income tax bracket or surcharge on incomes exceeding $1 billion for NYC residents must become fully binding law. This encompasses successful passage by both legislative chambers, executive action, and an effective date, all to be completed prior to January 1, 2027 [1][2][3]. Merely passing the law or having an effective date that extends beyond the deadline would not fulfill this requirement [1][2][3].
Odds for the billionaire tax's passage have significantly decreased. Market expectations for the timely enactment of this tax have rapidly diminished. The "Yes" odds for such a tax being approved fell sharply from approximately 11% in August 2026 to about 1.8–2% by mid-November 2026 [4][5][6][3][7]. This considerable decline reflects the inherent challenges of navigating the legislative process in Albany for this specific type of tax. Furthermore, related markets for other proposed millionaire tax initiatives prior to 2027 also show low probabilities, suggesting a broader perception that the state legislature is unlikely to successfully advance a significant tax agenda within the specified timeframe [8].
Sources (8)
  1. 1Will Mamdani tax billion-dollar incomes in 2026? Odds & Predictions - Public.compublic.com
  2. 2Will Mamdani tax billion-dollar incomes in 2026?: Kalshi oddspredictionsmarket.com
  3. 3Will Mamdani tax billion-dollar incomes in 2026? — live odds on Kalshi · OddsOnAiroddsonair.live
  4. 4Will Mamdani tax billion-dollar incomes in 2… | ElectionOddselectionodds.live
  5. 5Will become law in New York City before Jan 1, 2027?… | Frenzy Capitalfrenzycap.com
  6. 6Will Mamdani tax billion-dollar incomes in 2026? - Kalshi Odds | CoinRithmcoinrithm.com
  7. 7Will Mamdani tax billion-dollar incomes in 2026 odds: 2% chance on Kalshipredictdesks.com
  8. 8Policy odds: tariffs, taxes, immigration and the economyparlaythepeople.com

7. How do Governor Hochul's post-midterm statements on taxes compare with the positions of Mayor Mamdani and legislative leaders Stewart-Cousins and Heastie?

Projected annual revenue from NYC pied-à-terre taxat least $500 million annually [1]
Projected annual revenue from Mamdani's $1 million+ income tax hike~$3 billion annually [2]
NYC pied-à-terre tax passageMay 2026 [3]
Governor Hochul resisted broad tax increases, favoring targeted solutions. She consistently opposed taxing high incomes, citing concerns about potential outmigration of wealth and businesses from New York State [4][1]. Despite this stance, in April 2026, she agreed to a compromise: a state-authorized surcharge on NYC pied-à-terres. This measure was projected to generate at least $500 million annually and was designed to help address Mayor Mamdani's budget deficit without imposing new statewide taxes [1]. The pied-à-terre tax officially passed in May 2026, with Hochul confirming that the budget was achieved "without raising statewide taxes at all," though it did not include Mamdani's broader income tax increase on the wealthy [3].
Mayor Mamdani advocates significant tax increases on wealthy residents. He has taken a more aggressive stance, proposing an income tax hike for those earning $1 million or more [4][2]. His earlier plan, which also included corporate tax increases, was estimated to yield approximately $3 billion annually [4]. While the pied-à-terre tax passed, Mamdani viewed it as a positive step, stating it moved him "one step closer to balancing our budget by taxing the ultra-wealthy and global elites" [3]. In August 2026, when questioned about a potential campaign to revive his broader tax proposals, he hinted that further tax discussions would occur "after November," ahead of the Legislature's return in January 2027 [2].
Legislative leaders occupy a nuanced position between the two executives. They are generally described as occupying a middle ground [4]. Following Hochul's budget announcement in May 2026, Assembly Speaker Carl Heastie notably cautioned, "There is no budget deal," suggesting that key financial aspects remained unresolved and that the budget agreement was still open to further negotiation [3][4]. The available research does not provide specific post-midterm statements from legislative leader Stewart-Cousins regarding billion-dollar income taxes [4].
Sources (4)
  1. 1New NYC pied-à-terre tax proposed by Gov. Hochul as Mamdani faces budget gap | AP Newsapnews.com
  2. 2Mamdani repeatedly sidesteps questions on reported plan to revive tax hikes on wealthy New Yorkers - NEW YORK TIMES POSTnytimespost.com
  3. 3New York expected to impose pied-à-terre tax but no income tax hike on the rich | AP Newsapnews.com
  4. 4Will Mamdani tax billion-dollar incomes in 2026? — live odds on Kalshi · OddsOnAiroddsonair.live

8. What is the most viable legislative pathway for a 'Yes' resolution, considering the Democratic supermajorities in the NY Assembly and Senate?

Probability of 'Yes' ResolutionLow probability before January 1, 2027 [1][2]
Market Price for 'Yes' Resolution1.8–3¢ on Kalshi, 2.1¢ on Public.com, 1% on OpinionKings (as of Nov 10–14, 2026) [3][4][5][6]
Probability Decline (Aug-Nov 2026)From 11% (early August 2026) to 2% (mid-November 2026) [1][2]
A 'Yes' resolution faces low odds by January 2027. The likelihood of a 'Yes' resolution passing before January 1, 2027, is considered low [1][2]. For this resolution to become a fully enacted state law governing New York City, it would require a new personal income tax bracket or surcharge on incomes over $1 billion for New York City residents [3][4][5]. This process would necessitate a gubernatorial signature, potential veto override, or gubernatorial inaction, along with an effective date preceding January 1, 2027 [3][4][5]. Despite Democratic supermajorities in both the New York Assembly and Senate, final passage in both chambers and executive action are essential for the resolution to become law [3][4].
Market assessments indicate the legislative pathway is effectively closed. According to market assessments, the state-legislative pathway for the resolution is effectively closed for the 2026 window [1][2]. In mid-November 2026, market prices for a 'Yes' resolution were notably low, with figures around 1.8–3¢ on Kalshi, 2.1¢ on Public.com, and 1% on OpinionKings [3][4][5][6]. The probability for such a resolution significantly dropped from approximately 11% in early August 2026 to around 2% by mid-November 2026, which reinforces the market's view of a stalled legislative agenda [1][2][7].
Sources (7)
  1. 1Will Mamdani tax billion-dollar incomes in 2… | ElectionOddselectionodds.live
  2. 2Will become law in New York City before Jan 1, 2027?… | Frenzy Capitalfrenzycap.com
  3. 3Will Mamdani tax billion-dollar incomes in 2026?: Kalshi oddspredictionsmarket.com
  4. 4Will Mamdani tax billion-dollar incomes in 2026? Odds & Predictions - Public.compublic.com
  5. 5Will Mamdani tax billion-dollar incomes in 2026? - Kalshi Odds | CoinRithmcoinrithm.com
  6. 6Will Mamdani tax billion-dollar incomes in 2026? · OpinionKingsopinionkings.com
  7. 7Policy odds: tariffs, taxes, immigration and the economyparlaythepeople.com

9. How do the resolution criteria and implied probabilities of this Kalshi market compare to other active markets on NYC wealth taxes, like Polymarket's '2% Millionaire Tax'?

Kalshi billion-dollar tax probability2–3% (Nov 10–12, 2026) [1][2][3][4][5]
Polymarket millionaire tax probability3–4% Yes [6]
Kalshi $1M+ tax probability6–11% Yes [7][8][9]
NYC wealth tax markets show low probabilities across platforms. Kalshi's market "Will Mamdani tax billion-dollar incomes in 2026?" [1][2][3] concerns a new personal income tax bracket or surcharge on incomes exceeding $1 billion for NYC residents, becoming law before January 1, 2027 [1][2][3]. Its implied probabilities decreased from approximately 11% in August 2026 to 2–3% by November 10–12, 2026 [5][2][3][4][1]. In contrast, Polymarket's "Will Mamdani pass the 2% Millionaire Tax before 2027?" [6][10] focuses on a specific 2% flat tax proposal targeting NYC residents earning over $1 million [6][10] and currently trades around 3–4% Yes [6][10].
Resolution criteria significantly differentiate market scopes and outcomes. The Kalshi billion-dollar market requires the new law to be fully effective, including signatures or veto overrides, before the deadline; laws enacted prior to the deadline but effective afterward do not qualify [1][2][3]. The market's $1 billion income threshold is considerably narrower than Polymarket's $1 million+ scope [1][6][10]. Kalshi also offers a related market, "Will Mamdani tax incomes over $1M before 2027?" [7][8][9], which shares the same enactment-based resolution rules but has a $1 million threshold, making it the closest comparison to Polymarket's offering [7][8][9][10]. This market has seen approximately $53–59K in trading volume and has recently been priced around 6–11% Yes [7][8][9].
Structural barriers keep wealth tax probabilities in low single digits. Implied probabilities for tax increases on high earners consistently remain in the low single digits across both platforms, reflecting significant structural hurdles [1][6]. These challenges include the necessity of approval from the Albany state legislature and Governor Hochul, potential legal issues related to similar surcharges, the risk of high-earner out-migration, and opposition from businesses [6]. The generally lower probabilities for Kalshi's billion-dollar market (2–3%) compared to Polymarket's millionaire tax market (3–4%) are consistent with its more stringent $1 billion income threshold [1][6][10].
Sources (10)
  1. 1Will Mamdani tax billion-dollar incomes in 2026? Odds & Predictions - Public.compublic.com
  2. 2Will Mamdani tax billion-dollar incomes in 2026? — live odds on Kalshi · OddsOnAiroddsonair.live
  3. 3Will Mamdani tax billion-dollar incomes in 2026?: Kalshi oddspredictionsmarket.com
  4. 4Will Mamdani tax billion-dollar incomes in 2… | ElectionOddselectionodds.live
  5. 5Will Mamdani tax billion-dollar incomes in 2026 odds: 2% chance on Kalshipredictdesks.com
  6. 6Polymarketpolymarket.com
  7. 7Will Mamdani tax incomes over $1M before 2027? - Cotes Kalshi | CoinRithmcoinrithm.com
  8. 8Will Mamdani tax incomes over $1M before 2027? - Kalshi Quoten | CoinRithmcoinrithm.com
  9. 9Politics · Kalshikalshii.net
  10. 10Policy odds: tariffs, taxes, immigration and the economyparlaythepeople.com

10. What Could Change the Odds

Key Catalysts

Mamdani's core proposal includes a 2% city income surcharge on residents earning $1M+ and a 2% hike targeting incomes over $1 billion, part of a $23B tax package requiring Albany's authorization [1]. Although the FY2027 state budget, passed May 27-28, 2026, did not include Mamdani's income or corporate tax hikes [2], the post-Nov 2026 midterm elections show Democrats holding a supermajority in both Albany chambers [3]. Senate Majority Leader Andrea Stewart-Cousins signaled a 'progressive taxation' push [3]. Mamdani stated on Nov 11, 2026, that California's Prop 40 defeat would not slow momentum for tax increases [4].
The state's current FY revenue is $8B above projection, with the state deficit falling from ~$6B to $3B, potentially reducing the urgency for new taxes [5]. NYC personal income taxes ran $500M above expectations in Q1 FY27, and Mamdani's Nov 12, 2026 Financial Plan reported $965M in additional FY27 tax revenue [5][6]. Despite this, Governor Hochul, reelected in Nov 2026, opened the door to a tax increase last Friday (Nov 2026), a shift from her previous stance against income tax hikes [5][7]. Both Assembly Speaker Carl Heastie and Senate Majority Leader Stewart-Cousins now favor an increase on wealthy New Yorkers [5]. For a billion-dollar income tax to become binding law and take legal effect before Jan 1, 2027 [8][9], there is currently no active legislative vehicle, necessitating a gubernatorial reversal, special session, or last-minute budget reconciliation [10][11].

Key Dates & Catalysts

  • Expiration: January 08, 2027
  • Closes: January 01, 2027
Sources (11)
  1. 1Mamdani pushed combined $23B worth of new NYC taxes in just his first 100 daysnypost.com
  2. 2Mamdani Gets a New York City Bailout, but Not the One He Wantednysfocus.com
  3. 3Mamdani Appears Unfazed by California Billionaire Tax Defeatnymag.com
  4. 4Tax the rich proponents not sweating Cali defeat - POLITICOpolitico.com
  5. 5Mamdani Budget Floats on Wall Street Cash as Momentum Grows for New Taxes | The City Reporter — NYC Newsthecityreporter.nyc
  6. 6Mayor Mamdani Releases November Financial Plan, Reduces Budget Gap While Protecting Essential Services - NYC Mayor's Officenyc.gov
  7. 7Mamdani Again Asks to Raise Taxes on Rich, Hochul: ‘It’s not happening’ | The Epoch Timestheepochtimes.com
  8. 8Will Mamdani tax billion-dollar incomes in 2026? Odds & Predictions - Public.compublic.com
  9. 9Will Mamdani tax billion-dollar incomes in 2026?: Kalshi oddspredictionsmarket.com
  10. 10Polymarketpolymarket.com
  11. 11https://polymarket.copilot.markets/event/will-mamdani-pass-the-2-millionaire-tax-before-2027polymarket.copilot.markets