By Lucia Mutikani

WASHINGTON (Reuters) – U.S. consumer spending rose less than expected in January as the largest monthly increase in inflation in four years eroded households’ purchasing power, pointing to moderate economic growth in the first quarter.

The surge in inflation raises the possibility of an interest rate increase from the Federal Reserve this month. While still below the U.S. central bank’s 2 percent target, inflation is now in the upper end of the range that Fed officials in December felt would be reached this year.

The Commerce Department said on Wednesday that consumer spending, which accounts for more than two-thirds of U.S. economic activity, increased 0.2 percent after rising 0.5 percent in December. Economists polled by Reuters had forecast consumer spending gaining 0.3 percent in January.

Consumer spending is likely to remain supported amid promises by the Trump administration of sweeping tax cuts and increased infrastructure spending.

In a speech to Congress on Tuesday night, President Donald Trump said his economic team was working on a “historic tax reform that will reduce the tax rate on our companies” and promised a “massive” tax relief for the middle class. Trump offered no further details.

Consumer confidence has surged following Trump’s election victory, hitting a 15-1/2-year high in February.

In January the personal consumption expenditures (PCE) price index increased 0.4 percent – the largest gain since February 2013 – after rising 0.2 percent in December.

In the 12 months through January, the PCE price index jumped 1.9 percent. That was the biggest year-on-year gain since October 2012 and followed a 1.6 percent increase in December.

Excluding food and energy, the so-called core PCE price index rose 0.3 percent in January. That was the biggest increase since January 2012 and followed a 0.1 percent gain in December.

The core PCE price index increased 1.7 percent year-on-year after a similar gain in December. The core PCE is the Fed’s preferred inflation measure.

Prices for U.S. Treasuries fell, with the yield on the interest-rate sensitive 2-year note <US2YT=RR> rising to its highest level since August 2009. Fed funds futures were pricing in a 65 percent chance of an interest rate hike at the Fed’s March 14-15 policy meeting.

The U.S. central bank has forecast three rate increases this year. The Fed hiked its overnight interest rate last December by 25 basis points to a range of 0.50 percent to 0.75 percent.

The dollar rose against a basket of currencies, while U.S. stock index futures pared gains slightly.

REAL SPENDING FALLS

Rising price pressures, however, suggest that consumer spending will probably not provide a big boost to gross domestic product in the first quarter. When adjusted for inflation, consumer spending fell 0.3 percent in January, the first drop since August and the biggest in three years. Real consumer spending increased 0.3 percent in December.

Consumer spending increased at a 3.0 percent annualized rate in the fourth quarter, helping to blunt some of the impact on the economy from a wider trade deficit. The economy grew at a 1.9 percent rate in the fourth quarter.

Consumer spending in January was held back by a 0.3 percent drop in purchases of long-lasting manufactured goods such as automobiles. Spending on services was unchanged.

Personal income rose 0.4 percent in January after gaining 0.3 percent in December. Wages and salaries rose 0.4 percent.

Income at the disposal of households after accounting for inflation and taxes, fell 0.2 percent, the first decline since October 2013. Savings increased to $795.7 billion in January from $779.5 billion in December

(Reporting by Lucia Mutikani; Editing by Andrea Ricci)