New York Sues Polymarket Over Illegal Gambling Claims

New York State has filed a lawsuit against Polymarket, the blockchain-based prediction market platform, alleging it has been running an unlicensed gambling operation and skirting the tax obligations that come with regulated gaming. The action, announced on 24 September 2026 by Attorney General Letitia James and Governor Kathy Hochul, asks a court to permanently block Polymarket from doing business in New York until it registers with the state's Gaming Commission and pays at least $100,000 in fines. For accounting firms, auditors, and CFOs whose clients participate in prediction markets, the case lands squarely in the intersection of digital asset accounting, state gambling law, and tax compliance.

What New York Is Actually Alleging

The core of the state's case is straightforward: New York prosecutors argue that Polymarket's event contracts satisfy the legal definition of gambling under state law, and that any entity offering such contracts to New York residents needs a licence from the New York State Gaming Commission. Polymarket, they contend, has never obtained one.

The gambling classification argument

Prediction market contracts let participants stake money on the outcome of real-world events, from election results to economic data releases. New York's position is that this structure, regardless of how it is framed commercially or technologically, amounts to wagering. Attorney General James stated that Polymarket had been "skirting New York's laws" and targeting vulnerable residents, including minors who are "most vulnerable to problem gaming." Governor Hochul echoed that framing, describing the company's conduct as knowingly violating state law.

The tax dimension

Beyond licensing, the complaint specifically accuses Polymarket of avoiding the taxes that attach to regulated gambling operations in New York. The state's position is that this tax revenue funds public schools, youth sports programmes, and problem gambling treatment. That detail matters for accountants: it signals that New York views the tax exposure as real and quantifiable, not merely theoretical, and that any future settlement or compliance pathway will likely include a retroactive tax component.

How This Fits Into a Broader Regulatory Pattern

The Polymarket action is not an isolated event. In July 2026, New York filed a similar lawsuit against rival prediction platform Kalshi. Massachusetts and Rhode Island have also taken legal action against both Kalshi and Polymarket. The parallel enforcement activity reflects a genuine jurisdictional dispute: states argue they have the authority to regulate event contracts as gambling, while platforms and some federal regulators have argued that certain prediction market contracts fall under federal commodity law administered by the Commodity Futures Trading Commission.

Federal versus state jurisdiction: the unresolved question

The federal-versus-state tension is not new in financial regulation, but it is particularly acute here. The CFTC has previously permitted certain event contracts and has approved some prediction market products, which platforms have cited as evidence of federal preemption. New York and other states reject that reading. Courts have not yet delivered a definitive ruling, and until they do, the regulatory status of prediction market contracts remains genuinely unsettled across US jurisdictions. Accounting firms advising clients in this space need to hold that uncertainty in mind when determining how to classify and disclose prediction market exposures. For broader context on how federal regulators are approaching digital asset classification generally, see what the CFTC and SEC tokenization push means for digital asset accounting software.

Polymarket's Response and Business Position

Polymarket's Chief Legal Officer, Neal Kumar, said the company intends to remain in New York and had been in dialogue with state authorities before the lawsuit was filed. Kumar noted that Polymarket was founded in a New York City apartment and now employs more than 350 people in the state. The company's public stance is one of defiance combined with an assertion of good-faith engagement. Whether that posture survives litigation remains to be seen, but it does signal that a negotiated resolution, possibly involving registration and back-tax payment, is not off the table.

Accounting and Tax Implications for Firms and CFOs

Regardless of how the underlying jurisdictional dispute resolves, the New York action creates immediate, practical compliance questions for accounting professionals.

Classification of prediction market gains and losses

The first question any crypto bookkeeping software or digital asset accounting software workflow must answer is: how are prediction market contract gains and losses classified for a US taxpayer? The IRS has not issued specific guidance on event contracts settled on blockchain infrastructure. In the absence of that guidance, practitioners have generally looked to whether the contract is a capital asset, an ordinary income instrument, or, in some cases, a wagering transaction under IRC Section 165(d). If New York's gambling characterisation is upheld by courts, it could push federal practitioners toward treating prediction market activity as wagering for federal tax purposes as well, a classification that carries meaningful differences in how losses are deductible. Firms should flag this exposure in engagement letters and client communication now, not after a court ruling arrives.

State gambling tax exposure for clients

If a client has been an active Polymarket participant based in New York, the question of whether state gambling taxes are owed on winnings becomes live. Regulated gambling winnings in New York are subject to state income tax, and operators are required to withhold and report. Since Polymarket was unlicensed and did not withhold, clients may have unreported gambling income and potentially underpaid state tax. Accounting firms should review whether any such transactions have been reported correctly and, if not, consider voluntary disclosure options. See also our coverage of US Senate crypto tax developments every accounting firm must track for context on the broader federal reporting landscape.

Financial statement disclosures for corporate clients

CFOs at companies that have used prediction markets as hedging tools or that hold equity stakes in prediction market platforms face a separate set of questions. If Polymarket is ultimately barred from operating in New York, that is a contingent liability and a going-concern signal for any entity with material exposure to the platform. Under ASC 450 (Contingencies), a loss contingency that is probable and reasonably estimable must be accrued; one that is reasonably possible must be disclosed. The New York lawsuit clears the "reasonably possible" threshold as of the filing date. Auditors reviewing 30 September or 31 December 2026 year-end financials should expect to see this as a disclosure item for affected clients.

AML and KYC considerations

Firms providing compliance services to prediction market operators also need to consider whether these platforms meet the definition of a money services business under FinCEN rules, which would trigger Bank Secrecy Act obligations including AML programme requirements and suspicious activity reporting. New York's gambling characterisation, if it holds, may prompt FinCEN to revisit how it classifies prediction market operators, adding another layer of uncertainty for compliance teams.

What Firms Should Do Right Now

The regulatory picture is moving quickly and will not resolve in a single court decision. The practical steps below apply whether a firm is advising prediction market operators, corporate users of these platforms, or individual high-net-worth participants.

Immediate actions for accounting and compliance teams

First, inventory client exposure. Identify which clients have transacted on Polymarket or similar platforms and in which states. New York and Massachusetts are actively litigating; Rhode Island has also acted. Other states may follow.

Second, review historical tax filings for prediction market activity. Determine whether gains were reported, and under what character. If a client treated winnings as capital gains but a court later determines they are gambling income, the tax treatment differs and amended returns may be required.

Third, assess financial statement disclosure obligations for any corporate or fund client with material prediction market exposure. The ASC 450 analysis described above should be documented in working papers.

Fourth, update engagement letters. Prediction markets represent an emerging risk area where professional standards around engagement scope are still forming. Clear documentation of what a firm is and is not advising on protects both the firm and the client.

Fifth, ensure that whatever crypto accounting software or digital asset accounting software a firm uses can correctly tag prediction market transactions with the appropriate asset class and tax treatment flags. Most general-purpose tools were not built with event contracts in mind, and manual review of categorisation is warranted.

Frequently Asked Questions

Does the New York lawsuit mean prediction market winnings are taxable as gambling income for all US taxpayers?

Not automatically. The lawsuit reflects New York State's legal position, and courts have not yet ruled on it. Federal tax treatment depends on IRS guidance and potentially on how federal courts interpret the nature of prediction market contracts. For now, practitioners should document the uncertainty and consider the range of possible characterisations when advising clients.

Should clients stop using Polymarket while the lawsuit is pending?

That is a legal question a client's attorney needs to answer. From an accounting and tax standpoint, any new transactions create additional exposure that would need to be reported and classified under an uncertain framework. The risk profile has clearly increased, and clients should be informed of that.

How should a CFO treat a company's existing Polymarket balance in its financial statements?

As a contingent asset with elevated uncertainty. If the platform is barred from operating in New York, access to funds could be affected. Depending on materiality, ASC 450 disclosure may be required. Auditors should request management's assessment of recoverability and include the platform's regulatory status as a subsequent-events consideration.

Does this affect prediction market platforms other than Polymarket?

New York has already sued Kalshi on similar grounds, and both Massachusetts and Rhode Island have brought actions against multiple platforms. Accounting firms should treat the entire prediction market sector as operating under elevated regulatory risk in these states, not just Polymarket specifically.

What is the role of crypto bookkeeping software in managing this type of exposure?

Good crypto bookkeeping software should be able to tag prediction market transactions distinctly from spot trades, staking, or lending activity, because each has a different potential tax treatment. Firms relying on tools that lump all on-chain activity into a single category risk misclassifying these transactions. A manual review layer is advisable until vendor support for event contract classification matures.

Source: The Block