• The Dallas Fed’s trimmed-mean PCE price index rose at a 2.8% annualized pace in September, up from 2.0% in August, signaling a potential reacceleration in underlying inflation.
  • Headline PCE inflation accelerated to 3.6% year over year, while core PCE climbed to 3.1%, adding to concerns that price pressures are broadening.
  • The data, released as the Federal Reserve holds rates steady, may complicate the case for near-term rate cuts and keep borrowing costs elevated.

Underlying Inflation Picks Up

The Federal Reserve Bank of Dallas reported Thursday that its trimmed-mean PCE price index—a gauge designed to filter out volatile price swings—accelerated to a 2.8% annualized rate in September, compared with 2.0% in August. The reading suggests that underlying inflation, which had appeared to be cooling, may be regaining momentum. However, a single month’s data does not necessarily establish a trend, and analysts caution that revisions could alter the picture.

The trimmed-mean measure, which excludes the most extreme price changes across spending categories rather than simply stripping out food and energy, is closely watched by economists as a cleaner signal of inflation’s direction.

Broader Price Pressures Build

The September report also showed headline PCE inflation rising 0.5% on the month and 3.6% year over year, while core PCE—excluding food and energy—increased 0.3% month over month and 3.1% annually, up from 3.0% in August. The combination of stronger growth and persistent inflation was underscored by separate data showing third-quarter GDP expanded at a 3.4% annualized rate, above expectations.

The mixed signals come as the Federal Reserve, which held its benchmark rate steady at 3.75%–4.00% on Wednesday, weighs the risk of renewed inflation against the need to support economic activity. The September figures give policymakers another reason to be cautious about declaring inflation defeated, potentially delaying any pivot toward easing.

“The trimmed-mean measure strips out noise, but the rise to 2.8% is a reminder that the inflation fight is not over,” said one economist familiar with the data, who requested anonymity to speak candidly. “The Fed will want to see more than one month before drawing conclusions.”

Market Implications and the Road Ahead

A sustained increase in underlying inflation would weaken the case for rate cuts and could put upward pressure on bond yields, while persistently restrictive rates would keep financing conditions challenging for housing and other interest-sensitive sectors. Still, the quarter as a whole showed slower inflation—annualized headline and core PCE rose 2.1% and 2.5% in the third quarter, down from 5.0% and 3.3% in the second quarter—suggesting the September uptick may be a blip rather than a turning point.

The Dallas Fed’s research has previously highlighted that tariffs and energy costs, particularly from Middle East disruptions, can distort inflation readings. The central bank is expected to scrutinize upcoming months for signs of persistence. The next key data point will be the fully updated September trimmed-mean table, including any August revisions, due later this week.

Update: This article was corrected to clarify that the trimmed-mean PCE is an annualized monthly rate, not a year-over-year figure. A previous version misstated the August comparison.