In a sudden and potentially damaging move, US President Donald Trump has announced plans to increase tariffs on South Korean imports, particularly targeting automobiles, lumber, and pharmaceuticals. This decision, which could raise tariffs from 15% to 25%, comes amid accusations that South Korea has failed to uphold commitments made under a recent trade agreement. Following the announcement, shares in South Korean car manufacturers plummeted, reflecting the immediate market concerns and uncertainty surrounding the future of US-South Korea trade relations.
Tariff Increase Announced
In a statement shared via social media, Trump expressed his frustration with the South Korean government, claiming that their legislature has not fulfilled its obligations under what he described as a “Historic Trade Agreement.” He emphasised that the increase in tariffs would be enacted due to a lack of legislative action from Seoul, stating, “South Korea’s Legislature is not living up to its Deal with the United States.” However, the US administration has yet to issue formal documentation regarding these tariff changes, leaving many in the business community on edge.
South Korea’s Response
In response to Trump’s announcement, South Korea’s presidential office indicated that they were taken aback by the lack of prior communication regarding the impending tariff hikes. South Korea’s Trade Minister, Kim Jung-kwan, who is currently in Canada, is set to travel to Washington for discussions with US Commerce Secretary Howard Lutnick to address these developments. The South Korean government has maintained that the agreement reached last year does not require parliamentary approval, describing it as a memorandum of understanding rather than a legally binding contract.
The original trade agreement, finalised following a meeting between Trump and South Korean President Lee Jae Myung in October 2025, was intended to foster closer economic ties, including tariff reductions on key products. Yet, it appears that the terms of the agreement have yet to be fully implemented, creating a legal quagmire that has raised questions about its efficacy and durability.
Market Reactions and Economic Implications
The auto sector is particularly vulnerable to these tariff changes, as it constitutes approximately 27% of South Korea’s exports to the US. Nearly half of South Korea’s total car exports are directed to the American market, making the implications of increased tariffs significant. Following Trump’s announcement, shares of major South Korean car manufacturers experienced a sharp decline, with some falling by as much as 5% in just minutes.
Trump’s approach to tariffs has been a hallmark of his economic policy, often wielded as a tool for foreign negotiations. His recent threats extend beyond South Korea; he has issued warnings to Canada about imposing a 100% tariff on goods should they pursue a trade agreement with China. Moreover, earlier in January, he hinted at potential tariffs on several European nations until his Greenland acquisition aspirations are realised.
Expert Analysis
Josh Lipsky, chair of international economics at the Atlantic Council, notes that Trump’s recent actions reflect a growing impatience with the pace of South Korean legislative processes concerning the trade agreement. “This is just another reminder that the markets were wrong to believe we were entering a period of tariff stability in 2026,” he stated. “The volatility alone carries a significant cost.”
Why it Matters
The potential increase in tariffs on South Korean goods signifies not only a shift in US trade policy but also poses a significant threat to the already fragile economic relationship between the two nations. For South Korea, a country heavily reliant on exports, particularly in the automotive sector, the implications could be severe, impacting jobs and economic growth. As global trade dynamics continue to shift, this situation serves as a critical reminder of the fragile nature of international agreements and the broader consequences of protectionist policies.