US October CPI rises 0.4% — why a 0.3% core reading put a half-point Fed hike on the table

A tenth of a percentage point changed the debate over how far the Fed will go. The Bureau of Labor Statistics reported on Tuesday, November 10, 2026, that the consumer price index rose 0.4% in October from September. Economists had expected 0.3%. Core prices, excluding food and energy, rose 0.3% against a 0.2% forecast. Headline inflation actually slowed from 0.6% in September. Even so, markets began pricing a real chance that the Federal Open Market Committee raises rates by half a point rather than a quarter point on December 9.

The reason was set up a few hours before the release. Fed Governor Christopher Waller told a London audience that a 50-basis-point hike should be considered if core inflation came in around 0.3% or higher. The number landed exactly on that line. The report also had an unusual hole in it: there is no year-over-year inflation rate at all.

1. How 0.4% became a half-point conversation

Waller spoke at the Bank of England Watchers Conference in London on November 10, before the CPI release. Press accounts of the speech describe three steps.

Waller voted to hold rates on October 28. The two dissenters at that meeting, Governor Lisa Cook and Cleveland Fed President Beth Hammack, both wanted a hike. A governor from the majority saying two weeks later that a quarter point might not be enough carried extra weight.

Core CPI then printed 0.3%, the same as in August and September. A 0.3% monthly pace compounds to roughly 3.7% a year. Mark Zandi of Moody's told CNBC that a monthly reading near 0.2% would be more consistent with the Fed's 2% target. The gap between 0.2% and 0.3% is the gap between near target and nearly double it.

The snapshots differ, but the direction is the same: the chance of a hold disappeared, and the question moved from whether to how much. The policy rate stands at 3.75% to 4.00% after a quarter-point hike on September 16 and a hold on October 28. A quarter point would take it to 4.00%–4.25%; a half point to 4.25%–4.50%.

2. Gasoline cooled, and prices still beat forecasts

What made the report uncomfortable was its composition. Gasoline drove September. In October that pressure faded sharply, and the total still came in above forecast.

Energy went from 5.2% to 0.7%, yet the headline only eased from 0.6% to 0.4%, because food and services filled the gap. Food was flat in September and rose 0.5% in October, led by meat and dairy according to Yahoo Finance. Gregory Daco of EY-Parthenon said pressures were broad across food, goods and services and that the report likely seals a December hike. Sam Williamson of First American said the disinflationary help from shelter appears to be fading. When one item is responsible, a central bank can wait; when increases are broad, the case for waiting weakens.

Bond markets priced the larger move. Yahoo Finance reported the 5-year Treasury yield up 10 basis points at 4.75%, the 10-year up 7 at 4.93% and the 30-year up 3 at 5.29%. Shorter maturities moved most, a sign that investors were repricing the next Fed decision rather than long-run inflation. Stocks slipped: on November 10 the S&P 500 closed down 0.38% at 7,521.11, the Dow down 0.30% at 52,233.32 and the Nasdaq Composite down 0.74% at 25,065.88. Part of the Nasdaq decline reflected a drop of more than 5% in Nvidia, so it cannot be attributed to inflation alone.

3. Why there is no annual rate, and what is still open

The number that normally leads a CPI story is the 12-month change. This time it does not exist. The BLS release states that it did not collect survey data for October 2025 because of a lapse in appropriations and therefore cannot publish 12-month changes for October 2026 where that base is missing. The federal shutdown of October 1 to November 12, 2025, has come back a year later as a gap in the statistics.

Private estimates fill the space. Bank of America projected 3.8% before the release, according to CNBC; Heather Long of Navy Federal Credit Union put it at around 4%; HousingWire cited economists pointing to the high 3% range. None of these is official. With the familiar annual yardstick gone, a 0.1-point miss on the monthly figure carried more weight than usual, and Waller framing his threshold in monthly core terms made it bite directly.

For readers in South Korea, where this publication is based, the direct link is the rate gap. The Bank of Korea holds its base rate at 3.00% and meets next on November 26. If it stands pat, the gap to the top of the Fed range, now 1.00 percentage point, would widen to 1.25 points after a quarter-point US hike and 1.50 points after a half point, a setup that tends to weigh on the won. How the won actually traded after the report was not confirmed at the time of writing. Our earlier coverage of the October 28 FOMC hold with two hawkish dissents, an explainer on what the US CPI measures, and a guide to how rate-hike probabilities are derived from futures prices give the background.