The U.S. government is launching a refund portal Monday for businesses that paid tariffs the Supreme Court ruled unconstitutional in February 2026 — about $166 billion total paid by over 330,000 importers on more than 53 million shipments. Around $127 billion in refunds are eligible in the first phase, with CBP processing taking 60-90 days per approved claim. The first phase is limited to recent tariffs that were estimated or final within 80 days, and importers must carefully declare all document numbers or risk having entire entries rejected. This is the first step toward potential refunds for consumers as well, though those will take longer and flow more slowly as businesses process their own reimbursements.