Mexico Fentanyl Tariff Scope: Which Mexican Goods Are at 25 Percent in 2026

The February 2025 IEEPA-based 25 percent tariff on Mexican (and Canadian) goods, imposed under the fentanyl-trafficking emergency basis, sits in an unusual legal position in 2026. The V.O.S. Selections SCOTUS ruling that invalidated broader IEEPA-based reciprocal tariffs explicitly carved out narrow non-trade emergency uses. The fentanyl basis qualifies under that carve-out. The tariff survives.

This guide covers the scope of the surviving Mexico fentanyl tariff, the USMCA-qualifying exemption mechanics, the stacking rules with Section 232 and Section 301, and worked examples for typical lanes.

What the fentanyl tariff is

Executive Order on February 1 2025 invoked IEEPA emergency authority based on findings that fentanyl trafficking from Mexico into the US constitutes an unusual and extraordinary threat to US national security and foreign policy. The order imposed a 25 percent ad valorem tariff on all Mexican-origin imports as a coercive measure to pressure Mexico's anti-trafficking response.

Carve-outs in the original order:

• USMCA-qualifying Mexican goods.
• Specific energy products (some Mexican crude oil).
• Specific humanitarian goods.

The February 2026 SCOTUS ruling distinguished IEEPA's emergency authority (legitimate for narrow non-trade purposes like the fentanyl basis) from IEEPA's use as a general trade-policy instrument (invalidated for the reciprocal tariff program). The fentanyl tariff is on the legitimate side.

Scope

The 25 percent applies to:

• Any Mexican-origin shipment not qualifying under USMCA.
• All HTS lines (no commodity-specific carve-out beyond the original energy/humanitarian list).
• All importers regardless of size.

The 25 percent does NOT apply to:

• USMCA-qualifying Mexican goods (issued USMCA certificate of origin and producer documentation supporting qualification).
• Specific energy products carved out by the original order.
• Humanitarian shipments.

Worked example: non-USMCA-qualifying Mexican electronics

Mexican electronics assembly using Chinese PCBs and Chinese components. 100,000 USD shipment of HTS 8517.62.

USMCA qualification: fails the chapter 85 RVC test (Chinese components > 40 percent of value).

Effective rate 25.35 percent. The fentanyl tariff is the binding cost. Section 122 is suppressed at 0 percent due to the Mexico-USMCA framework relationship even though this specific shipment did not qualify under USMCA per-shipment rules.

Worked example: USMCA-qualifying Mexican-assembled inverter

Same Mexican plant but with USMCA-qualifying production (Mexican-sourced PCBs and components, satisfies chapter 85 RVC). 100,000 USD shipment of HTS 8504.40.

Effective rate 0.35 percent. USMCA qualification is the binary lever between 25 percent and 0 percent on Mexican imports in 2026.

Worked example: Mexican aluminum extrusion (non-USMCA, with Chinese billet)

100,000 USD of HTS 7604.21 from Mexican extruder using Chinese-smelt billet.

Effective rate 135 percent. When the underlying upstream metal is Chinese, the Mexican processing does not insulate from Section 232, Section 301, or ADCVD. Plus the Mexican fentanyl tariff stacks on top. The compounding makes this lane economically dead for Chinese-billet-routed product.

USMCA qualification path

For Mexican goods to escape the fentanyl tariff:

1. Tariff shift test or RVC test per the specific chapter. Chapter 85 inverters require 60 percent transaction value RVC. Chapter 87 vehicles require 75 percent RVC plus steel/aluminum 70 percent producer rule.

2. USMCA certificate of origin issued by producer, exporter, or importer. Per-shipment or annual blanket.

3. Supporting records retained 5 years. BOM with origin and value of each non-originating input, transaction or net cost documentation supporting the RVC computation.

If any one of these is incomplete, the goods default to non-USMCA treatment and face the 25 percent fentanyl tariff.

What importers should do

1. Audit Mexican supplier USMCA qualification. Get producer certificates for every USMCA claim. Verify BOM origin and value share.

2. Re-source Chinese inputs to Mexican or US producers where possible. The qualification gap is often a single Chinese-origin input pushing RVC below 60 percent.

3. Build dual-channel landed cost models. Same Mexican supplier, USMCA-qualifying vs non-qualifying shipment, dramatically different cost. The choice between paying for higher-cost USMCA-region inputs vs the 25 percent fentanyl tariff is a sourcing optimization problem.

4. Watch for fentanyl tariff modification. The administration has indicated the tariff could be reduced or eliminated if Mexico meets anti-trafficking benchmarks. Tracking through 2026 to 2027.

Run your Mexico entry now

The LandedFees calculator handles the fentanyl tariff treatment with USMCA qualification check, the Section 232 derivative split, and the Mexican-bilateral Section 122 suppression.

Calculate a Mexico entry

Section 122 status as of June 20 2026

The May 7 2026 Court of International Trade ruling in Oregon v. United States (consolidated with Burlap and Barrel v. United States) struck down the Section 122 proclamation. The Federal Circuit issued an administrative stay on May 12 2026, so CBP is still collecting the duty pending appeal. Importers paying now should preserve protest rights and refund claims in case the government loses on the merits. The underlying Section 122 authority sunsets July 24 2026 under the statutory 150-day ceiling, regardless of the appeal outcome, unless Congress extends or a fresh proclamation restarts the clock.

Citations

• Executive Order on Mexican fentanyl tariff February 1 2025: Federal Register
• V.O.S. Selections v. United States SCOTUS February 2026
• 50 USC 1701 et seq IEEPA statutory basis: https://www.law.cornell.edu/uscode/text/50/1701
• USMCA Annex 4-B rules of origin
• CBP CSMS guidance on fentanyl tariff implementation: CBP CSMS portal