The Supreme Court’s decision rejecting IEEPA as a tariff statute is decisive on authority, but it is not self-executing on refunds. It shuts off the legal predicate for continued collection, yet it leaves a second and more operational question largely intact: how, and on what proof, will “unlawfully” collected duties be unwound across millions of entries.
The Supreme Court answered the authority question. The Court of International Trade (CIT) is now answering the remedial one. In Atmus Filtration v. United States, Judge Eaton issued a refund-oriented order that reads like the first operational blueprint: CBP is directed to liquidate unliquidated IEEPA entries without the IEEPA duties and to reliquidate non final liquidations on the same basis.
Final liquidations remain the hard-edge case:
That order does not make refunds automatic, but it materially reduces uncertainty about which entries are most recoverable and how repayment is likely to be operationalized.
Two things can be true at once:
Customs law is built around the entry. Each entry has its own duty calculation, its own liquidation clock, and its own administrative posture. Even where illegality is clear, repayment is operationalized through liquidation or reliquidation, and the payment flows from a recalculated entry record.
For importers, this means the refund landscape is not a single consolidated balance sheet entry. It is a large set of heterogeneous entries across ports, brokers, and importer of record structures, many filed under urgent operational conditions and with uneven documentation.
One structural constraint looms over any refund architecture: finality. Under 19 U.S.C. §1514, a liquidation becomes “final and conclusive upon all persons” unless a protest is filed within 180 days of liquidation. That doctrine is not procedural trivia; it is the backbone of customs administration. The government is therefore likely to argue that entries liquidated without timely protest are not automatically reopened simply because the underlying tariff authority has been invalidated. Instead, it may contend that relief is limited to unliquidated entries, entries still within the protest window, or entries covered by specific court-ordered remedial instructions.
This finality framework is the single most significant legal limiter on the scope of recoverable refunds and will shape both the breadth of any CIT remedy and the practical recoverability profile across importer portfolios. The CIT is already translating that doctrine into remedies. In the 4 March Atmus ruling, Judge Eaton directed liquidation and reliquidation only where an entry is unliquidated or where liquidation is not yet final.
In practice, importers should plan around four pathways, each with different friction points. After Atmus Filtration, the court-ordered track is no longer speculative; it is emerging as the organizing framework that the other pathways must fit into.
Refund entitlement generally follows the importer of record, not the party that bore the economic incidence. This divergence will drive the second wave of disputes. Under DDP and similar structures, a foreign seller may be the importer of record (IOR). In other cases, a U.S. subsidiary, nominee, or logistics intermediary served as importer of record for operational reasons.
The implication is straightforward: a firm can be economically out-of-pocket and still not be the party positioned to receive a refund. Where contracts are silent on refund allocation, expect disputes that are factual, document-heavy, and slow.
The winning posture is administrative discipline. Treat the refund cycle as a documentation contest with deadlines.
Finally, keep an eye on litigation posture and the emerging market in refund rights. A large number of importers are already filing at the CIT to preserve claims, and a secondary market for refund rights has accelerated since the decision.
The strongest reason to be optimistic is that the mechanics exist. If CBP reliquidates, §1505 provides a clear payment obligation, including interest, and a 30-day repayment clock.
Atmus Filtration is a reason for guarded confidence on mechanics for non-final entries, because it shows the CIT is prepared to give CBP a clear, administrable instruction set rather than leaving importers to litigate entry by entry.
The strongest reason to be cautious is that the Supreme Court did not dictate a refund remedy. That gives the government room to argue for narrower relief and forces the CIT to design a refund architecture that respects finality while giving practical effect to the holding.
For firms with meaningful exposure, the best strategy is to behave as if refunds are recoverable, but only after you prove entitlement with entry-level precision and fit within the remedial rules that will now emerge.
