Section 301 Structural Excess Capacity Investigation: Which Countries and Sectors Are Under Review

A Section 301 structural excess capacity investigation asks whether a trading partner’s government keeps unused industrial capacity open, and whether that burdens U.S. commerce. The Office of the United States Trade Representative (USTR) opened investigations into 16 economies across 21 manufacturing sectors on March 11, 2026. It has issued no findings or additional tariffs so far.

All 16 of those economies already pay Section 301 forced labor tariffs, in force since July 24, 2026. A Section 301 charge on imported goods today therefore comes from that action, not the investigation covered here. A determination in the excess capacity case is due by March 11, 2027.

Below, we explain which countries and sectors are in scope, where the process stands, and how this investigation differs from the Section 301 forced labor tariffs.

What “Structural Excess Capacity” Means Under This Investigation

The Federal Register notice further defines structural excess capacity as “under-utilized industrial production capacity that is sustained through governmental interventions or policies incentivizing companies to maintain or grow their unused capacity inefficiently.” The named interventions include subsidies, wage suppression, and state-owned enterprise activity.

USTR’s accompanying fact sheet names the domestic effect. In many of these sectors, the United States has lost substantial production capacity or fallen behind foreign competitors.

In other words, the current USTR investigation seeks to identify industries where foreign governments promote persistent overproduction or trade surpluses that displace domestic U.S. production and investment.

How This Differs From Ordinary Cyclical Overcapacity

Manufacturing sectors run above and below demand all the time. Ordinary overcapacity is a demand slump, and it tends to correct itself as marginal producers close and capacity leaves the market.

USTR argues that government intervention interrupts that correction. Where policy keeps unprofitable capacity open, the adjustment never happens, and the surplus persists.

Section 301 requires USTR to identify a specific act, policy, or practice. The Congressional Research Service (CRS) noted in July 2026 that structural excess capacity can instead be seen as an outcome. CRS also noted that a court should assess whether the findings rest on sufficient evidence and a consistent methodology.

The question USTR must answer concerns government policy rather than demand, so companies tracking this case should watch USTR’s findings rather than market conditions.

Which Countries Are Under Investigation

The Federal Register notice names 16 economies:

China The European Union Singapore Switzerland Norway Indonesia

Malaysia Cambodia Thailand Korea Vietnam

Taiwan Bangladesh Mexico Japan India

Being named on this list does not immediately mean that all imported products will be tariffed. Section 301 actions apply to specific products, identified by tariff classification, from a specific economy. If USTR takes action here, it will name which products are covered for any given country.

Importers should confirm the country of origin for their goods with their customs broker. Origin depends on where a good or component was last substantially transformed, rather than where the final product shipped from.

These Economies Already Pay Different Section 301 Tariffs

Every economy under investigation here is also subject to the separate Section 301 forced labor tariffs.

Bangladesh, Cambodia, India, Indonesia, Malaysia, and Mexico pay 10%. China, Norway, Singapore, Thailand, and Vietnam pay 12.5%. For the European Union and Taiwan, the rate is 10% net of most-favored-nation (MFN) duty; for Japan, Korea, and Switzerland, it is 12.5% net of MFN duty.

The MFN tariff is the standard rate the United States applies where no preferential agreement or special measure applies. “Net of MFN” means USTR sets the Section 301 rate so that the two together reach the stated figure. Rates come from USTR’s notice of actions, published July 28, 2026 (91 FR 47318).

Which Manufacturing Sectors Are Named Under Structural Excess Capacity Investigations

The Federal Register notice names 21 manufacturing sectors:

Aluminum Automobiles Batteries Cement Chemicals Electronics Energy goods

Glass Machine tools Machinery Non-ferrous metals Paper Plastics Processed food & beverages

Robotics Satellites Semiconductors Ships Solar modules Steel Transportation equipment

Companies should match their own products to the named sectors using their Harmonized Tariff Schedule (HTS) classifications, which is the basis any action would use.

Investigation Timeline and Current Status

A Section 301 case runs through four stages. Our overview of Section 301 investigations explains how USTR runs these processes, and our guide to Section 301 explained covers the statute itself.

1. Initiation. USTR formally opens an investigation and publishes notice in the Federal Register. This investigation was initiated on March 11, 2026.
2. Comment period. Interested parties file written submissions to a public docket. The period for this investigation closed on April 15, 2026.
3. Hearing. USTR takes oral testimony and questions witnesses. The hearing ran from May 5 to 8, 2026.
4. Determination. USTR decides whether the acts, policies, or practices are actionable and, if so, what action to take. USTR has not yet reached this stage.

Companies tracking the case should monitor both the USTR dockets and the Federal Register, where any determination will be published.

March 11, 2026: Investigations Initiated

USTR announced these investigations and published its notice in the Federal Register on March 17, 2026 (91 FR 12886). Two dockets opened: USTR-2026-0067 for written comments and USTR-2026-0068 for requests to appear at the hearing. A docket is the public file where USTR collects submissions in a case.

USTR opened the investigations under Section 302(b)(1)(A) of the Trade Act of 1974, which allows USTR to start a case on its own initiative. It then applies the Section 301(b) standard: an act, policy, or practice is actionable if it is “unreasonable or discriminatory and burden[s] or restrict[s] U.S. commerce.” 

April 15, 2026: Public Comment Deadline

Written comments closed at 11:59 p.m. Eastern time on April 15, 2026.

May 5 to 8, 2026: Public Hearing

USTR held four days of hearings at the U.S. International Trade Commission (USITC) in Washington, D.C. Post-hearing rebuttal submissions were due seven calendar days after the final hearing day.

Current Status: Investigation Ongoing, No Determination Issued

As of October 17, 2026, the most recent document on USTR’s investigation page is the Day 4 hearing transcript. There has been no report of findings, no notice of proposed action, and no tariff annex. An annex is the list of covered products and rates attached to a Section 301 action.

Section 304 of the Trade Act of 1974, codified at 19 U.S.C. 2414(a)(2), sets two deadlines, both measured from the date of initiation. A case involving a trade agreement allows 18 months. Any other case allows 12 months. This investigation was not opened on trade agreement grounds, so the determination is due on or before March 11, 2027. USTR can act earlier and has not indicated when it intends to.

Under 19 U.S.C. 2415(a), the Trade Representative must implement any action within 30 days of the determination. The warning period therefore runs from now until a determination, rather than from a determination to a duty.

How This Relates to the Section 301 Forced Labor Investigation

The two Section 301 investigations are often confused. They are separate matters at different stages.

• What they share. Both were initiated under Section 301 in March 2026, both cover multiple economies, both are run by USTR, and both were conducted on an accelerated timeframe.
• Different legal questions. The forced labor investigations asked whether an economy had failed to prohibit and enforce against imported goods produced with forced labor. The structural excess capacity investigation asks whether government intervention sustains idle industrial capacity in a way that burdens U.S. commerce.
• Different country lists. USTR investigated 60 economies for forced labor. Of those economies, 16 are also under investigation for excess capacity.
• Different stages. In the forced labor investigations, USTR made findings and proposed action on June 5, 2026 (91 FR 34272). It announced final action on July 23 and tariffs took effect on July 24, 2026. None of that has happened in the structural excess capacity investigation.

Section 301(b) works at country level: USTR can investigate and penalize a trading partner over how it enforces prohibitions on forced labor imports. Section 307 of the Tariff Act of 1930 works at shipment level, and U.S. Customs and Border Protection (CBP) uses it to detain individual shipments suspected of containing forced labor inputs. 

What Structural Excess Capacity Findings Could Mean for Supply Chain and Sourcing Risk

Whether a particular product ends up covered by a Section 301 action depends on five things. For this investigation, two of them are knowable now, and three are not.

What determines coverage	Status in this investigation	What can be established now
The specific action	Does not exist. USTR has issued no findings and no proposed action.	Nothing to check against yet. Any change will appear on the docket first.
Product classification	Not yet defined. Any action would name specific HTS lines.	Which HTS lines in a company’s product list fall inside the 21 named sectors.
Country of origin	The 16 economies are named, but origin rules would be set by the action.	Which suppliers are located in those 16 economies, at Tier 1 and beyond. Origin follows substantial transformation rules, which look at where a good last underwent a change in character or use, rather than where it shipped from.
Effective date	None. A determination is due by March 11, 2027 at the latest.	Action normally follows within 30 days of a determination.
Exclusions	None exist, and no exclusion process has been announced.	Previous Section 301 actions have had exclusion processes. Importers should not assume one here.

No covered-product list exists yet. Several of the named metals already carry Section 232 duties, so an action here would stack onto an existing measure. Our comparison of Section 201 vs. 232 vs. 301 explains how the three programs differ.

For most companies, customs records already hold the classification work. Origin is harder, because exposure can extend beyond the tier a company can readily see. A battery cell, a semiconductor, or a chemical input can each carry origin from one of the 16 economies into a finished good assembled elsewhere.

Establishing whether a product is covered is a customs classification exercise, while supplier mapping uncovers where risk is concentrated and produces a documented record of due diligence. Talk to an EcoVadis expert about mapping your supply base.

Risk for Electronics and Semiconductor Supply Chains

Semiconductors and electronics are both named in this investigation, and the country list includes Taiwan, Korea, Malaysia, Singapore, China, and Vietnam. Several of these economies frequently appear at more than one tier of electronics supply chains, so mapping component sourcing down to their original country of origin is the only way to fully understand risk exposure.

Risk for Automotive and Battery Supply Chains

Automobiles, transportation equipment, batteries, and solar modules are all named, against a country list that includes China, Korea, Japan, Mexico, and Thailand. Cells, modules, and components can carry origin exposure even where final assembly is elsewhere. Importers should extend supplier visibility to cell and module suppliers before any action is announced.

Risk for Chemicals and Industrial Materials Sourcing

Chemicals and plastics are named against the European Union, China, Korea, Singapore, and Thailand, among others. Chemicals enter early in a bill of materials, so a duty on an input carries through to everything downstream. A modest tariff rate can therefore have a large effect on landed cost. Companies should identify which finished goods depend on inputs from the named economies.

Risk for Metals, Paper, and Base Manufacturing Inputs

Aluminum, steel, non-ferrous metals, cement, glass, and paper are all named, against a country list that includes China, the European Union, Korea, Japan, and India. These are the furthest upstream of the 21 sectors, so a duty on base inputs reaches a wider range of finished goods than a duty on a specific component.

 

FAQs

What is structural excess capacity under Section 301?

Structural excess capacity refers to industrial capacity that exceeds demand and is maintained by government support or intervention, rather than market demand. This is different than ordinary overcapacity, which corrects itself as unprofitable producers close. USTR argues that government intervention prevents that correction, with the surplus product being exported and negatively impacting U.S. manufacturing and investment.

Which countries are under investigation for excess capacity?

The investigation covers 16 economies: China, the European Union, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan, and India.

Has USTR made a determination yet?

No. As of October 17, 2026, USTR has published no report of findings and no proposed action. The most recent document in the investigation file is the hearing transcript of May 8, 2026.

Is this the same as the Section 301 forced labor tariffs?

No. Forced labor tariffs come from a separate set of Section 301 investigations covering 60 economies and addressing a different legal question. Tariffs of 10% or 12.5% under that action took effect on July 24, 2026. No tariffs have come out of the excess capacity investigation.

What happens if USTR finds these practices actionable?

USTR would begin with a report of findings, then publish a notice of proposed action with a further comment period, then a final action specifying products and rates. Under 19 U.S.C. 2415, USTR must generally implement action within 30 days of a determination, with a permitted delay of up to 180 days in defined circumstances.

When is a decision expected?

No date has been announced. The statutory deadline is March 11, 2027, being 12 months from initiation under 19 U.S.C. 2414(a)(2)(B). USTR can act at any point before then.

Sources last verified:  Checked against USTR, the Federal Register, and the Congressional Research Service on October 17, 2026.