A Costco in a shopping complex in Reno, Nevada, pictured on April 18, 2025. William Hale Irwin/Sipa USA/AP New York Reuters —

Costco has sued the US government to ensure it will receive refunds if the Supreme Court rejects President Donald Trump’s bid for sweeping authority to impose tariffs.

In a complaint filed Friday in the US Court of International Trade in Manhattan, Costco ( COST ) said Trump’s use of the International Emergency Economic Powers Act to impose tariffs left it uncertain whether businesses can recoup sums they should not have paid.

Based in Issaquah, Washington, Costco joined dozens of companies suing to safeguard potential refunds. It is also among the largest, with $275.2 billion of revenue in its fiscal year ending August 31.

The nation’s largest wareh

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