What is the Costco tariff class action lawsuit about?

The lawsuit alleges Costco raised prices on imported goods to offset tariffs imposed in February 2025 under the International Emergency Economic Powers Act. After the Supreme Court ruled those tariffs unlawful in February 2026, Costco stands to recover billions in import duties but has not directly refunded the shoppers who paid higher prices. Plaintiffs claim this amounts to unjust enrichment.

Who qualifies for the Costco tariff class action lawsuit?

If the case moves forward, potential class members could include any U.S. Costco shopper who purchased imported goods affected by tariffs between February 2025 and February 2026. Given Costco's tens of millions of members, this could involve millions of consumers nationwide.

How much could I get from the Costco tariff lawsuit?

Most payouts in consumer class actions of this type are relatively modest, typically around $5 to $50 per person for average shoppers. Higher amounts are possible if proof of purchase is required and payments are based on spending levels. If no proof is required, payments tend to be smaller due to more claims being filed.

Is there a Costco tariff class action claim form available?

No. There is no claim form available yet. The case must go through class certification, court rulings on early motions, and either a settlement or trial outcome before claims open. Even in a relatively fast case, claim forms typically do not become available for 12 to 24 months or longer.

What are the odds the Costco tariff lawsuit will settle?

There is an estimated 50 to 70 percent chance of settlement. Most large consumer class actions resolve before trial, especially when the potential class size is large and evidence links pricing decisions to specific factors. However, Costco could argue pricing was influenced by multiple factors beyond tariffs, which may complicate the case.

Could the Costco tariff lawsuit set a legal precedent?

Yes. This case raises a broader legal question: when companies pass government-imposed costs to consumers and later recover those costs, are they required to return that money to customers? If the court sides with plaintiffs, it could influence how all retailers handle pricing adjustments tied to government policies in the future.

Costco Class Action Lawsuit 2026: Shoppers Overcharged Due to Tariffs May Not Get Refunds

By Steve Levine

Costco Class Action Lawsuit 2026 Tariff Overcharge Refund Shoppers Unjust Enrichment

Published: March 31, 2026

A new class action lawsuit against Costco Wholesale Corporation is raising a major question for everyday shoppers across the United States: If prices were increased because of government tariffs that were later ruled unlawful, should customers get that money back?

According to the lawsuit, millions of Costco shoppers may have paid higher prices in 2025 and early 2026, and may never be directly reimbursed.

Why Costco Is Being Sued

The case centers on tariffs imposed in February 2025 under the International Emergency Economic Powers Act during the administration of Donald Trump.

Retailers, including Costco, allegedly responded by increasing prices on imported goods to offset the added costs.

However, in February 2026, the Supreme Court of the United States ruled that certain tariffs were unlawful. This decision allows companies to recover billions of dollars in import duties previously paid.

The lawsuit claims Costco could now benefit twice:

First, by charging customers higher prices at checkout.

Second, by receiving refunds from the government.

Plaintiffs argue this creates unjust enrichment, meaning the company keeps money that was effectively paid by customers.

What Costco Has Said

Costco CEO Ron Vachris has indicated that any recovered tariff funds would likely be used to lower prices in the future.

But the lawsuit argues that this does not compensate the specific shoppers who paid higher prices during the tariff period between February 2025 and February 2026.

Instead, future customers could benefit, while past customers receive nothing.

Who Could Be Affected

If the case moves forward, the potential class could include:

U.S. Costco shoppers who purchased imported goods impacted by tariffs between February 2025 and February 2026.

Given Costco's massive customer base of tens of millions of U.S. members, this could involve millions of consumers nationwide.

What Evidence Is Being Used

The complaint reportedly relies on:

Public statements: Costco's own acknowledgments of tariff-related price increases.

Pricing changes: Price adjustments observed after tariff pressure eased.

Communications: Internal and external communications linking tariffs to product pricing.

Plaintiffs argue this shows a direct connection between tariffs and what customers paid.

When Will a Claim Form Be Available?

There is no claim form available yet.

Before claims open, the case must go through several stages:

Class certification -- the court must approve the case as a class action.

Court rulings on early motions -- Costco will likely file motions to dismiss.

A settlement or trial outcome -- the case must be resolved before money is distributed.

Even in a relatively fast case, claim forms typically do not become available for 12 to 24 months or longer.

How Many People Are Affected?

Potentially millions of shoppers.

Costco has tens of millions of U.S. members, and anyone who purchased tariff-affected goods during the relevant period could be included. The final number will depend on which products are included, how the class is defined, and whether proof of purchase is required.

When Will This Class Action Be Certified?

Class certification usually occurs 1 to 3 years after filing.

The court will evaluate whether the claims are similar across a large group and whether a class action is the appropriate legal path.

Costco is expected to challenge certification, which could delay the process.

What Are the Odds This Case Is Settled?

There is a moderate likelihood of settlement.

Most large consumer class actions resolve before trial, especially when the potential class size is large and there is evidence linking pricing decisions to specific factors.

However, this case may be more complex because Costco could argue that pricing decisions were influenced by multiple factors, not just tariffs.

Estimated probability: 50 to 70 percent chance of settlement, depending on how early rulings go.

What Is the Anticipated Settlement Amount?

The total settlement amount is uncertain but could reach tens or even hundreds of millions of dollars.

Key factors include:

Tariff refunds: The total amount Costco receives back from the government.

Consumer impact: How much of those costs were passed to shoppers.

Claim volume: The number of valid claims submitted.

Because of Costco's scale, even small per-transaction impacts could lead to a large overall settlement.

How Much Could Each Claimant Get?

Most payouts in cases like this are relatively modest.

Typical estimates: Around $5 to $50 per person for average shoppers.

Higher amounts possible if: Proof of purchase is required and payments are based on spending levels.

If no proof is required, payments are usually smaller due to a larger number of claims.

Could This Case Set a Bigger Precedent?

This lawsuit could have broader implications beyond Costco.

It raises a key legal question: When companies pass costs to consumers and later recover those costs, are they required to return that money?

If the court sides with the plaintiffs, it could influence how companies handle pricing adjustments tied to government policies in the future. This could affect retailers, importers, and any company that adjusts consumer prices based on government-imposed costs.

Bottom Line

This Costco class action is still in its early stages, and no compensation is guaranteed.

However, the case highlights a situation where consumers may have paid higher prices due to tariffs that were later ruled unlawful, while the company could recover those costs without directly refunding customers.

If the lawsuit succeeds or settles, millions of shoppers could become eligible for compensation.

How Do I Find Class Action Settlements?

Find all the latest class actions you can qualify for by getting notified of new lawsuits as soon as they are open to claims:

About This Article

This article covers the class action lawsuit filed against Costco Wholesale Corporation alleging that shoppers were overcharged due to tariffs later ruled unlawful by the Supreme Court. The case is still in its early stages and no settlement or claim form is currently available. OpenClassActions.com covers class action lawsuits, settlements, and consumer legal developments. OpenClassActions.com is a consumer advocacy and class action news site, and is not a class action administrator or a law firm.

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