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.

USTR — investigations, list modifications, exclusion notices, four-year statutory review
Federal Register — official notices, requests for comment, finalized actions
CBP CSMS messages — entry filing, HTS use, exclusion claim instructions
U.S. Court of International Trade — In re Section 301 Cases and follow-on litigation
U.S. International Trade Commission (USITC) — supporting investigations and HTS Schedule maintenance
Trade press, PIIE, and policy research firms for context

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.

Operator action checklistSpecific verification steps for entry classification, exclusion eligibility, and post-summary corrections.

Source linksEvery signal links back to the primary USTR notice, Federal Register entry, CSMS message, or court filing.

Pro access

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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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.