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In a significant policy shift, U.S. President Donald Trump has announced plans to implement global tariffs of 15% on imports, a move prompted by the recent Supreme Court decision that overturned his previous import tax strategy. This latest development raises concerns among international trading partners, including the UK and Australia, who were negotiating lower tariffs with the U.S.
Overview of the Tariff Changes
On Friday, Trump revealed his intention to replace the 10% tariffs previously set to take effect on 24 February with a more robust 15% levy. This decision comes in response to a Supreme Court ruling that deemed his earlier global tariffs unconstitutional. The proposed increase is permissible under Section 122 of the Trade Act of 1974, which allows such tariffs to remain in place for up to five months before requiring Congressional approval.
The announcement was made via Trump’s Truth Social platform, where he expressed his discontent with the Supreme Court’s ruling, describing it as “ridiculous” and “poorly written”. The court, in a 6-3 decision, found that Trump had exceeded his authority when imposing the earlier tariffs under the International Emergency Economic Powers Act (IEEPA) of 1977.
Implications for Trade Agreements
The introduction of the new 15% tariffs complicates existing trade agreements with several nations. Countries such as the UK, which had negotiated a 10% tariff rate, will now be subject to the higher global tariff. Despite this, the UK’s agreements concerning specific sectors like steel and pharmaceuticals may still hold, as the UK government maintains that its privileged trading status with the U.S. should persist.

William Bain, head of trade policy at the British Chambers of Commerce, expressed concern over the potential negative implications for British businesses. He noted that the president’s reaction to the Supreme Court ruling could exacerbate challenges for international trade.
Responses from U.S. Business Leaders
The response from U.S. business leaders has been mixed. Drew Greenblatt, owner of Marlin Steel Wire Products, expressed disappointment with the Supreme Court’s ruling, suggesting it would adversely affect opportunities for American workers in manufacturing. Conversely, Virginia soybean farmer John Boyd regarded the ruling as a significant victory for those opposing Trump’s trade policies.
While advocates of the tariffs argue they are essential for reducing the trade deficit—currently at a staggering $1.2 trillion—critics are concerned that these new measures will hinder economic growth and exacerbate trade tensions.
Legal and Economic Considerations Ahead
The Supreme Court ruling has also opened avenues for businesses to seek refunds on tariffs deemed unlawful. Although the court did not resolve the issue of reimbursements, many companies and trade organisations have indicated their intention to pursue this matter vigorously. Neil Bradley, chief policy officer at the U.S. Chamber of Commerce, highlighted the importance of swift refunds for the 200,000 small business importers affected.

Senator Maria Cantwell has requested clarification from the U.S. Treasury on plans to handle these refunds, emphasising the need for an efficient process to return funds to American businesses. Meanwhile, political tensions are rising, with some Republicans suggesting that demands for refunds could backfire and ultimately benefit their party in upcoming elections.
Why it Matters
The escalation of tariffs to 15% underlines the precarious nature of international trade relations and signals potential volatility in the global economy. As nations grapple with the implications of these tariffs, businesses face an uncertain landscape that could impact consumer prices and economic stability. The outcome of this policy shift will not only affect American importers but may also reverberate through global markets, challenging established trade norms and agreements. The situation calls for careful attention from both policymakers and business leaders as they navigate these turbulent waters.