The U.S. government is launching a tariff refund portal on April 20, 2026, allowing businesses to request refunds for $166 billion in tariffs that the Supreme Court struck down in February as unlawful. This affects thousands of importers who paid duties on goods during the tariff period, and the refund process will determine how quickly businesses can recover those costs. The Supreme Court's February ruling invalidated most of Trump's tariff orders, making this refund system the mechanism for returning billions to affected companies.