Kalshi traders see US inflation easing from its 2026 peak, but not falling quickly: they put September’s annual consumer price increase at 3.6% and assign just under a one-in-three chance that inflation sets a new high this year. The September consumer price index (CPI) figure is due Wednesday at 8:30 a.m. ET. The market view points to slower price growth ahead, not an imminent return to low inflation.
September forecast implies a modest rise
Kalshi traders expect the September CPI to be 3.6% higher than a year earlier, matching the FactSet consensus estimate. If confirmed, that would be an acceleration from August’s 3.4% annual increase, so the near-term reading would rise even as traders judge a fresh 2026 peak unlikely.
The forecast is for the overall CPI, which tracks changes in consumer prices. It should not be confused with a month-to-month change: the 3.6% figure is year over year. The Bureau of Labor Statistics’ scheduled release on Wednesday will establish whether the official September reading matches the market’s expectation.
Markets put limited odds on a new high
Inflation previously reached a 2026 high of 4.2% in May. Against that benchmark, Kalshi traders place the odds of inflation reaching a still-higher level at any point this year at just under one in three. That is a probability implied by trading in contracts, not a guarantee about the next CPI reports.
Kalshi offers contracts tied both to September’s CPI level and to whether inflation crosses specified levels at any time in 2026. Those contracts are settled using official Bureau of Labor Statistics data. Their prices therefore offer a snapshot of traders’ expectations, while the government release remains the measure that determines the reported inflation rate.
Core prices are expected to stay firm
For core inflation, which excludes food and energy price changes, the forecast is 2.4% year over year. That expectation also matches the FactSet estimate. The contrast matters: traders see little chance of a new high in overall inflation, but they expect underlying price growth to remain elevated through the rest of 2026.
Kalshi contracts put the chance that annual core inflation falls below 2.2% this year at just 6%. Annual core inflation was last below that threshold before the inflation spike that began in 2021. The market’s outlook therefore suggests that a retreat from the peak would not necessarily bring core inflation below a level it has not crossed since before that surge.
What the forecast can—and cannot—say
Prediction-market odds translate traders’ positions into probabilities for defined outcomes. Here, the distinction between a 3.6% September CPI forecast and the probability of a new annual high is important: one concerns a particular monthly release, while the other concerns whether inflation exceeds earlier levels at any point in 2026.
Neither the September forecast nor the contracts settle the direction of prices beyond their stated terms. The official CPI release will test the near-term estimate, and subsequent Bureau of Labor Statistics readings will determine whether inflation stays below May’s 4.2% peak. For core inflation, the 6% probability attached to a drop below 2.2% signals how unlikely traders consider that threshold this year—not that the outcome is impossible.
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The forecasts described here are tied to Kalshi contracts and should be read as market expectations rather than official inflation projections. The FactSet consensus estimates provide a separate comparison for both September’s 3.6% headline CPI forecast and the 2.4% core inflation forecast.
Takeaway: Kalshi traders see a low chance of inflation setting a new 2026 high, but expect core inflation to remain stubbornly above 2.2%.
