Japan's $550 billion investment package agreed in this week's U.S. tariff deal could help finance a Taiwanese firm building semiconductor plants in the U.S., Japan's top trade negotiator Ryosei Akazawa said on Saturday.

White House Press Secretary Karoline Leavitt said, "Japan will now pay a 15% tariff versus the reciprocal rate of 24% that they initially had."

The deal imposes 15% tariffs on Japanese cars and other goods, one of the more favorable rates. While the start date and other basic elements are still unknown, Treasury Secretary Scott Bessent warned this week that the US would monitor implementation and bump the rate up to 25% if Trump isn’t satisfied.