The 2026 tariff playbook: layered overlays, real exposures

The stack, not the rate #

The US import-duty figure that matters in 2026 is almost never the column 1 MFN rate from the Harmonized Tariff Schedule. For any sensitive product, the applied rate is the sum of MFN, plus a Section 301 List 1 through List 4A duty if the origin is China, plus a Section 232 steel or aluminum duty if the input is in scope, plus an antidumping duty if a USITC order is in force, plus a countervailing duty if a Commerce subsidy finding applies, plus any IEEPA-based fentanyl or border duty in effect. In several product lines the applied rate exceeds 100 percent before any quota or content overlay.

This is not a hypothetical complication. CBP ACE entry summary data for 2025 showed that the average effective tariff rate across all US goods imports rose to roughly 7.8 percent of customs value, up from 1.5 percent in 2017, per US Treasury Department customs receipts and Census Bureau import value data. For products subject to two or more overlays, applied rates routinely landed above 30 percent. The Peterson Institute for International Economics maintained a running tracker through 2024 and 2025 putting the China-origin weighted average tariff above 40 percent.

The right exercise for a treasury team or a sourcing organization is not to memorize the rate. It is to walk the stack overlay by overlay, identify which one binds for the product, and quantify pass-through under realistic supplier and customer responses. This brief does that walk.

Where rates sit today #

The table below summarizes the six overlays currently active for US imports, with the legal basis, the agency of record, and the effective duty band that applies to in-scope HS lines. All figures trace to public USTR, Commerce, USITC, CBP, or Federal Register sources.

Section 301 list state in 2026 #

The Section 301 China program closed its statutory four-year review in May 2024 and the USTR finalized increases on a defined list of strategic categories on September 13, 2024. The Federal Register notice (89 FR 76581) raised duties on electric vehicles to 100 percent, lithium-ion EV batteries to 25 percent, lithium-ion non-EV batteries to 25 percent (effective January 1, 2026), solar cells (whether or not assembled into modules) to 50 percent, syringes and needles to 50 percent (after a delay to September 2025), permanent magnets to 25 percent (effective January 1, 2026), semiconductors to 50 percent (effective January 1, 2025), ship-to-shore cranes to 25 percent, and several PPE categories.

The exclusion process remains narrow. The most recent USTR exclusion extension covered 164 product exclusions and 14 COVID-related exclusions, with most extended to May 31, 2025 and a subset to August 31, 2025 per USTR notices. New machinery exclusions for 19 subheadings related to solar manufacturing equipment expired in May 2025 and were not renewed. As of the spring of 2026, importers operating without an active exclusion pay the full stacked rate.

List coverage has been remarkably stable since 2019. List 1 covers approximately 818 HS8 lines at 25 percent, List 2 covers 279 lines at 25 percent, List 3 covers 5,757 lines at 25 percent, and List 4A covers 3,233 lines at 7.5 percent per the original USTR notices and subsequent modifications. The 2024 to 2026 increases sit on top of these lists rather than replacing them. A given Chinese-origin import can therefore carry the original 25 percent List 3 duty plus a 100 percent EV uplift if it falls in HTS 8703.80.00, plus the 25 percent Section 232 aluminum derivative duty if the body shell is aluminum, plus an antidumping duty if a Commerce order applies.

IRA Section 48D and Section 30D content rules #

The Inflation Reduction Act introduced two domestic-content overlays that interact with the tariff stack rather than sitting next to it. Section 30D, the clean vehicle credit, conditions a 7,500 dollar per-vehicle credit on critical minerals and battery component sourcing tests. The IRS final regulations (TD 9995, published May 6, 2024) set the foreign entity of concern (FEOC) rule that took effect for battery components on January 1, 2024 and for applicable critical minerals on January 1, 2025. As of 2026, a vehicle whose battery contains any FEOC-sourced component or applicable critical mineral is fully ineligible for 30D, even if every other content threshold is met.

FuelEconomy.gov publishes the running list of 30D-eligible vehicles. As of the April 2026 update, the list contained 25 to 30 vehicle configurations across roughly 14 nameplates, down from over 70 configurations in the first half of 2024. The drop reflects FEOC enforcement: most Korean and Japanese battery cells contain Chinese precursor materials, and reformulating supply chains to comply has run on a multi-year clock.

Section 48D, the Advanced Manufacturing Investment Credit administered by Treasury and Commerce CHIPS, provides a 25 percent credit for qualifying semiconductor manufacturing facility investment. The IRS final regulations (TD 10009, published October 23, 2024) defined applicable taxpayer, advanced manufacturing facility, and the FEOC clawback. A taxpayer that engages in a significant transaction involving the material expansion of semiconductor manufacturing capacity in a foreign entity of concern within 10 years of placing the property in service forfeits the entire credit. The regulations are explicit: the clawback is the full credit, not a prorated share.

The Section 45X advanced manufacturing production credit, which is the IRA companion for components and minerals rather than facilities, has been the main new overlay for battery and solar component supply. Treasury final regulations (TD 10010, October 28, 2024) defined the per-unit credit amounts and the related-party rules. For the trade analytics that matter, 45X creates a domestic price floor that competes directly with imported equivalents, and the 30D and 48D FEOC rules act as origin filters that no MFN tariff alone can replicate.

USMCA review window approaching #

The most consequential single trade-policy date in 2026 is July 1. Article 34.7 of the USMCA establishes a joint review of the agreement six years from entry into force, which puts the first review squarely in the second half of 2026. If the three parties do not jointly confirm the agreement, USMCA enters a 10-year sunset clock and annual reviews continue until either confirmation or termination at year 16. The mechanism is procedural, not substantive, but it gives any party a structured opening to demand renegotiation.

USTR launched the public consultation process on the joint review through a Federal Register notice published in early 2026, with public hearings scheduled and a request for comments on rules of origin enforcement, labor compliance under Annex 23-A and the Rapid Response Mechanism, and the auto sector regional value content rules. The auto rules of origin are the obvious flashpoint: USMCA requires 75 percent regional value content for passenger vehicles and light trucks (up from 62.5 percent under NAFTA), with separate Labor Value Content tests requiring at least 40 percent of vehicle content from operations paying at least 16 dollars per hour.

USITC publishes the data that lets an outside analyst measure the stakes. US imports from Mexico totaled 506 billion dollars in 2024 per Census FT900, with autos and parts (HS 8703 and 8708) representing roughly 88 billion dollars. US imports from Canada totaled 419 billion dollars, with energy and autos the two largest categories. A failure to confirm USMCA at the July 2026 review would not snap tariffs back to MFN immediately, but it would shift the legal posture of every cross-border supply chain from open-ended to time-limited, with implications for capital allocation in the affected sectors over the next decade.

The IEEPA-based February 2025 fentanyl and border duties on Canadian and Mexican imports already function as a soft preview. The 25 percent IEEPA duties on non-USMCA-qualifying imports from Canada and Mexico, combined with a 10 percent rate on Canadian energy resources, were imposed under presidential proclamations citing the IEEPA and the National Emergencies Act. The legal challenges are working through the Court of International Trade and the Federal Circuit, but the operational effect is that USMCA qualification has become more financially valuable, not less, in the run-up to the July 2026 review.

Section 232 metals reviews #

Section 232 of the Trade Expansion Act of 1962 authorizes the Commerce Department to recommend tariffs or quotas on imports that threaten national security. The original 2018 actions imposed 25 percent on steel and 10 percent on aluminum. The February 10, 2025 presidential proclamations raised aluminum to 25 percent and eliminated nearly all country exemptions and product exclusions, including the tariff rate quota arrangements with the EU, Japan, and the UK. As of April 2026, the operative rate is 25 percent on essentially all steel and aluminum imports, with a derivatives expansion that brought downstream products like aluminum cans, structural steel components, and certain fabricated parts into scope.

The derivatives list runs to several hundred HTS lines and has been the largest 2025 shift. CBP issued multiple Cargo Systems Messaging Service notices through Q1 2026 implementing the new HTS chapter 99 subheadings (9903.85.07 and 9903.81.93 series) that capture in-scope derivatives. Importers of products as varied as automotive subassemblies, prefabricated building components, and beverage cans now face the 25 percent overlay on top of the underlying duty.

The 232 program also covers separate active investigations. Commerce initiated a Section 232 investigation into semiconductors and semiconductor manufacturing equipment in April 2025 (Federal Register, April 16, 2025), into pharmaceuticals in April 2025, into copper imports in February 2025, and into timber and lumber in March 2025. Commerce has 270 days to deliver findings, and the President has 90 days after to act. A 232 action on semiconductors would land directly on top of the existing Section 301 50 percent uplift on Chinese-origin chips, with the practical effect of pulling in non-China origins for the first time.

Antidumping order book activity #

The antidumping and countervailing duty system operates parallel to the policy-driven overlays above and is the most product-specific layer. The USITC maintains the AD CVD orders database, which as of the first quarter of 2026 listed approximately 720 active orders covering 41 trading partners. Orders typically run for five years, then enter sunset review where Commerce and the USITC determine whether revocation would lead to recurrence of injury. The vast majority of orders are extended at sunset.

China dominates the order book. As of early 2026 China accounted for roughly 230 active orders, followed by India at approximately 50, South Korea at approximately 45, Taiwan at approximately 35, and Vietnam at approximately 30 per USITC AD CVD orders database extracts. Steel and aluminum products account for roughly 35 percent of all active orders, chemicals for approximately 20 percent, and a long tail of agricultural, machinery, and consumer goods makes up the balance.

Order activity in 2025 ran heavy. Commerce initiated approximately 90 new AD or CVD investigations in calendar 2025 per the Federal Register, the highest annual count since 2001. Petitioners increasingly target third-country transshipment and circumvention. Commerce affirmative circumvention findings on solar cells from Cambodia, Malaysia, Thailand, and Vietnam (originally a 2023 finding extended through 2025 enforcement) and on aluminum extrusions through multiple third countries have compressed the channels by which Chinese-origin product can reach the US without triggering the China-origin duty stack.

The treasury implication is that AD CVD rates are not capped. Final affirmative determinations have set rates above 400 percent in multiple cases (steel wire rod from China, certain solar cells, aluminum extrusions). For procurement teams the AD CVD layer requires HTS-level checking against the USITC database every quarter. The rates change at administrative review (typically annual) and the country and supplier-specific rates can vary widely within the same case.

BIS export controls on advanced semiconductors #

Export controls operate on the outbound side of the trade flow but reshape the import side because they constrain what foreign customers can buy and therefore what global suppliers will produce. The Bureau of Industry and Security (BIS) has run the most consequential expansion of export controls since the Cold War over the 2022 to 2025 window, focused on advanced semiconductors and the equipment that makes them.

The October 7, 2022 interim final rule imposed the original framework. The October 17, 2023 update tightened the technology thresholds and added country scope. The December 2, 2024 interim final rule (89 FR 96790) expanded controls on semiconductor manufacturing equipment, added high-bandwidth memory (HBM) controls, added 140 entities to the Entity List including major Chinese fab equipment makers, and tightened the Foreign Direct Product Rule footprint. The January 13, 2025 framework on Artificial Intelligence Diffusion (90 FR 4544) introduced a tiered country structure for advanced AI chip exports, with Tier 1 allies effectively unrestricted, Tier 3 destinations (China, Russia, Iran) blocked, and Tier 2 (most of the world) under licensing thresholds.

The January 15, 2025 final rule on advanced computing items added a per-die compute threshold and validated end user requirements for Tier 2 destinations. As of April 2026, the rule remains in effect and BIS has issued FAQs and additional Entity List actions through Q1 2026. The Court of International Trade has not yet ruled on pending challenges from chip equipment makers.

For the trade flow the export-control overlay shows up in two places. First, US shipments of HS 8486 (semiconductor manufacturing equipment) to China dropped from a peak monthly average of approximately 600 million dollars in early 2022 to approximately 110 million dollars by the end of 2025 per Census USA Trade Online. Second, Chinese imports of advanced logic chips from Korea and Taiwan have shifted toward older nodes that fall outside the BIS technology thresholds. The result is a bifurcated chip market with a US-aligned advanced-node supply chain and a China-centered legacy-node supply chain, which has direct implications for downstream tariff incidence in 2027 and beyond.

Pass-through math under three stylized scenarios #

The right way to think about tariff incidence is not the headline rate. It is the share of the duty that lands on the importer, the share absorbed by the foreign exporter through price cuts, and the share that reaches the US consumer or downstream business. The empirical literature from the 2018 to 2019 China tariffs (Amiti, Redding, and Weinstein 2019; Cavallo, Gopinath, Neiman, and Tang 2021; Fajgelbaum, Goldberg, Kennedy, and Khandelwal 2020) converged on a near-complete pass-through to US prices for the affected product lines, with limited absorption by foreign exporters. The 2024 to 2025 actions have shown a similar pattern in early data, though the magnitude varies by product category.

Three stylized scenarios make the math concrete. Scenario A: a 25 percent Section 301 List 3 duty on a Chinese-origin consumer electronics input with three available origin substitutes (Vietnam, Thailand, Mexico) and one US-origin substitute. With supplier elasticity high and the Vietnam alternative roughly 8 percent more expensive at landed cost, the empirical pattern is that roughly 40 percent of imports shift to Vietnam over 18 months, the remaining China imports take the full duty pass-through to invoice price, and the importer's blended landed cost rises by approximately 13 percent. The downstream price increase depends on margin compression at the importer (typically 2 to 4 percentage points), with the residual passed to the customer.

Scenario B: a 100 percent Section 301 EV duty on a Chinese-origin EV. With no US-market price tolerance for a doubling of CIF cost, the trade flow effectively goes to zero and the China-origin share of US EV imports collapses, as it has in the 2024 to 2025 trade data. Pass-through is undefined because the volume disappears. The economic incidence shifts to the consumers who would have purchased the displaced model and now buy a more expensive substitute. This scenario is a quota in tariff form.

Scenario C: a 25 percent Section 232 aluminum derivative duty on a fabricated component used in commercial HVAC manufacturing. Supplier substitution is constrained by qualification cycles measured in 12 to 24 months, US capacity is below domestic demand, and the importer faces a near-term choice of absorbing the duty or passing it through. Margin data from the 2018 to 2020 episode showed roughly 70 to 90 percent pass-through within two quarters in business-to-business industrial inputs, with margin compression for two to three quarters in the interim. The downstream HVAC system price rise translates to a 1.5 to 2.5 percent increase, depending on aluminum content share.

How the overlays connect #

The six overlays are not independent. A Section 301 EV duty at 100 percent transforms the IRA Section 30D credit calculation by removing Chinese-origin EVs from the eligible set whether the FEOC rule binds or not. A Section 232 aluminum derivative duty raises the cost basis of the same battery pack housings that are subject to 30D content tests. An antidumping order on Vietnamese solar cells closes the substitution channel that was opened by the Section 301 List 3 duty on Chinese solar cells. A BIS export-control restriction on semiconductor manufacturing equipment reduces foreign capacity expansion, which over a multi-year horizon raises the global price of advanced chips that face the Section 301 50 percent uplift on the import side.

For procurement and treasury teams, the practical implication is that scenario modeling at the headline-duty level produces wrong answers. The right unit of analysis is the supplier, the HTS line, and the 24-month forward calendar of statutory action: AD sunset reviews scheduled in the relevant case, Section 232 investigation deadlines, USTR exclusion expirations, and the July 2026 USMCA joint review. A model that does not carry these dates carries a noisy version of the actual operating reality.

What changes the read #

Three categories of news would force a reassessment of the framework above.

Tighter overlays. A Section 232 affirmative determination on semiconductors, pharmaceuticals, copper, or timber would add a new horizontal overlay. A new Section 301 investigation outside the China context (the 2024 maritime action against China set a template). An adverse USMCA review outcome that triggers the sunset clock and shifts cross-border supply chains into a 10-year wind-down posture. Any of these events would reset the operating duty stack for affected sectors.

Looser overlays. A USTR machinery exclusion process that genuinely opens the relief valve for capital equipment imports needed for US capacity expansion. A Court of International Trade or Federal Circuit ruling that narrows the IEEPA-based February 2025 duties. A USMCA joint review that confirms the agreement and resets the sunset clock to year 16, removing the cross-border capital allocation overhang. None of these is the central case as of April 2026, but each is on the policy calendar.

Enforcement intensity. CBP enforcement of country-of-origin and transshipment compliance has tightened materially under the 2025 actions. The Uyghur Forced Labor Prevention Act detentions have remained elevated through Q1 2026 per CBP statistics, and the rebuttable presumption against XUAR-linked imports has expanded into adjacent supply chains. A meaningful change in enforcement intensity (either direction) would change the effective duty rate for any sourcing organization that touches the affected supply chains, even with no statutory change.

What this means for trade and treasury teams #

Three working assumptions follow for sourcing leads, treasury teams, and tariff engineering counsel planning the second half of 2026.

One. The headline duty rate is the wrong unit of analysis. The right unit is the stacked applied rate at the HTS-line and origin level for a specific supplier, refreshed at least quarterly against the USITC AD CVD orders database, the USTR Section 301 exclusion list, the CBP CSMS notices for Section 232 derivative scope changes, and the IRS Section 30D and 48D guidance.

Two. The substitution math drives incidence. A duty with available supplier substitutes within a 12 to 18 month qualification window has materially different pass-through than a duty on a constrained input. Investment in supplier qualification for the second-source origin is a tariff hedge, with measurable expected value when the duty differential is greater than the qualification cost amortized over the expected use period.

Three. The policy calendar matters as much as the rate. The July 2026 USMCA joint review, the rolling Section 232 investigation deadlines through 2026, AD sunset reviews on the 720-order book, and the BIS export-control deadlines for the AI Diffusion framework all sit on a published calendar. Risk and treasury teams that maintain that calendar as a first-class input have a meaningful information edge over teams that watch headline announcements.

TradeWeave, the platform behind this analysis #

The brief above is built on TradeWeave, the consultancy's trade and tariff analytics platform. TradeWeave pulls the USTR Section 301 list and exclusion data, the USITC AD CVD orders database, CBP ACE and CSMS notices, Census USA Trade Online and BACI bilateral trade panels, BIS export-control entity lists, IRS Section 30D and 48D eligibility data, and the WITS tariff-line repository on their native release cadences. It normalizes them, ties them to client-specific HTS-line and supplier exposure maps, and produces stacked applied-rate dashboards plus pass-through scenarios. Subscribers receive monthly readouts on the six overlays plus a configurable set of additional monitors. Custom modules cover Section 232 investigation tracking, USMCA qualification scoring, IRA FEOC compliance mapping, and pre-litigation modeling for AD CVD petition risk. Reach out via /engage to scope a deployment for your team.

Sources #

• USTR Section 301 Final Modification Notice, 89 FR 76581 (Sept 18, 2024)
• USITC Antidumping and Countervailing Duty Orders database
• USITC DataWeb (US international trade statistics)
• CBP Cargo Systems Messaging Service (CSMS) notices
• CBP ACE (Automated Commercial Environment) reports
• BIS Commerce Control List and Entity List, advanced computing rules
• BIS December 2, 2024 interim final rule, 89 FR 96790
• BIS Framework for Artificial Intelligence Diffusion, 90 FR 4544 (Jan 15, 2025)
• IRS Section 48D Advanced Manufacturing Investment Credit, TD 10009
• IRS Section 30D Clean Vehicle Credit final regulations, TD 9995
• IRS Section 45X Advanced Manufacturing Production Credit, TD 10010
• FuelEconomy.gov list of 30D-eligible clean vehicles
• Commerce Section 232 actions and pending investigations
• White House February 10, 2025 proclamations on steel and aluminum
• US Census FT900 monthly trade balance release
• US Census USA Trade Online
• USMCA text, Article 34.7 review and term extension
• Federal Register, USTR notices and Commerce ITA AD CVD initiations
• Peterson Institute for International Economics tariff trackers
• Amiti, Redding, and Weinstein, NBER Working Paper 25672 (2019)
• Fajgelbaum, Goldberg, Kennedy, and Khandelwal (2020), QJE
• Cavallo, Gopinath, Neiman, and Tang (2021), AER Insights
• WITS World Bank tariff and trade data
• CEPII BACI harmonized bilateral trade database