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Costco tariff refunds case grows will the Supreme Court overturn Trumps import duties and trigger billions in corporate paybacks this month?

Costco tariff refunds are now in play and billions hang on the Supreme Courts next move. Costco has already paid an estimated $90B in import tariffs tied to President Trumps baseline 10% to 50% duty increases, part of a record $195B collected in fiscal 2025, up from $118B last year. Now the court is reviewing whether the tariffs were legal under the IEEPA, after earlier rulings called them unlawful. If overturned, companies have until Dec. 15, 2025, to file claims and Costcos lawsuit could become the blueprint for massive corporate refunds.