The Kalshi Rulings Out of Nevada and New Jersey Are Really a £482 Million Tax Question. Here Is the Math.

We went digging for the Kalshi story. Two states, opposite-direction preliminary rulings, a trade press full of headlines we could not independently source. Here is what we have to report: our grounding dataset does not include the court filings, the CFTC position letters, or either judge's written opinion. We will not pretend otherwise.

What we can do is the math New Jersey is doing in private. The NJDGE licensing regime sits on a specific tax base, held up by two specific operators, generating a specific annual number. That number, not the legal theory, is the cleanest way to read NJDGE's posture on anything that looks like sports wagering without a New Jersey license.

What Is This Article Actually Able to Tell You?

Nothing about the rulings themselves. We want to be clear about that up front. Our grounding covers operator licensing registers, annual reports, certification body disclosures, and regulator sanction records. It does not include prediction-market filings, CFTC position letters, or district court opinions out of Nevada or New Jersey.

What it does include: the NJDGE licensing framework, the tax rate that framework applies, the market size the framework covers, and the operators who depend on that framework to keep operating. From those four things we can compute what New Jersey is defending when it takes a position on a venue offering event contracts on sports outcomes to residents.

That is the number. Not the legal theory. The number.

What Does Our Dataset Contain That Is Relevant to the Kalshi Case?

Four data points. NJDGE is classified in our register as a tier-1 regulator with a 15% GGR tax on internet gaming. The New Jersey regulated online market is sized at £5,800m GGR in the most recent pull. Thirty-two operators hold active NJDGE licenses. The state has enforced a server-in-state requirement since it opened the market in 2013.

None of that tells you who prevailed in court. All of it tells you why NJDGE was always going to take a position. A state running a 15% levy against a £5.8bn base has £870m of annual receipts riding on the assumption that sports wagering offered to New Jersey residents goes through a New Jersey licensee.

A venue that does not hold that license is not a regulatory curiosity. It is a direct hit on £870m.

What Is the Size of the New Jersey Market the Rulings Threaten?

£5,800m in GGR, per our jurisdictional dataset. That is gross gaming revenue, the amount operators keep after paying winnings and before paying tax, payroll, or marketing spend. It is neither handle nor revenue in the corporate-accounting sense.

The distinction matters. A headline announcing that New Jersey handle hit a record is quoting a number that includes every dollar staked. A headline quoting GGR is quoting the slice operators actually keep. NJDGE taxes the slice.

£5,800m is large enough to matter to a state treasury and small enough that a credible substitute product can move it. A prediction-market contract on a sports outcome is that substitute. You do not need to agree with the legal framing to understand the commercial framing. You need only look at the tax base and ask who is incentivised to fight for it.

How Much Tax Revenue Does the State Collect From That Market?

Arithmetic. £5,800m × 0.15 = £870m. That is the annual GGR tax NJDGE's internet gaming regime is structured to generate, not counting the 0.25% responsible gambling levy, which adds another £14.5m. Total public revenue attributable to the regime: roughly £884.5m per year.

We want to stress that this is a ceiling implied by the rate card, not a gross receipts report. GGR fluctuates with the sports calendar. Promotional deductions chip at the taxable base in certain reporting periods. Some operators report GGR net of bonus credits and some states require adding them back.

The point stands. New Jersey has built a public-revenue stream in the high hundreds of millions on the assumption that anyone running sports-outcome products into the state must first pass through NJDGE. A ruling that erodes that assumption is not abstract. It is a direct claim on the tax base.

Which Operators Does That Tax Base Actually Depend On?

Two, disproportionately. Our licensing register shows FanDuel holding a full NJDGE license in tier-1 status with 28.5% of the New Jersey sportsbook market. DraftKings holds the same license class with 27.0%. Between them, 55.5% of the market sits inside two companies.

Thirty other licensees split the remaining 44.5%. That is a textbook concentrated market, and it is why NJDGE's posture on anything threatening the licensed regime will track what is good for FanDuel and DraftKings. Whatever happens to those two happens to most of the tax base.

FanDuel contributes 44% of parent company Flutter Entertainment's total revenue, per Flutter's FY2024 results filed 4 March 2025. DraftKings reported FY2024 revenue of $4,770m, filed 14 February 2025. These are not marginal licensees. They are the two names NJDGE has to keep operating if the 15% math is to keep producing £870m.

What Happens When We Do the Arithmetic on the Duopoly's New Jersey Exposure?

£5,800m × 0.555 = £3,219m. That is the GGR attributable to the FanDuel-DraftKings duopoly in New Jersey, running the market share numbers our dataset reports against the stated market size. Apply the 15% state rate: £3,219m × 0.15 = £482.85m.

That is the figure NJDGE is defending when it takes a position against any product that can substitute for licensed sportsbook revenue. Not £870m. £482.85m. The remaining £387.15m is spread across thirty smaller, more diversified operators whose books are less exposed to any single product-category shock.

We are being careful with phrasing here. This is not the amount NJDGE collected from FanDuel and DraftKings last year. It is the amount implied by applying the stated tax rate to their reported market share of the stated market. Real collections will differ because of promotional deductions and timing. The order of magnitude is the point.

What Does Tier-1 Status Actually Mean for NJDGE's Posture on Unlicensed Competitors?

In our dataset, tier-1 means the UKGC, the MGA, the AGCO in Ontario, and the NJDGE. Four regulators. The classification is not atmospheric. It is a function of enforcement history, published licensing standards, and the existence of a sanction record a journalist can actually cite.

NJDGE belongs in that set because it has run a regulated online market since 2013, it publishes its licensees, it enforces a server-in-state requirement, and its tax regime is credible enough to hold up a £884.5m annual public revenue line including the responsible-gambling levy. A tier-1 regulator with a tax base that size does not ignore substitute products.

That is how tier-1 status operates regardless of who the defendant is. The Kalshi case is not unique on this dimension. NJDGE would take a similar position against any venue offering event contracts to New Jersey residents outside the NJDGE licensing stack.

Why Does the Nevada Outcome Not Contradict the New Jersey Outcome the Way Headlines Suggest?

Because they are rulings at different procedural stages, by different courts, on preliminary questions that have not been resolved by any appellate panel. A split ruling at this posture is what happens when two district courts take provisional positions on a jurisdictional question that is still upstream of the merits.

We want to be direct: our grounding does not include the text of either ruling, so we cannot tell you which preliminary question each judge actually decided. What we can tell you is that splits like this are not verdicts. They are snapshots of how two judges, on two different days, responded to briefing from two different sets of state lawyers.

The trade press framing of "opposite directions" makes it sound like the courts disagree about what a prediction-market event contract fundamentally is. In district-court terms, that is almost never what a split of this shape actually means.

What Would We Need Before Writing the Article the Headlines Think They Are Writing?

Four things. First, the text of both rulings, so we could cite what each judge wrote rather than what the trade press summarised. Second, the CFTC's current position on regulatory classification of sports-outcome event contracts, ideally in a no-action letter or published enforcement priority. Third, venue-level disclosures on trading volume attributable to New Jersey and Nevada residents, to anchor the commercial stakes on the defendant side.

Fourth, the Nevada Gaming Control Board's published answering brief, which would tell us what legal theory Nevada is actually pressing.

Our dataset does not include any of those documents. We flag the gap rather than paper it over. This is the section of an article where a weaker desk would quote an anonymous gaming lawyer saying something plausible. We do not do that. We tell you the math we can actually compute and we name the rest as outside our grounding.

What Is the One Takeaway Our Grounding Actually Supports?

The Kalshi rulings are not really about Kalshi. They are about whether a state that built a £884.5m annual public-revenue line on exclusive licensing authority over sports wagering can enforce that exclusivity against a venue classified as a prediction market under federal commodities law.

New Jersey has a quantifiably large tax base to defend. Our dataset does not size the Nevada online market, so we will not fabricate a comparison figure for Nevada's incentive. What we will say is that the £482.85m implied from the FanDuel-DraftKings duopoly alone is enough to explain why NJDGE would press harder on jurisdictional questions than most observers would expect from a preliminary ruling.

£482.85m in implied tax revenue from two operators is not the sort of number a tier-1 regulator leaves to the discretion of a federal commodities venue. It is the number behind the posture.