Customs Law Reform · Import Regulations · Enforcement · Trade Policy
Mexico · United States · Global
Executive Summary | Reference Week 2:  12-01-2026
SEMUDMEX – Strategic Customs & Trade Advisory

1. Executive Overview

Mexico entered a new customs and trade enforcement cycle in 2026. The reform of the Customs Law, combined with stricter General Foreign Trade Rules (RGCE), expanded tariff measures and mandatory digital filings, has significantly increased compliance expectations for importers, exporters and customs brokers.

2. Customs Law Reform – Effective 01 January 2026

• Expansion of joint and several liability across the logistics chain. (Mexican Customs Law reform, DOF Nov-2025)

Liability now extends to importers, customs brokers, carriers and logistics operators, allowing authorities to recover duties and penalties from any party involved in the import operation.

SEMUDMEX Practical Risk Assessment: Companies are exposed to tax credits and penalties caused by third-party errors; contractual and compliance governance must be reinforced.

• Reinforced powers for customs audits, inspections and post-clearance reviews. (Mexican Customs Law reform, DOF Nov-2025)

Authorities may initiate broader audits after release, request expanded documentation and reassess duties and taxes.

SEMUDMEX Practical Risk Assessment: Higher probability of retroactive assessments and prolonged audits if documentation is incomplete or inconsistent.

• Stronger legal linkage between customs value, tariff classification and tax determination. (Mexican Customs Law reform, DOF Nov-2025)

Declared value must be consistent with tariff classification and origin; discrepancies enable tax reassessment.

SEMUDMEX Practical Risk Assessment: Errors may cascade across multiple entries, increasing cumulative exposure.

• Enhanced digital traceability and evidentiary requirements. (RGCE 2025–2026, SAT)

Importers must maintain structured, electronic and auditable records supporting customs declarations.

SEMUDMEX Practical Risk Assessment: Operational disruption and enforcement risk if digital files are not audit-ready.

3. Electronic Customs Value Declaration (eMV / MVE)

• Mandatory electronic filing of customs value declaration via VUCEM. (RGCE Rule 1.5.1, SAT)

Importers are directly responsible for transmitting valuation data and supporting documents using e.firma.

SEMUDMEX Practical Risk Assessment: Automated inconsistencies may trigger holds, audits and penalties.

4. Priority Compliance Risk Matrix (2026)

• Customs valuation inconsistencies. (SAT / ANAM enforcement priorities 2026)

Authorities prioritize valuation accuracy and consistency with commercial and transfer pricing documentation.

SEMUDMEX Practical Risk Assessment: Multi-year reassessments and significant tax exposure.

• Tariff classification and NICO errors. (Mexican Customs Law; RGCE 2026)

Incorrect classification directly impacts duties, permits and regulatory compliance.

SEMUDMEX Practical Risk Assessment: Retroactive duties, fines and shipment delays.

• Transit regime non-compliance. (Mexican Customs Law; RGCE)

Route deviations or deadline breaches may invalidate transit regimes.

SEMUDMEX Practical Risk Assessment: Cargo seizures and operational disruption.

• Incomplete or inconsistent digital customs file. (SAT digital enforcement model)

Incomplete electronic documentation may block clearance or trigger audits.

SEMUDMEX Practical Risk Assessment: Rejections, delays and enforcement actions.

5. Trade & Import Policy – Recent Developments

• Tariff increases for non-FTA imports effective 01-01-2026. (Federal Executive Decrees; Ministry of Economy)

Tariff rates ranging from 5% to 50% impact automotive, textile, steel and industrial sectors.

SEMUDMEX Practical Risk Assessment: Higher landed cost and retroactive exposure if origin or classification errors exist.

6. Enforcement & Operational Outlook

• Expanded digital monitoring and post-clearance enforcement. (ANAM operational communications)

Authorities intensify digital monitoring and coordination with tax enforcement units.

SEMUDMEX Practical Risk Assessment: Sustained scrutiny throughout 2026 requires proactive compliance models.