Transportation equipment is where Section 232 meets bilateral framework deals
Transportation equipment manufacturing — NAICS 336 (Transportation Equipment Manufacturing) — is the industry hub where the most distinct tariff authorities stack simultaneously. The dominant tariff layers attaching to this hub include Section 232 (for automobiles and auto parts under the September 2025 expansion), the MFN baseline (across all transportation-equipment chapters), bilateral deal rates (most notably the 2025 framework agreement with the European Union covering automotive finished vehicles), and Section 301 (for Chinese-origin transportation-component subheadings). The combined authority stack produces tariff outcomes that vary materially by sub-category and origin country.
The six primary product categories tracked here cover passenger vehicles (cars, SUVs, pickup trucks), auto parts and components (engines, transmissions, electronics modules, body panels), commercial trucks (medium-duty and heavy-duty trucks for commercial fleets), motorcycles and ATVs, aircraft and aircraft parts, and marine vessels and parts. Each draws on a distinct supplier-country profile and faces a distinct customs authority stack.
Section 232 automobiles and the 2025 proclamation
The Section 232 automobiles proclamation, effective September 27, 2025, applied a twenty-five percent duty on covered passenger-vehicle and auto-parts subheadings from most origin countries. The proclamation followed the legal framework of the 2018 steel and aluminum Section 232 actions but had been considered and shelved during the first Trump administration before being revived and formally enacted in the second administration's metals-and-transportation review cycle. The product scope as enacted covered finished passenger vehicles, light trucks, and a defined list of critical auto-parts subheadings — engines, transmissions, body stampings, and certain electronic-control modules.
The proclamation included specific country-exemption arrangements negotiated alongside the broader framework. The bilateral deal agreement with the European Union defined a tariff-rate quota structure for passenger vehicles from EU signatory countries at a fifteen-percent rate up to a defined annual quota volume; the structure operates as the bilateral-deal rate on this site's data model. Above-quota EU passenger vehicle shipments revert to the standard twenty-five-percent Section 232 rate. For Japanese, Korean, and other non-EU origins, the standard twenty-five-percent rate applies on all shipments. The Federal Register publishes the canonical proclamation text and the bilateral-deal companion documentation.
USMCA and the automobile rules-of-origin specificity
USMCA includes a chapter-specific rule of origin for automobiles that is the most complex in the agreement: the seventy-five percent regional value content requirement applies to finished passenger vehicles and light trucks produced in Canada or Mexico, with a parallel labour-value-content requirement that a defined share of the production labour cost must be paid at or above a specified wage threshold. The rule-of-origin determination for a USMCA-qualifying vehicle is therefore non-trivial and the qualifying status drives the customs outcome substantially. A USMCA-qualifying Mexican-assembled vehicle enters at zero MFN duty AND is carved out from the Section 232 automobile duty under the proclamation interpretation for USMCA-compliant production.
The USMCA carve-out from Section 232 for qualifying automobiles is the structural reason Mexican and Canadian auto production has remained central to the US passenger-vehicle market despite the broader Section 232 metals-and-vehicles framework. The labour-value-content requirement has shifted the production-labour cost structure across the US-Mexico automotive supply chain but has not displaced Mexican assembly capacity from the US market.
Auto parts and the substantial-transformation question
Auto parts under HTS Chapter 87 subheadings carry a more varied tariff treatment than finished vehicles. The Section 232 product scope for auto parts covers a defined list of critical-component subheadings rather than all auto-parts subheadings; the scope determination is published through the Department of Commerce administrative process. For parts inside the Section 232 scope, the twenty-five-percent duty attaches regardless of origin (subject to the USMCA and bilateral-deal carve-outs). For parts outside the Section 232 scope, only the MFN baseline plus any Section 301 layer applies.
The auto-parts supply chain is one of the most geographically integrated industrial supply chains in the world, with components crossing the US-Mexico-Canada border multiple times during a typical vehicle production cycle. The USMCA rule-of-origin determination has to track the cumulative regional value content across these cross-border movements, which makes the parts-level compliance work substantially more burdensome than the finished-vehicle compliance work. The Department of Commerce publishes guidance on the audit-trail requirements that vehicle and parts manufacturers must maintain to substantiate USMCA qualifying status.
Aircraft, marine, and the non-Section-232 categories
Aircraft and aircraft parts fall under HTS Chapter 88 with a structurally different tariff profile from automotive categories. The MFN duty on most civil aircraft and parts subheadings is zero under the WTO Civil Aircraft Agreement, which covers large commercial aircraft, smaller general-aviation aircraft, and a wide range of aircraft parts. The agreement coverage is the reason the aircraft category appears as a relatively low-tariff segment within this hub. Section 232 does not extend to aircraft. Section 301 does attach to certain Chinese-origin aircraft-component subheadings — primarily lower-value avionics components and certain aircraft furnishings — but the aircraft category overall sees minimal Section 301 exposure.
Marine vessels and marine parts under HTS Chapter 89 carry a similarly low MFN duty profile for most subheadings. The Jones Act constraints on US coastal-shipping vessel sourcing sit alongside but do not affect the customs duty treatment; the Jones Act governs the registry, crewing, and ownership of vessels operating in US coastal trade rather than the customs duty on vessel imports. Section 232 does not extend to marine vessels, and Section 301 attaches to certain Chinese-origin marine-component subheadings but not to finished vessels at scale.
Motorcycles and ATVs
Motorcycles under HTS subheading 8711 and all-terrain vehicles under related subheadings carry MFN duties between zero and a few percent depending on engine displacement and configuration. The dominant supplier-country profile is Japan (Honda, Yamaha, Kawasaki, Suzuki), Europe (BMW Motorrad, KTM, Ducati, Triumph), and increasingly Indian-origin (Royal Enfield, Bajaj). Chinese-origin motorcycle and ATV supply is meaningful in the lower-cost commodity-equipment segment with the Section 301 List 1 layer attaching to those subheadings. The EU bilateral deal framework includes motorcycle subheadings within its scope for European-origin shipments, modifying the effective rate from MFN to the bilateral-deal rate.
Section 122 surcharge in the transportation-equipment hub
The February 2026 Section 122 ten-percent surcharge excludes products already subject to Section 232 — automobiles and auto parts in this hub. For aircraft and marine vessels, the Section 122 surcharge attaches as a flat ten-percent layer on top of the MFN baseline unless an exemption applies. The exemption list carved out certain critical-defence-industrial-base transportation equipment but did not exempt the broader commercial aircraft and marine segments. For Chinese-origin transportation-component subheadings outside the Section 232 scope, the combined rate is the MFN baseline plus Section 301 List 1 plus Section 122.
NHTSA safety standards and the import-enforcement interaction
The National Highway Traffic Safety Administration enforces Federal Motor Vehicle Safety Standards (FMVSS) on imported passenger vehicles and certain commercial truck categories. The FMVSS framework operates independently of the customs duty schedule but adds a regulatory compliance layer that vehicle importers must satisfy before the imported vehicle can be sold to US consumers. The framework requires importer-of-record certification that the vehicle meets the applicable FMVSS for the model year, with documentation retained for the statutory period. NHTSA can refuse entry of non-compliant vehicles even after customs clearance, and the agency can issue recall orders on imported vehicles that develop safety defects after market introduction.
For grey-market vehicle imports — vehicles produced for foreign markets that do not meet US FMVSS as built — the NHTSA framework allows entry only through a registered-importer modification process that brings the vehicle into FMVSS compliance through specific modifications. The grey-market import channel has narrowed materially across the past two decades as FMVSS divergence from foreign safety standards has widened. For mainstream import-vehicle channels, the manufacturer's homologation process ensures FMVSS compliance at the build stage, eliminating the post-import modification burden. The interaction between FMVSS enforcement and the Section 232 automobile tariff is independent: a vehicle can clear customs at the 25 percent Section 232 rate but still face NHTSA refusal of market introduction if not FMVSS compliant.
How to verify a specific transportation-equipment rate
The verification workflow is the most complex in this site's coverage because the multiple authorities require sequential checks: identify the HTS Chapter 87, 88, or 89 subheading in the USITC HTS Online Reference Tool; confirm the column-one general MFN rate (typically zero for civil aircraft under WTO agreement); check Section 232 automobile-scope applicability; check USMCA qualifying status for Canadian or Mexican origin (with the regional-value-content and labour-value-content rules for automobiles specifically); check bilateral-deal rate modification for EU and other signatory origins; check Section 301 attachment for Chinese origin; layer in Section 122 unless Section-232-covered, USMCA-qualifying, or exemption-listed. The USITC DataWeb tariff database cross-references the rate against actual customs collections by quarter, and the BLS QCEW industry index for NAICS 336 provides the employment and establishment baseline. Given the multi-authority stacking in this hub, an importer-of-record handling cross-border vehicle or auto-parts shipments typically maintains a dedicated trade-compliance team rather than relying on general-purpose customs-broker support, because the sequential verification across Section 232, USMCA, bilateral-deal, Section 301, and Section 122 demands category-specific expertise that scales with shipment volume.
