Yes, Costco members who purchased products during the tariff period are being told they may be entitled to refunds. A federal class action lawsuit filed in March 2026 argues that Costco charged customers higher prices to offset tariff costs, then is seeking—and in some cases receiving—separate refunds from the federal government for those same tariffs. The lawsuit, brought by Matthew Stockov in U.S. District Court in Chicago, alleges this amounts to a “double recovery” at the expense of shoppers who paid the inflated prices in the first place. The case hinges on a landmark Supreme Court decision from February 2026 that struck down tariffs imposed by executive order, declaring them unconstitutional. The stakes are significant.
The federal government has already processed more than $35 billion in tariff refunds as of May 12, 2026, with an estimated $166 billion in total refunds owed across all U.S. importers. Costco, as one of the largest retailers in the country, would be eligible for substantial refunds from the federal government—potentially hundreds of millions of dollars. The class action lawsuit seeks to ensure that Costco members, not just the company itself, benefit from those refunds. However, Costco has fought back. In May 2026, the retailer filed a motion to dismiss the case, arguing that the lawsuit is premature and that the plaintiff has not yet suffered concrete harm. The outcome of this motion, and the broader case, remains uncertain, though legal experts say the arguments cut to the heart of consumer protection law.
Table of Contents
- What Is the Costco Tariff Refund Class Action Lawsuit?
- How Did the Supreme Court Decision Impact Costco’s Tariff Practices?
- Who Qualifies as a Member of the Costco Tariff Class Action?
- How Can Costco Members File a Claim or Seek Refunds?
- What Are the Key Challenges and Risks in the Costco Tariff Case?
- How Much Has Been Refunded So Far?
- What’s Next in the Costco Tariff Refund Class Action?
- Conclusion
What Is the Costco Tariff Refund Class Action Lawsuit?
The lawsuit centers on a simple but powerful premise: Costco allegedly passed tariff costs directly to customers through higher prices during the class period of February 1, 2025, through February 24, 2026. During this period, the Trump administration imposed sweeping tariffs under the International Emergency Economic Powers Act (IEEPA), based on declared emergencies including illicit drugs and trade deficits, plus reciprocal tariffs on imports from nearly every country. When you bought a product at Costco during these months—whether a television, clothing item, electronics, or imported food product—the tariff cost was baked into the price you paid at the register. The problem, according to the lawsuit, is that Costco did not simply eat the tariff costs or pass them through transparently. Instead, the company charged customers the tariffed prices and kept the difference as higher margins.
Then, after the Supreme Court ruled the tariffs unconstitutional in February 2026, and the federal government opened a tariff refund portal in April 2026, Costco became eligible to file for refunds on those same tariffs—effectively getting paid twice. The first time was from customers who paid the tariffed prices. The second time is from the federal government’s tariff refund program. According to the lawsuit, this leaves consumers out in the cold. The class action covers Costco members in Illinois, California, Florida, Michigan, Missouri, New Jersey, New York, Ohio, Washington, and Wisconsin who purchased products subject to IEEPA tariffs during the class period. The lawsuit does not allege that Costco acted illegally in charging the tariffs; rather, it argues that because the tariffs themselves were unconstitutional, consumers deserve to be made whole through the class action process.
How Did the Supreme Court Decision Impact Costco’s Tariff Practices?
On February 20, 2026, the U.S. Supreme Court issued a landmark 6-3 decision in Learning Resources, Inc. v. Trump that fundamentally changed the tariff landscape. The Court held that tariffs imposed under the International Emergency Economic Powers Act—an executive authority—are unconstitutional. Only Congress, the Court ruled, has the power to impose tariffs under the Constitution. This decision eliminated the legal foundation for the tariffs that Costco (and every other retailer) had been passing on to customers for over a year.
The Supreme Court ruling essentially declared that every tariff imposed under the IEEPA since the emergency declarations was invalid. This included reciprocal tariffs on imports from China, Mexico, Canada, the European Union, and dozens of other countries, as well as tariffs justified by declared emergencies. For consumers, this meant the higher prices they paid were for duties that had no legal basis. For retailers like Costco, it meant they became eligible to request refunds from the federal government for the tariffs they had paid to Customs and Border Protection. Just two months later, on April 20, 2026, the U.S. Customs and Border Protection opened a dedicated tariff refund portal, allowing importers and retailers to file claims for refunds on tariffs paid under the now-unconstitutional authority. Costco wasted no time; the company’s eligibility for refunds would be substantial given the volume of imported goods sold through its warehouses. However, the timing of the Court’s decision and the refund portal is central to the class action lawsuit: customers paid tariffed prices before the decision, and the company is now receiving refunds that those same customers never will unless the class action succeeds.
Who Qualifies as a Member of the Costco Tariff Class Action?
The Costco tariff class action covers a broad group of consumers, but membership is not automatic. To qualify, you must have been a Costco member who purchased at least one product subject to IEEPA tariffs between February 1, 2025, and February 24, 2026. The class period spans the entire window during which the now-unconstitutional tariffs were in effect. You do not need to have purchased a specific product or amount; any purchase of a tariffed item during these dates potentially qualifies you for membership. The geographic scope is limited to 10 states: Illinois, California, Florida, Michigan, Missouri, New Jersey, New York, Ohio, Washington, and Wisconsin. If you purchased tariffed products from Costco in any of these states during the class period, you are likely part of the class.
If you lived in another state and shopped at Costco, you would not be included in this particular class action, though similar lawsuits could be filed in other jurisdictions. A specific example: if you bought a television, winter coat, kitchen appliance, or imported food item at a Costco warehouse in California in August 2025, you would almost certainly be eligible for the class action, because those products were subject to the IEEPA tariffs during that time. The challenge in this lawsuit is that Costco does not separately itemize tariffs on receipts. Customers did not see “Federal Tariff: $5.00” on their receipts; they saw only the final price. This makes it difficult to prove precisely how much each consumer overpaid, though that is exactly the kind of damage calculation that class action settlements typically involve. Costco’s transaction records would be the primary evidence used to determine class membership.
How Can Costco Members File a Claim or Seek Refunds?
There are two separate pathways for Costco customers to potentially recover money. The first is through the federal tariff refund portal itself, which opened April 20, 2026. However, this portal is designed for importers, wholesalers, and retailers—entities that paid tariffs directly to Customs and Border Protection. As an individual consumer, you cannot file directly through the federal portal; you paid tariffs indirectly through the prices Costco charged you. Instead, individual consumers would need to pursue recovery through the class action lawsuit. The class action lawsuit is still in its early stages. Matthew Stockov filed the case in March 2026, and Costco filed a motion to dismiss in May 2026. If the motion is denied and the case proceeds, class members will eventually receive notice of the lawsuit, typically by mail or email.
You will not need to do anything to be included in the class—you will be automatically considered a class member if you meet the criteria (Costco member, purchased tariffed products, class period, qualifying state). However, if the class action settles or proceeds to judgment, you may need to submit a claim form to receive your share of any recovery. This claim form process typically requires some proof of purchase, such as receipts or Costco membership records. The key difference is timing and control. The federal refund portal is moving quickly, with over $35 billion already processed as of May 12, 2026. The class action could take months or years to resolve, given that Costco is fighting the case. However, the class action is your potential avenue to recover money that was taken from your wallet at the point of sale, whereas the federal portal benefits retailers themselves. For most consumers, waiting for the class action is the realistic path to recovery.
What Are the Key Challenges and Risks in the Costco Tariff Case?
The Costco lawsuit faces significant obstacles, starting with the company’s motion to dismiss filed May 18, 2026. Costco’s primary argument is that the case is premature. The company contends that the plaintiff, Matthew Stockov, has not yet suffered concrete harm that would justify the lawsuit. Costco’s logic is that because the federal tariff refund process is still ongoing, and the company has not yet made a final decision about how (or whether) to distribute any refunds it receives, consumers cannot yet claim they have been injured. This is a legal argument, not a factual one, but it is one that courts sometimes find persuasive. If the judge agrees with Costco and grants the motion to dismiss, the lawsuit could end before it even progresses to the discovery phase. Even if the motion is denied, Costco will likely argue that consumers cannot prove they overpaid, because the company may claim it absorbed some or all of the tariff costs rather than passing them on.
Costco could also argue that the Supreme Court’s tariff decision does not create a private right of action—meaning consumers cannot sue for refunds, only the federal government can address the issue through its own refund program. These are sophisticated legal arguments that could take months to litigate. Another major uncertainty is the timeline. Even if the class action survives Costco’s motion to dismiss and proceeds to settlement or trial, it could easily take 12 to 24 months or longer. During that time, consumers will have no recovery, while Costco continues to process federal refunds and potentially uses that money for other purposes. Additionally, there is no guarantee of success. Courts have been unpredictable on tariff-related litigation, and a judge could side with Costco’s arguments, leaving class members with nothing.
How Much Has Been Refunded So Far?
The scale of federal tariff refunds gives some indication of the potential stakes in the Costco lawsuit. The U.S. government has estimated that a total of $166 billion in tariff refunds are owed to all importers and retailers across the entire United States economy. This is the cumulative total of all tariffs collected under the now-unconstitutional IEEPA authority. As of May 12, 2026, the U.S. Customs and Border Protection reported that $35.46 billion in tariff refunds had already been processed, according to a sworn declaration filed in U.S. Court of International Trade.
Costco’s share of those refunds is not publicly disclosed, but the company’s volume of imported goods is enormous. Costco operates over 600 warehouses globally and over 500 in the United States, importing billions of dollars’ worth of goods annually from China, Mexico, and other countries. Even a modest estimate suggests Costco could be eligible for hundreds of millions of dollars in tariff refunds—potentially over $1 billion depending on the company’s import footprint during the tariff period. If Costco is indeed seeking to keep those refunds without passing any portion back to consumers, the class action’s potential recovery becomes clearer. The $35.46 billion in refunds already processed represent money that has left the federal treasury and gone to importers and retailers. In the absence of the class action, Costco would keep its share. With the class action, there is a possibility—though not a certainty—that some or all of Costco’s refunds could be redirected to consumers who actually paid the higher prices.
What’s Next in the Costco Tariff Refund Class Action?
The immediate next step is the judge’s decision on Costco’s motion to dismiss. Depending on how quickly the court rules, this could happen within the next few weeks or extend into the summer of 2026. If the motion is denied, the case will proceed to discovery, where both sides will exchange documents and evidence. This phase typically takes several months and will involve Costco producing its pricing records, tariff cost data, and information about any decisions regarding refunds. Regardless of the outcome of the Costco case specifically, the broader tariff refund landscape is evolving. Other retailers and consumer groups are likely to pursue similar class actions.
The legal precedent set by Learning Resources v. Trump is strong enough that plaintiffs’ attorneys view the field as fertile ground for class action lawsuits. Costco members should watch for news about the motion decision and any future settlement announcements. If a settlement is reached, class members will receive notice, typically by mail, explaining the terms and how to submit a claim. For now, Costco members in the eligible states who purchased tariffed products during the class period should keep their receipts and membership records. If you have any documentation of purchases from February 2025 through February 2026, preserve it, as it may be needed to prove class membership or calculate your individual claim amount in the event of a settlement or judgment.
Conclusion
The Costco tariff refund class action represents an important effort to prevent retailers from benefiting twice from unconstitutional tariffs—once through inflated prices charged to consumers, and again through federal refunds. The lawsuit is based on a solid legal foundation: the Supreme Court’s February 2026 decision invalidating IEEPA tariffs. However, the case faces real obstacles, including Costco’s motion to dismiss and the inherent difficulty of proving individual damages in a case involving millions of transactions and unmarked tariff costs.
Class members should monitor the case’s progress through court filings and news reports. While the federal tariff refund program continues to pay out billions of dollars to importers and retailers, consumers have no automatic right to those refunds. The class action lawsuit is currently the most viable path for Costco members to recover money. If you purchased tariffed products from Costco in one of the 10 eligible states between February 2025 and February 2026, you are likely part of the class, and you should keep your records and watch for future notifications about claim filing deadlines or settlement announcements.
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