The growing list of major economies warning of weaker growth because of U.S. tariffs has a new member.

       The Bank of Japan said on Thursday that it expects the Japanese economy to grow 0.5 percent in the fiscal year that started on April 1. That is a sharp downgrade from the 1.1 percent the central bank had forecast in January.

       Explaining the change, Kazuo Ueda, the governor of the Bank of Japan, cited the imposition of an “unprecedented level” of tariffs by the United States. These trade barriers threaten both economic growth overseas and corporate profits in Japan, Mr. Ueda said in a briefing in Tokyo on Thursday.

       The Bank of Japan’s outlook was released alongside an announcement that Japan’s central bank would keep interest rates unchanged at 0.5 percent in an attempt to steady the economy.

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       President Trump’s tariff threats are weighing on economic prospects around the world. In April, the International Monetary Fund lowered its 2025 outlook for all Group of 7 nations, including Germany and Japan, the world’s third- and fourth-largest economies, due largely to U.S. tariffs.

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       In Japan, Mr. Trump’s new taxes on imports — including a 25 percent tariff on imported cars — are already weighing heavily on the economy. The country is also bracing for potentially higher across-the-board levies of 24 percent, which the prime minister has said would cause a national crisis if they were not negotiated lower.

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