The Tariff Refund MDL Reaches the JPML, and the Arbitration Clauses Are Waiting Behind It

The Judicial Panel on Multidistrict Litigation hears argument in Chicago on Thursday, 24 September 2026, on whether to create the first tariff refund MDL, a petition docketed as MDL No. 3197, In re: Amazon Tariff Litigation. Behind that argument sit roughly 100 consumer class actions filed in nearly 30 federal districts since the Supreme Court struck down the International Emergency Economic Powers Act tariffs on 20 February 2026, and a defense that most of the commentary has treated as a footnote: a large share of these claims are governed by an Arbitration Clause, and the fight over whether they can be aggregated at all may be decided by forum rules rather than by anything a jury would recognize as the merits.

That is the structural point the first page of search results misses. The law-firm alerts catalogue standing, ripeness and the voluntary payment doctrine; the case trackers count complaints. Neither set connects the centralization petitions to the arbitration machinery that several of the same defendants have been rebuilding all year. A tariff refund MDL would gather the court-side cases. It would do nothing about the ones headed to a provider.

What the JPML decides in Chicago on 24 September 2026

Section 1407 centralization is a housekeeping decision with strategic consequences. The Panel asks whether the actions share one or more common questions of fact, and whether transfer will serve the convenience of parties and witnesses and promote the just and efficient conduct of the litigation. It does not decide the merits, does not decide Class Certification, and does not decide Arbitrability.

What it does decide is who supervises the next two years. A single transferee judge in a Multidistrict Litigation (MDL) sets a common pleading schedule, resolves the motions to dismiss once instead of thirty times, and controls the sequence in which threshold defenses are heard — including, critically, whether a Motion to Compel Arbitration is taken up before or after the pleading challenges. Defendants in this wave have good reason to want that sequencing in a forum of their choosing, or to want no common forum at all.

The Panel's September session in Chicago also carries the two manufacturer-specific spinal cord stimulator petitions, the Apple AirTag stalking actions, motions arising from a multistate cyclosporiasis outbreak, and an antitrust docket over collegiate eligibility rules. The tariff petition is the outlier on that list: it is not a products case, there is no injury in the tort sense, and the common question is not causation but pricing.

What is the Amazon tariff refund MDL?

MDL No. 3197, In re: Amazon Tariff Litigation, began with a motion to transfer filed on 1 August 2026 by plaintiffs Mari Cartagenova and others, seeking centralization in the Western District of Washington — Amazon's home district, and the court where the lead cases already sit. The two anchor actions, Markland v. Amazon.com, Inc. and Rosen v. Amazon.com, Inc., Nos. 2:26-cv-01670 and 2:26-cv-01823, were filed in May 2026 and consolidated on 29 June 2026 after the district court found the allegations essentially identical.

The theory is compact. Amazon raised prices on imported goods while the IEEPA tariffs were in force, told customers the increases reflected those duties, and is now positioned to recover the duties from the government. The named plaintiff in Markland, represented by Hagens Berman Sobol Shapiro, bought a China-made vacuum cleaner and a Vietnam-made audio adapter inside the class period, which the complaint frames as February 2025 to February 2026 — from the first 10% IEEPA levy on Chinese imports in early February 2025 through the date of the Supreme Court's decision. On 30 July 2026 Amazon reported roughly $600m in tariff refunds and said it would repay customers automatically only where a specific import charge can be traced to a specific order.

A second petition is larger and more ambitious. In re: Retailer Tariff Litigation, MDL No. 3202, was filed on 14 August 2026 and seeks to sweep in cases against a dozen or more retailers at once. Plaintiffs' amended motion asks the Panel to transfer and centralize 26 actions in the Northern District of Illinois, pointing to four cases already pending there against Costco Wholesale, Shein, Temu and J.M. Smucker, and arguing that Chicago is the natural home because the district has run consumer multidistrict dockets before and many of the retailers have substantial operations nearby. The motion frames the common question in a single line: every action alleges that the retailer defendants were unjustly enriched by keeping excess profits from shifting the economic burden of unlawful tariffs onto consumers, or violated state consumer protection statutes.

One caution on the docket mechanics, because the public record is genuinely thin here. MDL No. 3202 was filed on the same day the Panel's September hearing session order issued, and the Panel does not ordinarily hear a petition briefed that late in the cycle. The Amazon petition is the one publicly reported as being argued on 24 September 2026. Whether the 26-case cross-industry motion is heard at the Panel's next session, or folded into the Amazon docket, has not been stated in any source available at the time of writing, and it is not worth guessing at.

Petition	Docket	Filed	Transferee district sought	Anchor defendants
In re: Amazon Tariff Litigation	MDL No. 3197	1 August 2026	Western District of Washington	Amazon.com, Inc.
In re: Retailer Tariff Litigation	MDL No. 3202	14 August 2026	Northern District of Illinois	Costco Wholesale, Shein, Temu, J.M. Smucker and others

Will the JPML create a tariff refund MDL?

The defense filings from the week of 7 September 2026 are the best available read on how hard this will be fought. On 10 September 2026 more than a dozen companies, Amazon and Costco among them, filed a joint opposition. Their central argument is that there is no industry-wide pricing decision tying the defendants together — that each company set its own prices, under its own supply arrangements, for its own product mix, and that a common forum would therefore multiply rather than reduce work. They add a discovery point with real force: each defendant's pricing decisions and agreements with distributors and retailers are, in their words, highly sensitive and confidential trade secret information, and a cross-industry docket would put competitors' pricing files into a shared protective order.

Costco filed separately on 11 September 2026 with a narrower and more pointed argument. It has a pending motion to dismiss in Stockov v. Costco Wholesale, No. 1:26-cv-02734 (N.D. Ill.), filed on 18 May 2026 before Judge Steven Seeger on ripeness and no-injury grounds. If that motion succeeds, Costco told the Panel, it would dispose of the Costco actions entirely, leaving nothing to centralize.

There is a recent precedent worth holding in mind. In June 2026 the Panel declined to build an industry-wide spinal cord stimulator MDL spanning four manufacturers, creating a single manufacturer-specific docket instead and sending the rest back to their home districts. That instinct — resisting a defendant-diverse MDL where the common question is conduct-level rather than product-level — cuts directly against the 26-case retailer petition and rather less against the Amazon-only one. A single-defendant tariff refund MDL is the easier sell; a cross-industry one asks the Panel to treat "raised prices during the tariff period" as a shared factual question when the pricing decisions were made in a dozen boardrooms.

Why these cases exist at all: the refund asymmetry

In Learning Resources, Inc. v. Trump, No. 24-1287, decided 20 February 2026 by a vote of 6-3 in an opinion by Chief Justice Roberts, the Supreme Court held that IEEPA does not authorize the President to impose tariffs. That created the largest tariff refund exercise in United States history, and with it a structural asymmetry that is the engine of every case in this wave.

The refund runs to the importer of record. Customs and Border Protection had collected on the order of $166bn in IEEPA duties by early March 2026 from more than 330,000 importers across more than 53 million entries, with projections of up to roughly $175bn once statutory interest is added. Those funds are being processed through CBP's Consolidated Administration and Processing of Entries system and, for contested entries, through the Court of International Trade, where Judge Eaton designated Freestyle World, Inc. v. United States as the lead case for the consolidated refund litigation after the previous lead voluntarily dismissed. Consumers are nowhere in that structure. A shopper who paid a tariff-inflated price has no entry number, no protest right, and no claim against the government.

The consumer bar's response was to go after the intermediary. If a retailer priced the duty into the shelf price and then collects the duty back, the argument runs, it has been paid twice for the same cost. The claims are pleaded as unjust enrichment, as breach of contract, and under state consumer protection statutes — in the Cook County actions filed against Temu and Shein in March 2026 by McGuire Law, under the Illinois Consumer Fraud Act, with allegations that prices on some items rose by as much as 377%.

Date	Event
4 February 2025	First 10% IEEPA tariff on Chinese imports takes effect
February 2025 – February 2026	Class period pleaded in the Amazon actions
20 February 2026	Supreme Court decides Learning Resources, Inc. v. Trump; IEEPA tariffs invalidated
March 2026	First consumer tariff class actions filed, including against Temu and Shein in Cook County
15 May 2026	Markland v. Amazon.com filed in the Western District of Washington
18 May 2026	Costco moves to dismiss Stockov on ripeness grounds
29 June 2026	Amazon actions consolidated in the Western District of Washington
21 July 2026	Nintendo moves to dismiss or, alternatively, to compel arbitration
30 July 2026	Amazon reports roughly $600m in tariff refunds received
1 August 2026	MDL No. 3197 centralization motion filed
14 August 2026	Amazon reinstates its consumer arbitration clause; MDL No. 3202 motion filed
10–11 September 2026	Joint defense and separate Costco oppositions filed with the Panel
24 September 2026	JPML oral argument, Chicago

How many tariff refund class actions have been filed?

Holland & Knight's August 2026 update counted roughly 100 consumer class actions across nearly 30 federal districts, with new complaints arriving weekly. Its sector breakdown put about 60% against retail, consumer brands and manufacturers, about 17% against shipping and logistics, and about 17% against distributors and marketplace retailers. The Open Class Actions tracker, which is more selective, listed 21 cases across 15 courts in September 2026 and recorded all of them as still at the complaint stage.

Both counts matter for different reasons. The larger figure explains why the Panel is being asked to intervene at all. The smaller one explains why the defense oppositions have force: no court has yet ruled on the core pass-through theory, so the Panel is being asked to centralize a litigation whose viability is entirely untested. Centralizing 26 cases that a single Rule 12 ruling might dispose of is the argument Costco made explicitly, and it is the argument the Panel will have to weigh against the prospect of thirty districts reaching thirty answers.

Why is Nintendo trying to send its tariff class action to arbitration?

Because it can, and because the alternative is a class action it would have to defeat on a question no court has answered.

The Nintendo complaint, filed in April 2026 in the Western District of Washington by plaintiffs Hoffert and Sharan, alleges the company raised prices on console hardware and accessories in response to the tariffs and then positioned itself to recover the duties. On 21 July 2026 Nintendo filed a motion to dismiss and, in the alternative, a Motion to Compel Arbitration. Its substantive position is that the price increases were modest and selective, that it absorbed tariff costs on some products, and that customers received exactly what they bargained and paid for. Its procedural position is the more consequential one: the lead plaintiff agreed to arbitrate twice, and both agreements contain a Delegation Clause sending questions about the scope of the agreement to the arbitrator rather than the court.

That is the standard architecture after Henry Schein and Rent-A-Center, and it is why the delegation point is doing more work here than the underlying Class Action Waiver. If the delegation provision is enforced, the court never reaches whether a tariff overcharge claim falls within a video game company's terms of service. An arbitrator does. Gateway Questions of that kind are precisely what the clause is drafted to remove from judicial hands, and a plaintiff who wants a court to answer them has to attack the delegation provision specifically rather than the agreement as a whole.

No ruling had issued as of mid-September 2026. When it comes, it will be the first substantial decision on whether the standard consumer arbitration clause reaches a pricing claim of this shape, and every defendant in the wave with a comparable clause will read it the same week.

Does Amazon's arbitration clause cover tariff refund claims?

This is the question with the most interesting answer, and no competitor page addresses it.

Amazon removed binding arbitration from its consumer Conditions of Use on 3 May 2021, after roughly 75,000 individual demands were filed on behalf of Echo device users and the Filing Fee exposure alone ran into tens of millions of dollars before a single claim was adjudicated. For five years, Amazon customer disputes went to state or federal court in King County, Washington. That is the regime under which the tariff class actions were filed, and it is why Markland and Rosen are in a district court at all rather than in front of a provider.

On 14 August 2026 Amazon reinstated arbitration, together with a Class Action Waiver and an escalating Batching structure designed specifically to blunt Mass Arbitration: a Mass Filing Threshold of 25 or more demands within six months brought by the same or coordinated counsel, batch sizes rising to 100 above 500 demands and to 500 above 2,500, JAMS appeal rights on every batch, and a first-of-its-kind obligation on both sides to disclose Third-Party Litigation Funding agreements. We covered that rewrite when it landed.

The timing is the point. The clause returned six months after the class period closed and three months after the lead tariff complaints were filed. Amazon's own filings in the centralization fight do not rely on arbitration, and the Panel is being asked to centralize court cases, not to allocate claims between forums. A new clause generally binds future disputes; applying it to an already-filed claim by an already-named plaintiff is a different and much harder argument, and one that courts have treated with suspicion when the rollout post-dates the litigation. Readers following that doctrine will recognize the shape of it from the Eastern District of New York's order this month barring a defendant from circulating a dispute resolution agreement to settlement class members mid-case.

So the practical answer is that Amazon's new clause is unlikely to touch the pending tariff cases and very likely to govern the next wave of them. Any consumer who bought on Amazon after 14 August 2026 and later develops a pricing claim is a claimant in arbitration, subject to batching, not a member of a class.

Is there a Nintendo tariff mass arbitration?

There is a campaign to build one. Class Action U, a claim aggregator, is recruiting consumers who bought Nintendo products directly from the company between April 2025 and February 2026, on the same factual premise as the class action: that the price increases embedded tariffs that the Supreme Court later invalidated. The solicitation describes a Mass Arbitration strategy on behalf of more than 10,000 consumers.

This is the detail that inverts the usual analysis. Every defense alert in this space treats an arbitration clause as a way to make a class action disappear. On the facts of this wave it may instead be the mechanism that converts a single class action into ten thousand individually docketed demands, each carrying provider fees, each requiring an answer, none of them capable of being resolved by one Rule 12 ruling. A Negative-Value Claim — an $80 console price increase, a $12 overcharge on an adapter — is worthless individually and formidable in aggregate, which is the entire economics of mass arbitration and has been since the Amazon Echo filings.

That does not mean arbitration is a trap for every defendant. A company whose clause carries a modern batching regime, a staged fee structure and a bellwether mechanism is in a far better position than one whose clause is a bare 2019-vintage agreement incorporating provider rules by reference and paying per-case fees on every demand. The distinction between those two drafting postures is now worth more, in this litigation, than any merits argument.

The defense menu, and which defenses are forum questions

Defendants are raising a consistent set of objections. What is less often noticed is that they divide cleanly into defenses a court decides, defenses an arbitrator may decide, and defenses that determine which of the two is asking.

Defense	What it argues	Who decides
Arbitration and delegation	The claim belongs in individual arbitration; scope is for the arbitrator	Court decides enforceability; arbitrator decides scope where a delegation clause holds
Ripeness	No refund has yet been received, so no overcharge has been retained	Court
Standing and injury	The consumer paid a posted price for a product freely chosen	Court
Voluntary payment doctrine	A price paid with knowledge of the charge is not recoverable	Court or arbitrator, depending on forum
No contractual duty to rebate	Nothing in the sale promised to pass duties back	Court or arbitrator
IEEPA good-faith reliance	Pricing set in reliance on then-valid government orders is protected	Court or arbitrator
Predominance under Rule 23	Pricing varied by SKU, period and channel, so individual issues dominate	Court only; unavailable in arbitration

The last row is the one that ought to shape defense strategy and frequently does not. Predominance is a defendant's strongest weapon against a tariff pass-through class, because pricing genuinely did vary item by item and week by week. It exists only in court. A defendant that successfully compels arbitration wins the forum fight and simultaneously gives up the argument most likely to end the litigation outright — while inheriting whatever aggregation pressure the claimants' side can generate on the other side of the door.

What it means for retailers, claimants' counsel and mass arbitration practice

For retailers and consumer brands, the audit is narrow and urgent: identify which customer cohorts were subject to an arbitration clause during the class period, not today. A clause adopted or amended in 2026 is close to irrelevant to a 2025 purchase, and treating a current terms page as though it governed a historical transaction is the most common error in this litigation. The second question is whether the clause, if it does apply, has a batching regime, a staged fee schedule and an informal resolution period, or whether it is an unmodernized agreement that prices every demand at full provider rates.

For claimants' counsel, the arithmetic is unusually legible. Where the clause does not reach the class period, the court track is open and a tariff refund MDL would consolidate the work. Where the clause does reach it, the aggregate claim does not disappear; it changes shape, and the Nintendo campaign is the template. Claim Aggregation against a defendant with an old clause remains the highest-leverage posture in consumer practice, and the tariff facts are close to ideal for it: a defined class period, a public pricing signal, a documented refund on the other side, and purchase records the consumer already holds.

For mass arbitration practice generally, this wave is the first large-scale test of whether the 2024-to-2026 generation of defense clauses actually performs. Those clauses were written against privacy and device claims. They are about to be applied to a pricing claim with a hard start date, a hard end date, and a refund figure a defendant has already disclosed. The doctrinal question is unchanged — whether the agreement is enforceable, whether the Delegation Clause survives, whether the batching schedule is fair enough to escape Unconscionability. The economics are not: this is the first mass arbitration exposure in which the size of the underlying claim can be computed from a public number.

For everyone, the near-term calendar is short. The Panel rules on centralization within days or weeks of the 24 September argument. The first merits ruling on the pass-through theory could arrive from any of thirty districts. And the first decision on whether a consumer arbitration clause reaches a tariff overcharge claim will come out of Seattle.

Frequently asked questions

Can consumers sue a retailer for a tariff refund?

They are trying, in roughly 100 putative class actions, on the theory that a company which priced an invalidated tariff into its shelf prices and then collects a refund from the government has been paid twice. No court has yet ruled on whether that theory states a claim.

Who gets the IEEPA tariff refunds, importers or consumers?

Importers of record. Refunds are processed to the party that paid the duty at entry, through CBP's refund system or the Court of International Trade. Consumers have no direct claim against the government, which is precisely why they are suing retailers instead.

What did the Supreme Court actually decide about the tariffs?

In Learning Resources, Inc. v. Trump, decided 20 February 2026 by a 6-3 vote, the Court held that IEEPA does not authorize the President to impose tariffs. It did not decide who is entitled to the money already collected, and it said nothing about consumer pricing.

Will the JPML create a tariff refund MDL on 24 September 2026?

The Panel hears argument that day on MDL No. 3197 and typically rules within days to a few weeks. A single-defendant Amazon docket is the more conventional request; the 26-case cross-industry petition asks the Panel to treat independent pricing decisions as a shared question of fact, which it declined to do in a comparable multi-manufacturer petition in June 2026.

Does an arbitration clause end a tariff refund claim?

It changes the forum, not the claim. A clause in force during the purchase period can move the dispute into individual arbitration and defeat class treatment. It also exposes the company to mass arbitration, which is already being organized against at least one defendant in this wave, and it forfeits the Rule 23 predominance argument that is the strongest defense to a pricing class.

Which defendants have already tested these defenses?

Nintendo moved to dismiss or compel arbitration on 21 July 2026; Costco moved to dismiss on ripeness grounds on 18 May 2026. Neither motion had been decided as of mid-September 2026, which is the single most important fact about this litigation: it is entirely unadjudicated.