In brief
Polymarket traders assign a 49.5% probability to a 25 basis point rate hike at the Federal Reserve's October 27-28, 2026 meeting, versus a 48.5% chance of no change. Goldman Sachs reversed its forecast to expect another hike after the September move, and the Fed's dot plot median signals one more increase this year. However, Chair Kevin Warsh stressed data dependence, leaving the decision finely balanced.
Introduction
Just one day after the Federal Reserve raised interest rates by 25 basis points at its September 16-17 meeting, the focus has already shifted to the next FOMC gathering on October 27-28. The Polymarket prediction market for that decision shows a near-even split between a 25 bps hike and no change, reflecting genuine uncertainty among traders. This article examines the key factors driving the odds and offers a reasoned outlook.
What to know
The Federal Reserve's September meeting concluded with a unanimous 12-0 vote to raise the federal funds rate target range to 3.75%-4.00% (CNBC). Chair Kevin Warsh described inflation as “too high and has been for too long” (CNBC), and the updated dot plot showed a median projection of 4.1% for end-2026, implying one more 25 bps hike this year (NYT). A 16-2 majority of policymakers expect at least one additional increase in 2026 (CU Today).
Goldman Sachs, which had previously expected only a September hike, reversed its call on September 17 and now forecasts a 25 bps increase in October (Reuters). The bank cited the Fed's hawkish tone, higher inflation forecasts (PCE raised to 3.7% for 2026), and Warsh's comments that the September move was “removing accommodation” rather than tightening (Dark Side of the Boom).
However, Warsh deliberately avoided giving forward guidance, saying he did not want to “prejudge any future decisions” (NYT). The CME FedWatch tool as of September 17 showed a 50.9% probability of a 25 bps hike in October, up from 43.5% a day earlier (Yahoo Finance). The next FOMC meeting is scheduled for October 27-28 (WSJ).
The market numbers
The Polymarket event “Fed Decision in October?” has attracted over $6.3 million in volume and $1.8 million in liquidity. The outcomes and their implied probabilities as of September 17, 2026, are:
| Outcome | Probability |
|---|---|
| 25 bps increase | 49.5% |
| No change | 48.5% |
| 25 bps decrease | 0.7% |
| 50+ bps increase | 0.7% |
| 50+ bps decrease | 0.4% |
Data source: Polymarket.
The factors at play
- Dot plot signal: The median FOMC projection of 4.1% for end-2026 strongly suggests one more 25 bps hike this year (NYT).
- Goldman Sachs reversal: A major Wall Street bank now expects an October hike, adding weight to the hawkish case (Reuters).
- Inflation persistence: The Fed raised its 2026 PCE inflation forecast to 3.7%, and Warsh emphasized that inflation remains too high (CNBC).
- Warsh's data-dependent stance: The Chair refused to commit to a path, leaving room for a pause if economic conditions soften (NYT).
- Market pricing: CME FedWatch shows a near 50-50 split, consistent with Polymarket, indicating genuine uncertainty (Yahoo Finance).
- Energy prices and global factors: The path of oil prices and global economic weakness could influence the Fed's decision (BBC).
Our prediction
According to our analysis, the most likely outcome is 25 bps increase. Polymarket currently assigns a probability of 49.5%, while our internal estimate is 55%. The difference stems from these factors: the Fed's dot plot median explicitly points to one more hike in 2026; Goldman Sachs's influential reversal adds institutional weight; and Warsh's description of the September move as “removing accommodation” suggests the Fed sees further tightening as appropriate. However, the 48.5% chance of no change reflects Warsh's deliberate ambiguity and the risk that incoming data (especially employment and inflation) could justify a pause.
Risks and uncertainties
- Incoming economic data: If October CPI or employment reports show significant softening, the Fed could hold steady.
- Energy price shocks: A spike in oil prices could complicate the inflation outlook, potentially forcing a hike or a pause.
- Global economic weakness: A slowdown in Europe or China could reduce the urgency to tighten.
- Warsh's communication: Any shift in tone from the Chair between now and the meeting could move markets.
- Geopolitical events: Unexpected geopolitical crises could alter the economic landscape.
Conclusion
The Polymarket odds for the October FOMC meeting reflect a genuine coin-flip scenario. While the institutional signals (dot plot, Goldman Sachs) lean toward a 25 bps hike, the market's near-even split underscores the uncertainty. Traders should monitor upcoming data releases and Fed communication closely. The final decision will hinge on whether inflation and growth data between now and October 28 justify another move.
This content is for informational purposes only and does not constitute financial, political or investment advice, betting advice, or any operational recommendation.