USTR’s Section 301 investigation into manufacturing overcapacity across 16 economies enters its decisive phase, with Greer signalling that current tariff levels are not the ceiling
WASHINGTON, Nov. 6, 2026 – The largest unresolved item on the United States trade agenda is not a tariff that has been imposed. It is a set of determinations that has not yet been made.
United States Trade Representative Jamieson Greer said this week that recommendations arising from the Section 301 investigations into structural excess capacity and production in manufacturing sectors will be delivered by the end of 2026, and in any event before the statutory deadline in March 2027. Asked whether existing duties represented the limit of the administration’s ambitions, he said he doubted that current tariffs are “as high as they will go,” language that trade counsel across Washington read as a signal that the overcapacity track is intended to raise rates rather than rationalize them.
The investigations, opened on March 11, 2026, cover roughly 21 manufacturing sectors across 16 economies. They were conceived in the weeks after the Supreme Court removed the administration’s emergency tariff authority, and they are the mechanism through which the broad-based tariff structure built under the International Emergency Economic Powers Act is being rebuilt on firmer statutory ground. Their outcome will set the baseline landed cost of imported manufactured goods in the United States for the remainder of the decade.
For importers, the window to influence that outcome is closing. For exporters in the covered economies, the window to prepare for it already has.
The scope
The 16 economies under investigation span four regions. In East Asia: China, Japan, South Korea and Taiwan. In Southeast Asia: Singapore, Indonesia, Malaysia, Cambodia, Thailand and Vietnam. In South Asia: India and Bangladesh. In Europe: the member states of the European Union, together with Switzerland and Norway. In North America: Mexico.
The sector list is wider still. It covers metals, including aluminum, steel and non-ferrous metals. It covers materials, including cement, chemicals, glass, paper and plastics. It covers vehicles and transport, including automobiles, ships and transportation equipment more generally. It covers energy and electronics, including batteries, solar modules, semiconductors, electronic goods and energy products. It covers machinery and technology, including machine tools, general machinery, robotics and satellites. And it covers processed food and beverages.
Taken together, the scope reaches a very large share of American manufactured imports. The inclusion of Mexico is particularly striking given the USMCA framework, and the inclusion of Switzerland, Norway, Japan and South Korea makes clear that this is not a China action with incidental coverage of others. It is a general instrument.
The legal basis is Section 301(b) of the Trade Act of 1974, the discretionary limb of the statute, which applies where a foreign economy’s acts, policies or practices are unreasonable or discriminatory and burden or restrict United States commerce. The available remedies are duties or other import restrictions, the withdrawal or suspension of trade agreement concessions, or a binding agreement with the foreign government. The statutory time limit is twelve months from initiation, which places the outer deadline in March 2027. Following an affirmative determination, USTR must act within 30 days, subject to extension, and in practice normally runs a further comment period on proposed remedies before doing so.
How the process has run
The public docket opened on March 17, 2026. Written comments and hearing requests were due by 11:59 p.m. on April 15. Public hearings ran in Washington from May 5 to May 8, with rebuttal comments due seven calendar days after the final hearing day. USTR and the President had indicated an unofficial target of July 24, 2026 for completing the investigations and reaching remedy decisions.
That target was missed, and the slippage is itself informative. Greer’s revised guidance of “end of 2026, and in any event before March 2027” suggests an agency working through a volume of sector-specific record material that is considerably larger than the forced-labor investigations it ran in parallel.
Those forced-labor proceedings offer the closest available template. USTR initiated investigations covering roughly 60 economies into the failure to impose and effectively enforce a prohibition on the importation of goods produced with forced labor, proposed action in early June 2026, and finalized duties of 10 percent or 12.5 percent effective July 24, 2026. The pattern was a broad investigation, a modest headline rate, and very wide country coverage.
If the overcapacity track follows the same template, the market should expect duties in the low double digits applied across a long list of sector and origin combinations, rather than dramatic rates applied narrowly. If it does not, and Greer’s comment about current rates not being a ceiling points toward something more aggressive, the effect on landed costs would be materially larger.
Brookings analysts have argued through the year that public input matters more in these proceedings than in most, precisely because Section 301(b) gives USTR unusually wide discretion over both the determination and the remedy. Companies that filed detailed submissions and appeared at the May hearings have a record to point to. Those that did not will be arguing from a weaker position during the remedy comment period.
What overcapacity means as a legal theory
The intellectual framework behind the investigation deserves scrutiny, because it is novel and because its breadth is the source of both its power and its vulnerability.
The traditional Section 301 case alleges a specific foreign practice: inadequate intellectual property protection, a discriminatory licensing requirement, a digital services tax aimed at American firms. The overcapacity theory is different. It alleges that a foreign economy has systematically supported production capacity beyond what its domestic market can absorb, with the result that surplus output is exported at prices that burden United States commerce.
That theory has an obvious application to Chinese steel, aluminum, solar and battery capacity, where the evidence of state-directed investment is extensive and well documented in prior proceedings. Its application to Switzerland, Norway or Singapore is less intuitive, and respondents in those economies have pressed the point in their submissions.
The theory also sits uneasily beside the antidumping and countervailing duty system, which exists precisely to address subsidized or below-cost imports on a product-specific, injury-tested basis. A Section 301 remedy requires no injury determination by the International Trade Commission and no company-specific dumping margin. It is faster and broader, and it is therefore more exposed to the argument that it circumvents the procedural protections Congress built into the trade remedy laws.
Whether that argument finds a receptive court is an open question. The Supreme Court’s reasoning in Learning Resources, Inc. v. Trump on Feb. 20, 2026 turned on the absence of any clear delegation of tariff authority in the International Emergency Economic Powers Act. Section 301 contains such a delegation explicitly. The statute names duties as a remedy. That is a meaningfully stronger position than the one the administration occupied in February, and it is why the overcapacity track exists in this form.
Where rates stand before the remedy
The practical significance of the coming determination depends on what it is added to.
Modelled applied-rate estimates for United States imports as of Nov. 6, 2026 show the trade-weighted average rate on goods from South Korea at 12.99 percent, across 5,683 product flows covering roughly 131 billion dollars of trade. Some 76.1 percent of those flows sit in the 5 to 15 percent band, with 4.2 percent between 30 and 50 percent and a further 1.5 percent above 50 percent.
Japan shows a trade-weighted average of 12.80 percent across approximately 147 billion dollars, with 74.1 percent of flows in the 5 to 15 percent band. Germany shows 10.90 percent across about 159 billion dollars, with 72.5 percent of flows in the same band but a maximum modelled line rate of 350 percent, reflecting the specialty pharmaceutical tariff structure that took effect during 2026.
China sits in a different category entirely, with a trade-weighted average of 24.68 percent, a simple average of 36.52 percent, and 67.7 percent of flows carrying modelled rates above 30 percent.
These are modelled estimates rather than official schedules, and they are sensitive to exclusions and to compliance weighting. But they establish the arithmetic that matters. An additional overcapacity duty of 10 to 12.5 percent, applied on the forced-labor template, would push the effective rate on Korean, Japanese and German manufactured goods from roughly 11 to 13 percent toward the low to mid twenties. For products already carrying Section 232 metals or pharmaceutical duties, the stacking would push higher still.
That is a substantial repricing of allied manufactured trade, and it would arrive on top of a tariff structure that already includes the Section 301 forced-labor duties imposed in July.
Reactions
Reaction within the business community has been divided along predictable lines, but with less unanimity than earlier rounds produced.
Domestic producers in steel, aluminum, solar and battery manufacturing have supported the investigation, arguing that persistent global overcapacity depresses prices below any level at which American capacity can be financed, and that product-by-product antidumping cases are too slow to address a problem that migrates across tariff lines faster than petitions can be filed.
Downstream manufacturers and importers have opposed it on the ground that it taxes inputs, that it applies to allied economies with no plausible subsidy case, and that the absence of an injury test removes the discipline that keeps trade remedies tethered to demonstrated harm.
Foreign governments have responded through a mix of diplomatic engagement and parallel action. Japan has pledged 550 billion dollars in United States investment and South Korea 350 billion dollars, commitments that are plainly intended in part to purchase tariff forbearance. The European Union continues to dispute digital services taxation and approximately 3 billion euros, around 3.4 billion dollars, in public loans to Airbus, both of which complicate any negotiated landing.
Meanwhile the trade-remedy traffic running the other way has picked up. South Korea opened an antidumping investigation on Nov. 5, 2026 into 2-ethylhexyl acrylate from China, Malaysia and the United States. The European Union initiated a safeguard investigation into certain polyethylene terephthalate resin chemicals on Nov. 6, and has a proceeding underway on acrylic esters from China, Saudi Arabia, South Africa and the United States. These are not formal retaliation, and should not be reported as such. They are the ordinary machinery of trade defense being used more actively in an environment where everybody’s margins are under pressure.
Sector by sector, where the exposure concentrates
The 21 sector groupings under investigation do not carry equal weight, and the record filed during the spring hearings gives a reasonable guide to where the remedies are most likely to bite.
Metals. Steel, aluminum and non-ferrous metals already carry Section 232 duties reaching 50 percent for listed articles and 25 percent for derivative products. An additional Section 301 overcapacity duty would stack. Domestic producers have filed the most detailed overcapacity evidence in these sectors, and the economic case is the most developed, but the marginal effect of a further duty on a product already at 50 percent is limited. The more consequential question in metals is derivative scope, where the Annex I-B list has expanded repeatedly during 2026.
Batteries and solar. This is where the overcapacity theory is strongest on the merits and the downstream cost most acute. Global cell and module capacity substantially exceeds demand, the surplus is concentrated in a small number of economies, and United States installers and vehicle manufacturers depend on imports for a large share of supply. A duty here raises the cost of the energy transition directly, which is why the submissions from utilities and developers were among the most forceful in the record.
Automobiles and transportation equipment. Section 232 duties on autos, trucks and parts are scheduled to rise to 50 percent on Jan. 1, 2027. Layering an overcapacity duty on top would produce rates that function as prohibitions on some lines. Japanese and Korean producers, with large United States assembly footprints, have argued that their American operations make them domestic manufacturers in substance.
Chemicals and plastics. These sectors are the quiet centre of the file. They supply almost everything else, they are traded in volume with every one of the 16 covered economies, and they are already the subject of an unusually active trade remedy exchange in both directions. The acrylic esters and acrylate proceedings opened against United States exporters this autumn illustrate how quickly a chemical line can become contested.
Semiconductors and electronics. The administration has moved carefully here, drawing the existing Section 232 semiconductor duty narrowly around certain advanced articles. The overcapacity theory applies most naturally to mature-node capacity rather than leading-edge, and the remedies are likely to reflect that distinction.
Machinery, machine tools and robotics. The Section 232 proceeding on robotics and industrial machinery concluded in October 2026 with no tariffs and a 180-day negotiation mandate. That outcome does not preclude a Section 301 overcapacity duty on the same goods, and the interaction between the two tracks is one of the least clear aspects of the current architecture.
Processed food and beverages. The inclusion of this grouping drew the most sceptical commentary during the hearings, since overcapacity in food processing is difficult to characterize as a structural distortion in the way steel capacity can be. It is the part of the scope most likely to be trimmed.
Lessons from the first Section 301 wave
The 2018 to 2019 Section 301 action against China provides the only large-scale precedent for administering duties of this breadth, and its administrative history is worth revisiting because the same problems are about to recur.
The exclusion process in that action was overwhelmed almost immediately. Tens of thousands of requests were filed, decisions took months, and the criteria applied were sufficiently opaque that similarly situated products received different outcomes. Exclusions were granted on a product basis rather than a requester basis, which created free-rider dynamics that discouraged small importers from investing in the filing. Several tranches of exclusions were allowed to lapse and then partially reinstated, leaving importers unable to plan.
Classification disputes multiplied, because a duty applied to a list of tariff lines creates an immediate incentive to argue that a product belongs on a different line. Customs enforcement activity rose accordingly, as did transshipment through third countries, which in turn generated country-of-origin investigations that are still working through the system.
All three dynamics should be expected again, at larger scale, because the covered trade is larger and the number of origins is sixteen rather than one. Importers who lived through the first wave will recognize the pattern. Those who entered the market more recently should assume that the administrative burden of a Section 301 action is a material cost in its own right, separate from the duty.
The one clear lesson is that preparation precedes the notice. Companies that had accurate tariff classification, documented country of origin and complete supplier records when the first action landed were able to file credible exclusion requests quickly. Companies that did not spent the first six months reconstructing their own data.
The political overlay
The investigation’s timetable now intersects with a changed Congress. Democrats won both chambers on Nov. 3, 2026 and will be seated in January 2027. Ron Wyden is the presumptive chair of Senate Finance and Richard Neal of House Ways and Means, though neither chairmanship is formally settled.
The new majorities cannot stop a Section 301 remedy. The statute vests the determination in USTR, and the arithmetic does not support a veto override. What they can do is conduct oversight at precisely the moment USTR is finalizing its proposals, which creates a real if limited incentive for the agency to land somewhere defensible.
There is also a timing question that trade counsel have begun to raise privately. A determination issued in December 2026, before the new Congress is seated, faces a different political environment than one issued in February or March 2027. Nothing in the statute requires USTR to wait.
Implications for importers and exporters
Importers in the covered sectors should treat the remedy comment period as the last meaningful opportunity to shape outcomes, and should be preparing submissions now rather than when the Federal Register notice appears. Submissions that quantify downstream employment, document the absence of domestic substitutes, and identify specific tariff lines where a duty would raise costs without supporting domestic capacity have historically been the most effective in Section 301 exclusion and scope decisions.
Landed-cost models should be rerun under at least three scenarios: no action, a 10 to 12.5 percent duty on the forced-labor template, and a higher rate consistent with Greer’s comments. Contracts with pricing terms extending into mid-2027 should be reviewed for tariff pass-through language, which in many agreements was drafted for the IEEPA environment and may not operate as intended against a Section 301 action.
Exporters in the 16 covered economies should assume coverage until told otherwise, and should recognize that the binding-agreement remedy available under Section 301 creates a negotiation channel that does not exist under Section 232. Governments that can offer credible capacity commitments have something to trade. Companies cannot negotiate on their own behalf, but they can supply their governments with the sector data that makes a credible offer possible.
For everyone, the planning calendar is unusually dense. The overcapacity determinations are due before March 2027. The robotics and wind turbine Section 232 negotiation reports are due roughly in April 2027. The USMCA joint review comment period closes on Jan. 12, 2027. The United States and China truce expires on Jan. 10, 2027. Section 232 duties on autos, trucks, parts and steel are scheduled to rise to 50 percent on Jan. 1, 2027.
Outlook
The Section 301 overcapacity action is the closest thing the administration has to a durable replacement for the tariff authority it lost in February. It is built on a statute that names duties explicitly, it covers most of the manufactured goods the United States imports, and it is being run by an agency whose head has publicly declined to describe current rates as a ceiling.
Importers who spent 2026 managing the unwinding of the IEEPA tariffs should understand that the refund process and the overcapacity process are running in opposite directions. Money is coming back from the regime the Supreme Court struck down. A new regime, on sounder legal footing, is being assembled to replace it.
The determination is due within four months. Most of the companies it will affect have not yet modelled it.