How these deals work and why they happened
If you want fewer tariff headaches, you pay up. Last year, Trump set a 15% ceiling on tariffs for Japan and South Korea, and in return they promised a combined $900 billion of investment in the US. In the first half of 2026, the US ran a $20 billion goods deficit with Japan and a wider $50 billion shortfall with South Korea, keeping trade front and center.
Security reliance on Washington means Tokyo and Seoul have limited room to push back, and both are already moving. For Japan's package, a panel chaired by US Commerce Secretary Howard Lutnick puts forward projects; Trump selects from that slate, and a different Japanese committee can refuse financing if commercial or risk criteria aren't met.
Japan's investments must be in place by Jan. 19, 2029. Profit sharing flips heavily to Washington once the principal plus accrued interest are fully repaid, at a 90:10 split. A memorandum signed last year states that, should Tokyo fail to fund Trump‑approved projects within 45 days, the US may increase tariffs. According to the US government, tariffs will remain unchanged so long as Japan fulfills the deal.
What Japan and South Korea have actually put on the table
Japan committed as much as $550 billion in government-backed backing for US projects, including investments, loans, and guarantees. Government-linked Japan Bank for International Cooperation and Nippon Export and Investment Insurance are set to be central, with private companies likely to participate. Last year, Trade Minister Ryosei Akazawa noted that just a small slice of the $550 billion would take the form of pure equity.
Two tranches are already outlined. The initial tranche plans $36 billion for US oil, gas, and minerals initiatives, among them a natural gas site in Ohio. The second allocates $73 billion to a nuclear initiative spanning Tennessee and Alabama, plus to natural-gas-fired plants in Pennsylvania and Texas. After meeting Lutnick and US Trade Representative Jamieson Greer in Washington in September, Akazawa said the two sides confirmed that Japan would face no tariffs beyond those set in last year's agreement.
South Korea's pact, finalized in October 2025, pledges $350 billion with an annual cap of $20 billion. The Bank of Korea said that moving at that pace would not upset currency stability. Under the deal, if Seoul hasn't recovered its principal within 20 years, the profit-sharing terms can be revised, and projects may move forward only when they are commercially viable with guaranteed cash flow.
In March, Parliament approved the enabling bill, following Trump's January warning that tariffs could reach 25% if delays continued. On Sept. 30, Trump announced that South Korea planned $200 billion of US energy investments, including nuclear plants, a Texas gas-fired power project, and an Alaska natural-gas export project.
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The marquee projects and where they stand
Under Seoul's Project Power, as much as $120 billion is slated for eight nuclear reactors, comprising two Korean-designed APR1400 units and six Westinghouse Electric Co. AP1000 reactors. The effort is expected to involve both governments, Westinghouse, Korea Electric Power Corp. and Korea Hydro & Nuclear Power Co., and both sides agreed to consider whether Korean companies could acquire a stake in Westinghouse.
A further $22 billion is allocated to Project Star, which is a 6.5-gigawatt gas-fired plant in Encinal, Texas, slated to begin powering nearby data centers in 2029. Officials in Seoul have yet to verify the $54 billion amount and have disputed claims that the agreement is finalized. Industry Minister Kim Jung-kwan said the Alaska project would move ahead solely if the economics work, and said the government had conveyed regret to Lutnick about reports that went beyond what both sides had agreed to.
South Korea has also pledged $150 billion to a cooperation project called Make American Shipbuilding Great Again, or MASGA, to help restore the competitiveness of US shipbuilding.
The tradeoffs and why this could hit closer to home than you think
Japan's commitment is big: about 15% of annual GDP as of the end of 2025, with the potential draw just under half of its foreign-exchange reserves. That comes as Prime Minister Sanae Takaichi, in office since October 2025, is trying to juice domestic investment. Economists say sending more capital stateside could encourage companies to expand in the US rather than at home, softening Japan's industrial pulse.
For South Korea, the load is heavier relative to size: roughly 20% of 2024 GDP and about 80% of foreign-exchange reserves. Analysts like the $20 billion annual cap and the safeguards, but they are still watching how a $350 billion pledge might ripple through sovereign ratings, capital flows and competing national priorities.
For your wallet, here is the upshot: real projects with clear timelines, cash flow checks and profit terms are lining up, with milestones that run through Jan. 19, 2029. That can influence where new energy, infrastructure and industrial capacity land in the US, and how steadily those dollars arrive over the next few years.
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