In a dramatic policy shift following a Supreme Court rebuke, former President Donald Trump has triggered widespread uncertainty across global trade networks by implementing a new 15% tariff regime. The move comes after the Supreme Court ruled on Friday that Trump’s previous use of the International Emergency Economic Powers Act to impose global tariffs was unlawful.
Within hours of the ruling, Trump invoked Section 122 of the 1974 Trade Act to establish a temporary 10% tariff on imports from all trading partners, only to announce via social media on Saturday that the rate would increase to 15%. This abrupt policy reversal has created particular complications for nations like the UK and Australia that had previously negotiated bilateral agreements locking in 10% rates.
Trade experts note that Section 122 requires non-discriminatory application of tariffs, potentially nullifying previously negotiated bilateral agreements. Paul Ashworth of Capital Economics emphasized that major trading partners including the EU and Japan now find themselves in the same position as before their individual deals were struck.
The British Chambers of Commerce estimates the increased tariff rate will add £2-3 billion in additional costs for UK exporters, affecting approximately 40,000 businesses. Industries ranging from food and beverages to textiles, industrial goods, and electrical products face overnight increases in export expenses that will inevitably be passed along supply chains.
Meanwhile, the Supreme Court’s ruling opens the possibility for companies to reclaim approximately $130 billion in tariffs paid since last April, though the refund process remains undefined and potentially protracted. Hundreds of firms have already initiated legal proceedings to secure refunds, creating additional contractual uncertainties throughout global supply networks.
Economists note that US consumers ultimately bear the majority of tariff costs, with research from Yale University and the New York Federal Reserve indicating between 31-90% of additional expenses are passed through to American households via higher prices. The ongoing uncertainty is already prompting businesses to diversify trade relationships toward European and Indo-Pacific markets, potentially creating lasting shifts in global trade patterns beyond the immediate financial impacts.