By Min Zeng 

An inflation gauge closely watched by Federal Reserve officials has fallen to the lowest level since the financial crisis, potentially complicating the interest-rate outlook as investors brace for a likely Fed rate increase as soon as mid-2015.

The five-year forward five-year inflation breakeven rate hit 2.0185% this month, the lowest since Dec. 31, 2008, according to the latest data provided by Rabobank.

The gauge measures what the average inflation rate will be during a five-year period starting from five years from today, in this case between 2019 and 2024.

Inflation expectations are tumbling amid uncertainty over the economic outlook in China, Europe and Japan. While investors generally prefer lower inflation because it helps preserve the value of their assets, officials around the globe are wary of deflation, a damaging cycle of falling prices and reduced spending that can hamstring economic growth.

The falling inflation expectations help to explain the sharp decline this year in benchmark Treasury yields. The 10-year U.S. note on Tuesday yielded 2.22%, down from 3% at the end of 2013 and far below the forecasts that many Wall Street strategists started the year with. Many investors and analysts continue to expect yields to rise this year as U.S. growth picks up, though falling inflation readings have softened many of the most aggressive forecasts.

Adding to the swirl, a broad selloff in the energy markets since the summer has further reduced inflation readings. Many economists expect lower oil prices to boost growth in the U.S. and elsewhere, but the timing of the gains is unclear.

To be sure, few expect the U.S. will slip into deflation. But market analysts say falling inflation readings could further slow Fed plans to raise the fed funds rate, which has been near zero since the crisis.

"With inflation benign, the Fed has breathing room and the luxury of remaining patient," said Sean Simko, head of fixed-income management at SEI Investments in Oaks, Pa., which has $146 billion in assets under management.

Some other market-based inflation expectation gauges in the U.S. government bond market have fallen below the Fed's 2% target. The five-to-10-year inflation outlook from the monthly University of Michigan/Thomson Reuters consumer sentiment survey last month fell to 2.6%, the lowest level since 2009.

"With Japan and Europe still actively trying to generate inflation, the Fed will not want to stall their own progress on the same," said William O'Donnell, head of U.S. government bond strategy at RBS Securities Inc.

While Fed officials have taken note of low inflation expectations, Fed Vice Chairman Stanley Fischer and New York Fed President William Dudley highlighted last week the benefits of lower energy prices to the U.S. growth outlook. Cheaper energy costs allow U.S. consumers to spend more money on other items.

Mr. Fischer said lower inflation driven by lower oil "is going to be temporary." Mr. Dudley said that inflation will begin to move up towards the Fed's 2% objective next year. The views suggested the central bank is prepared to raise interest rates in 2015, said analysts.

Interest rate futures markets show many investors expect the Fed to start raising interest rates during the second half of next year. Economists at Goldman Sachs Group Inc. expect the Fed to raise rates in September 2015.

But Mr. O'Donnell said the Fed could push out the timing of an interest-rate increase to 2016 if inflation remains below 2%.

Write to Min Zeng at min.zeng@wsj.com

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