How The Fed Sets Interest Rates - And What The October Hold Means For December

With a 75% chance of a year-end hike, investors are focused on upcoming inflation data and the next FOMC dot plot.

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On October 28, the Federal Reserve held its benchmark rate at 3.75% to 4.00%. The vote was 10–2, with Governors Cook and Hammack dissenting in favor of another hike. December 8–9 is now the live meeting: markets price roughly a 70–75% chance of a quarter-point hike, and the Fed will publish a fresh dot plot alongside the decision.

To understand what happens next, it helps to understand the machinery. The Fed does not simply announce a number. It steers a market, through a committee, toward two legally mandated goals — and every data release between now and December is effectively a pre-meeting for that decision.

The federal funds rate: the Fed's main lever

The federal funds rate is the rate at which banks lend reserves to each other overnight. Strictly speaking, the Fed does not set it directly. It sets a target range — currently 3.75% to 4.00% — and uses tools to keep the actual market rate inside it. As of October 22, the effective federal funds rate stood at 3.88%.

Two tools do the steering:

- Interest on Reserve Balances (IORB): Banks earn interest on the reserves they park at the Fed. This acts as a floor — no bank will lend to another overnight for less than it can earn risk-free at the Fed.

- The Overnight Reverse Repo Facility (ON RRP): A broader set of counterparties, including money market funds, can lend to the Fed overnight against Treasury collateral, setting a soft floor underneath money-market rates.

Because so many borrowing costs across the economy are priced off short-term benchmarks, the federal funds rate becomes the anchor for everything else. Credit cards, which usually carry variable rates tied to prime, typically reflect a 25-basis-point move within a billing cycle or two. Thirty-year mortgage rates track the 10-year Treasury yield more closely, so they respond through expectations about the future path of rates rather than the overnight rate itself. The 10-year yield closed at 4.94% on October 30 — a reminder that the bond market, not the Fed alone, sets the cost of a mortgage.

The FOMC: the twelve people who decide

Rate decisions are made by the Federal Open Market Committee, a twelve-member panel: the seven members of the Board of Governors (including the Chair), the president of the New York Fed, and four of the eleven regional Reserve Bank presidents, rotating in one-year turns.

The Committee holds eight regularly scheduled meetings a year. The decision statement is released at 2:00 p.m. ET on the Wednesday, followed by the Chair's press conference at 2:30 p.m. ET. The minutes arrive three weeks later.

Watch the communication, not just the votes. Fed officials stop speaking publicly about policy from the second Saturday before each meeting — the blackout period — so the week before a decision is deliberately quiet, and the weeks before it are where the real signaling happens. The October dissent is a case in point: two governors publicly favoring a hike tells you the committee's center of gravity even when the majority holds.

The dual mandate: what the Fed is aiming at

By law, the Fed pursues two goals: price stability and maximum employment. Price stability means inflation averaging 2% over time, measured by the PCE price index — not the CPI. PCE inflation runs about 0.4 to 0.5 percentage points below CPI on average, and the Fed prefers it because it covers a broader basket of spending and handles substitution between goods better.

The September data illustrated the mechanism. CPI, released October 14, came in at 3.7% year over year headline and 2.6% core — hotter than expected, and it immediately revived talk of a December hike. The September PCE print — the measure the Fed actually targets — followed on October 29 at 3.6% headline and 3.1% core. Both are still well above the 2% goal, which is why the tightening conversation has not gone away even after the October hold.

The two halves of the mandate can pull in opposite directions. Strong hiring with hot inflation is exactly the tension the Fed faced through 2026, and it is why every major data release — CPI around the 10th–14th of each month, PCE late in the following month, the jobs report on the first Friday — is effectively a pre-meeting for the next FOMC.

The dot plot: reading the Fed's own forecast

Four times a year, at the March, June, September, and December meetings, the Fed publishes the Summary of Economic Projections, and its most famous page is the dot plot: each FOMC participant anonymously marks where they think the federal funds rate should be at year-end for the next several years and over the longer run.

How to read it: the median is what markets treat as the "official" forecast — the middle dot, not an average. The dispersion matters as much as the median: dots spread wide mean genuine disagreement, which usually makes policy harder to predict. The longer-run dot is the committee's estimate of the neutral rate. At the September meeting, the projections showed most officials expecting one more quarter-point hike before year-end — the signal that underpins the market's current December pricing. The next dot plot lands with the December 8–9 decision, and it will be the most important page the Fed publishes this year.

How markets price the next move

Markets do not wait for the FOMC statement; they trade probabilities on it continuously. Fed funds futures let traders bet on where the rate will be at each meeting, and the CME's FedWatch tool converts those prices into hike-or-hold probabilities. Prediction markets offer an alternative read on the same question. A Reuters poll of economists conducted October 16–20 told the same story: 94 of 100 expected a hold in October, while all 100 expected a hike in December — a sharp shift from the previous month's poll, when fewer than half saw a December move.

What to watch into December

Three things decide December: the November CPI and jobs data, the tone of Fed speeches before the blackout, and the December dot plot itself. The September hike was the first increase since July 2023, ending a long pause, and officials have been explicit that a skip is not a stop — even hawkish governors argue hikes "do not need to come at consecutive meetings." A hold that ends the cycle is only identifiable in hindsight, when the next move turns out to be a cut.

The October hold bought the Fed time. December is when it has to spend it.

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