Trump's 15% Tariffs Ignite Global Trade War Alarm

From Court Loss to Trade Escalation

In a dramatic sequence that has rattled global markets, President Donald Trump turned a significant legal defeat into a sweeping new trade offensive. On February 20, the US Supreme Court ruled 6–3 that Trump had exceeded his authority by using the International Emergency Economic Powers Act (IEEPA) to impose broad import tariffs — a tool the court found was reserved for genuine national emergencies, not trade policy.

Rather than retreat, Trump responded within hours. Invoking Section 122 of the Trade Act of 1974, he signed an executive order imposing a 10% universal tariff on all imports. By the following day, he raised that figure to 15% — effective immediately, exploiting a provision that allows a president to apply tariffs of up to 15% to address "large and serious" balance-of-payments problems for up to 150 days.

What the Tariffs Cover

The new 15% levy applies to approximately $1.2 trillion worth of annual imports, or roughly 34% of everything the United States buys from abroad, according to the Tax Foundation. Goods covered under the US–Mexico–Canada Agreement (USMCA) are exempt, as are pharmaceuticals, critical minerals, and select food imports such as beef, tomatoes, and oranges.

The 150-day clock means the tariffs are set to expire in late July 2026 — unless Congress votes to extend them, a politically contentious prospect that trade experts say remains uncertain.

A Historic Tax Burden on American Households

The economic consequences are landing squarely on American consumers. The Tax Foundation estimates the combined tariff slate — including earlier Section 232 levies that survived the Supreme Court — amounts to the largest US tax increase as a share of GDP since 1993. Average households could face an additional burden of between $700 and $1,500 in 2026 alone.

Critically, economists note the tariffs have "not meaningfully altered the trade deficit" — their stated purpose — while still driving up prices on electronics, clothing, and everyday goods.

Europe Braces for a Trade War

The EU's reaction was swift and furious. A bloc assessment concluded that the new 15% tariff pushes levies on some European exports — including cheese and agricultural products — above levels permitted under the existing US–EU trade agreement, effectively constituting a breach of treaty obligations.

The European Parliament halted ratification of a sweeping transatlantic trade deal, with lawmakers citing deep uncertainty about Washington's commitments. "Nobody knows what will happen," one senior lawmaker told CNBC.

The EU has also signalled it is ready to deploy its Anti-Coercion Instrument — a powerful retaliatory tool that could block US goods, bar American firms from EU public tenders, and restrict foreign direct investment, potentially inflicting billions in losses on US companies.

The UK, Canada, and India have also registered alarm, with NBC News reporting "a familiar uncertainty as the world grapples with fresh Trump tariff turmoil."

A New Legal and Political Battlefield

The Section 122 gambit is legally narrower than IEEPA — it caps tariffs at 15% and has a built-in expiration — but it sets the stage for a prolonged congressional and judicial fight. Trade lawyers warn that future administrations may struggle to unwind the economic and diplomatic damage, particularly if retaliatory measures harden on both sides of the Atlantic.

For now, one economic verdict stands out: the US is erecting the highest trade barriers it has seen in decades, and the rest of the world is beginning to build walls in return.