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Section 301 · Unfair foreign trade practices

Section 301 — China tariffs, IP investigations, list modifications.

Section 301 of the Trade Act of 1974 authorizes the U.S. Trade Representative (USTR) to investigate and respond to foreign acts, policies, or practices that burden or restrict U.S. commerce. The active 301 actions are best known for the multi-list tariffs on imports from China, covering electronics, semiconductors, EVs and batteries, solar, machinery, apparel, and many other categories. TariffSignals tracks USTR proceedings, list modifications, exclusion processes, statutory four-year reviews, and CBP CSMS implementation messages.

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Who is exposed

Who needs to monitor Section 301.

Importers sourcing from ChinaElectronics, batteries, semiconductors, EVs, solar, machinery, apparel, furniture, and thousands of other HTS lines on Lists 1–4.
Tech & semiconductor supply chainsHTS 8542 (ICs), 8541 (semiconductor devices, solar cells), 8504 (transformers/power), and adjacent codes with active exclusion attention.
EV, battery, and clean-tech buyersHTS 8507 batteries, 8703 EVs, 8541 PV cells/modules — all touched by tariff and trade-remedy stacks.
Trade counsel & consultantsExclusion request strategy, scope verification, four-year review filings, and rebate / refund risk assessment.
Primary sources monitored

Where Section 301 changes appear first.

What TariffSignals shows

Section 301 intelligence on TariffSignals.

List statusList 1, 2, 3, 4A and 4B coverage, exclusion buckets, expiring exclusions, and statutory review checkpoints.
Per-HS exposureCensus import flows for affected HTS categories. See the actual dollar exposure for batteries, semiconductors, solar, apparel, and more.
Origin concentrationHow much of an HS category's U.S. import volume comes from China vs. shifted to Vietnam, Mexico, or other origins.
Effective datesNotice date, comment deadline, effective date, and exclusion expiration date for every active action.
Broker / counsel checkSpecific verification steps for entry classification, exclusion eligibility, and post-summary corrections — for your broker and trade counsel review.
Source linksEvery signal links back to the primary USTR notice, Federal Register entry, CSMS message, or court filing.
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Pro unlocks the full Section 301 signal feed, exclusion tracking, per-HS exposure intelligence, RSS feeds for batteries / semiconductors / solar / apparel, and client briefs. $149/mo · $1,490/yr · Team (5 seats) $299/mo
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How TariffSignals monitors Section 301

Source flow, refresh cadence, and output shape.

Refresh cadenceUSTR press feed and Federal Register polled every six hours. CBP CSMS messages ingested as they post. Per-HS news feeds for batteries (8507), semiconductors (8542), solar (8541), apparel (6109), and others refresh on the same 6-hour interval.
Source flowUSTR notice or investigation update → article ingest → mapped to List 1 / 2 / 3 / 4A / 4B and to the relevant HTS chapters → signal ranked. Federal Register exclusion notices and four-year review materials cross-reference the original USTR action.
Output shapeEach Section 301 signal exposes: plain-English summary, list identifier, affected HTS chapters, exclusion status / expiration, effective date, broker / counsel check, watch-next, and Census-derived origin concentration (China vs. shifted origins like Vietnam, Mexico).
What you can do with itGenerate exclusion-strategy briefs, wire per-HS RSS feeds (batteries / semis / solar / apparel) into Feedly / Inoreader / Slack / email, and pair Section 301 signals with exposure intelligence to see which import flows shifted in response to the action.
Frequently asked questions

Section 301 — quick answers.

What is Section 301?

Section 301 of the Trade Act of 1974 authorizes the U.S. Trade Representative (USTR) to investigate and respond to foreign acts, policies, or practices that burden or restrict U.S. commerce. The active 301 actions are best known for the multi-list tariffs on imports from China.

What are Lists 1, 2, 3, 4A, and 4B?

The four tariff lists target different categories of imports from China. Lists 1, 2, and 3 cover industrial inputs, electronics, machinery, and a wide range of intermediate and consumer goods. List 4A covers further consumer products. List 4B was issued but remained suspended.

Can I get a Section 301 exclusion?

USTR has run multiple rounds of exclusion processes for narrow product categories. Currently, statutory exclusion windows are limited and product-specific. Importers should check the active USTR notice for eligibility, the application window, and required justification.

What was the four-year review?

The Trade Act requires a statutory review of Section 301 tariffs every four years. The 2024 four-year review modified product coverage in targeted categories — electric vehicles, batteries, semiconductors, solar cells, and others — and shifted tariff rates upward on certain HTS lines.

How do Section 301 tariffs stack with other duties?

Section 301 is additive. An import can carry the base most-favored-nation (MFN) rate, Section 232 if applicable, Section 301 if applicable, and AD/CVD if applicable. The combined rate is what gets deposited at entry.

Related regimes

Pair Section 301 with the other monitored regimes.

Section 232 Section 301 AD/CVD USMCA CBP CSMS Tariff Exposure
Important notice

TariffSignals provides informational analysis for issue-spotting and professional awareness only. It is not legal, tax, customs, or compliance advice. Section 301 tariff treatment, list applicability, exclusion eligibility, and HTS classification are fact-specific. Verify with a licensed customs broker or qualified trade attorney before any commercial decision. See our Terms and Privacy policies.