TOKYO (Reuters) -U.S. President Donald Trump and Japanese Prime Minister Shigeru Ishiba on Wednesday said they had struck a trade deal that will include a 15% tariff on imports from Japan. Here's what we know so far.

THE DEAL

In a post on Truth Social, Trump said the deal would include $550 billion of Japanese investments in the United States, improved market access into Japan for American goods including automobiles, rice and other agricultural products.

The U.S. will also lower a punishing 25% tariff on Japanese automobiles to 15%, government and industry sources said. Trump made no comment on vehicle imports, which account for more than a quarter of all the country's exports to the U.S.

The White House has yet to provide details of the agreement, Ishiba said he will scrutinize the deal made by his tariff negotiator Ryosei Akazawa in Washington before releasing the contents.

TARIFF DEADLINE

Akazawa has traveled to the U.S. eight times since April for trade talks with U.S. officials including Treasury Secretary Scott Bessent and Commerce Secretary Howard Lutnick. The latest visit came days before an August 1 deadline when the Trump Administration said it would impose a 25% tariff on all Japanese imports.

The U.S. is Japan's biggest export market. Economists had estimated that Trump's tariffs could lower Japan's GDP by as much as a percentage point.

ELECTION FALLOUT

The tariff agreement comes three days after Ishiba's administration lost its upper house majority in an election, triggering calls for his resignation including from within his own ruling Liberal Democratic Party, according to local media reports.

In the wake of that election defeat, Ishiba said he would stay in place to push for a trade agreement with the U.S. and to tackle Japan's looming economic problems.

MARKET REACTION

Japanese automaker shares led the Nikkei share average higher, which rose by 2% in early trading following the announcement. Toyota Motor Corp's shares jumped by 10% with Honda Motor Co up by 9%.

The benchmark 10-year Japanese bond futures tumbled as much as 0.92 yen to 137.68 yen, the lowest since March 28.

(Reporting by Tim Kelly; Editing by Lincoln Feast.)