Aluminum Extrusions and Softwood Lumber Face Dual AD/CVD Preliminary Results as Manufacturing PPI Surges 3.1% — De Minimis Suspension Continues

Executive Summary

As of April 15, 2026, the U.S. Department of Commerce has released dual preliminary results for aluminum extrusions from China (FR Docs 2026-07303 and 2026-07229) covering both countervailing duty and antidumping duty administrative reviews for 2024-2025, while simultaneously publishing dual preliminary results for Canadian softwood lumber (FR Docs 2026-07154 and 2026-07153) — a convergence of trade enforcement actions affecting an estimated $18 billion in combined annual imports. The Tariff Tracker Desk flags this as the most significant single-day filing cluster in Q2 2026.

The headline macro signal demands immediate attention: PPI Manufacturing surged to 265.266 in March 2026 (FR series PCUOMFG), a 3.15% month-over-month increase from February's 257.169 — the largest single-month jump since the tariff escalation began. Meanwhile, the Trade Weighted Dollar has fallen 1.8% since March 31 to 118.8552 as of April 10, meaning importers face a double squeeze: rising producer costs AND weaker purchasing power for dollar-denominated imports.

Adding to the enforcement wave, the International Trade Commission has instituted new AD/CVD investigations on tin mill products from China, Taiwan, and Turkey (FR Doc 2026-07146) and new AD investigations on PTMEG from four countries (FR Doc 2026-07072), while President Biden signed a continuation of the de minimis duty-free treatment suspension (FR Doc R1-2026-03829). Three Section 337 patent investigations were also instituted, including one targeting Chinese electric aircraft components (FR Doc 2026-07152).

This week, you should: (1) Review your aluminum extrusion supply chain — Commerce found no Chinese companies qualified for separate rates, meaning the China-wide entity rate applies to all; (2) Request updated softwood lumber duty deposit rates from your customs broker within 10 business days; (3) Verify tin mill product sourcing if you import food-grade tinplate from China, Taiwan, or Turkey — preliminary determinations expected by May 26, 2026; (4) Audit de minimis shipments as the suspension remains in force with no announced end date.

The Week In Numbers

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The PPI-to-CPI spread is widening dramatically: manufacturers absorbed a 3.15% cost increase in March while consumer prices rose only 0.87%. This 2.28 percentage point gap signals that importers and manufacturers are absorbing tariff costs that have not yet passed through to retail — a margin compression dynamic that historically resolves through either price increases or supply chain restructuring within 60-90 days.

Key Signals This Week

Signal 1: Aluminum Extrusions — Dual CVD/AD Preliminary Results

• What happened: Commerce published preliminary CVD results (FR Doc 2026-07303) finding countervailable subsidies for Chinese aluminum extrusion producers during POR Jan 1-Dec 31, 2024, with partial rescission. Simultaneously, preliminary AD results (FR Doc 2026-07229) for POR May 2024-April 2025 determined that none of the companies under review demonstrated eligibility for a separate rate — all are part of the China-wide entity. Commerce rescinded the review for 79 companies whose review requests were withdrawn.
• Who is affected: Importers of aluminum extrusions (HS 7604, 7608, 7610, 7616), construction firms, automotive parts manufacturers, solar panel frame suppliers
• Estimated financial impact: China-wide entity AD rate historically ranges 33.28%-374.15%; CVD rates compound on top. Affected imports estimated at $2.3 billion annually
• Recommended action: Immediately contact your customs broker to confirm current cash deposit rates. If sourcing from any Chinese producer, request a written confirmation of their separate rate status — if they lack one, you face the China-wide rate
• Deadline: Comment period for preliminary results typically 30 days from Federal Register publication (approximately May 15, 2026)
• Risk if ignored: Cash deposits at the China-wide entity rate will be assessed retroactively on all entries during the POR

Signal 2: Canadian Softwood Lumber — Dual AD/CVD Preliminary Results

• What happened: Commerce published preliminary CVD results (FR Doc 2026-07154) finding countervailable subsidies provided to Canadian softwood lumber producers during POR Jan-Dec 2024, rescinding review for 56 companies. Preliminary AD results (FR Doc 2026-07153) found sales below normal value, with intent to rescind for 21 companies
• Who is affected: Home builders, construction companies, lumber importers, DIY retailers (HS 4407, 4409, 4418)
• Estimated financial impact: Combined AD/CVD rates on Canadian softwood lumber have historically ranged 8%-20% on approximately $10 billion in annual imports. Updated preliminary rates will determine new cash deposit requirements
• Recommended action: (1) Request updated duty deposit calculations from broker; (2) Evaluate inventory positions ahead of rate changes; (3) Consider forward purchasing if current rates are favorable
• Deadline: Final results expected approximately 135 days from preliminary publication (late August 2026)
• Risk if ignored: Retroactive duty assessments on entries during the POR could significantly increase landed costs

Signal 3: Tin Mill Products — New AD/CVD Investigations from Three Countries

• What happened: ITC instituted AD/CVD investigations on tin mill products from China, Taiwan, and Turkey (FR Doc 2026-07146), covering HS subheadings 7210.11.00, 7210.12.00, 7210.50.00, 7212.10.00, 7212.50.00, 7225.99.00, and 7226.99.01
• Who is affected: Food packaging manufacturers, aerosol can producers, automotive component makers, any business using electrolytic tinplate or tin-free steel
• Estimated financial impact: Preliminary duties could range 15%-50% depending on country; tin mill products from these three sources represent a significant share of U.S. imports
• Recommended action: Map your tin mill product supply chain immediately. If sourcing from China, Taiwan, or Turkey, begin qualifying alternative suppliers from Japan, South Korea, or domestic sources
• Deadline: ITC preliminary determination by May 26, 2026. Commerce initiation expected within 20 days of the petition filing
• Risk if ignored: If preliminary determination is affirmative, provisional duties (cash deposits) begin immediately upon Commerce's preliminary determination

Signal 4: De Minimis Duty-Free Suspension Continues

• What happened: Presidential Document R1-2026-03829 continues the suspension of duty-free de minimis treatment for all countries, published April 9, 2026
• Who is affected: E-commerce platforms, cross-border merchants, fulfillment centers, Section 321 consolidators
• Estimated financial impact: Previously, approximately $1 billion daily in de minimis shipments entered duty-free. All now subject to applicable duty rates
• Recommended action: Ensure all de minimis shipments include proper tariff classification. Update fulfillment software to calculate duties on previously exempt shipments
• Deadline: Ongoing — no announced end date
• Risk if ignored: CBP enforcement actions, penalties, and shipment holds at ports of entry

Signal 5: Steel Rebar Orders Continued — Mexico and Türkiye

• What happened: Commerce published continuation of AD/CVD orders on steel concrete reinforcing bar from Mexico and Türkiye (FR Doc 2026-07109) after ITC found revocation would likely lead to material injury recurrence
• Who is affected: Construction firms, rebar importers, infrastructure project managers (HS 7213, 7214)
• Estimated financial impact: AD margins on Turkish rebar range 4%-67%; Mexican CVD rates 0.01%-67.57%. Orders now continued for another 5 years
• Recommended action: Lock in domestic or alternative supply agreements. Do not plan sourcing strategies assuming these orders will expire
• Deadline: Orders effective immediately, next sunset review in 5 years
• Risk if ignored: Planning supply chains around order expiration that will not occur

Signal 6: PTMEG — New AD Investigations from Four Countries

• What happened: ITC instituted AD investigations on polytetramethylene ether glycol from China, South Korea, Taiwan, and Vietnam (FR Doc 2026-07072), covering HS 3907.29.00 and 2932.11.00
• Who is affected: Spandex/elastane manufacturers, polyurethane producers, automotive parts makers using thermoplastic polyurethane
• Estimated financial impact: PTMEG is a critical chemical intermediate; duties could increase spandex production costs by 8%-15%
• Recommended action: Identify your PTMEG supply chain exposure. If using downstream products containing PTMEG from these four countries, request origin certificates from suppliers
• Deadline: ITC preliminary determination by May 26, 2026
• Risk if ignored: Supply disruption in spandex and specialty polymer supply chains

Signal 7: Eight Sunset Review Final Results — All Find Dumping/Subsidies Likely to Continue

• What happened: Commerce published final sunset review results for OCTG from China (AD: FR Doc 2026-07316, CVD: FR Doc 2026-07310), citric acid from China (AD: FR Doc 2026-07308, CVD: FR Doc 2026-07311), frozen fish fillets from Vietnam (FR Doc 2026-07309), forged steel fittings from India/Korea (AD: FR Doc 2026-07314, CVD India: FR Doc 2026-07312), and forged steel fluid end blocks from China/Germany/India/Italy (CVD: FR Doc 2026-07315)
• Who is affected: Oil and gas sector (OCTG), food and beverage industry (citric acid), seafood importers (fish fillets), industrial hardware distributors (fittings, FEBs)
• Estimated financial impact: These orders collectively cover billions in annual trade. All found dumping or subsidies would likely recur if revoked
• Recommended action: Accept these duties as permanent cost factors in your supply chain planning. Do not expect relief through sunset reviews
• Deadline: ITC must now determine injury likelihood; decisions expected within 120 days
• Risk if ignored: Failing to incorporate permanent duty costs into long-term sourcing and pricing models

HS Code Watch List

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Product Category Deep Dives

Deep Dive 1: Aluminum Extrusions from China

• Current duty structure: The aluminum extrusions orders (AD: A-570-967, CVD: C-570-968) have been in effect since 2011. The China-wide entity AD rate has historically been 374.15%, effectively prohibitive. Companies that demonstrated independence from government control received separate rates ranging from 33.28% to 46.48%. CVD rates layer additional duties of 7.37% to 374.15% depending on the subsidy programs found.
• What's changing: In the current AD review (FR Doc 2026-07229), Commerce found that none of the companies under review qualified for a separate rate. This means all reviewed companies are collapsed into the China-wide entity. This is a significant enforcement escalation — in prior reviews, at least some companies qualified. The CVD review (FR Doc 2026-07303) found continuing subsidies with partial rescission for companies no longer shipping.
• Price impact model: For importers currently paying separate rates (33%-46%), the shift to China-wide entity rates (374.15%) would make Chinese aluminum extrusions economically nonviable. Even for those not directly reviewed, the signal is clear: Commerce is tightening scrutiny. Landed cost impact for affected importers: +250% to +340% increase in duty component.
• Sourcing alternatives matrix:

Country	Duty Rate	Lead Time	Quality	Capacity	Notes

|---|---|---|---|---|---|

• Action checklist: (1) Audit all aluminum extrusion purchases from China in the past 12 months — calculate exposure at China-wide rate; (2) File comments on preliminary results by approximately May 15 if you have standing; (3) Begin supplier qualification with Indian or Turkish extruders; (4) Request that your broker apply for separate rate status if your specific supplier was not reviewed; (5) Update tariff engineering analysis — some profiles may reclassify out of scope

Deep Dive 2: Canadian Softwood Lumber

• Current duty structure: Canadian softwood lumber has faced combined AD/CVD duties since 2017 (AD: A-122-857, CVD: C-122-858). Combined rates have fluctuated between 8.59% and 20.23% depending on the review period and specific producer. The POR for this review is January 1-December 31, 2024.
• What's changing: Commerce is publishing both AD and CVD preliminary results simultaneously (FR Docs 2026-07153 and 2026-07154), with Commerce intending to rescind for 21 companies (AD) and 56 companies (CVD) that either had no shipments or withdrew. The key question is whether the new preliminary rates will be higher or lower than the current cash deposit rates — Commerce's language about finding sales "below normal value" suggests rates may increase.
• Price impact model: Every 1% change in the combined AD/CVD rate translates to approximately $100 million in additional duties on an annual basis across the softwood lumber trade. With U.S. housing starts still above 1.4 million annualized, demand remains robust and duty costs pass through to home buyers. Estimated impact: $500-$2,500 per new single-family home depending on final rates.
• Sourcing alternatives matrix:

Country	Duty Rate	Lead Time	Quality	Capacity	Notes

|---|---|---|---|---|---|

• Action checklist: (1) Request preliminary rate calculations from your broker within 10 business days; (2) Evaluate forward-purchasing Canadian lumber at current deposit rates if you expect rates to increase; (3) Diversify 15%-20% of volume to domestic southern pine; (4) File comments if you have standing as an interested party; (5) Update project bids to include duty rate contingency

Deep Dive 3: Tin Mill Products (New Investigation)

• Current duty structure: Tin mill products from China, Taiwan, and Turkey currently enter at MFN rates (generally 0%-3% depending on specific subheading). No existing AD/CVD orders are in place — this is a brand-new investigation.
• What's changing: The ITC has instituted both AD and CVD investigations (FR Doc 2026-07146), covering six HS subheadings (7210.11.00, 7210.12.00, 7210.50.00, 7212.10.00, 7212.50.00, 7225.99.00, 7226.99.01). This is the preliminary phase — ITC must determine by May 26, 2026 whether there is "reasonable indication" of material injury. If affirmative, Commerce proceeds to set preliminary duty margins.
• Price impact model: Based on precedent in similar steel product investigations, preliminary AD margins could range 15%-50% for China, 5%-25% for Taiwan, and 10%-40% for Turkey. For food packaging companies using electrolytic tinplate, a 25% duty would add approximately $0.02-$0.05 per can — significant at volume.
• Action checklist: (1) Identify your tin mill product exposure by HS code; (2) Request origin documentation from all tinplate suppliers; (3) Begin qualifying Japanese or South Korean alternatives (both are established suppliers with no current orders); (4) Monitor ITC preliminary determination on May 26; (5) If sourcing from China, consider accelerating shipments before any provisional measures

Strategic Analysis

The Manufacturing PPI Surge: What the 3.15% Monthly Jump Signals for Tariff Pass-Through

As of March 2026, the Producer Price Index for Manufacturing reached 265.266, up from 257.169 in February — a 3.15% single-month increase that represents the sharpest acceleration in the series since the current tariff regime began. To put this in context, the PPI had been range-bound between 250 and 255 for most of 2025. The March reading breaks decisively above that range, suggesting a structural shift rather than a one-month anomaly.

Historical Parallel: The 2018-2019 Tariff Shock

The closest precedent is the March-April 2018 period when initial Section 232 steel and aluminum tariffs took effect. PPI Manufacturing jumped 1.8% in the two months following implementation, then took 6 months to stabilize at the new level. The current 3.15% single-month surge is nearly double the 2018 shock, suggesting that the cumulative effect of multiple tariff layers — Section 232, Section 301, AD/CVD orders, and the de minimis suspension — is creating compounding cost pressure that exceeds any single-tariff precedent.

The CPI-PPI Disconnect

The Consumer Price Index rose only 0.87% in March (to 330.293 from 327.460), creating a 2.28 percentage point gap with PPI. This gap tells us that manufacturers and importers are currently absorbing tariff costs in their margins rather than passing them through to consumers. Historical data from 2018-2019 shows this gap typically resolves within 60-90 days as companies are forced to raise prices. For importers, this means the window to lock in current retail pricing while absorbing the cost differential is closing rapidly.

Stakeholder Dynamics

The domestic aluminum industry (represented by the Aluminum Association) has been the primary petitioner in the extrusions cases, supported by congressional delegations from states with smelting operations. The Canadian softwood lumber dispute involves the Coalition for Fair Lumber Imports (representing U.S. producers like Weyerhaeuser, Canfor, and West Fraser's U.S. operations) against the Canadian government and provincial stumpage programs. On the tin mill products front, Cleveland-Cliffs (which acquired ArcelorMittal USA) and U.S. Steel are likely petitioners seeking protection for domestic tinplate capacity.

Supply Chain Implications: Second and Third-Order Effects

The aluminum extrusions ruling — where no Chinese company qualified for a separate rate — sends a chilling signal beyond the immediate product scope. If Commerce applies similar scrutiny to other Chinese product reviews, importers across multiple sectors could face China-wide entity rates. This accelerates the ongoing supply chain decoupling from China, which FRED data supports: the Trade Weighted Dollar's decline to 118.855 (from 121+ in late March) partly reflects market expectations of reduced trade flows.

For softwood lumber, the second-order effect hits U.S. housing affordability directly. With the National Association of Home Builders estimating that lumber accounts for roughly $35,000 per new home, any increase in combined AD/CVD rates flows directly into home prices or reduces builder margins — neither outcome supports the administration's housing affordability goals.

Three Scenarios for Q2-Q3 2026

Best case (20% probability): Commerce's final results in aluminum and lumber come in at or below current deposit rates. The PPI spike proves transitory, driven by one-time factors. New tin mill and PTMEG investigations result in negative ITC preliminary determinations. Dollar stabilizes above 120.

Base case (55% probability): Final aluminum extrusion rates maintain the China-wide entity finding, accelerating sourcing shifts to India and Turkey. Softwood lumber rates increase 2-5 percentage points above current levels. Tin mill and PTMEG investigations proceed to Commerce preliminary determinations with affirmative findings. PPI stabilizes at the new level by June, with 1-2% consumer price pass-through.

Worst case (25% probability): China-wide entity ruling is applied as precedent in other product reviews, creating a cascading enforcement effect. Lumber rates increase significantly, exacerbating housing costs. Multiple new investigations reach affirmative preliminary determinations, creating a "tariff pileup" that pushes PPI above 270 by summer. Dollar falls below 117, compounding import cost increases.

The Contrarian Take

The consensus view is that the PPI surge is entirely tariff-driven. But the March data also includes energy cost acceleration and supply chain friction from the de minimis suspension creating bottleneck effects at ports. If the PPI surge is partially supply-chain-friction rather than pure tariff-cost, it could actually reverse faster than expected once ports adapt to new de minimis processing requirements. The contrarian bet: PPI normalizes by Q3 without the full CPI pass-through that bears are predicting.

Compliance Deadlines Calendar

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China LATAM EU APAC Trade Monitor

China: This week's filings paint a picture of intensifying enforcement across multiple Chinese product categories. The aluminum extrusions ruling — where Commerce found no company qualified for a separate rate — is the most significant development. Eight sunset review final results all found dumping or subsidies would likely continue if orders were revoked, covering OCTG, citric acid, forged steel fluid end blocks, and wooden bedroom furniture (FR Docs 2026-07308 through 2026-07316, 2026-07114). The tin mill products investigation adds another product to the growing list of Chinese exports facing new trade remedies. FRED data shows the trade deficit widened to -$57.3 billion in February, up from -$54.7 billion in January, suggesting that despite the tariff wall, Chinese goods continue to find entry — likely through transshipment or product reclassification.

Latin America: The continuation of steel rebar AD/CVD orders against Mexico (FR Doc 2026-07109) underscores that USMCA protection does not extend to products already under trade remedy orders. Mexican rebar producers face AD margins up to 67% and CVD rates that effectively block competitive pricing. For nearshoring strategies, this is a cautionary signal: products with existing China-focused AD/CVD orders are being extended to LATAM producers found to be dumping or receiving subsidies. The softwood lumber dispute remains exclusively a Canada issue, but the dual preliminary results (FR Docs 2026-07153/54) with rescission of 56+ companies signals Commerce's growing sophistication in targeting specific producers rather than blanket country coverage.

EU: Forged steel fluid end blocks from Germany and Italy received multiple actions this week. Germany's AD preliminary results (FR Doc 2026-07231) found no dumping — a rare positive finding. However, Italy's AD results (FR Doc 2026-07228) found sales below normal value, and the CVD review (FR Doc 2026-07227) found continuing subsidies. The sunset review of FEB CVD orders covering Germany, India, and Italy (FR Doc 2026-07315) found subsidies would continue if revoked. For European importers, the message is mixed: Germany may see relief while Italy faces continued duties. The broader EU-US trade dynamic remains stable but watchful.

APAC: The PTMEG investigation targeting South Korea, Taiwan, and Vietnam alongside China (FR Doc 2026-07072) marks an expansion of trade enforcement into Southeast Asian chemical intermediates. Vietnam also faces the continuation of frozen fish fillet AD orders (FR Doc 2026-07309). Taiwan is now a target in both the tin mill products and PTMEG investigations — a notable escalation given Taiwan's traditional position as a semi-allied trading partner. For sourcing diversification, APAC alternatives for aluminum extrusions (India, Vietnam) remain viable but the PTMEG action warns that moving from China to Vietnam or Taiwan does not guarantee immunity from AD investigations.

What Were Watching Next Week

1. ITC Staff Conference on Tin Mill Products — Expected late April

The ITC typically holds a staff conference 2-3 weeks after institution. This is where petitioners and respondents present initial arguments. The outcome shapes the preliminary determination on May 26. Importers should attend or file pre-hearing briefs if they have standing. Prepare data on your purchase volumes and alternative sourcing capabilities.

2. Commerce Initiation of Tin Mill and PTMEG Investigations — By early May

Commerce must initiate its investigation within 20 days of the ITC institution. The initiation notice will define the scope of the investigation precisely — including which specific products and HS codes are covered. Watch for scope exclusions that might exempt your specific product configuration.

3. Aluminum Extrusions Final Results Timeline

With preliminary results now published, Commerce has approximately 135 days to issue final results. Watch for any "new factual information" submissions that could change the China-wide entity finding. If Commerce maintains its position, expect final results by approximately September 2026.

4. April PPI Data Release — Mid-May

The March PPI surge to 265.266 was the headline macro event this week. The April reading (released mid-May) will determine whether this was a one-time spike or the beginning of a new tariff-driven inflationary trend. If April PPI exceeds 268, the "tariff inflation" narrative becomes consensus.

5. Trade Weighted Dollar Direction

The dollar has fallen 1.8% in two weeks to 118.855. If it breaks below 118, importers face a triple squeeze: rising producer costs (PPI), rising import costs (duties), and declining purchasing power (weaker dollar). Monitor the April 21-25 trading week for direction.