By Lucia Mutikani

WASHINGTON, Feb 13 (Reuters) – U.S. consumer prices increased less than expected in January, but underlying inflation firmed as businesses raised prices at the start of the ‌year, which together with a stabilizing labor market could allow the Federal Reserve to ‌keep interest rates unchanged for a while.

The Consumer Price Index rose 0.2% last month after an unrevised 0.3% gain in ​December, the Labor Department’s Bureau of Labor Statistics said on Friday. Economists polled by Reuters had forecast the CPI increasing 0.3%.

With January’s CPI report, the BLS published recalculated seasonal adjustment factors to reflect 2025 price movements.

The report was slightly delayed by last week’s three-day shutdown of the federal government. A longer ‌shutdown last year prevented the collection ⁠of prices for October, causing volatility in the CPI data. Economists expected the volatility faded in January’s report.

In the 12 months through January, the CPI increased ⁠2.4%. The slowdown in the year-on-year inflation rate from 2.7% in December mostly reflected last year’s higher readings dropping out of the calculation.

The U.S. central bank tracks the Personal Consumption Expenditures Price Indexes for its ​2% ​inflation target. Both measures are running well above target. ​The government reported this week that job ‌growth accelerated in January and the unemployment rate fell to 4.3% from 4.4% in December.

The Fed last month left its benchmark overnight interest rate in the 3.50%-3.75% range.

Excluding the volatile food and energy components, the CPI increased 0.3% after rising by an unrevised 0.2% in December.

Core CPI numbers have overshot expectations every January, with economists saying the seasonal adjustment factors, the model used by the ‌BLS to strip out seasonal fluctuations from the data, were ​not fully accounting for the one-off turn-of-the-year price increases.

Last ​month’s increase likely reflected the one-off turn-of-the-year price ​hikes as well as the tariff pass-through from President Donald Trump’s broad tariffs. ‌In the 12 months through January, the ​so-called core CPI increased 2.5% ​after advancing 2.6% in December. That also reflected last year’s higher readings dropping out of the calculation.

Economists expect inflation to pick up for a while this year, citing the ​pass through from import duties as ‌well as the dollar’s depreciation last year against the currencies of the United States’ ​main trade partners. The trade-weighted U.S. dollar fell about 7.4% last year.

(Reporting by Lucia ​Mutikani; Editing by Andrea Ricci and Chizu Nomiyama)