The UK government is on high alert following a landmark decision by the US Supreme Court that overturned former President Donald Trump’s global tariff policies. As both Britain and the EU assess the fallout, officials are cautiously optimistic about the potential for trade relations to remain stable, while also scrutinising the implications for businesses on both sides of the Atlantic.
UK Government Responds
In a statement, a Downing Street spokesperson confirmed that the UK is collaborating with US authorities to evaluate the impact of the ruling, which deemed Trump’s imposition of global tariffs as unlawful. While the government expects its current advantageous trading position with the US to persist, the situation is still fluid.
The UK was the first nation to negotiate a tariff agreement with the US, securing a 10% tariff on imports compared to the EU’s broader 15% rate. This early agreement may shield the UK from some of the immediate repercussions of the Supreme Court’s decision, but uncertainty looms large.
EU’s Cautious Approach
The EU is also assessing the ramifications of the Supreme Court’s ruling, continuing its efforts to negotiate lower tariffs on exports to the US. Following discussions at Trump’s Scottish golf course last July, a 15% tariff was established, yet 50% tariffs on steel remain in place. The EU underscored the importance of stability in transatlantic trade, asserting, “Businesses on both sides of the Atlantic depend on stability and predictability in the trading relationship.”

Both the UK and EU are looking for clarity on how the US administration plans to respond to the Supreme Court’s decision.
Business Community Reacts
The business community has responded with a mix of hope and caution. Companies impacted by the tariffs may be eligible for refunds, although the process is expected to be complicated due to the intricate nature of US import procedures. John Denton, Secretary General of the International Chambers of Commerce, highlighted the “fresh uncertainty” that this ruling introduces for businesses seeking to engage with the US market.
William Bain from the British Chambers of Commerce noted that while the court’s ruling clarified the use of executive powers for imposing tariffs, it did little to alleviate the ambiguity facing businesses. He warned that even with the ruling, the US could still impose additional tariffs under different legal frameworks.
Market Reactions
The stock market reacted positively to the Supreme Court’s announcement, with the UK’s FTSE 100 index reaching a new intraday high, closing 0.56% up. Exporters were among the biggest beneficiaries of this optimism. Diageo, known for its whisky and tequila brands, saw stock prices jump by 3.9%, while luxury fashion brand Burberry rose by 3.3%. European car manufacturers also experienced gains, with Stellantis shares climbing by 2%.

In contrast, US government bond prices fell, signalling investor concerns over potential losses from tariffs and the prospect of refunds for US companies. The dollar weakened slightly in response.
Why it Matters
This Supreme Court ruling marks a pivotal moment in international trade relations, particularly between the US, UK, and EU. The decision not only challenges the previous administration’s approach to tariffs but also opens the door for a potential reshaping of trade dynamics. For businesses reliant on predictable trade environments, the next steps from the US administration will be crucial in determining their strategies moving forward. The global economy remains on edge as stakeholders await clarity in a landscape that has become increasingly unpredictable.