Scan: Will legislation increasing New York City's property tax rate become law in New York City before Jan 1, 2027? — Yes

1. Planner Opus 5.5 · picks the research tools

Tools chosen: kalshi_direct resolution_source kalshi_related polymarket_related article_search

Planner reasoning

Kalshi price is the anchor. Related markets on Mamdani's tax agenda give cross-venue signal. NYC property tax rates are set each June by the City Council when it adopts the budget, so the one specific fact that matters is whether the FY2027 rate resolution (adopted June 2026) raised the rate. Most of the remaining window falls outside the normal rate-setting cycle.

2. Research parallel tool calls + 4 web research loops (Sonnet 5) · read raw by the forecasters

at a glance

RESEARCH DIGEST (built in code: tool summaries and each report's bottom line; the forecasters read the full tool outputs and reports) Tools - kalshi_direct: ## This Market's Kalshi Data **Yes** (KXNYCPROPERTYTAX-27JAN01) - Current price (probability): 7.80% (live; bid 8% / ask 13%) - 7-day price change: -5.20% - 30-day price change: -7.20% - Average daily volume: 97 contracts - Price range: 5.80% - 15.00% - Data points: 78 days - resolution_source: already_resolved=unclear; matches_criteria=False; last_updated=2025 (per site footer '© City of New York. 2025'). The page lists NYC property tax rates by class for tax years 2025 and 2026 (e.g., Class 1: 20.085% in 2025, 19.843% in 2026), along with historical archives back to 1981, but shows a decrease rather than increase for most classes in 2026 and does not reference any specific legislation - kalshi_related: 3 related markets / summaries. series KXNYCPROPERTYTAX: 0 markets (skipped 1 no-signal) | keyword 'Mamdani tax': ok | keyword 'NYC tax': ok | keyword 'New York millionaire tax': ok - polymarket_related: Polymarket search over 2 keyword(s), kept 1 matches. keyword 'NYC property tax': 1 markets | keyword 'Mamdani tax': 0 markets - article_search: Fetched 16 unique articles across 2 queries (lookback=180d). 'NYC Council FY2027 property tax rate resolution adopted 2026 rate change': 8 articles | 'Mamdani property tax rate increase City Council': 8 articles Research loops, bottom lines - current state: The only concrete proposal to raise NYC's general property tax rate (Mamdani's 9.5% "last resort" hike) was explicitly abandoned in May 2026 after new state funding was secured, and the Council's adopted FY2027 budget (June 30, 2026) proceeded without any general rate increase; as of early October 2026 there is no sign of a revived rate-increase bill moving through the Council or Albany before the Jan 1, 2027 deadline. - base rate: The base rate for a broad NYC property-tax-rate increase becoming law is very low historically (roughly once in ~35 years, 2003), and the one serious 2026 attempt (Mamdani's 9.5% hike) was proposed, met political resistance from the City Council, and was formally withdrawn/reversed before the FY2027 budget was adopted on June 30, 2026. A narrower state-enacted "pied-à-terre" surcharge on high-value non-primary NYC residences did become law in May 2026, but this is a distinct, targeted mechanism - yes case: The strongest concrete path to YES is not a revived general rate hike but the still-pending, legally mandatory FY2027 final class-rate certification (the Council has not yet published final 2026-27 rates as of September 2026), which — following the exact precedent of the October 29, 2025 FY2026 revision — has historically raised at least one class's nominal property tax rate even while the headline rate stayed flat, and which must be completed via Council resolution well before January 1, 2027. - no case: The sole legislative vehicle that would unambiguously satisfy a common-sense reading of "legislation increasing NYC's property tax rate" — Mamdani's 9.5% broad hike — was withdrawn in May 2026 and the Council's June 30, 2026 budget deliberately substituted other revenue measures instead; the only rate-setting document that did become law (the routine annual Res./M 82-2026) left most classes flat or lower and reflects ordinary annual recalibration rather than new rate-increasing legislation, and Crux follow-up - The primary legislative record (Legistar) shows that the City Council did formally pass a Fiscal 2027 Tax Fixing Resolution on June 30, 2026, that set the Class 1 rate at 20.909%, up from 19.843% — on its face a legally enacted, immediately effective rate increase for one major property class, even though the Mayor's broader general 9.5% hike was separately abandoned. However, a specific, recent third-party source (dated as late as September 30, 2026) directly disputes that any new rate has actu

tools

tool	status	time	items	summary
kalshi_direct	OK	0.2s	1	## This Market's Kalshi Data Yes (KXNYCPROPERTYTAX-27JAN01) - Current price (probability): 7.80% (live; bid 8% / ask 13%) - 7-day price change: -5.20% - 30-day price change: -7.20% - Average daily volume: 97 contracts - Price range: 5.80% - 15.00% - Data points: 78 days
resolution_source	OK	6.9s	1	already_resolved=unclear; matches_criteria=False; last_updated=2025 (per site footer '© City of New York. 2025'). The page lists NYC property tax rates by class for tax years 2025 and 2026 (e.g., Class 1: 20.085% in 2025, 19.843% in 2026), along with historical archives back to 1981, but shows a dec
kalshi_related	OK	5.0s	3	3 related markets / summaries. series KXNYCPROPERTYTAX: 0 markets (skipped 1 no-signal) \| keyword 'Mamdani tax': ok \| keyword 'NYC tax': ok \| keyword 'New York millionaire tax': ok
polymarket_related	OK	0.5s	1	Polymarket search over 2 keyword(s), kept 1 matches. keyword 'NYC property tax': 1 markets \| keyword 'Mamdani tax': 0 markets
article_search	OK	46.3s	16	Fetched 16 unique articles across 2 queries (lookback=180d). 'NYC Council FY2027 property tax rate resolution adopted 2026 rate change': 8 articles \| 'Mamdani property tax rate increase City Council': 8 articles

research loops · 4/4 ok · 15 searches · 7 page reads

dimension	status	time	searches	page reads	report
current state	OK	42s	5	2	5622 chars
base rate	OK	54s	5	2	5600 chars
yes case	OK	56s	3	1	4682 chars
no case	OK	64s	2	2	6028 chars

report: current state

- [2026-02-17] Mayor Mamdani released the FY2027 Preliminary Budget assuming a 9.5% property tax rate increase as a "last resort," raising the overall rate from roughly 12.28% to 13.45%, projected to generate "a 9.5 percent property tax rate increase — generating $3.7 billion in FY 2027." https://www.nyc.gov/mayors-office/news/2026/02/mayor-mamdani-releases-balanced-fiscal-year-2027-preliminary-bud - [2026-02-17] City Council Speaker Julie Menin already voiced her opposition to any property tax increases , and the plan would have needed Council approval. https://www.amny.com/news/mamdani-property-tax-increase-homes-renters/ - [2026-03-10] State lawmakers did not back the companion proposal; neither the Senate nor Assembly signed onto Mamdani's proposal for a new 1-percent property-tax surcharge on homes valued over $5 million . https://nysfocus.com/2026/03/10/senate-assembly-mamdani-tax-hikes - [2026-05-12] Mamdani abandoned the property-tax-increase proposal after securing new state funding: New York City Mayor Zohran Mamdani (D) has abandoned his controversial proposals to raise property taxes or use reserves to close the city's deficit after securing $4 billion in new funding from the state, and confirmed during his presentation that the property tax proposals are no longer moving forward. https://www.taxnotes.com/featured-news/mamdani-halts-proposed-new-york-city-property-tax-hike/2026/05/12/7w3wl - [2026-05-28] The Comptroller's review of the Executive Budget confirms: "The single largest change in the May Plan relative to February 2026 is the complete reversal of the proposed property tax rate increase... In the February Plan, the Mayor proposed raising the property tax rate from 12.28 percent to 13.45 percent starting in FY 2027... The May Plan abandons this proposal entirely." https://comptroller.nyc.gov/reports/comments-on-new-york-citys-executive-budget-for-fiscal-year-2027-and-financial-plan-for-fiscal-years-2026-2030/ - [2026-06-30] The City Council adopted the FY2027 budget; the Comptroller's report on the Adopted Budget states these alternative measures "replace other, more problematic solutions proposed by the Mamdani administration in the Preliminary Budget, and subsequently reversed in the Executive Budget, including a highly inequitable property tax increase." https://comptroller.nyc.gov/reports/comments-on-new-york-citys-fiscal-year-2027-adopted-budget/ - [2026-06-30] The Council also adopted File M 0082-2026, a "Report of the Committee on Finance in favor of approving a resolution... fixing the tax rate for the Fiscal Year 2027," which passed Council the same day (status: Adopted/Pass) — this is the routine annual rate-setting resolution, separate from the abandoned 9.5% hike proposal. https://legistar.council.nyc.gov/LegislationDetail.aspx?GUID=EF96F0F4-BD13-4F60-8219-B6DEB00D6D04&ID=8123539&Options=&Search= - [2026-07-01] A separate, already-enacted measure unrelated to the base property tax rate — the state-level pied-à-terre ("non-primary residence") surcharge — took effect July 1, 2026 as part of the state budget signed May 28, 2026; this is a new surcharge on non-primary luxury residences, not an increase in the general NYC property tax rate. https://rsmus.com/insights/tax-alerts/2026/new-york-budget-federal-conformity-rates-property-tax.html - [2026-09-02, updated 2026-09-30] A property-tax advisory source reports that "the city has still not adopted tax rates for the 2026-27 fiscal year, so bills are charged at the 2025-26 rates until the City Council votes… No 2026-27 rate is published as of September 2026, and Finance says... 'We cannot calculate your 2026-27 property tax until the new tax rate is established by the city council.'" This suggests that while a procedural rate-fixing resolution (M 0082-2026) passed in June, the Department of Finance had not yet published/finalized operative 2026-27 class rates as of late September 2026, with finalization sometimes slipping to November. https://mgnyconsulting.com/how-nyc-property-tax-works/ - [2026-09-29] In an unrelated but contemporaneous property-tax matter, a court ordered the city's mailed pied-à-terre surcharge notices cancelled; the City appealed the same day and says the ruling is on hold — this concerns the separate surcharge, not the general tax rate. https://mgnyconsulting.com/how-nyc-property-tax-works/ - [2026-10-09] No news found of any revival of the mayor's 9.5% property-tax-rate-increase proposal since it was dropped in May 2026; the FY2027 adopted budget (effective July 1, 2026) does not include a general property tax rate increase, financing the gap instead via increased state aid, tax-revenue re-estimates, and other non-rate measures. NOT FOUND: The precise final, Department-of-Finance-published FY2026-27 class tax rates (class 1/2/3/4) and confirmation of whether the June 30, 2026 "rate-fixing" resolution (Res. 546/M 0082-2026) set rates at an increase or held them flat/roll-forward; could not retrieve the full text of Res. 546 to confirm this. No evidence found of any new legislative push (state or city) to raise the general property tax rate between May 2026 and October 2026. BOTTOM LINE: The only concrete proposal to raise NYC's general property tax rate (Mamdani's 9.5% "last resort" hike) was explicitly abandoned in May 2026 after new state funding was secured, and the Council's adopted FY2027 budget (June 30, 2026) proceeded without any general rate increase; as of early October 2026 there is no sign of a revived rate-increase bill moving through the Council or Albany before the Jan 1, 2027 deadline.

report: base rate

- [2026-05-26/28] The NY State Legislature and Governor Hochul enacted a NYC "pied-à-terre" property tax surcharge as part of the FY2026-27 state budget — a rare example of a state-driven NYC property tax increase becoming law, but distinct from a general citywide rate hike. The New York State Legislature on May 26, 2026, enacted the 2026-2027 New York State Budget Bill, which amends Article 30-C of the Tax Law adding sections on a "City Surcharge on Property That Does Not Serve as a Primary Residence," effective July 1, 2026. - [2026-02-17] Mayor Mamdani's FY2027 preliminary budget proposed a broad-based 9.5% property tax rate hike as a "last resort," a proposed "last resort" property tax rate increase, described as a contingency if other revenue options are not adopted, effectively calculating to about +10.1% for FY 2027 . - [2026-02-24] Legal commentary noted this type of broad rate hike is one of the only tax levers NYC controls without Albany's approval: New York City may be headed toward a broad-based increase in local property taxes, one of the few tax increases that doesn't require approval from Albany, after Mayor Zohran Mamdani proposed a roughly 9.5% property tax hike as a contingency plan. However, final tax-rate resolutions still require City Council passage and mayoral signature. - [2026-02-25] City Council Speaker Julie Menin publicly opposed the increase: The mayor would need the City Council to approve any property tax hikes, but Speaker Julie Menin said in a statement that increases "should not be on the table whatsoever." - [2026-05] The Mayor's Executive Budget reversed the proposed 9.5% increase entirely: In the February Plan, the Mayor proposed raising the property tax rate from 12.28 percent to 13.45 percent starting in FY 2027, generating an estimated $3.70 billion in FY 2027… The May Plan abandons this proposal entirely. - [2026-06] Independent fiscal monitor confirmed the reversal: "The most significant change is the reversal of the proposed property tax rate increase that was projected to generate over $3.6 billion in each of FYs 2027–30. Partially mitigating the reversal is an estimated $500 million in annual revenues from the newly enacted pied-a-terre tax." - [2026-06-30] The City Council's adopted FY2027 budget and tax-rate resolution (M 0082-2026) did not include the broad rate hike; the Council had explicitly rejected it in its budget response: "The Mayor's Preliminary Plan baselines a 9.5% property-tax rate increase to raise about $3.7B over FY26 and FY27. The Council proposes balancing the budget through re-estimates, efficiencies, and other revenue actions in lieu of the rate increase." - [Historical base rate] Outside of 2026, a genuine across-the-board NYC property tax rate increase is a rare event: Since the 1990s, changes in the overall property tax rate have been infrequent. The City enacted an 18.5 percent rate increase effective January 1, 2003; a rate reduction for fiscal year 2008 was repealed the following year, and the rate has been the same since then. That is essentially one major increase in roughly 35 years. - [Process note] Smaller, class-specific rate adjustments occur annually as a routine (not "increase legislation" in the political sense), since each year the City Council sets real property tax rates as part of the budget process, determining the total levy necessary with each of four property classes paying a share; the Council cannot raise or lower the rate for just one class, and the tax rate for each class may increase or decrease from year to year. Some classes often rise even when the overall rate is flat (e.g., FY2024 Class 2 rate rose 23.5 bps even as Class 1 fell). - [Reform track record] Comprehensive property-tax reform efforts have repeatedly stalled: the hope for comprehensive reform dates back to Mayor Dinkins; under Mayor de Blasio, a commission released recommendations that "didn't go far," and Mayor Eric Adams also promised to fix the system but didn't. A 2021 city commission's recommendations never became law. - [2026-03] Mamdani also floated smaller surcharges (a 1% surcharge on $5M+ Class 1/2 properties, mansion tax boost) directly to Albany rather than pursuing them through the City Council rate-setting process; these remained proposals as of the search window and have not been confirmed enacted. One proposal would raise the real property transfer tax on cash-only deals over $1 million, another would create a property tax surcharge of 1 percent on Class 1 and Class 2 properties with a market value of $5 million or more, and a third would boost the city's mansion tax and supplemental tax on properties valued over $5 million. BOTTOM LINE: The base rate for a broad NYC property-tax-rate increase becoming law is very low historically (roughly once in ~35 years, 2003), and the one serious 2026 attempt (Mamdani's 9.5% hike) was proposed, met political resistance from the City Council, and was formally withdrawn/reversed before the FY2027 budget was adopted on June 30, 2026. A narrower state-enacted "pied-à-terre" surcharge on high-value non-primary NYC residences did become law in May 2026, but this is a distinct, targeted mechanism rather than a general property tax rate increase. NOT FOUND: No evidence of any pending 2026 legislation (state or city) currently moving toward final passage that would raise the general/uniform NYC property tax rate before January 1, 2027; no polling or prediction-market-style forecasts (other than the Kalshi contract itself) specifically estimating the odds of this event.

report: yes case

YES means: Binding legislation that raises New York City's property tax rate — most plausibly the Council's finalization of Fiscal Year 2027 class tax rates in a way that increases at least one class rate (or the headline/class rate used for billing) — completes all legal requirements (Council passage and any required certification/waiting period) before January 1, 2027. - [2026-06-30] The Council already adopted "Preconsidered Res 546," the formal FY2027 tax-fixing resolution levying $37,190,000,000 by real property tax, pursuant to the State Constitution, Real Property Tax Law, and NYC Charter — the Council's own agenda frames this as a Finance Committee report "in favor of approving a resolution... fixing the tax rate for the Fiscal Year 2027." https://legistar.council.nyc.gov/View.ashx?GUID=C9F1FB4C-447A-4E12-ABA7-A1EEFF6A2481&ID=15665050&M=F - [2026-09/current] Multiple property-tax trackers confirm that as of September 2026 the Department of Finance was still billing at "2025-26 rates" because "the city has still not adopted tax rates for the 2026-27 fiscal year," with Finance stating: "We cannot calculate your 2026-27 property tax until the new tax rate is established by the city council." This means a further, operative rate-setting action for FY2027 is still outstanding and must occur before the fiscal year's billing can finalize. https://mgnyconsulting.com/how-nyc-property-tax-works/ - [Historical pattern, FY2026] The prior fiscal year's rates were not finalized in the June resolution either: initial June 2025 rates were later superseded by a City Council revision dated October 29, 2025, which produced the FY2026 final rates (Class 1 19.843%, Class 2 12.439%, Class 3 11.108%, Class 4 10.848%). https://www.appealdesk.com/blog/how-much-can-property-taxes-increase-new-york - [Historical pattern, class-level increases] Comparing the pre-revision and post-revision FY2026 rates shows Class 2 rose from 12.340% to 12.439% and Class 4 rose from 10.774% to 10.848% in that October revision, even as Class 1 fell — demonstrating that "flat overall rate" years routinely still contain Council-enacted increases in specific class rates. https://www.rosenbergestis.com/media/blog/nyc-property-tax/new-york-city-property-tax-levy-and-rates-for-fiscal-year-2026 - [2026-01-15] The Department of Finance's FY2027 tentative roll already shows the underlying assessment pressures that typically force such class-rate shifts: Class 1 assessed values rose a further 4.7% and Class 2 assessed values rose 6.2%, continuing the pattern that has pushed Class 2/4 rates upward in recent cycles. https://www.nyc.gov/site/finance/about/press/press-release-fy27-tentative-assessment-roll.page - [Mechanism/prerequisite] Based on this pattern, the most likely path to a technical YES is not a revival of Mamdani's abandoned 9.5% across-the-board hike, but the routine, legally required fall rate-certification resolution (analogous to Res. 546/the Oct 29, 2025 FY2026 revision) in which the Council sets final FY2027 class rates — a vote that, like in FY2026, is likely to raise at least one class's nominal tax rate, finalized via Council resolution (with mayoral role limited/none) well before the January 1, 2027 deadline and in time for the January tax-bill cycle. - [2026-05-28] Separately, the state-enacted pied-à-terre ("non-primary residence") surcharge on NYC property is already fully enacted law, effective July 1, 2026, and constitutes a legislatively created increase in the property tax burden on a defined class of NYC properties, satisfying a broad reading of "legislation increasing New York City's property tax rate" even though it is not a general citywide rate hike. https://rsmus.com/insights/tax-alerts/2026/new-york-budget-federal-conformity-rates-property-tax.html BOTTOM LINE: The strongest concrete path to YES is not a revived general rate hike but the still-pending, legally mandatory FY2027 final class-rate certification (the Council has not yet published final 2026-27 rates as of September 2026), which — following the exact precedent of the October 29, 2025 FY2026 revision — has historically raised at least one class's nominal property tax rate even while the headline rate stayed flat, and which must be completed via Council resolution well before January 1, 2027. NOT FOUND: The specific date or numeric content of the anticipated FY2027 "final" rate-certification resolution (successor to the June 30, 2026 interim Res. 546) had not yet occurred/been published as of early October 2026, so it cannot be confirmed whether any class rate will in fact rise this cycle; could not retrieve the full certified FY2027 rate schedule.

report: no case

YES means: Binding legislation that raises NYC's property tax rate is signed into law (or becomes law without signature, or survives a veto override, with all waiting periods completed) before January 1, 2027 — i.e., Mayor Mamdani's broad-based hike (or some other rate-raising measure) is actually enacted, not merely proposed or passed by one chamber. - [2026-02-17 through 2026-05-12] The only concrete bill that would have "increased New York City's property tax rate" in the plain political sense — Mamdani's 9.5% broad hike — was formally abandoned months ago after the mayor secured $4 billion in new state aid, with Mamdani confirming "the property tax proposals are no longer moving forward." https://www.taxnotes.com/featured-news/mamdani-halts-proposed-new-york-city-property-tax-hike/2026/05/12/7w3wl - [2026-06-30] The Council's actual Fiscal 2027 tax-rate-fixing resolution (Preconsidered Res./M 82-2026), fetched in full, shows the Mayor's June 30 transmittal letter setting the FY2027 real property tax levy at $39,885,078,591 — the routine annual mechanism, not the abandoned 9.5%/"13.45%" headline hike — with the resolution's effective-date clause reading only "This resolution shall take effect as of the date hereof." https://legistar.council.nyc.gov/View.ashx?G=2FD004F1-D85B-4588-A648-0A736C77D6E3&GUID=EFF3C9A6-8CEA-4C99-935A-E4B8089AA97D&ID=15669792&M=F - [2026-06-30] That same fetched resolution's tax-rate table fixes FY2027 "decimal rate on adjusted proportion for all purposes" at 0.20909 for Class 1, 0.12440 for Class 2, 0.11108 for Class 3, and 0.10658 for Class 4 — meaning Class 3 is flat and Class 4 actually fell versus the prior year, so any "increase" is confined to one sub-class rather than a citywide rate hike. https://legistar.council.nyc.gov/View.ashx?G=2FD004F1-D85B-4588-A648-0A736C77D6E3&GUID=EFF3C9A6-8CEA-4C99-935A-E4B8089AA97D&ID=15669792&M=F - [2026-09-02, updated 2026-09-30] Independent of that June 30 Council vote, a consulting-firm tracker reports Finance still had not published operative 2026-27 rates as of late September, explicitly stating owners "will pay the 2025-26 rate" until rates are "established by the city council," which muddies whether the June 30 resolution is even treated by the city's own tax administration as a completed, binding rate-setting act yet. https://mgnyconsulting.com/how-nyc-property-tax-works/ - [2026-09-30] The same tracker notes rates are "frequently not finalized until November," meaning the operative administrative rate for FY2026-27 could still be pending as of the report date, underscoring that the only unambiguous, broad-based "increase" (the 9.5% proposal) never reached enactment at all. https://mgnyconsulting.com/how-nyc-property-tax-works/ - [2026-06-30] Council Finance Committee documents confirm the Council's budget response explicitly substituted "re-estimates, efficiencies, and other revenue actions in lieu of the rate increase" for Mamdani's proposed 9.5% hike, i.e., the body with final say on the rate affirmatively chose not to raise it broadly. (Per Comptroller's June 30 Adopted Budget comments, already cited in prior research.) - [Historical pattern] Comprehensive, headline-style NYC property-tax-rate increases are historically rare — essentially one in roughly 35 years (2003) — reinforcing a strong status-quo prior against any new broad hike appearing and completing enactment in the final ~12 weeks before the Jan 1, 2027 deadline. - [2026-10-03] The only live, moving property-tax-adjacent legal story in early October 2026 is a court fight over erroneous pied-à-terre surcharge notices — a narrow, previously enacted luxury-second-home surcharge — not any new general rate-increase bill; a judge's Sept. 29 order and the City's same-day appeal concern notice administration, not a new rate statute. https://www.planetizen.com/news/2026/10/138535-mamdani-sent-nearly-6000-pied-terre-tax-warnings-homes-didnt-qualify - [Mechanism/technicality] Even if a forecaster read the resolution criteria literally to count any class-specific rate movement as "legislation increasing the property tax rate," such Class 1/Class 2 rate reshuffling happens via the same routine annual resolution every single fiscal year regardless of any mayoral tax-policy fight — it is not what the market's title or the "last resort" framing in all prior coverage was built around, and treating it as a YES trigger would make the contract's real subject (a genuine city-driven hike) moot while being inconsistent with how every source frames this as a "failed"/"abandoned"/"reversed" proposal. - [No revival found] As of October 9, 2026, no search turned up any news of a reintroduced broad rate-hike bill in the Council or in Albany, nor any veto-override fight, nor any pending home-rule message tied to property tax rates — all signals point to continued inertia through the remainder of 2026. BOTTOM LINE: The sole legislative vehicle that would unambiguously satisfy a common-sense reading of "legislation increasing NYC's property tax rate" — Mamdani's 9.5% broad hike — was withdrawn in May 2026 and the Council's June 30, 2026 budget deliberately substituted other revenue measures instead; the only rate-setting document that did become law (the routine annual Res./M 82-2026) left most classes flat or lower and reflects ordinary annual recalibration rather than new rate-increasing legislation, and no evidence shows any new rate-hike bill advancing toward passage with roughly 12 weeks left before the deadline. NOT FOUND: Confirmation of whether NYC's Department of Finance or any official body has since characterized the Class 1 rate move (19.843%→20.909%) in the June 30 resolution as an "increase" for purposes of this specific contract's resolution criteria; any state legislative text proposing a new general city property-tax-rate increase introduced after May 2026; any indication Kalshi or the question sponsor has clarified whether routine annual class-rate shifts would count toward YES.

3. Forecasters 5 draws · Opus 5.5 + GPT-6 Astra + GPT-5.6 Sol · plain mean · re-drawn after crux research

crux research

The first round disagreed: the independent draws span 0.06 to 0.96 (spread 0.90 >= 0.15). One more research loop went after the crux and every draw below was redone with its report.

first-round draws: 6%, 6%, 22%, 22%, 96% · crux loop: 4 searches, 3 page reads

report: crux

CRUX: Whether the New York City Council's routine, annual "Tax Fixing Resolution" for Fiscal Year 2027 (Res. No. 546/M 0082-2026), which the official Legistar record confirms was formally adopted and took effect on June 30, 2026, already satisfies the market's "legislation increasing NYC's property tax rate" condition — as distinct from Mayor Mamdani's broader "last‑resort" 9.5% across‑the‑board hike, which was abandoned in May 2026. - 2026-06-30: NYC Council Legistar's official record for File #M 0082-2026 (the Finance Committee report recommending the FY2027 Tax Fixing Resolution) shows a full action history culminating in "City Council — Approved, by Council — Pass" on 6/30/2026, with attached "Res. No. 546," confirming formal Council passage that day (https://legistar.council.nyc.gov/LegislationDetail.aspx?GUID=EF96F0F4-BD13-4F60-8219-B6DEB00D6D04&ID=8123539). - 2026-06-30: The primary text of Resolution 546 (fetched directly from Legistar) sets the Fiscal 2027 "decimal rate on adjusted proportion for all purposes" at 0.20909 (20.909%) for Class 1 (one-, two- and three-family homes), up from the FY2026 rate of 19.843%; Class 2 rises marginally to 12.440% from 12.439%; Class 3 stays flat at 11.108%; Class 4 actually falls to 10.658% from 10.848%. The resolution states "Section 3. Effective Date. This resolution shall take effect as of the date hereof" (https://legistar.council.nyc.gov/View.ashx?G=2FD004F1-D85B-4588-A648-0A736C77D6E3&GUID=EFF3C9A6-8CEA-4C99-935A-E4B8089AA97D&ID=15669792&M=F). - This rate-fixing resolution is an annual, legally mandated recalibration under NYC Charter §1516 and RPTL §1803-a that happens every year regardless of broader tax politics; a nearly identical process and document structure exists for FY2017, FY2025, FY2026, etc. (e.g., https://legistar.council.nyc.gov/View.ashx?GUID=208A1409-0149-441A-8140-16C51ED1758A&ID=4741794&M=F). - 2026-05 (reported): Beginning in FY 2027, the City-funded revenue increase is due not only to an updated tax forecast, but also due to the 9.5 percent proposed property tax increase and the assumed passage of State legislation increasing the corporation tax and the sales tax — this was the Comptroller's preliminary-budget framing before the general hike was dropped; other reporting (cited by all five forecasters) confirms the Mayor's broad 9.5%/10.1% multiplier hike was withdrawn after ~$4 billion in state aid was secured, and the adopted FY2027 budget (also passed June 30, 2026) used other revenue sources instead. - 2026-09/2026-09-30 (third-party consultant, not primary government source): A property-tax consulting firm states "the city has still not adopted tax rates for the 2026-27 fiscal year, so bills are charged at the 2025-26 rates until the City Council votes," and quotes Finance's guidance that "We cannot calculate your 2026-27 property tax until the new tax rate is established by the city council. Until then, you will pay the 2025-26 rate." A companion page from the same firm states bills for the 2026-27 tax year are charged at the 2025-26 rates "because the City Council has not adopted new ones," with fiscal 2027 statements multiplying by 19.8430%, the tax year 2026 class 1 rate . - This creates a direct, unresolved conflict: the official Legistar legislative record shows Council passage of a rate-increasing resolution on June 30, 2026, while a recent (late-September 2026) secondary source claims DOF is still billing at the old, lower FY2026 rate and that the Council "has not adopted" new rates — a discrepancy that could reflect administrative/billing implementation lag distinct from legal enactment, an error/staleness in the consultant source, or possible later Council action superseding or delaying the June 30 resolution's practical effect. - No subsequent news story, DOF press release, or Legistar filing was found definitively reconciling this conflict (e.g., no DOF announcement that FY2027 rates were finalized/published, nor any report of the June 30 resolution being rescinded or amended). - Separately, a state-level pied-à-terre/non-primary-residence surcharge was enacted (effective May 28, 2026, taking effect July 1, 2026) but this is a distinct, additional surcharge rather than a change to the core Class 1–4 ad valorem rate structure, and multiple forecasters note it may not be what the market intends by "property tax rate." BOTTOM LINE: The primary legislative record (Legistar) shows that the City Council did formally pass a Fiscal 2027 Tax Fixing Resolution on June 30, 2026, that set the Class 1 rate at 20.909%, up from 19.843% — on its face a legally enacted, immediately effective rate increase for one major property class, even though the Mayor's broader general 9.5% hike was separately abandoned. However, a specific, recent third-party source (dated as late as September 30, 2026) directly disputes that any new rate has actually been adopted/implemented, creating genuine ambiguity about whether DOF/City practice treats this as a completed, binding rate change versus a still-unresolved process. The evidence leans toward the resolution being a real, enacted, binding legislative act (favoring Yes if the market counts any binding rate-class change), but whether Kalshi's resolution criteria treat this routine, partially offsetting (Class 1 up, Class 4 down) annual recalibration as "legislation increasing NYC's property tax rate" — as opposed to requiring a broad, net rate increase like the abandoned 9.5% hike — remains the unresolved interpretive crux. NOT FOUND: No official NYC Department of Finance press release or publication confirming or denying that FY2027 bills now reflect the 20.909%/12.440% rates from Resolution 546; no explicit statement from Kalshi or the question's drafters on whether routine annual class-rate certifications (as opposed to a broad general-rate hike) qualify as "legislation increasing the property tax rate" for settlement purposes; no reporting reconciling why a consultant site claims rates are unadopted as of late September 2026 despite the June 30, 2026 Legistar record showing Council passage.

claude-opus-5-5 · high effort

62% conf

Yes	9%
No	91%

(0) Resolution check: the condition is not clearly met. The only broad rate increase, Mamdani's 9.5% "last resort" hike, was abandoned in May 2026, according to Tax Notes and the Comptroller. The Council's FY2027 budget adopted on June 30 explicitly used other revenue measures "in lieu of the rate increase." The real ambiguity is Res. 546, the routine annual tax-fixing resolution passed June 30. Per Legistar it raises the Class 1 rate (19.843% to 20.909%) and lowers Class 4. Kalshi has not resolved the market in the more than three months since that vote, and it still trades at about 7.8%. That strongly suggests neither settlement nor traders treat routine class recalibration as "legislation increasing the property tax rate." A late-September consultant source also says Finance has not yet applied new rates. (a) About 12 weeks remain before Jan 1, 2027. (b) Status quo: no broad rate hike is pending in the Council or Albany, so the market resolves No. (c) NO scenario: the year ends with only routine class-rate adjustments and the already-enacted pied-à-terre surcharge, which is a distinct surcharge rather than a rate change. Kalshi treats neither as qualifying. (d) YES scenario: a fall rate-revision resolution, like the Oct 29, 2025 one, raises some class rates and Kalshi takes a literal reading. Alternatively, a sudden fiscal shock revives a general hike, which is very unlikely. I hold slightly above the 7.8% anchor to reflect interpretive and settlement risk around class-level increases.

claude-opus-5-5 · high effort

68% conf

Yes	8%
No	92%

(0) Not met in the intended sense: Mamdani's 9.5% general hike was abandoned in May 2026 and the June 30 adopted budget used other revenue instead. The routine June 30 tax-fixing resolution (Res. 546) reshuffled class rates (Class 1 up, Class 4 down) with no general increase, and the market did not settle on it over 3+ months, so it is evidently not treated as qualifying. (a) About 12 weeks remain. (b) Status quo is No: no general rate-increase bill is pending in the Council or Albany. (c) No: the fall class-rate certification is treated as routine and nothing else happens. (d) Yes: a fall class-rate revision raising some class rate is counted literally by Kalshi, or a fiscal shock revives a hike, which is very unlikely after budget adoption. Anchoring on the 7.8% Kalshi price with a small allowance for the interpretive technicality.

gpt-6-astra · high effort

64% conf

Yes	86%
No	14%

I anchor on Kalshi's 7.8% Yes price, but move substantially upward because the follow-up uncovered specific primary-source evidence that the market may be overlooking: an adopted, immediately effective resolution increasing actual class rates. The Council's June 30 Legistar record and Resolution 546 document Class 1 increasing from 19.843% to 20.909% and Class 2 from 12.439% to 12.440%; the supplied rules do not expressly require an across-the-board increase or exclude binding annual rate-setting resolutions. This is strong evidence of an already-qualifying enactment, but not conclusive settlement evidence because the designated Department of Finance page still shows FY2026 rates and Kalshi's treatment of class-specific recalibration remains unconfirmed. I give the official legislative record substantially more weight than the September consultant claim that rates remain unadopted, while retaining risk that missing procedural information—not merely billing lag—explains the discrepancy. About 84 days remain until January 1, 2027, and if nothing changes, the literal-reading status quo favors Yes from the June enactment without needing another tax bill. A No scenario is that settlement requires an aggregate-rate increase or the June resolution proves procedurally incomplete, with no replacement hike enacted after the broad proposal's withdrawal, documented by the Comptroller's May and adopted-budget reviews. A Yes scenario is acceptance of the existing binding class-rate increase, potentially corroborated by a Finance update before the deadline; my remaining 14% No probability primarily prices classification and source-confirmation risk rather than the weaker secondary-source contradiction.

gpt-6-astra · high effort

58% conf

Yes	72%
No	28%

I anchor on Kalshi’s 7.8% Yes price, but materially revise upward because the follow-up uncovered primary legislative evidence distinct from the abandoned broad tax hike. The official June 30 Legistar record and Resolution 546 document adoption, an immediate-effect clause, and increases in Class 1 from 19.843% to 20.909% and Class 2 from 12.439% to 12.440%. This appears to satisfy the written condition under a class-rate interpretation, since the supplied rules neither require an across-the-board increase nor exclude binding annual resolutions, but qualification for settlement remains unresolved rather than conclusively documented. Approximately 84 days remain until January 1, 2027; no further enactment is necessary if this resolution qualifies, whereas otherwise a qualifying measure must complete all legal requirements before then. If nothing changes, the literal class-rate interpretation favors Yes, while an aggregate-rate interpretation favors No because the Comptroller’s May and adopted-budget reports confirm withdrawal of the general increase. The Department of Finance page still lacks the FY2027 schedule, and September consultant claims contradict the official adoption record; I give the primary legislative record greater weight, but allocate substantial No probability to resolution-source nonconfirmation and classification risk. A No scenario is that Kalshi treats annual class redistribution and the separate pied-à-terre surcharge as outside the contract, with no replacement broad increase enacted amid continuing Council opposition. A Yes scenario is recognition of the already-effective class-rate increases, potentially reinforced by publication of the final Finance schedule or another qualifying fall rate resolution.

gpt-5.6-sol · high effort

69% conf

Yes	93%
No	7%

(0) The condition appears likely already met: the official NYC Council Legistar record shows Resolution 546 passed on June 30, 2026, took effect immediately, and raised the Class 1 rate from 19.843% to 20.909% and Class 2 from 12.439% to 12.440%. The main uncertainty is that the NYC Finance tax-rate page and a late-September consultant report still show or reference the old rates, creating administrative-lag and contract-interpretation risk rather than disproving the enacted resolution. (a) About 12 weeks remain until the January 1, 2027 deadline, during which DOF publication or a further rate-certification action could clarify matters. (b) If nothing changes, the literal status quo favors Yes because the Council resolution remains adopted and immediately effective, although the abandoned broad 9.5% hike remains dead. (c) No results if Kalshi interprets “New York City's property tax rate” as requiring a broad citywide increase, excludes routine class-rate recalibrations and the pied-à-terre surcharge, and no new hike is enacted by the deadline. (d) Yes results if Resolution 546 is recognized under the rule covering legislation not requiring executive approval, or if the expected final certification again raises at least one class rate before year-end. Kalshi's 7.8% Yes price is the anchor, but the primary legislative text documenting an already-passed, immediately effective increase is specific evidence that appears substantially underpriced; the remaining 7% reflects the conflicting implementation evidence and unresolved settlement semantics.

4. Final plain mean of 5 draws · second round

54% (64% confidence)

Yes: 54% No: 46%

Mean of 5 draws (0.09, 0.08, 0.86, 0.72, 0.93) after one crux research pass. (0) Resolution check: the condition is not clearly met. The only broad rate increase, Mamdani's 9.5% "last resort" hike, was abandoned in May 2026, according to Tax Notes and the Comptroller. The Council's FY2027 budget adopted on June 30 explicitly used other revenue measures "in lieu of the rate increase." The real ambiguity is Res. 546, the routine annual tax-fixing resolution passed June 30. Per Legistar it raises the Class 1 rate (19.843% to 20.909%) and lowers Class 4. Kalshi has not resolved the market in the more than three months since that vote, and it still trades at about 7.8%. That strongly suggests neither settlement nor traders treat routine class recalibration as "legislation increasing the property tax rate." A late-September consultant source also says Finance has not yet applied new rates. (a) About 12 weeks remain before Jan 1, 2027. (b) Status quo: no broad rate hike is pending in the Council or Albany, so the market resolves No. (c) NO scenario: the year ends with only routine class-rate adjustments and the already-enacted pied-à-terre surcharge, which is a distinct surcharge rather than a rate change. Kalshi treats neither as qualifying. (d) YES scenario: a fall rate-revision resolution, like the Oct 29, 2025 one, raises some class rates and Kalshi takes a literal reading. Alternatively, a sudden fiscal shock revives a general hike, which is very unlikely. I hold slightly above the 7.8% anchor to reflect interpretive and settlement risk around class-level increases.

Pipeline Timing

Total pipeline time: 338.3s

Per-tool research timings shown in the Research section above.