Nonrenewal does not start the six-month withdrawal clock. Article 34.6 starts that clock only when a Party gives written notice of withdrawal, and the 2026 review did not itself supply such a notice. What the review did was operate Article 34.7. That review ran on the record, through a public comment period and hearing USTR opened in September 2025, and closed as a nonrenewal rather than a notice. The compliance risk comes from collapsing two mechanisms that the agreement keeps separate, and an importer that plans around the wrong one will misjudge both the timeline and the legal exposure.
The two mechanisms the agreement keeps separate
Article 34.7 governs the term of the agreement and the joint review. USMCA runs for sixteen years unless the Parties confirm an extension. At the six-year mark the Parties conduct a joint review and each decides whether to confirm the agreement for a further sixteen-year term. If a Party does not confirm, the agreement does not end. The Commission must instead conduct a joint review every year for the remainder of the term, and the Parties retain the ability to confirm an extension during those annual reviews. A decision against confirmation is a decision to keep reviewing rather than a decision to leave. The legal consequence of the 2026 review follows from that text. When a Party does not confirm extension, the annual review cycle begins and the sixteen-year clock keeps running unless and until the Parties later confirm.
Article 34.6 governs withdrawal, and it operates on entirely different terms. A Party may withdraw by providing written notice of withdrawal to the other Parties, and the withdrawal takes effect six months after that notice unless the Parties agree otherwise. The agreement remains in force for the Parties that have not withdrawn. Nothing in Article 34.7 feeds into Article 34.6. Declining to confirm a longer term does not constitute notice of withdrawal, does not shorten the sixteen-year term, and does not start the six-month clock. If the United States wants to leave before the term expires, it has to give the Article 34.6 notice, and giving that notice is a separate act with a separate and contested legal foundation.
A trade team has to hold these two provisions apart, because the rest of the analysis changes depending on which one is in play. The annual review path is stable and predictable. The withdrawal path opens a set of unresolved questions about who inside the United States government holds the authority to act, and about what a notice would and would not accomplish on its own.
The two authority theories in play
Assume for the sake of analysis that an administration decides to send an Article 34.6 notice. The immediate domestic question is where the authority to do that comes from, and here the government has taken positions over time that are hard to reconcile.
The first is the executive branch view. CRS describes the 2018 Office of Legal Counsel NAFTA memorandum as taking the position that the President could withdraw from NAFTA without further legislative action. That view treats the power to terminate international agreements as an executive function and treats the withdrawal notice as an act on the international plane rather than a change to domestic law. It is an executive branch position rather than a judicial rule. A narrower version of the executive branch argument is that an Article 34.6 notice acts on the international plane, while domestic legal changes must rest on statutory authority. On that framing a President could send the notice and let the domestic statute run its own course.
The second is the congressional consent view, stated directly by the Senate Finance Committee in its 2020 report accompanying the USMCA implementing legislation. That report took the position that the United States cannot withdraw from a congressionally approved trade agreement without the consent of Congress. This is the committee report position and not controlling law, but it is a direct statement from the committee of jurisdiction. The reasoning tracks the character of the instrument. USMCA is a congressional-executive agreement, approved and implemented by statute rather than ratified as a treaty under the Article Two process, and on this view an agreement that Congress brought into force by legislation cannot be unwound by the executive acting alone.
These are not two framings of the same rule. They are competing answers to a question that has never been resolved by a court. The Congressional Research Service, examining presidential authority to withdraw from agreements of this kind, has described the domestic law question as contested and uncertain and has noted that judicial precedent directly on point is scarce. The defensible reading is that the international notice mechanism is clear while the domestic authority to invoke it is genuinely open. An analysis that tells importers the President can withdraw at will, or that tells them Congress can always block it, is claiming a certainty that the sources do not support.
Why Section 125 does not settle it
Section 125 of the Trade Act of 1974, codified at 19 U.S.C. 2135, is the statute an administration would most likely reach for, and it is worth being precise about what it does and does not supply. Section 125 addresses the termination and withdrawal of trade agreements and the handling of the tariff consequences that follow. It contemplates that trade agreements may be terminated or withdrawn from, it addresses the treatment of proclaimed duties and other measures after a termination, and it gives the President tools to manage the tariff transition, including authority tied to proclamations that carried out the agreement in the first place.
What Section 125 does not do is expressly answer which branch decides that the United States will withdraw. In the NAFTA context, the Congressional Research Service treated the scope of presidential authority under Section 125(a), and whether it delegates a freestanding withdrawal decision to the President, as an issue of first impression that courts have not resolved. The same statutory gap matters in the USMCA setting, because Section 125 still speaks more clearly to tariff consequences than to the domestic decision to withdraw. Section 125 is a strong hook for the tariff mechanics of a withdrawal, the part that governs what happens to duty rates and proclaimed preferences once an agreement is no longer in force. It is a much weaker foundation for the prior and more contested proposition that the President may decide, without Congress, that the country is leaving.
Section 125 also carries a transition rule that matters directly to duty modeling. Under Section 125(e), preferential duty rates for products of a former free trade agreement partner continue for one year after a United States termination or withdrawal unless the President restores nonagreement rates by proclamation. That one-year continuation means preference does not necessarily vanish the moment a withdrawal takes effect, and it gives the executive a proclamation lever over the timing and the rate. For a trade team the practical takeaway is to read Section 125 as the tariff consequence provision rather than the withdrawal decision provision. If an administration invokes Section 125, the citation tells you how it intends to adjust duty treatment. It does not by itself resolve whether the withdrawal that triggers those adjustments was validly commenced.
What the Implementation Act controls
The international agreement and the domestic statute are two different things, and the domestic effect of USMCA inside the United States is controlled by the USMCA Implementation Act rather than by the agreement text. That statute does several things that matter to a withdrawal scenario. It approves the agreement. Through Section 102 it makes federal law controlling in the event of a conflict between the agreement and United States law, so that a provision of USMCA that conflicts with a federal statute has no domestic effect, and it forecloses private parties from bringing claims in United States courts based on USMCA itself. And it ties the life of most of its own operative provisions to the status of the agreement.
That last feature matters most for withdrawal analysis. The Implementation Act is built so that a large share of its implementing provisions switch off when USMCA ceases to be in force with respect to the United States. The termination trigger lives in the statute, at Section 621, and it keys the domestic sunset to the agreement no longer being in force for the United States rather than to any freestanding executive declaration. That design supports both arguments at once, which is why it sits at the center of the analysis.
On one hand it supports the executive branch argument that a President need not persuade Congress to repeal anything, because Congress already wrote the off switch and connected it to the status of the agreement. On the other hand it sharpens the congressional consent argument, because whether the agreement is in force with respect to the United States is precisely the question that a contested withdrawal notice puts in play. If the validity of the notice is itself disputed, then whether the statutory sunset has been triggered is disputed along with it. The statute does not resolve the authority question. It relocates it to when the agreement is no longer in force, and that question leads back to the unresolved authority issue.
The tariff delegation backdrop
Learning Resources v. Trump does not decide FTA withdrawal. Decided on February 20, 2026, it matters here because the Court held that the International Emergency Economic Powers Act does not authorize the imposition of tariffs, and because the principal opinion treated clear congressional authorization as necessary for the tariff power asserted there. In the course of that ruling the Court also addressed the jurisdictional channel for tariff disputes. That makes the case a tariff delegation caution rather than a withdrawal holding, and it bears on a withdrawal analysis in one narrow and directional way. The principal opinion declined to infer a sweeping duty-setting authority from a statute that did not plainly confer one.
That posture is a signal rather than a holding on the withdrawal question. An administration relying on general or implied authority to change duty treatment after a withdrawal would be arguing in an environment where the principal opinion looked for an unambiguous statutory basis before accepting a novel tariff theory. Learning Resources is a caution about how far implied delegations stretch in the tariff setting. Reading it as governing the withdrawal question overstates it.
Where a challenge would land
If a withdrawal notice issued and an administration moved to change duty treatment, the litigation would probably split along the same line as the rest of this analysis. One track concerns the tariff consequences, the change in duty rates and the loss of preference on covered goods. The other concerns the validity of the notice itself as a matter of the government's internal authority to send it.
The tariff track has a relatively clear home. Under 28 U.S.C. 1581, the Court of International Trade has jurisdiction over protest denials and civil actions arising out of laws providing for tariffs, duties, fees, or the administration and enforcement of those measures, and Learning Resources confirmed that channel for tariff disputes. An importer that pays a higher duty because preference has been withdrawn presents the cleanest injury theory available, because the duty payment is a direct and quantifiable economic harm, and an importer challenge to a withdrawal-driven duty change would most naturally begin at the Court of International Trade. No court has decided importer standing on these facts, so the structure of tariff litigation supplies a likely posture rather than a guarantee.
The track that attacks the notice itself is harder. A suit aimed at the government's authority to withdraw, as opposed to the resulting duty change, would run into ripeness questions before the notice produced concrete effects and into political question defenses about the allocation of foreign affairs authority between the branches. Those are the same defenses that have historically made direct challenges to withdrawal decisions difficult to sustain, which is part of why the underlying authority question has stayed unresolved. The practical consequence is that the cleaner and more likely vehicle for testing a withdrawal is a tariff refund posture brought by an importer after duties change, rather than a preemptive challenge to the notice.
Why this is new
The current record answers the threshold question. The 2026 review did not start the Article 34.6 clock. This analysis takes up the question that sits behind that one. If and when a Party moves to start the clock, who inside the United States government holds the authority to do it, and what does the notice actually accomplish on its own.
What makes the question live now is that three developments have converged. The review has moved USMCA into annual reviews, which keeps the term open and keeps the option of a mid-term exit on the table for the full remaining period rather than confining the decision to a single review moment. The domestic sunset mechanism in the Implementation Act ties the fate of the operative provisions to a status question, whether the agreement is in force for the United States, that a contested notice would itself throw into dispute. And in the tariff context the Court held that the International Emergency Economic Powers Act does not authorize tariffs, while the principal opinion required clear congressional authorization for the tariff power asserted there, which leaves implied tariff authority a weaker foundation for post-withdrawal duty changes. None of these on its own is new. Together they turn a mostly academic separation of powers debate into a set of concrete questions about duty exposure and refund posture that a trade team has to be able to model.
What importers and trade teams should do
Waiting for a withdrawal that may never come is the wrong posture. The better course is to build the entry posture now, so a notice, if it issues, does not catch the compliance function unprepared.
Reconfirm origin on the goods that actually depend on USMCA preference rather than assuming current preference claims remain valid. For products qualifying under USMCA rules of origin, identify which lines would move from a USMCA preferential rate to the Column 1 general rate if preference were withdrawn, and quantify the duty delta on actual entry volume rather than on a representative SKU. The exposure that matters is the duty difference on the entries a company will actually file during a six-month notice window and afterward.
Model two tariff cases rather than assuming preference disappears at once. One case assumes a proclaimed restoration of nonpreferential rates that takes effect when the withdrawal does. The other assumes the Section 125(e) one-year continuation keeps carryout duty treatment in place unless a proclamation changes that treatment sooner. The duty exposure and the timing differ between the two, and a trade team that models only the immediate loss of preference will misstate both the cost and the window in which it lands.
Model the duty stack under a withdrawal scenario rather than treating USMCA preference in isolation. A line that loses USMCA treatment may sit under other import measures at the same time, and the interaction of a preference loss with those measures determines the true landed cost. Map which lines would move and by how much, and flag the ones where a preference loss stacks on top of another measure.
Preserve refund optionality by watching liquidation status on entries filed during any period of legal uncertainty. To preserve refund optionality, importers should track liquidation and protest windows on entries affected by any withdrawal-driven duty change, because refund posture usually turns on whether the entry remains legally contestable. If duty treatment changes on a contested legal basis and that basis is later rejected, the refund path runs through entries that have not finally liquidated. Under 19 U.S.C. 1514, a liquidation that is not protested within the statutory window becomes final, so entries that liquidate and go unprotested are much harder to recover against later.
Identify the instrument rather than the headline. The operative question when a withdrawal moves is what legal instrument the administration uses to change duty treatment, a proclamation, a Federal Register notice, or a CBP implementing instruction, rather than what a statement says. The instrument is what a court reviews and what a broker has to apply, and it is the thing a compliance function needs in hand to adjust entry filing.
What would change the calculus
The authority question is unresolved today, but several observable developments would move it, and a monitoring posture should watch for the specific instruments rather than for commentary.
A written Article 34.6 notice, in whatever form it takes, is the event that converts the analysis from contingent to active. Its form matters. Whether it is styled as a presidential act, a USTR transmittal, or a diplomatic communication will shape which authority theory the administration is relying on and which defenses a challenger can raise.
The statutory citation an administration attaches to any duty change would signal how it is threading the Section 125 gap. A reliance on Section 125 for the tariff mechanics, paired with a separate and explicit claim of authority for the withdrawal decision itself, would tell you the government sees the two questions as distinct. A single undifferentiated citation would tell you it is betting that Section 125 carries both, which is the weaker position.
Any congressional action would matter regardless of which chamber acts. A resolution asserting that consent is required, appropriations language, or legislation addressing the Implementation Act sunset would each bear directly on the congressional consent theory and on how a court weighs the separation of powers question. The committee posture is already moving. On the day of the review outcome, the House Ways and Means chair set conditions for any future agreement. That statement addresses renegotiation terms rather than withdrawal consent, but it signals that the committees of jurisdiction expect a role in what follows.
The forum in which the first challenge is filed, and the theory it advances, would shape the whole trajectory. A tariff refund suit at the Court of International Trade brought by an importer after duties change is a different vehicle, with different ripeness and standing dynamics, than a preemptive challenge to the notice. The first case to reach a merits ruling on the authority question would be the one to watch, because there is no controlling precedent for it to follow.
Caveats
The 2026 review is treated here as a nonrenewal that operates Article 34.7 and does not itself constitute an Article 34.6 withdrawal notice. USTR has officially stated that the United States did not agree to renew USMCA in its current form and that the agreement remains in force. Later reported official characterizations should not be used unless tied to an official instrument. The nonrenewal characterization rests on the agreement text and on the USTR statement, and it would need to be revisited if a subsequent instrument recharacterized the review outcome.
The authority question is presented as unresolved by design. The executive branch view and the congressional consent view are both stated as positions rather than as controlling law, because there is no judicial ruling directly resolving whether a President may withdraw the United States from a congressional-executive trade agreement without Congress. The Senate Finance Committee statement is a committee report position rather than a holding. Any discussion of how a court might rule describes likely litigation posture rather than a predicted outcome.
The Section 125(e) one-year continuation is stated as the transition rule for products of a former free trade agreement partner. The litigation section identifies the Court of International Trade as the likely forum for tariff administration disputes based on 28 U.S.C. 1581 and the recent Supreme Court treatment of that channel. The importer standing point, the liquidation and protest points, and the difficulty of a direct challenge to the notice are risk-management conclusions drawn from the structure of trade and customs litigation rather than holdings on these specific facts.