On March 11 and March 12, 2026, the Office of the United States Trade Representative launched two of the most consequential sets of trade investigations in a generation. The first of the Section 301 investigations 2026 targets 16 major economies for structural manufacturing overcapacity. The second of the Section 301 investigations 2026 targets 60 economies for failure to enforce prohibitions on goods produced with forced labour. Public hearings on the overcapacity investigation begin May 5, 2026. The connection to Section 122, the 15% global surcharge currently applied to all US imports, is explicit: Ambassador Jamieson Greer has stated publicly that he intends to conclude these Section 301 investigations 2026 before the Section 122 tariff expires on July 24, 2026. The strategic intent is clear. Section 122 is temporary by statute and capped at 15% by law. Section 301 tariffs have no expiry date and no statutory rate cap. July 24 is not simply the day Section 122 ends. It is the date on which a new, permanent, litigation-resistant tariff architecture may replace it. This guide covers what the Section 301 investigations are, which sectors and countries face the highest exposure, what the July 24 timeline means operationally for importers, and the one action every business with supply chain exposure must take before the hearings end.
Two Parallel Section 301 Investigations 2026: Structure, Countries and Sectors
The two investigations are legally distinct, procedurally parallel, and commercially interrelated. Both were initiated under Section 301(b) of the Trade Act of 1974, which authorises USTR to investigate foreign acts, policies, and practices that are unreasonable or discriminatory and burden or restrict US commerce. The full text of both investigations is published on the USTR official press release.
Investigation 1: Structural Excess Capacity (16 Economies)
Initiated March 11, 2026. USTR is investigating whether the acts, policies, and practices of 16 major economies create structural manufacturing overcapacity that burdens or restricts US commerce. The 16 economies named are: China, the European Union, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, South Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan, and India.
The investigation examines overcapacity across the following manufacturing sectors:
- Steel, aluminium, and other metals
- Automobiles and automotive parts
- Batteries and critical minerals-based technologies
- Semiconductors and advanced electronics
- Industrial machinery, robotics, and advanced manufacturing equipment
- Chemicals, plastics, and construction materials
- Solar modules and other renewable energy components
USTR’s theory is that government-supported overbuilding in these sectors, backed by subsidies, state-linked financing, and preferential regulation, depresses global prices and undercuts US producers. The investigation will assess whether these conditions meet the legal threshold of being unreasonable or discriminatory under Section 301.
Investigation 2: Forced Labour Enforcement Failures (60 Economies)
Initiated March 12, 2026. USTR is investigating whether 60 economies fail to impose and effectively enforce prohibitions on the importation of goods produced with forced labour. The legal foundation is Section 307 of the Tariff Act of 1930, which has for almost 100 years prohibited the importation of goods produced with forced labour into the United States. USTR frames the Section 301 action as a trade enforcement mechanism: countries that permit forced labour production gain a cost advantage in manufacturing that burdens US commerce, meeting the unreasonable practice threshold under Section 301.
The forced labour investigation covers a far broader country set than the overcapacity investigation. The 60 economies span Asia, Latin America, Africa, and the Middle East. Many are close US allies and trading partners. The investigation does not allege that all 60 are engaged in forced labour themselves. It alleges that their failure to enforce import prohibitions on forced labour goods allows those goods to enter their markets and then potentially flow to the United States through transshipment or supply chain integration.
Section 301 Investigations 2026: The Complete Timeline to July 24
- March 11, 2026: Overcapacity investigation initiated. USTR requests consultations with all 16 economies
- March 12, 2026: Forced labour investigation initiated. 60 economies notified
- March 17, 2026: Dockets open for public written comments. Comment period begins
- April 15, 2026: Deadline for written comments, requests to appear at hearings, and summaries of testimony for both investigations. This deadline has passed. Companies that did not submit comments by April 15 cannot testify at the hearings and will have limited ability to seek product exclusions
- April 28, 2026: Forced labour public hearings begin at the US International Trade Commission, 500 E Street SW, Washington DC
- May 1, 2026: Potential last day of forced labour hearings
- May 5, 2026: Overcapacity public hearings begin at the USITC
- May 8, 2026: Final day of overcapacity hearings as currently scheduled
- Seven calendar days after final hearing: Deadline for post-hearing rebuttal comments for both investigations
- July 24, 2026: Section 122 expires. Ambassador Greer’s stated target date for concluding Section 301 investigations and proposing remedies. The most likely date for announcement of new Section 301 tariff actions if investigations find violations
Section 301 Investigations 2026 vs IEEPA and Section 122: Five Critical Differences
Every importer following the Section 301 investigations 2026 needs to understand one fundamental difference about why this matters more than IEEPA. IEEPA tariffs were struck down because IEEPA does not authorise tariffs. Section 122 tariffs expire July 24 because Section 122 caps surcharges at 150 days. Section 301 tariffs, once imposed following a completed investigation, have neither of these constraints. They are:
- Permanent until affirmatively removed: The first Trump administration imposed Section 301 tariffs on Chinese goods in 2018. Those tariffs are still in force in 2026. Eight years. No expiry. Section 301 tariffs imposed following these investigations would begin on the same permanent footing
- Uncapped by statute: Section 122 is limited to 15% by statute. Section 301 has no rate cap. USTR can recommend tariffs equivalent in value to the burden imposed by the foreign practice, which means rates calibrated to the IEEPA tariff levels that preceded them
- Country and sector specific: Rather than a flat global rate, Section 301 tariffs can be applied at differentiated rates by country and sector. A Vietnamese steel manufacturer, a Taiwanese semiconductor producer, and a Bangladeshi garment factory could face materially different tariff outcomes depending on how USTR structures the remedy
- Litigation resistant: Section 301 requires a formal investigation, public comment process, and documented findings before tariffs can be imposed. That process record makes the resulting tariffs substantially harder to challenge in court than the IEEPA tariffs were. The Supreme Court ruled on IEEPA in part because the statutory authority was thin. Section 301’s procedural requirements create a much stronger administrative record
- Stackable: Section 301 tariffs stack on top of MFN duty rates, antidumping and countervailing duties, Section 232 tariffs, and any other applicable measures. An affected product could face multiple stacked obligations simultaneously
Section 301 Investigations 2026: Which Importers Face the Highest Exposure
The overcapacity investigation targets seven specific manufacturing sectors. Importers sourcing products in these categories from any of the 16 named economies face the highest risk of new Section 301 tariff actions. The exposure matrix by sector and sourcing country:
| Sector | Highest Risk Origins | Existing Section 301 Exposure | New 2026 Exposure |
|---|---|---|---|
| Steel and metals | China, Vietnam, India, South Korea | 25% on Chinese goods (existing 301) | All 16 economies under investigation |
| Automotive and parts | China, Mexico, Japan, South Korea, India | 25% Chinese, Section 232 on steel content | All 16 economies |
| Batteries and critical minerals | China, Indonesia, Malaysia, South Korea | 25% Chinese battery components | All 16 economies |
| Semiconductors and electronics | Taiwan, South Korea, China, Malaysia, Vietnam | 25% Chinese semiconductors (existing 301) | All 16 economies |
| Solar and renewables | China, Vietnam, Cambodia, Malaysia, Thailand | 25% Chinese, AD/CVD on multiple SEA origins | All 16 economies |
| Industrial machinery | China, Japan, Germany (EU), Taiwan | 25% Chinese machinery | All 16 economies |
| Chemicals and plastics | China, South Korea, India, EU | 25% Chinese chemicals | All 16 economies |
What the April 15 Comment Deadline Means for Importers Who Missed It
The April 15 deadline for written comments and hearing appearance requests has passed. Companies that did not submit written comments or request to testify at the public hearings face two specific consequences:
- Limited exclusion rights: When USTR imposes Section 301 tariffs following a completed investigation, companies that participated in the administrative record by submitting comments are better positioned to seek product-specific exclusions. Companies that did not participate have a thinner record to point to in demonstrating their specific business impact. As Crowell and Moring noted in their client advisory, companies should not rely solely on trade association or coalition comments, as these cannot capture specific company facts, supply chain structure, or cost exposure
- Limited ability to challenge: The Section 301 investigation creates an administrative record that courts defer to. A company that had no presence in that record has less standing to challenge the resulting tariff action on procedural grounds than one that did
What remains available in the Section 301 investigations 2026 process after April 15 is the post-hearing rebuttal comment window, which opens seven calendar days after the final hearing day. For the overcapacity investigation, the final hearing is currently scheduled for May 8, making the rebuttal deadline approximately May 15, 2026. This window allows companies to respond to testimony given at the hearings and add factual information to the record even without having formally testified.
Section 301 Investigations 2026: Three Scenarios for What Happens After July 24
Every importer needs a landed cost strategy for what the Section 301 investigations 2026 produce after July 24. Three scenarios are commercially plausible:
Scenario 1: Section 301 Tariffs Announced on or Around July 24
Ambassador Greer concludes both investigations by July 24, finds violations in some or all of the targeted economies and sectors, and announces new Section 301 tariffs timed to replace Section 122 as it expires. The tariffs would be country and sector specific, meaning some importers face materially higher rates than under the uniform Section 122 regime while others face lower or zero new tariffs depending on their sourcing country and product category. This is the scenario the White House has publicly signalled as the intended outcome. Importers in the seven targeted sectors sourcing from the 16 named economies should plan this scenario as their primary exposure case.
Scenario 2: Section 122 Expires, Negotiations Replace Tariff Actions
USTR uses the investigation findings as negotiating leverage rather than imposing tariffs immediately. Trading partners commit to policy changes on overcapacity and forced labour enforcement in exchange for tariff forbearance. This is the path several of the named economies are actively pursuing through diplomatic channels. The EU has already initiated consultations with USTR. Japan and South Korea have expressed concern through official channels. India has signalled willingness to negotiate. If bilateral agreements are reached before July 24, the tariff outcome for those specific economies may be more favourable than Scenario 1. But the investigation record and USTR’s authority to impose tariffs remain in place, making these agreements fragile and enforcement-dependent.
Scenario 3: Investigations Continue Beyond July 24
USTR does not conclude the Section 301 investigations 2026 by July 24 and Section 122 expires without an immediate replacement. A temporary tariff gap opens between Section 122 expiry and the imposition of new Section 301 measures. This scenario would produce the lowest short-term landed cost for affected importers but is the least stable: Section 301 tariffs resulting from investigations already this advanced would follow within weeks or months. Importers who restructure procurement around a tariff gap that closes quickly would face a second costly adjustment.
Section 301 Investigations 2026: Four Actions Every Importer Must Take Now
- Map every active import corridor against the investigation scope. For each country you source from, confirm whether it appears in the overcapacity 16, the forced labour 60, or both. For each product category, confirm whether it falls within the seven overcapacity sectors. This mapping exercise produces your Section 301 exposure matrix: the specific corridors and product categories where new tariff actions would affect your landed cost most materially
- Model your landed cost under Scenario 1 as your planning base case. For each high-exposure corridor, calculate your landed cost at the equivalent of the prior IEEPA rate for that country, since USTR has signalled the intent to replicate IEEPA levels through Section 301. If that landed cost makes your current supply chain unviable at existing pricing, you have until July 24 to begin restructuring. That is not much time
- Submit post-hearing rebuttal comments if your product category is being discussed at the May 5 to 8 hearings. The rebuttal window closing approximately May 15 is the last formal opportunity to place factual information about your business, supply chain, and cost structure into the administrative record. Companies that participate in any part of the record are better positioned for exclusion requests than those with no record presence
- Review your IOR structure in every affected sourcing country. If Section 301 tariffs reshape your optimal sourcing geography, the import compliance infrastructure in any new or expanded sourcing corridor must be confirmed before the first shipment. BIS India certification takes 3-6 months. Vietnamese MOIT approval takes 1-3 months. These timelines run concurrently with the July 24 deadline
How Carra Globe Supports Importers Through the Section 301 Investigations 2026
Carra Globe provides Global Trade Compliance services covering Section 301 exposure assessment across all 16 overcapacity and 60 forced labour investigation countries, landed cost scenario modelling under all three July 24 outcomes, and supply chain restructuring analysis for businesses assessing alternative sourcing corridors. Our Importer of Record services are active across all 16 overcapacity investigation economies and the full forced labour country set, providing immediate compliant import capability in any new sourcing corridor without the delay of entity establishment. Our Delivered Duty Paid service incorporates Section 301 scenario modelling into landed cost calculations for procurement decisions being made now, before July 24 tariff outcomes are confirmed. For a complete understanding of the current US tariff landscape that Section 301 will reshape, see our related guides to the SCOTUS IEEPA ruling, the Section 122 tariff 2026, and our existing Section 301 tariffs guide. For businesses assessing supply chain restructuring away from China and other investigation targets, see our guide to supply chain diversification away from China 2026. For the full explanation of what an Importer of Record does in this context, our IOR explainer covers the legal and operational role in detail.
Frequently Asked Questions: Section 301 Investigations 2026
What is the difference between the Section 301 investigations 2026 and Section 122?
Section 122 is a temporary global surcharge capped at 150 days and 15% by statute. Section 301 is a targeted, country and sector-specific trade remedy with no statutory expiry date and no rate cap. Section 301 requires a formal USTR investigation before tariffs can be imposed, but once imposed they remain in force indefinitely. The 2018 Section 301 tariffs on Chinese goods are still operative in 2026. Section 301 investigations 2026 are designed to produce a more durable replacement for the temporary Section 122 surcharge.
Which countries are under the overcapacity Section 301 investigation?
China, the EU, Singapore, Switzerland, Norway, Indonesia, Malaysia, Cambodia, Thailand, South Korea, Vietnam, Taiwan, Bangladesh, Mexico, Japan, and India. These 16 economies are being examined for whether their industrial policies create structural manufacturing overcapacity that burdens US commerce across seven sectors: steel and metals, automotive, batteries and critical minerals, semiconductors, solar and renewables, industrial machinery, and chemicals and plastics.
Can I still participate in the Section 301 investigations 2026 process?
The April 15 comment deadline has passed. However, post-hearing rebuttal comments are available approximately seven days after the final hearing, currently around May 15 for the overcapacity investigation. This window allows companies to respond to hearing testimony and place factual information about their supply chain exposure into the administrative record. Companies with significant exposure in targeted sectors and countries should use this window. Participation in any part of the record strengthens exclusion request standing if Section 301 tariffs are ultimately imposed.
Will Section 301 tariffs stack on top of existing duties?
Yes. Section 301 tariffs stack on top of MFN duty rates, existing Section 301 tariffs on Chinese goods, Section 232 tariffs on steel and aluminium, antidumping and countervailing duties, and any other applicable measures. For Chinese goods, new Section 301 tariffs resulting from the overcapacity investigation would stack on top of the existing 25% Section 301 tariffs already in place since 2018, plus the MFN rate, plus any applicable Section 232.
What is the forced labour investigation and how is it different from the UFLPA?
The UFLPA (Uyghur Forced Labor Prevention Act) is a specific US law creating a rebuttable presumption that goods from Xinjiang are produced with forced labour. The Section 301 forced labour investigation is broader: it examines whether 60 economies fail to enforce their own import prohibitions on forced labour goods, and whether that failure constitutes an unreasonable trade practice under Section 301. The UFLPA targets specific goods from a specific region. The Section 301 forced labour investigation targets government-level enforcement failures across 60 countries and could result in tariff actions on a much wider range of goods from a much wider range of origins.
What happens to goods from USMCA countries under Section 301?
Mexico is named in the overcapacity investigation for seven manufacturing sectors. USMCA exemption status applies to Section 122. It does not automatically apply to Section 301. Any Section 301 tariffs imposed on Mexico as a result of the overcapacity investigation would apply to qualifying goods regardless of USMCA status unless the USMCA exemption is explicitly incorporated into the Section 301 remedy structure. This is a material difference from the current Section 122 position and represents one of the most significant sources of landed cost uncertainty for businesses that restructured supply chains toward Mexico under USMCA preferential treatment.