Trump Raises U.S. Tariffs on South Korean Imports to 25% Over Trade Delay

President Donald Trump said he would raise U.S. tariffs on South Korean imports from 15% to 25%, targeting cars, lumber and pharmaceuticals and citing Seoul’s delay in ratifying a high-profile trade and investment deal agreed last year bbc +1. The announcement, made via a Truth Social post on Monday, immediately rattled South Korean markets and injected fresh uncertainty into one of Washington’s most important alliances bbc +1.

The move effectively reverses a 2025 framework under which the U.S. had cut its “reciprocal” tariff rate on Korean goods to 15% in exchange for a South Korean pledge to invest $350 billion in U.S. strategic sectors over time nytimes. South Korea’s government said it had not received any formal U.S. notification of the new tariffs and vowed to seek urgent talks, underscoring the ad hoc nature of Trump’s tariff diplomacy bbc +1.

A Trade Deal in Limbo Turns into Leverage

Trump framed the hike as punishment for South Korea’s National Assembly, which has yet to ratify the July 30, 2025 framework deal he hailed as a “Great Deal for both Countries” cnbc +1. Under that arrangement, the U.S. agreed to cap tariffs on Korean imports at 15% while Seoul committed to a $350 billion investment package, reportedly structured with annual cash outlays of up to about $20 billion nytimes.

The July deal followed months of broader “reciprocal tariffs” in which Washington set high baseline duties—often 25%—then bargained down bilaterally in exchange for concessions theguardian. South Korea submitted the framework to parliament only in late November, and its passage remained stalled when Trump announced the tariff snapback, claiming Seoul was “not living up” to the agreement bbc +1. Trade lawyers noted that the sudden increase sits uneasily alongside the existing U.S.-Korea Free Trade Agreement (KORUS), which is supposed to govern duties and dispute settlement between the two countries nbcnews.

Economic Jolt for an Export Powerhouse

South Korea exported a record $709.4 billion of goods in 2025, including $122.9 billion to the United States; autos alone accounted for about $30.2 billion, or roughly a quarter of its U.S.-bound shipments bbc. A 10‑percentage‑point jump in tariffs on such a central sector threatens margins for Hyundai, Kia and their suppliers and could push companies to reroute production or absorb losses.

Initial market reaction was sharp but volatile: the benchmark KOSPI index fell about 1.2% before rebounding to trade more than 1% higher, while the won weakened around 0.5% against the dollar bbc. Hyundai Motor shares dropped as much as 4.8% intraday before paring losses, and other major exporters also slid reuters. “It’s just another reminder that the markets were wrong to believe we were going to get into tariff stability in 2026,” said Josh Lipsky of the Atlantic Council bbc.

The Bigger Picture

The tariff surge added South Korea to a growing list of close U.S. partners jolted by Trump’s second-term trade strategy, which has relied on sudden tariff threats to force bilateral deals and domestic concessions theguardian. Seoul now faces a dilemma: accelerate a politically sensitive investment and trade package through parliament or brace for a protracted fight at the negotiating table, in KORUS dispute channels or at the World Trade Organization—routes that could take months or years and test the durability of a key security and economic alliance nbcnews.