Costco is now facing a proposed nationwide class action lawsuit that could reshape how companies handle tariff refunds in the United States. The case centers on billions of dollars in tariffs imposed by the Trump administration that the U.S. Supreme Court recently ruled unconstitutional.
If companies like Costco eventually receive refunds for those tariffs, the lawsuit argues the money should go back to the consumers who ultimately paid higher prices at checkout.
The Lawsuit Against Costco
The proposed class action lawsuit was filed in federal court in Illinois by a Costco shopper seeking refunds tied to tariff-related price increases.
The case argues that if Costco receives refunds from tariffs previously paid to the U.S. government, the company should return those funds to customers who paid higher prices as a result of those tariffs.
According to the complaint:
“This lawsuit seeks to prevent Costco, the third-largest retailer in the world, from double recovery.”
The filing also states:
“Costco has made no commitment to return any portion of anticipated tariff refunds to the consumers who bore those costs.”
The lawsuit seeks a court declaration that Costco must refund customers if it receives reimbursement for tariffs paid under the International Emergency Economic Powers Act, commonly known as IEEPA.
Costco has not publicly commented on the lawsuit at the time of writing.
The Supreme Court Ruling That Triggered the Dispute
The legal battle stems from a major Supreme Court decision issued on February 20.
The Court ruled that President Donald Trump exceeded his authority when he imposed tariffs using IEEPA. The law allows presidents to take economic action during national emergencies, but the Court determined it does not authorize the executive branch to impose tariffs.
The ruling sent the case back to lower courts and opened the door for companies to seek refunds on tariffs that had already been paid.
Thousands of companies have now filed claims in the U.S. Court of International Trade seeking reimbursement.
Retailers, manufacturers, shipping firms, and other import-heavy businesses are attempting to recover the funds they paid to the government while the tariffs were in place.
Costco and Other Companies Seeking Refunds
Costco is among more than 2,000 companies that have filed lawsuits in the Court of International Trade seeking tariff refunds.
However, the class action lawsuit argues that if Costco receives those refunds, the money should not simply be retained by the company.
Instead, the lawsuit claims that consumers were the ones who actually bore the cost.
The filing also states that Costco has only suggested that tariff refunds might eventually benefit shoppers indirectly through lower prices.
According to the complaint, Costco has promised only:
“a possible future benefit to an indeterminate group of future shoppers.”
That language has become central to the lawsuit’s argument that the company should be legally required to return refunds to customers.
What Costco’s CEO Has Said
Costco CEO Ron Vachris addressed the tariff situation during a recent discussion with analysts.
Vachris said it remains uncertain whether companies will receive refunds or how the process will work.
If refunds do eventually occur, Vachris indicated that Costco would likely reinvest the money into lower prices and improved value for customers.
That approach reflects Costco’s long-standing strategy of using its buying power and operational efficiency to maintain low prices.
However, the lawsuit claims that lowering prices in the future does not compensate customers who already paid higher prices due to tariffs.
FedEx Is Facing a Similar Lawsuit
Costco is not the only company dealing with legal challenges tied to tariff refunds.
FedEx has also been sued in a class action case after filing its own lawsuit to recover tariff payments.
Shippers who paid higher transportation costs due to tariffs filed the lawsuit seeking reimbursement if FedEx receives tariff refunds.
FedEx previously said it intends to refund customers if it receives reimbursement from the government.
The company stated:
“If refunds are issued to FedEx, we will issue refunds to the shippers and consumers who originally bore those charges.”
However, the lawsuit claims that statement is not legally binding and seeks a court order to ensure refunds occur.
The outcome of these cases could set precedent for how corporations handle tariff reimbursements across multiple industries.
Who Actually Pays Tariffs?
A key issue in the lawsuits is who ultimately pays tariffs.
Many consumers assume foreign countries pay tariffs, but economic research shows that U.S. businesses and consumers absorb most of the costs.
A study from the Federal Reserve Bank of New York found that American businesses and consumers bore about 86 percent of tariff costs as of late 2025.
Foreign exporters absorbed only about 14 percent of the burden.
Earlier in the year, the share borne by Americans was even higher.
Between January and August of 2025, U.S. firms and consumers absorbed approximately 94 percent of tariff costs.
Another analysis from the Congressional Budget Office reached similar conclusions.
The CBO estimated that foreign exporters absorbed roughly 5 percent of tariff costs, while American companies and consumers paid the remaining 95 percent.
Those findings have strengthened legal arguments that consumers were the true economic victims of tariffs.
The Massive Scale of Potential Refunds
The scale of potential refunds could be significant.
During the years the tariffs were in place, companies paid billions of dollars in duties on imported goods.
Retailers such as Costco rely heavily on global supply chains for products ranging from electronics to home goods.
Tariffs on those imports raised costs for companies.
Many businesses passed those costs along to consumers through higher prices.
If courts ultimately rule that those tariffs must be refunded, the total payouts could reach into the billions.
How those refunds are distributed could become one of the largest consumer compensation debates in recent years.
Why Investors Should Pay Attention
For investors, the lawsuits raise several important issues.
First, tariff refunds could provide a one-time financial boost to companies that recover funds from the government.
Retailers with large import volumes could receive substantial reimbursements.
Second, the class action lawsuits create uncertainty about whether those refunds can be kept as corporate profits.
If courts rule that companies must pass refunds directly to customers, the financial benefit to corporations may disappear.
Third, the lawsuits highlight broader risks tied to government policy.
Trade policies can dramatically impact corporate earnings, supply chains, and pricing strategies.
When policies are reversed or ruled unconstitutional, companies may face complicated legal consequences.
Investors should also watch how companies communicate with consumers about pricing.
Retailers that voluntarily pass savings back to shoppers may gain reputational advantages over competitors.
What Happens Next
The Costco class action lawsuit is still in its early stages.
The court must first determine whether the case can proceed as a nationwide class action.
If the case moves forward, it could take years to resolve.
Meanwhile, the separate tariff refund cases filed by companies in the U.S. Court of International Trade will continue working their way through the legal system.
Those rulings will determine whether businesses are entitled to reimbursement for tariffs paid under IEEPA.
Only after that issue is resolved will courts decide whether those refunds must be shared with consumers.
For now, the lawsuits represent the first major legal effort to determine who truly owns tariff refunds.
The Bigger Picture
The legal fight over tariff refunds highlights a deeper economic reality.
Tariffs are often described as penalties paid by foreign countries.
In practice, they function more like taxes paid by domestic companies and consumers.
The ongoing lawsuits could help clarify that reality.
If courts ultimately rule that consumers deserve refunds, it could reshape how tariffs are understood in future trade debates.
For companies like Costco, the outcome could influence pricing strategies and customer relations for years to come.
And for investors, the case represents another reminder that trade policy can ripple through corporate earnings in unexpected ways.
About Author
