Trump's 10% Tariff in 2026: Impact on Korean Exports

The U.S. Supreme Court has ruled Donald Trump's "reciprocal tariffs" unconstitutional. While the market briefly breathed a sigh of relief, former President Trump immediately countered with a plan to impose a 10% universal tariff on all imports. This move, aiming to overcome legal constraints with political will, casts immense uncertainty over the global trade environment ahead of the 2026 U.S. presidential election. This is not merely a policy confrontation but could be the prelude to "Global Trade War 2.0," potentially shaking the foundations of the world trade order.

Supreme Court Ruling: Not an End, But a New Beginning for Trade Policy

On February 21, 2026, the U.S. Supreme Court ruled that reciprocal tariffs, a policy pursued by the Trump administration, were unconstitutional. Reciprocal tariffs are defined as a system where the U.S. imposes tariffs on products from a specific country at the same rate that country levies tariffs on U.S. goods. The Supreme Court viewed such unilateral tariff imposition by the executive branch as an infringement on congressional authority.

However, this ruling does not signal the end of protectionism. Immediately after the verdict, former President Trump announced his intention to utilize existing U.S. trade laws to impose a 10% universal tariff on all imports. This attempt aims to circumvent the specific "reciprocal tariffs" method challenged by the Supreme Court, establishing a broader and more potent trade barrier.

This strategy—transforming a legal defeat into justification for a new policy—is designed to rally his core supporters in the upcoming election while maximizing unpredictability for the global market. It signals that legal principles can be rendered powerless in the face of political might.

The 10% Universal Tariff: What Makes It Different?

The Trump administration's past tariffs were "targeted," aimed at specific items and countries, such as products from China or steel and aluminum. This approach allowed for the possibility of tariff adjustments or exemptions through negotiations. However, the "10% universal tariff" now proposed is fundamentally different.

As its name suggests, this tariff imposes a uniform 10% tax on all goods entering the U.S., regardless of their country of origin or specific product category. This indiscriminate measure, which makes no distinction between allies and adversaries, could simultaneously shock global supply chains.

Such a policy would not merely raise import prices; it would compel structural changes, including the relocation of global companies' production bases and the reorganization of supply chains. For export-oriented countries heavily reliant on the U.S. market, this would undoubtedly pose a critical threat.

Three Scenarios for the South Korean Economy

If former President Trump's plan materializes, what path might the South Korean economy take? We can outline three scenarios.

First, the most optimistic scenario. This involves South Korea securing exemptions for key export items like automobiles and semiconductors through diplomatic efforts, similar to how the current White House has mentioned potential temporary tariff exceptions for the auto industry. In this case, short-term shocks would be minimized, but the political uncertainty that tariff exemptions could be revoked at any time would persist.

Second, the baseline scenario. This assumes the 10% universal tariff is applied as proposed. For example, a South Korean car exported at $50,000 would see its import cost in the U.S. rise to $55,000. This increased cost would be passed directly to consumers, eroding price competitiveness. A decline in exports and worsening corporate performance would be unavoidable across major industries such as automobiles, home appliances, and steel.

Third, the worst-case scenario is a "full-scale trade war" where the U.S.'s universal tariff triggers retaliatory tariffs from major trading partners like the EU and China. If countries competitively raise trade barriers, global trade volumes would plummet, and supply chains would be paralyzed. This would cause raw material prices to surge and lead to stagflation (inflation amid economic stagnation), potentially recreating the nightmare of protectionism that triggered the Great Depression in the 1930s.

How Businesses and Government Should Prepare

What should we do in the face of such immense uncertainty? The Blue House has already convened a meeting of relevant ministers to discuss countermeasures, but this is just the beginning.

For businesses, diversifying export markets is the most urgent task. It is crucial to reduce excessive reliance on the U.S. market and actively explore new growth markets like ASEAN and India. Furthermore, strategies for "localization of production"—relocating production bases to the U.S. or neighboring countries to circumvent tariff barriers—must be thoroughly considered.

The government must mobilize all diplomatic channels to minimize harm to South Korean companies. Alongside short-term responses like securing tariff exemptions for specific items, a long-term strategy is needed to cooperate with the international community within multilateral trade systems like the WTO to jointly counter the spread of protectionism.

Investors, too, must recognize "Trump risk" as a constant. As some experts predict a rise in the value of safe-haven assets like gold, market volatility will inevitably increase. This is a time to diversify portfolios concentrated in specific countries or industries and to carefully monitor macroeconomic trends. The coming wave cannot be avoided, but preparing in advance can mitigate its impact.