New York Sues Polymarket Over Illegal Gambling Claims
New York Attorney General Letitia James filed suit on 24 September 2026 against prediction market platform Polymarket, alleging that its event contracts, particularly those tied to sporting outcomes, amount to illegal gambling under New York state law. The case is the most direct state-level challenge yet to the prediction market model and lands squarely in the middle of an unresolved dispute between state regulators and the US Commodity Futures Trading Commission over who actually governs these platforms. For accounting firms, auditors, and CFOs, the filing is not a background news item: it is a live jurisdictional and compliance signal that demands attention.
What the Lawsuit Actually Alleges
The complaint centres on Polymarket's sporting event contracts, which the AG's office argues are not genuinely informational instruments but are, in its words, "quintessentially wagering" dressed up as prediction market products. The filing specifically points to a mobile app Polymarket launched in December 2025, including how the platform advertised its products to New York residents.
Key claims in the filing
State officials contend that Polymarket deliberately structured its offering to sidestep New York's gambling regulatory framework by labelling contracts as "event contracts" on a "prediction market." The suit also signals that officials may seek to block New York residents from accessing the platform entirely, a remedy that would have immediate practical consequences for any US-based firm or client currently using Polymarket for hedging, research, or investment purposes.
The language in the complaint is pointed: the AG's position is that Polymarket is seeking to avoid the legal and financial consequences of New York's close regulation of gambling. That framing matters for accountants and auditors because it suggests the state views the contracts as gambling instruments, not financial derivatives, a classification distinction with direct balance-sheet and tax consequences.
The Broader Pattern: Kalshi, Coinbase, and Gemini
The Polymarket action does not sit in isolation. New York filed a materially similar lawsuit against prediction market platform Kalshi in July 2026. Before that, Coinbase and Gemini faced state-level litigation over prediction market activity in April. The September filing against Polymarket is the third major state enforcement action in less than six months, a pattern that signals coordinated state-level pressure rather than a series of one-off disputes.
New Jersey's parallel proceeding
Earlier in September 2026, New Jersey officials sought to have a court hear arguments on their own Kalshi case, explicitly framing it as a vehicle for clarifying which level of government, state or federal, should oversee prediction markets. As of the date of this article, the court had not announced whether it would weigh in on that jurisdictional question. A ruling, when it comes, could reshape the compliance landscape for every platform operating in this space and, by extension, for every firm that accounts for, audits, or advises clients engaged with these platforms.
The Federal-State Jurisdiction Fault Line
CFTC Chair Michael Selig has publicly asserted that the CFTC holds exclusive jurisdiction over prediction market platforms, a position that would effectively pre-empt state gambling laws. New York's AG is pressing ahead regardless, and the legal tension between these two positions is now being tested in live litigation.
Why this matters for accounting and audit teams
From a professional standpoint, the jurisdictional dispute creates a genuinely ambiguous classification environment. If federal jurisdiction prevails, event contracts on regulated prediction markets would likely be treated as CFTC-regulated derivatives, with the accounting and disclosure obligations that follow. If state law governs, those same contracts may be classified as gambling instruments, a category with entirely different revenue recognition rules, tax treatment, and potential prohibition on institutional participation.
Audit teams cannot wait for the courts to resolve this. Engagement risk assessments, client onboarding reviews, and going-concern disclosures for any entity with material prediction market exposure need to reflect the uncertainty now, not after a final ruling. Any crypto compliance reporting framework that does not yet flag prediction market positions as a jurisdiction-sensitive item needs updating.
Accounting and Tax Implications for Firms and CFOs
The classification question has direct, practical consequences for how positions on prediction market platforms appear in financial statements and tax returns.
Revenue recognition and balance sheet treatment
Under US GAAP, contracts that qualify as derivatives under ASC 815 are measured at fair value through earnings. If a court or regulator ultimately classifies sporting event contracts as gambling instruments rather than derivatives, that accounting treatment changes. Winnings might be recognised on settlement, losses may not be deferrable, and the entity could face questions about whether such activity is consistent with its stated business purpose, particularly for regulated financial institutions.
CFOs at firms that have recorded prediction market positions as financial instruments should run a scenario analysis: what does the balance sheet look like if those positions are reclassified? What disclosures are required under ASC 275 (risk and uncertainties) or under MD&A given live litigation against the platform itself?
Tax treatment uncertainty
The IRS has not issued specific guidance on prediction market contracts. If the contracts are treated as gambling under state law, federal tax treatment may follow the gambling income and loss rules rather than the capital gain or ordinary income rules that apply to financial derivatives. Gambling losses are deductible only to the extent of gambling winnings for individual filers, and the rules for corporate entities engaging in gambling activity are more restrictive still. Firms advising clients on their tax positions in this area should document the legal uncertainty explicitly and consider whether disclosure under IRC Section 6662 penalty avoidance standards is warranted.
AML and KYC exposure
A platform subject to active state enforcement for unlicensed gambling activity sits in a complicated position from an AML perspective. If Polymarket is ultimately found to have operated without required state licensing, transactions through the platform during that period may require retrospective review. Firms using AML and blockchain behavioral detection for suspect wallets should ensure that prediction market wallet addresses are included in their transaction monitoring scope, particularly for clients with high-volume activity on these platforms.
This is not a hypothetical concern. As covered in our analysis of how the Binance DOJ Iran sanctions probe raises exposure for crypto accounting teams
FAQ
Does the New York lawsuit mean Polymarket contracts are illegal nationwide?
No. The lawsuit is a state-level action under New York gambling law. It does not automatically affect Polymarket's status in other states or at the federal level. However, it does create legal uncertainty about whether New York residents can lawfully access the platform, and the outcome could influence other states' approaches.
How should an auditor classify prediction market contracts on a client's balance sheet right now?
Until the jurisdictional question is resolved, auditors should assess whether the contracts meet the definition of a derivative under ASC 815. If they do, fair value accounting applies. If there is genuine doubt about classification, that uncertainty should be disclosed under ASC 275 and flagged in the audit report. Document your reasoning thoroughly.
What tax rules apply to prediction market gains and losses for a US corporate entity?
There is no IRS guidance specific to prediction market contracts. If the contracts are ultimately classified as derivatives, standard derivative taxation rules apply. If classified as gambling, corporate gambling loss deductibility is significantly restricted. Given the live litigation, firms should document the uncertainty and consider whether a disclosure position is appropriate.
Can a firm continue to use digital asset accounting software to track prediction market positions during active litigation?
Yes, digital asset accounting software can still record and track positions, but the software's output is only as good as the classification inputs. Firms need to ensure the contract type, jurisdiction flag, and regulatory status fields accurately reflect the current legal uncertainty rather than assuming a settled treatment.
What should a CFO do immediately if the company has material Polymarket exposure?
Three immediate steps: first, quantify the exposure and assess materiality thresholds. Second, review whether current disclosures in financial statements and MD&A adequately reflect the litigation risk facing the platform itself. Third, consult legal counsel on whether the company's own participation in a potentially unlicensed gambling operation creates any secondary liability under state law.