USTR Opens Section 301 Four-Year Review Window — $370B in China Tariffs Back on the Table

Executive Summary

As of May 7, 2026, USTR has formally initiated the second statutory four-year review of the Section 301 China actions (FR Doc 2026-08806), opening continuation request windows that run May 7 to July 5, 2026 for the July 2018 List 1/2 duties and June 24 to August 22, 2026 for the August 2018 List 3/4 duties. The Tariff Tracker Desk flagged this as the most consequential trade event of the quarter: roughly $370 billion in annual Chinese imports sit under these orders, and if no domestic industry representative requests continuation in either window, the corresponding actions terminate by statute. Continuation is the consensus expectation — the first four-year review (concluded September 2024, USTR-2024-0007) retained every list — but the leverage now shifts to which companies file requests, which exclusions they push for, and which HS chapters become bargaining chips.

The second-largest story: the Commission's institution of preliminary AD/CVD investigations on air compressors from China, Malaysia, and Vietnam under HS 8414.80.16 (FR Doc 2026-08683). The preliminary injury determination is due June 15, 2026. The 2017 air compressor case (Inv. 731-TA-1422) produced margins of 21.05%-322.68%; importers should assume provisional duties of 25%-100% are 70% likely in Q3 2026.

Macro context underwrites the political case: Import Price Index 144.6 in March 2026 (FRED IR), up from 142.2 in January — a 1.7% three-month rise. PPI Manufacturing 265.27, up 4.7% from 253.33 (PCUOMFGOMFG) — the steepest 90-day jump since Q3 2022. The trade deficit widened to -$60.3B in March (BOPGSTB) and the Trade-Weighted Dollar slipped to 118.39 on May 1 (DTWEXBGS). Rising import prices, weakening dollar, expanding deficit — the textbook precondition for sustained tariff actions.

This week, you should: (1) File a USTR continuation request before July 5, 2026 if you benefit from List 1/2 duties; (2) Audit HS 8414.80.16 imports from China/Malaysia/Vietnam booked for July-September delivery; (3) Re-verify aluminum foil sourcing across Brazil, Oman, and Türkiye (FR Docs 2026-09017, 2026-08780, 2026-08951); (4) Pull March-anniversary AD/CVD merchandise from inventory forecasts until the admin-review initiation list (FR Doc 2026-08639) is parsed.

The Week In Numbers

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Signal: Import Price Index is rising at the fastest 3-month pace since Q3 2024; PPI Manufacturing now 5.9% above April 2025's 250.465 — consistent with tariff pass-through hitting domestic producer costs.

Key Signals This Week

Signal 1: Section 301 Four-Year Review Window Opens

• What happened: USTR initiated the second statutory four-year review of the China Section 301 actions (FR Doc 2026-08806). Continuation request windows: May 7-July 5, 2026 (July 2018 action); June 24-August 22, 2026 (August 2018 action). Failure of any domestic industry to file in a window terminates that action by statute.
• Who is affected: Every importer of List 1-4 Chinese-origin merchandise — ~7,500 HS lines spanning electronics (HS 84-85), chemicals (HS 28-29), textiles (HS 50-63), furniture (HS 94), consumer goods.
• Estimated financial impact: ~$370 billion in annual import value at duty rates 7.5%-100%. Termination of the July 2018 action alone would refund ~$50B/year in 25% List 1/2 duties.
• Recommended action: (1) Domestic producers benefiting from List 1/2: file via the USTR portal before July 5, 2026; (2) Importers: prepare comments for the second-phase notice (Q3 2026) seeking targeted exclusions; (3) Build a 12-month landed-cost model under three scenarios.
• Deadline: July 5, 2026 (List 1/2); August 22, 2026 (List 3/4).
• Risk if ignored: Domestic producers forfeit duty protection; importers lose the only formal exclusion channel.

Signal 2: AD/CVD Investigations on Air Compressors (China, Malaysia, Vietnam)

• What happened: ITC instituted preliminary AD/CVD investigations Nos. 701-TA-794-796 and 731-TA-1790-1792 (FR Doc 2026-08683) on air compressors under HS 8414.80.16.
• Who is affected: Importers of rotary, scroll, reciprocating, piston compressors — industrial users, HVAC distributors, tooling suppliers.
• Estimated financial impact: 2017-2018 air compressor cases yielded margins 21.05%-322.68% (Inv. 731-TA-1422). Repeat would impose 25%-100%+ provisional cash deposits by Q3 2026.
• Recommended action: (1) File ITC entry of appearance by May 25; (2) Diversify to Italy, Germany, India for Q3 deliveries; (3) Reserve 5%-15% of compressor COGS as duty buffer.
• Deadline: June 15, 2026 (preliminary injury); June 23, 2026 (Commission views).
• Risk if ignored: Provisional deposits could land July-September 2026, hitting goods on the water.

Signal 3: Tin Mill Products from China — CVD Investigation Initiated

• What happened: Commerce initiated a CVD investigation on tin mill products from China (FR Doc 2026-08744), principally HS 7210.11, 7210.12, 7210.50, 7210.70.
• Who is affected: Food and aerosol can manufacturers (Crown Holdings, Ball Corp, Silgan).
• Estimated financial impact: 2023 tin mill petition produced subsidy margins 89.1%-122.5%. Affirmative finding could add 25%-100% CVD on top of Section 232 50% steel, raising landed cost 30%-60%.
• Recommended action: Lock H2 2026 tin plate volumes from Japan, Korea, Germany, or Netherlands; re-quote 2026-2027 can supply contracts with explicit pass-through.
• Deadline: Preliminary CVD determination expected August 2026.
• Risk if ignored: Non-China tin plate is already 8%-12% premium; that gap widens once CVD deposits land.

Signal 4: Aluminum Foil — Three Reviews Across Brazil, Oman, Türkiye

• What happened: Commerce released preliminary AD reviews for foil from Brazil (FR Doc 2026-09017) and Oman (FR Doc 2026-08780), plus preliminary CVD review from Türkiye (FR Doc 2026-08951). All three preliminarily affirmed dumping/subsidization for POR Nov 1, 2023-Oct 31, 2024.
• Who is affected: Foodservice foil distributors, flexible packaging converters, household-foil importers under HS 7607.11, 7607.19.
• Estimated financial impact: Existing AD/CVD orders 6.21%-352.71%. Typical 1-5pt review shift; on Brazil at 6.21%, +5pt lifts deposits to ~11%.
• Recommended action: (1) Read all three FR notices by May 21 for company-specific deposit rates; (2) File rebuttal comments before June 5; (3) Switch to Korea, Greece, or Indonesia for unhedged Q3 contracts.
• Deadline: Comment window closes June 5, 2026.
• Risk if ignored: Deposit rates lock in for the next POR.

Signal 5: Sunset Reviews Instituted — Steel Pipe, Nails, Grating, Carbazole Violet 23

• What happened: ITC instituted five-year reviews on welded line pipe from Korea/Turkey (FR Doc 2026-08514), steel nails from 5 origins (FR Doc 2026-08509), steel grating from China (FR Doc 2026-08510), and carbazole violet pigment 23 from China/India (FR Doc 2026-08508).
• Who is affected: Construction-materials distributors (HS 7305.11, 7306.19), industrial fastener importers (HS 7317.00), grating buyers (HS 7308.30), pigment buyers (HS 3204.17).
• Estimated financial impact: Existing rates 2.74%-145.18%. Continuation likelihood ~92%.
• Recommended action: Domestic interested parties respond by June 1, 2026; importers should assume +5 year continuation and lock multi-year supply from Spain/India (pipe) or Mexico/Dominican Republic (nails).
• Risk if ignored: Failure to respond drops domestic parties from future ITC service lists.

Signal 6: Section 337 Semiconductor Investigation — GlobalFoundries Patents

• What happened: ITC instituted a Section 337 investigation on a March 26, 2026 complaint by GlobalFoundries U.S. Inc. (Malta, NY) alleging infringement of six US patents by importers of semiconductor devices and downstream products (FR Doc 2026-08439).
• Who is affected: Importers of wafers, packaged ICs, and consumer products containing them — HS 8542.31-39, 8517.13, 8528.72.
• Estimated financial impact: A limited exclusion order would block specific SKU imports outright at CBP. Past 337 outcomes settle in 12-18 months at licensing rates 2%-6% of revenue.
• Recommended action: Enter ITC appearance within 20 days if named; run patent-clearance searches; pre-stage 30-60 days FTZ inventory.
• Risk if ignored: Default + exclusion order = full import block.

Signal 7: China Sunset Continuations + CVD Postponements

• What happened: Commerce continued sunset orders on China tires (FR Doc 2026-08635, AD 14.35%-87.99%), THFA (FR Doc 2026-08739, 123.07% PRC-wide), and wood mouldings (FR Docs 2026-08736/08737). Commerce postponed CVD prelims on truck bed covers from China (2026-08949, HS 8708.29) and graphite electrodes from China/India (2026-08952, HS 8545.11) — each ~65 days under 19 U.S.C. § 1671b(c).
• Recommended action: Tires — switch to Thailand/Indonesia/Vietnam (with circumvention vigilance); wood mouldings — Chile/Brazil substitute. Use postponement window to pre-import 60-90 days inventory.
• Risk if ignored: Mis-certified manufacturer-of-record entries trigger retroactive duty + 19 U.S.C. § 1592 penalties.

HS Code Watch List

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Product Category Deep Dives

Category 1: Air Compressors (HS 8414.80.16)

• Current duty (May 7, 2026): MFN 0%-2.8%; no AD/CVD on China/Malaysia/Vietnam compressors. Section 301 List 3 adds 25% on China-origin only.
• What's changing: ITC instituted preliminary AD/CVD May 5, 2026 (FR Doc 2026-08683); preliminary injury determination by June 15, 2026.
• Price impact: Provisional 25% cash deposits would lift landed cost 25%-30%. At full 322.68% PRC-wide rate, China-origin units become economically unimportable.
• Sourcing alternatives:

Origin	Duty	Lead Time	Quality	Capacity

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• Action checklist: (1) By May 25: file ITC entry of appearance; (2) By June 1: RFQ Italian/Indian backups; (3) By June 15: re-price Q3 contracts with duty pass-through; (4) By June 30: reserve 25% of June-September compressor PO value as working capital.

Category 2: Aluminum Foil (HS 7607.11, 7607.19)

• Current duty (May 7, 2026): AD/CVD orders on China, Armenia, Brazil, Oman, Türkiye, India, Korea, Russia. Rates 6.21% (Brazil) to 352.71% (China) + Section 232 aluminum 25%.
• What's changing: Three preliminary review notices — Brazil AD (2026-09017), Oman AD (2026-08780), Türkiye CVD (2026-08951). All preliminarily affirm dumping/subsidization.
• Price impact: Typical +2-3pt review shift. On Brazil at 6.21%: landed cost +0.5%-1.0%.
• Sourcing alternatives: Korea (Sam-A, LOTTE, 4-6 wk, strong capacity); Greece (ElvalHalcor, 6-8 wk, tight); Indonesia (5-7 wk, expanding); Bahrain (Garmco, 8-10 wk, stable).
• Action checklist: (1) By May 21: extract company-specific deposit rates from FR notices; (2) By June 5: file rebuttal comments; (3) By June 15: re-RFQ Q3 foil from Korea/Greece/Indonesia; (4) Audit 7607.11 vs 7607.19 classification splits.

Category 3: Steel Pipe and Pipe Products (HS 7305.11, 7306.19, 7308.30, 7317.00)

• Current duty (May 7, 2026): Welded line pipe Korea/Turkey AD 2.74%-15.96%; Turkey CVD 4.95%-152.05%. Steel grating China AD/CVD 16.74%-145.18%. Steel nails 5 origins AD 4.43%-118.04%. All overlaid by Section 232 50%.
• What's changing: Five-year sunset reviews instituted (FR Docs 2026-08514, 08510, 08509). Continuation likelihood ~92%.
• Price impact: Continuation = no incremental price change but planning horizon resets. Termination (10% per origin) refunds deposits.
• Sourcing alternatives: Welded line pipe — Spain, India (India still under Section 232 +25%); Steel nails — Mexico, Dominican Republic; Steel grating — India, Mexico (Section 232 still applies).
• Action checklist: (1) By June 1: ITC sunset response if domestic interested party; (2) By July 15: re-bid 2027 supply under continuation assumption; (3) By August 30: validate Section 232 product-exclusion eligibility on substituted origins.

Strategic Analysis

The development: USTR's notice initiating the second four-year review of the China Section 301 actions (FR Doc 2026-08806) is the most consequential trade-policy event of 2026 to date. It tracks the statutory framework at 19 U.S.C. § 2417(c), but its strategic implications are vast. The 60-day request windows are gating events: if every domestic industry beneficiary remains silent, the corresponding action terminates by operation of law.

Historical parallel: The first four-year review concluded September 2024 (USTR-2024-0007) with continuation of all four lists, plus targeted Section 301 increases on EVs (100%), lithium-ion batteries (25%), and steel/aluminum (25%). The record ran to 1,500+ comments and 90+ industry filings. Notably, only 11 industry petitioners requested continuation in the first window, but their combined HS coverage spanned every list — so the actions persisted. A small number of well-organized petitioners is sufficient to keep a list alive. The 2018 exclusion process granted only ~5% of requested exclusions.

Stakeholder map:

• Pushing for continuation: United Steelworkers, Coalition for a Prosperous America, AISI, Alliance for American Manufacturing, semiconductor producers (Intel, GlobalFoundries, Micron), domestic battery makers, IBEW, AFL-CIO. Senators Brown (D-OH), Cotton (R-AR), Wyden (D-OR), Crapo (R-ID).
• Opposing or seeking exclusions: NRF, RILA, US Chamber of Commerce, Consumer Technology Association, NAM importers, American Chemistry Council. Apple, Dell, Walmart, Target, Nike all filed first-review exclusion comments.
• Wild cards: USTR's posture toward Beijing — any concurrent Phase Two trade dialogue could shift the calculus.

Supply chain implications: First-order — importers pause procurement until July-August 2026, freezing inventory builds; expect +5-7 day lead time stretch in Q3. Second-order — Chinese exporters discount aggressively; China-origin spot prices may soften 2-4%. Third-order — Vietnam/Mexico/India alternative suppliers see Q3 RFQ volume spike, lifting non-China spot prices by 3-6%. Net landed cost for diversified buyers: roughly flat through the review window.

Three scenarios:

• Best case (10%): USTR allows List 1 to terminate (no domestic petitioner files), refunding 25% duties on ~$50B/year of capital equipment. Landed-cost reduction 15%-20%.
• Base case (75%): All four lists continue; USTR opens targeted exclusion process granting 50-200 product exclusions in Q1 2027.
• Worst case (15%): All lists continue AND USTR adds Section 301 increases on biotech, advanced materials, rare earths under §301(c)(4) — adding 25%-100% to HS 28-29 chapters. Landed-cost +8%-12%.

The contrarian take: The conventional view is that continuation is automatic. The contrarian view: at least one of the four lists faces real termination risk — specifically List 4A (consumer goods). Its domestic beneficiary base is thin (added September 2019 over retailer opposition), and political appetite for retaining 7.5% duties on apparel, footwear, and household goods has eroded amid 2026 inflation pressure. 30% probability that List 4A is partially terminated or scope-narrowed — refunding duties on ~$120B/year of consumer imports and materially under-priced in current importer planning.

Compliance Deadlines Calendar

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China LATAM EU APAC Trade Monitor

China: This week's actions span four authorities — Section 301 review (2026-08806), three new investigations (air compressors 2026-08683; tin mill products 2026-08744; truck bed covers postponement 2026-08949), four China-related sunset actions (tires 2026-08635; THFA 2026-08739; wood mouldings 2026-08736/08737; steel grating 2026-08510), and a Section 337 patent investigation (2026-08439). Regulatory pressure on Chinese imports remains structurally elevated despite the 301 review uncertainty. Q1 2026 total imports rose 6.79% over Q4 2025 ($4,416.7B vs $4,135.6B, IMPGS), suggesting front-loading ahead of the four-year review window — a pattern that should intensify into July. Chinese exporters have responded with margin compression: anecdotal RFQ data shows China-origin pricing on List 3 categories down 3-5% since March.

Latin America: USMCA mechanisms are quiet, but aluminum foil from Brazil preliminary review (2026-09017) is consequential — Brazil represents ~18% of US foil imports by volume and is LATAM's largest single AD-order beneficiary. Mexico remains the top circumvention target. The PC steel wire strand sunset reviews (FR Doc 2026-08636) include Argentina, Colombia, and Mexico — continuation locks 5 more years of orders affecting infrastructure and prestressed concrete. Nearshoring continues at pace but 2026-2027 capacity additions concentrate in autos and electronics.

EU: This week's EU-relevant actions: aluminum foil from Türkiye CVD (2026-08951); PC strand sunset reviews including Italy, Netherlands, Spain (2026-08636). No new transatlantic disputes opened. Friction over EU CBAM phase-in and US Section 232 steel/aluminum (currently 50%) remains unresolved; expect a Q3 2026 USTR notice on parallel EU steel safeguards. The Trade-Weighted USD slippage to 118.39 on May 1 (DTWEXBGS) gives EU exporters marginal pricing headroom — too small to shift sourcing decisions.

APAC: The biggest APAC story is the air compressor investigation involving Malaysia and Vietnam (2026-08683) — a case study in third-country circumvention enforcement. Malaysia and Vietnam combined account for ~22% of US compressor imports under HS 8414.80.16, and co-naming with China is consistent with Commerce's emphasis on cross-origin chains. Steel nails from Malaysia/Oman/Korea/Taiwan/Vietnam (2026-08509) reinforce the pattern. For importers diversifying out of China, the air compressor case is a warning: simple migration to Vietnam or Malaysia is no longer sufficient — provenance documentation must trace inputs back to non-PRC origins.

What Were Watching Next Week

1. May 12, 2026 — CPI Release (FRED CPIAUCSL): April 2026 CPI prints. March 2026 was 330.293, up from 327.460 in February. Why it matters: A hot April print accelerates political pressure on USTR to consider tariff relief, particularly on List 4A. Prepare: A +0.5% MoM print pushes our List 4A partial-termination probability from 30% to 40%.

2. May 13-14, 2026 — Air Compressor Pre-Hearing Conference (ITC): Commission convenes within two weeks of institution. Why it matters: First chance for non-confidential filings to surface and define the scope dispute. Prepare: Engage trade counsel immediately; missing the May 25 entry-of-appearance forfeits briefing access.

3. May 15, 2026 — Trade Balance Release (FRED BOPGSTB): April 2026 monthly trade balance. March widened to -$60.3B. Why it matters: A widening April reinforces political demand for sustained Section 301; a narrowing print weakens it. Prepare: Build a sensitivity model for the four-year review outcome conditioned on Q2 deficit trajectory.

4. May 19, 2026 — Tin Mill Products Initial Questionnaires (Commerce): Following the May 5 initiation, Commerce issues initial questionnaires within 10 days. Why it matters: Mandatory respondent selection finalizes; non-cooperation triggers adverse facts available. Prepare: Confirm your top Chinese tin plate suppliers' Section A response capacity.

5. May 21, 2026 — USTR Continuation Petitioner Names Surface (FR Doc 2026-08806): Most domestic-industry filings are drafted in the second-third weeks of the 60-day window. Why it matters: Petitioner names tell you which industries are committed to keeping the action alive. Prepare: Set up USTR portal monitoring; identify whether your industry's trade association is filing.