Costco Wholesale Corp. has filed a lawsuit against the U.S. government to secure refunds if the Supreme Court rules against President Donald Trump’s tariffs. The complaint was submitted on November 28 in the U.S. Court of International Trade. Costco is among a growing number of companies challenging the legality of the tariffs imposed under the International Emergency Economic Powers Act. The Supreme Court heard arguments regarding the tariffs on November 5. The justices have expedited the case but have not indicated when a decision will be made. In the meantime, businesses are seeking clarity on their eligibility for refunds if the tariffs are deemed unlawful. Costco's legal team expressed concerns about the uncertainty surrounding refunds for businesses that have been paying duties. The company stated that U.S. Customs and Border Protection denied its request for an extension to finalize tariff calculations, which could hinder its ability to claim full refunds in the future. Costco did not disclose the financial impact of the tariffs on its operations. However, the company emphasized the need for immediate court intervention to protect its interests. A White House spokesperson commented on the situation, stating, "The economic consequences of the failure to uphold President Trump’s lawful tariffs are enormous, and this suit highlights that fact. The White House looks forward to the Supreme Court’s speedy and proper resolution of this matter." During the Supreme Court arguments, justices from both sides of the political spectrum expressed skepticism about the legality of the tariffs, which have generated significant revenue. Lower federal courts have ruled against the administration in several earlier lawsuits, but the tariffs remain in effect pending the Supreme Court's decision. Other notable companies, including Revlon and Kawasaki Motors, have also filed lawsuits related to the tariffs. The ongoing tariff policies have disrupted the retail sector, leading to increased prices for consumers. Costco has implemented various strategies to mitigate the impact of tariffs, such as reducing the number of suppliers and increasing local sourcing. The company has also adjusted its product offerings based on price changes. The case is officially titled Costco Wholesale Corp. v. Customs and Border Protection, 1:25-cv-316, in the U.S. Court of International Trade. As the legal battle unfolds, Costco and other businesses await the Supreme Court's ruling, which could have significant implications for their financial futures and the broader retail landscape.