Boosts in revenue from taxes and tariffs narrowed the U.S. budget deficit in the October to December period from the year before, Department of Treasury data showed on Tuesday.

The deficit shrank by 15% from the prior fiscal year, from $711 billion to $602 billion.

Overall revenue climbed by 13% to $1.2 trillion, while spending rose by 2% overall to $1.8 trillion.

Both the revenues and outlays were records, a senior Treasury official told reporters.

Among categories, some taxes collected from individuals increased notably while customs duties surged from $23 billion a year ago to $94 billion in the first three months of the current fiscal year.

The leap in duties collections was primarily due to higher tariffs, the official said.

Since returning to the White House last January, President Donald Trump has rolled out wide-ranging duties impacting virtually every U.S. trading partner.

Besides touting the duties as leverage in trade talks with other countries, Trump has also pointed to tariff incomes as a way to reduce the government's deficits.

In August, the U.S. leader pointed to a Congressional Budget Office projection that changes in tariffs would reduce total deficits by $4.0 trillion altogether over a decade.

But critics warn that whether the revenues are fully realized depends on how the economy reacts to higher duties.

Many of Trump's sweeping tariffs also face legal challenges, with the Supreme Court due to rule on their legality after hearing arguments late last year. The ruling does not impact sector-specific duties, but could affect country-specific ones.

Among the government's outlays, spending by the Treasury jumped by $48 billion, driven by interest on the public debt and largely due to the higher amount of outstanding debt overall.

Spending by the Health and Human Services -- relating to Medicare and Medicaid -- picked up by $34 billion.

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