The Ministry of Trade and Industry and the Monetary Authority of Singapore attributed the decline to lower food and services prices.
The core CPI excludes private transport and accommodation costs to better reflect household expenses.
The all-items inflation in Singapore slowed to 2.7 percent year-on-year in March from 3.4 percent in February.
Singapore expects its headline and core inflation to range between 2.5 percent and 3.5 percent this year.
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