Short Answer

Both the model and the market expect Mamdani to raise corporate taxes before 2027, with no compelling evidence of mispricing.

1. Market Behavior & Drivers

The prediction market for whether Mamdani will raise corporate taxes before 2027 has shown a distinct downward trend. Opening at a 20.0% probability, the market remained stable for a period before experiencing a significant drop to 13.0% around May 8, 2026. This price, which is the market's current level, also represents its all-time low. The overall price range has been between 13.0% and 24.0%. The initial 20% price appears to have factored in the administration's February 1, 2026 preliminary budget proposal, which seeks corporate tax increases. The subsequent drop to 13% suggests that market participants grew more skeptical about the proposal's chances of being enacted before the deadline, or may believe that other revenue sources, like the proposed personal income tax increases on millionaires, are more likely to be pursued.
The price action is supported by volume patterns that indicate strong market conviction. The sharp drop from 20.0% to 13.0% was accompanied by a notable volume spike, suggesting that the move was driven by a significant influx of trading activity rather than a small number of trades. This reinforces the idea of a decisive shift in sentiment. From a technical perspective, the 13.0% mark has established itself as a key support level, being the lowest price traded. The prior stable price of 20.0% now acts as a resistance level. Overall, the chart indicates a sustained bearish sentiment, with traders pricing in a low and decreasing probability that a corporate tax increase will be signed into law before January 1, 2027, despite the administration's publicly stated goals.
  • The 2026 legislative session presents a narrow window for passing the tax plan.
  • Historical precedent shows limited success for city-specific corporate tax increases.
  • Mayor Mamdani proposes new taxes; Governor Hochul consistently opposes increases.
  • Varied NYC fiscal deficit projections may pressure state lawmakers.
  • Governor Hochul consistently opposed corporate tax increases during Q2-Q3 2026 negotiations.

Who Wins and Why

Outcome Market Model Why
Yes 13.0% 10.2% No specific information is provided in the research excerpt to support a corporate tax raise before 2027.

Current Context

Mamdani's office seeks corporate tax increases to balance the FY2027 budget. The prediction market "Will Mamdani raise corporate taxes before 2027?" resolves to "Yes" only if a law increasing the NYC Business or New York State corporate tax rate is enacted in NYC before January 1, 2027 [1][2]. Mamdani's administration expressed a preference for generating recurring revenue through higher personal income taxes on millionaires and increased taxes on the most profitable corporations, aiming to avoid reliance on property taxes and city reserves to balance the budget, as framed in the February 1, 2026 FY2027 preliminary budget [3]. The specific corporate tax proposal, reported on March 6, 2026, includes raising city corporate taxes by +1.8 percentage points for the finance sector, +1.77 points for other corporations, and +0.4 points for large unincorporated businesses. Additionally, it proposes limiting the Pass-Through Entity Tax credit benefit to 75 cents on the dollar. This package is estimated to generate approximately $700 million annually from the credit change and a total of about $1.75 billion annually [4].
Enactment of Mamdani's tax proposals faces significant opposition and delays. As of May 8, 2026, Mamdani’s proposals remained under negotiation rather than being enacted [1][2][4][5]. Governor Hochul's office stated opposition to corporate tax increases during FY budget negotiations on March 30, 2026 [5]. At that time, state budget discussions, which were due by April 1, were not close to reaching an agreement, making the enactment of corporate tax hikes before January 1, 2027 less likely [5].
Sources (5)
  1. 1Will Mamdani raise corporate taxes before 2027? | Politics Prediction Markets | Solflaresolflare.com
  2. 2Will Mamdani raise corporate taxes before 2027? Odds & Market Details | Bitcoin.com Marketsmarkets.bitcoin.com
  3. 3Mayor Mamdani Releases Balanced Fiscal Year 2027 Preliminary Budget - NYC Mayor's Officenyc.gov
  4. 4Mamdani’s New Albany Asks: Smaller Corporate Tax Hike, Fees on Pricey…nysfocus.com
  5. 5NY Dems pushing to raise corporate tax rate to bail out Mamdani’s massive deficit: ‘There’s a huge appetite’finance.yahoo.com

2. Price Chart

Historical Price (Probability)

Outcome probability
Date

3. Market Data

Contract Snapshot

The market resolves to "Yes" if a law raising the NYC Business or New York State corporate tax rate applicable to New York City becomes binding law before January 1, 2027; otherwise, it resolves to "No." The law's enactment requires the completion of all constitutional and legal requirements, including executive approval where applicable, and merely extending an existing temporary rate does not constitute a rate increase. The market closes by December 31, 2026, at 11:59 pm EST, or earlier if the law is enacted.

Available Contracts

Market options and current pricing

Outcome bucket Yes (price) No (price) Last trade probability
Yes $0.13 $0.88 13%

Market Discussion

Traders are primarily discussing the interpretation of the market rules, specifically if a law passed at the city or state level would satisfy the condition of "Mamdani raising corporate taxes." Arguments for a "Yes" outcome often focus on the perceived societal benefits of higher corporate taxes for small businesses and local economies, referencing historical periods with high marginal tax rates as precedent. Conversely, a "No" argument centers on the literal wording, questioning if Mamdani personally has the direct power to enact such a change, despite clarifications that city or state laws applying to NYC would resolve the market to "Yes."

4. Trust Index

Octagon Trust Index Kalshi 77 Good

“Before 2028” made a large jump with almost no trading behind it.

Integrity risk· Thin-volume moves

How it adds up
Integrity80% of score83Good
Trade quality20% of score54Caution

Includes the cost to trade: a $10,000 order can't be filled here because the order book is too thin.

Trust score77Good

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
79Good

Outcome is hard to influence

Thin-volume movesTrade signals · high confidence

“Before 2028” made a large jump with almost no trading behind it.

Screened clean
Large tradesNo single trade dominates the tape. 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
69Tradeable

Fills fine at modest size

4 contracts · worst first

Before 202932
Very thin · low confidence

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

Before 202837
Very thin · low confidence

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

Before 203055
Thin · low confidence

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

Book spread 108% vs realized 3%
Before 202771
Tradeable · low confidence

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

Book spread 56% vs realized 2%
Move quality
66Mostly confirmed

Most moves carried real volume

4 contracts · worst first

Before 202766
Mostly confirmed · medium confidence

Volume opposes the move over 24h

Before 202972
Confirmed · medium confidence

Volume confirms the move over 24h

Before 2030—
No significant move (3d)

Price was stable over the last 3 days.

Before 2028—
No trading in 5d

No trades in the last 5d — nothing to confirm

Rule clarity
100Clear

Counts toward Resolution quality, not here

4 contracts · worst first

Before 2030100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before 2029100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before 2028100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before 2027100
Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Trade quality
54Caution

Order book is thin

Tradable, but expect execution cost beyond small sizes.

Outcome quality 69 (notional-weighted across 4 scored legs)

$100 order: 3.4c slippage (~52% of a 6.5c contract)

$1,000 order: 8.5c slippage (~131% of a 6.5c contract)

$10,000 order: book too thin to fill

Before 203055Market scoreLiquidity55Move quality–Rule clarity100
Why 55
Liquidity
55 · Thin · low confidence

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

Book spread 108% vs realized 3%
Move quality
No significant move (3d)

Price was stable over the last 3 days.

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before 202932Market scoreLiquidity32Move quality72Rule clarity100
Why 32
Liquidity
32 · Very thin · low confidence

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

Move quality
72 · 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
Before 202837Market scoreLiquidity37Move quality–Rule clarity100
Why 37
Liquidity
37 · Very thin · low confidence

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

Move quality
No trading in 5d

No trades in the last 5d — nothing to confirm

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear
Before 202771Market scoreLiquidity71Move quality66Rule clarity100
Why 71
Liquidity
71 · Tradeable · low confidence

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

Book spread 56% vs realized 2%
Move quality
66 · Mostly confirmed · medium confidence

Volume opposes the move over 24h

Rule clarity
100 · Clear · high confidence

All checks pass

objective outcome · Clearofficial source · Cleartime boundary · Clear

underwriting_v1.4 · computed Sep 24, 2026

5. What are the critical dates and procedural hurdles in the 2026 New York State legislative session for passing Mamdani's corporate tax plan?

Legislative Session ConvenesJanuary 7, 2026 [1][2][3]
Legislative Session AdjournsJune 10, 2026 [1][2][3]
New York Fiscal Year StartApril 1, 2026 [4]
The 2026 New York State legislative session presents a narrow window. The critical period for passing Mamdani’s corporate tax plan is from January 7, 2026, when the New York State Legislature convenes, until its scheduled adjournment on June 10, 2026 [1][2][3]. While the New York fiscal year commences on April 1, 2026, lawmakers have historically missed this budget deadline, sometimes extending funding negotiations, for example, until April 7 [4][5][6]. This history suggests that any new tax provisions would need to be negotiated and finalized within an already compressed budget timeline [4][5][6].
Approval from Albany lawmakers and the governor is a major hurdle. Mamdani’s corporate tax proposals, including increases to state corporate taxes, fundamentally depend on securing approval from lawmakers in Albany [7][4][8]. A significant procedural hurdle in this process is obtaining this legislative consensus, with the governor's stance identified as a critical factor in budget negotiations [7][4][8]. For instance, a 2026 legislative initiative aligned with Mamdani's objectives, which sought to authorize New York City to impose a 25% 'tax liability surcharge' on corporations, would similarly necessitate both legislative passage and gubernatorial action for its enactment [9][10].
Sources (10)
  1. 12026 New York legislative session - Ballotpediaballotpedia.org
  2. 2Legislative Session Calendar | New York State Assemblywww2.nyassembly.gov
  3. 3[PDF] New York State Legislative Session Calendar - NYS Senatenysenate.gov
  4. 4NY Dems pushing to raise corporate tax rate to bail out Mamdani’s massive deficit: ‘There’s a huge appetite’finance.yahoo.com
  5. 5New York misses state budget deadline; talks expected to stretch for weekscbs6albany.com
  6. 6New York Budget Deadline Missed as Lawmakers Extend Funding Through April 7 | Local | wktv.comwktv.com
  7. 7Mamdani wants to change the tax code. Here’s what that could look like. - Gothamistgothamist.com
  8. 8What are Mamdani’s plans to tax the rich? - City & State New Yorkcityandstateny.com
  9. 9Zohran Mamdani’s Albany pals push bill to slap 25% ‘surcharge’ on NYC corporationsyahoo.com
  10. 10Mamdani's Albany pals push bill to slap 25% 'surcharge' on NYC corporationsnypost.com

6. What is the historical precedent for a New York City mayor successfully lobbying Albany for a city-specific corporate tax increase during state budget negotiations?

Successful Corporate Tax Hike PrecedentNot readily apparent for a NYC mayor during state budget negotiations [1]
NYC Fiscal Contribution to StateDisproportionate share of state revenue while receiving less in return [2][3][4]
NYC Independent Taxing PowerLimited, with instances of being 'rebuffed' by the state [1]
Historical precedent shows limited success for city-specific corporate tax increases. There is no clear historical record of a New York City mayor successfully lobbying Albany for a city-specific corporate tax increase during state budget negotiations [1]. New York City's independent taxing power is often restricted, requiring mayors to appeal to the state legislature for any changes to local taxes, a process that has sometimes resulted in the city being 'rebuffed' by the state [1]. Historically, the fiscal relationship between New York City and Albany has been characterized by the city contributing a disproportionate amount of state revenue while receiving less in return [2][3][4]. This imbalance has frequently prompted mayors to advocate for tax increases, including on corporations, as a means to address the city's budget deficits [2][5][6].
Current Mayor Mamdani proposes city-specific corporate tax hikes. New York City Mayor Zohran Mamdani is currently proposing city-specific corporate tax increases for the upcoming 2026 state budget discussions [7][6]. His administration believes that a focused approach might prove more politically viable, even while acknowledging that securing such an increase will be a challenging endeavor [7][6].
Sources (7)
  1. 1gothamgazette.com
  2. 2nysfocus.com
  3. 3cuny.eduislg.cuny.edu
  4. 4nyc.gov
  5. 5groundworkcollaborative.org
  6. 6cityandstateny.com
  7. 7nysfocus.com

7. How do Mayor Mamdani's and Governor Hochul's proposed solutions for closing New York City's FY2027 budget gap differ?

Mamdani's Income Tax TargetIndividuals earning over $1 million [1]
Mamdani's Proposed Property Tax Increase9.5% [1]
Hochul's State Allocation to NYC$1.5 billion over two years [2]
Mayor Mamdani proposes new taxes and property rate hikes for budget stability. Mayor Mamdani’s preliminary budget for Fiscal Year 2027 primarily seeks to close New York City’s budget gap by focusing on generating new recurring revenue. His plan includes implementing higher personal income taxes for individuals earning over $1 million and increasing taxes on the most profitable corporations [1]. Additionally, the budget assumes a 9.5% property tax rate increase, with provisions to draw from reserves if the necessary new revenue authority is not secured [1].
Conversely, Governor Hochul opposes new income taxes, offering state aid instead. Governor Hochul’s executive-budget materials for FY2027 explicitly state her opposition to "no income tax increases on New Yorkers" [3]. Her strategy emphasizes state support for New York City, exemplified by a state allocation of $1.5 billion over two years to help address its budget shortfall [2]. Governor Hochul has also demonstrated unwillingness to approve city-proposed tax adjustments, specifically rejecting a pass-through entity tax (PTET) change, which was estimated to generate approximately $1 billion in revenue for New York City [4]. This stance suggests she would likely resist similar corporate-tax modifications that require state action [3][4].
Sources (4)
  1. 1Mayor Mamdani Releases Balanced Fiscal Year 2027 Preliminary Budget - NYC Mayor's Officenyc.gov
  2. 2Hochul earmarks $1.5B to help Mamdani close New York City's budget gaptimesunion.com
  3. 3GOVERNOR KATHY HOCHULgovernor.ny.gov
  4. 4Hochul Refuses NYC Tax Move in Budget Showdown | THE CITY — NYC Newsthecity.nyc

8. What level of projected fiscal deficit for NYC in FY2027 would likely create sufficient pressure for state lawmakers to approve a tax hike before year-end 2026?

Restated FY2027 Fiscal Gap$10.405B (NYC Comptroller Levine) [1][2]
Re-estimated FY2027 Fiscal Gap$2.853B (2.3% of total revenues, NYC Comptroller Levine) [2]
Revenue from Proposed FY2027 Property Tax Increase$3.7B (Mayor Mamdani's preliminary budget) [3]
New York City faces varied fiscal deficit projections for FY2027. NYC Comptroller Levine reported a restated gap of $10.405 billion and a re-estimated gap of $2.853 billion, which represents 2.3% of total revenues [1][2]. The Comptroller also noted that without the proposed property tax increase, the FY2027 gaps would increase to $6.53 billion [2].
Mayor Mamdani's preliminary budget relies on state-approved revenue. The Mayor's February 2026 preliminary budget for FY2027 assumed a 9.5% property tax rate increase, projected to generate $3.7 billion, and utilized reserve funds [3]. However, this budget explicitly indicated that any remaining gaps would necessitate new recurring revenue authority. State Comptroller DiNapoli, in March 2026, characterized the preliminary budget as revealing an emerging structural gap, observing that the city's plan would depend on a politically sought, state-approved revenue strategy, even with expected reserve drawdowns [4].
No specific deficit level guarantees state tax hike approval. Both state legislative and gubernatorial approval are considered essential for a tax hike to proceed, according to the prediction market [5][6][3][4]. While the city's budget strategy, outlined by Mayor Mamdani and Comptroller DiNapoli, highlights a reliance on state-approved revenue to address these structural deficits, the available information does not specify a particular FY2027 fiscal deficit level that would likely compel state lawmakers to approve such a tax increase before the end of 2026 [4][3].
Sources (6)
  1. 1FY 2027 Budget Preview - Office of the New York City Comptroller Mark Levinecomptroller.nyc.gov
  2. 2Comments on New York City’s Preliminary Budget - Office of the New York City Comptroller Mark Levinecomptroller.nyc.gov
  3. 3Mayor Mamdani Releases Balanced Fiscal Year 2027 Preliminary Budget - NYC Mayor's Officenyc.gov
  4. 4DiNapoli: NYC Budget Increases Transparency, Reveals Structural Gaps | Office of the New York State Comptrollerosc.ny.gov
  5. 5Will Mamdani raise corporate taxes before 2027? - Kalshikalshi.com
  6. 6Will Mamdani raise corporate taxes before 2027? | Politics Prediction Markets | Solflaresolflare.com

9. What evidence from Q2-Q3 2026 budget negotiations indicates whether Governor Hochul's opposition to corporate tax increases is softening?

Hochul's Stance on Corporate TaxesOpposition did not broadly soften during Q2-Q3 2026 budget negotiations [1][2][3]
Statewide Corporate Taxes OutcomeEnsured budget would not raise statewide corporate taxes [1][2][3]
Alternative ConcessionAgreement to NYC surcharge on second homes valued over $5 million (May 7 deal) [1][2][4]
During the Q2-Q3 2026 FY2027 state budget negotiations, Governor Hochul consistently opposed corporate tax increases. Her opposition to corporate tax increases did not broadly soften [1][2][3], and she was explicitly credited with ensuring the state budget would not raise statewide corporate taxes [1][2][3]. This stance was maintained despite pushes from figures like Assemblymember Mamdani and their supporters for steeper income and corporate tax hikes [1][2][3].
Negotiations led to alternative revenue sources, not corporate tax hikes. Hochul specifically opposed Mamdani's efforts to increase New York City corporate tax rates and implement steeper corporate tax hikes [2][4][3]. As a negotiation concession, an alternative was agreed upon in the May 7 deal: a New York City surcharge on second homes valued over $5 million [1][2][4]. This resolution demonstrated Hochul's preference for opting for alternatives and paring back "ambition" rather than endorsing higher corporate taxes, reinforcing her consistent stance against such increases [1][2][3].
Sources (4)
  1. 1Hochul reaches budget deal with New York lawmakers, ending 5-week deadlock - syracuse.comsyracuse.com
  2. 2Hochul and New York lawmakers reach state budget dealtimesunion.com
  3. 3NYC Council members to Hochul: Tax the rich (corporations) - City & State New Yorkcityandstateny.com
  4. 4NY Gov. Hochul, top lawmakers strike deal on $268B state budget - Gothamistgothamist.com

10. What Could Change the Odds

Key Catalysts

Mayor Mamdani, who assumed office on January 1, 2026, has centered his platform on increasing taxes for corporations and high-income earners to address the city's budget deficit [1][2][3][4][5][6][7]. During his mayoral campaign, he advocated for raising New York State's highest corporate income tax rate from 7.25% to 11.5% [8][9][10][11][12].
In March 2026, his administration presented a revised plan for New York City, proposing narrower corporate tax increases: 1.8 percentage points for finance firms, 1.77 points for other corporations, and 0.4 points for large unincorporated businesses [4]. This adjusted proposal represents a smaller increase compared to his initial statewide corporate tax hike ambition [4]. Additionally, a proposed annual surcharge on luxury second homes in New York City valued above $5 million is projected to generate $500 million annually [13][14][15]. Another change aims to generate nearly $1 billion in city revenue and would affect businesses structured as pass-through entities [16][17].
While some of Mamdani's broader tax increase proposals, particularly those requiring state approval, have faced challenges, Governor Hochul has shown openness to corporate tax hikes [9][4]. The state Legislature has also historically supported increasing taxes on wealthy New Yorkers and has included corporate tax rate increases in their budget proposals [9][12].

Key Dates & Catalysts

  • Expiration: January 08, 2027
  • Closes: January 01, 2027
Sources (17)
  1. 1wikipedia.orgen.wikipedia.org
  2. 2ballotpedia.org
  3. 3wikipedia.orgen.wikipedia.org
  4. 4nysfocus.com
  5. 5aljazeera.com
  6. 6prolewiki.orgen.prolewiki.org
  7. 7pbs.org
  8. 8cato.org
  9. 9cityandstateny.com
  10. 10focusresourcesinc.com
  11. 11empirecenter.org
  12. 12cityandstateny.com
  13. 13ctvnews.ca
  14. 14nyc.gov
  15. 15manhattan.institute
  16. 16city-journal.org
  17. 17nyc.govcouncil.nyc.gov