PAMA Customs Seizure in Mexico: Articles 150–155 & the 10-Day Defense Window
In cross-border manufacturing, few emergencies escalate to the US C-suite faster than a PAMA (Procedimiento Administrativo en Materia Aduanera). Governed by Articles 150 through 155 of the Mexican Customs Law (Ley Aduanera), a PAMA is triggered when Mexican customs officers (ANAM at a border port of entry) or federal trade auditors (AGACE during a factory visit or highway check) execute a precautionary seizure (embargo precautorio) of your cargo, raw materials, or production machinery.
Once the official initiation record (Acta de Inicio de PAMA) is served, a non-extendable 10-business-day statutory clock begins ticking. Understanding the exact legal triggers under Article 151, how to prove legal stay under Article 146, and how to release seized assets using an Article 154 guarantee determines whether your plant loses a $500,000 CNC machine permanently or resolves the audit cleanly.
1. The 7 Statutory Triggers for a PAMA Seizure (Article 151 of the Customs Law)
Customs authorities cannot seize merchandise for minor clerical typos (those are handled via the non-seizure administrative proceeding known as a PACO under Article 152, which only carries monetary fines). Under Article 151 of the Mexican Customs Law, authorities are legally mandated to execute a precautionary seizure (embargo precautorio) in seven specific situations:
| Article 151 Section | Statutory Trigger | Typical Real-World Scenario in US-Mexico Operations |
|---|---|---|
| Section I | Merchandise introduced through an unauthorized place, or diverted from its authorized fiscal transit route. | A carrier diverts an in-bond transit shipment (T3/T7) off the authorized federal corridor. |
| Section II | Prohibited goods or goods subject to Non-Tariff Regulations and Restrictions (RRNA) or Official Mexican Standards (NOMs) of commercial/safety compliance without the required permit or certificate. | Importing medical, telecom, chemical, or steel goods without the prior VUCEM permit (C1/C6 Automatic Steel Notice, COFEPRIS, or SEDENA) or required safety NOM. |
| Section III | Failure to prove legal importation, stay, or possession (legal estancia o tenencia) of foreign merchandise in Mexico under Article 146, or undeclared excess quantity > 10% found at the border. | Trigger A (Border): Red light (Reconocimiento Aduanero) in Laredo discovers 1,200 pieces on the trailer when the pedimento only declared 1,000 pieces (+20% undeclared surplus). Trigger B (Factory Floor): AGACE auditors inspect an IMMEX plant and find a CNC machine or injection mold whose physical serial number plate is missing or does not match the serial number on the AF pedimento. |
| Section IV | Undervaluation of 50% or more compared to the transaction value of identical or similar goods. | Declaring scrap or nominal $1.00 values on high-value consigned machinery or electronics without commercial valuation backing. |
| Section VI | False or non-existent supplier/importer domicile, or forged invoice: The overseas supplier address or domestic importer tax domicile declared on the pedimento or invoice cannot be located or does not exist. | Broker declares an outdated or non-existent overseas shipper address on the COVE, or the Mexican plant stores IMMEX inventory in an unregistered warehouse not registered in VUCEM (Article 24 IMMEX Decree). |
| Section VII | Undervaluation of 50% or more on goods subject to estimated reference prices (precios estimados by SHCP) without posting the required Customs Guarantee Account (Cuenta Aduanera de Garantía). | Importing footwear, textiles, or regulated goods below SHCP reference prices without a guarantee deposit. |
(Note: Under the final paragraphs of Article 151, in cases of Sections I, II, III, IV, VI, and VII during border clearance or transit, the tractor and trailer transporting the merchandise are also seized as a guarantee of the fiscal interest, unless the carrier presents the valid CFDI with Carta Porte 3.1 supplement enabling release of the vehicle under RGCE Rule 3.7.14).
2. Why US-Consigned Machinery (AF) Is the #1 Target in Factory PAMAs
When AGACE conducts a domiciliary audit (visita domiciliaria) at an IMMEX plant under Article 42, Section III of the Federal Fiscal Code (CFF), the auditors do not start in the accounting office. They walk straight onto the production floor with clipboards and cameras, select 30 to 50 pieces of machinery, robots, testers, and injection molds, and photograph their physical metal data plates (placas de identificación).
Then they ask the plant to produce the legal stay documentation required by Article 146 of the Customs Law (AF or A1 import pedimento + COVE + Anexo 24 Fixed Asset entry). A PAMA seizure on the factory floor is immediately initiated on any machine that fails one of these four checks:
- Missing or Painted-Over Data Plate: The machine arrived from a sister plant in Ohio 5 years ago without a metal nameplate showing Brand, Model, and Serial Number.
- Serial Number Mismatch: The physical plate on the press reads Serial
SN-884920-B, while theAFpedimento appendix or COVE reads884920(omitting the suffix) orS/N(Sin Número). - Unbilled Auxiliary Components: The
AFpedimento describes"1 Injection Molding Machine", without listing the separate serial numbers of the auxiliary chiller, hopper dryer, and robotic arm bolted next to it. - Unregistered Warehouse / Sub-Plant Location: The machine is physically operating at Building B across the street, which the company leased 6 months ago but forgot to register as an authorized IMMEX domicile in VUCEM and before SAT.
When AGACE places a machine under PAMA inside a factory, they often appoint the plant’s legal representative as the legal depositary (depositario) under Article 153 of the CFF, placing official SAT seals on the asset. Removing, selling, or relocating an asset under precautionary seizure without authorization is a federal felony (delito de depositaria infiel) under Article 112 of the CFF.
3. The Statutory Timeline of a PAMA (Articles 150, 153, and 155)
Every PAMA follows a rigid statutory calendar where missing a deadline by a single day forfeits your legal defense rights:
| Stage | Legal Basis | Statutory Deadline | Critical Action for the Importer & Legal Counsel |
|---|---|---|---|
| 1. Seizure & Initiation Record (Acta de Inicio de PAMA) | Art. 150 Customs Law | Day 0 (At the border dock or during the factory audit) | The official record must state the authority’s competence, the exact facts, the inventory/condition of seized goods, require the importer to designate two witnesses and a tax domicile for notifications, and explicitly inform the importer of the 10-day defense window. |
| 2. The 10-Day Defense Window (Ofrecimiento de Pruebas y Alegatos) | Art. 150 & Art. 153 Customs Law | 10 Business Days (Días Hábiles) from the day after notification takes effect | Your single most critical filing: Submit a formal legal brief accompanied by certified customs dossiers, R1 rectifications (where legally permissible under Rule 6.1.1), serial-number technical dictums, or retroactive RRNA permits (where allowed under Article 153 within 30 days). |
| 3. Integration of the File (Integración del Expediente) | Art. 153 & Art. 155 Customs Law | Day 11 (or upon completion of admitted expert/documentary evidence) | Once the 10-day defense window closes and all offered evidence is formally admitted and processed, the administrative file is legally deemed “integrated,” starting the authority’s 4-month resolution clock. |
| 4. Final Administrative Resolution (Resolución Definitiva) | Art. 153 (2nd Para.) & Art. 155 Customs Law | Maximum 4 Months from file integration | SAT/ANAM must issue and legally notify its final resolution determining whether the goods are released without penalty or assessing omitted duties, VAT, 130%–150% IGI fines (Art. 178), and declaring the goods forfeited to the Federal Treasury (pasan a propiedad del Fisco Federal, Art. 183-A). |
Crucial Procedural Defense (Caducidad): Under Article 153 and Article 155 of the Customs Law, if the customs authority fails to issue and legally serve the final resolution within that strict 4-month period, all proceedings are rendered legally null and void (quedarán sin efectos las actuaciones), and the authority must return the seized goods immediately.
4. How to Release Seized Goods Early: Article 154 Guarantee Substitution
Waiting 4 to 5 months for a PAMA resolution at the Laredo bridge or on an active assembly line can bankrupt a supply chain. Article 154 of the Customs Law provides an emergency release valve known as Substitution of the Precautionary Seizure (Sustitución del Embargo Precautorio):
- How It Works: The importer petitions the customs authority to release the physical merchandise or machinery in exchange for posting a Fiscal Interest Guarantee under Article 141 of the Federal Fiscal Code (such as a surety bond from an authorized Mexican bonding company, a bank letter of credit, or a deposit account) covering the estimated omitted duties, VAT, inflation updates, surcharges, and maximum statutory fines.
- When Substitution Is Prohibited (Article 154 & Article 183-A): You cannot substitute the seizure with a guarantee if the goods are prohibited, or if they fall under the permanent forfeiture categories of Article 183-A (such as goods lacking mandatory safety/health RRNAs that cannot be cured, or goods imported under a false importer domicile/forged invoice under Article 151, Section VI). However, for valuation disputes, classification disputes, or curable machinery documentation issues, Article 154 is the fastest legal mechanism to get the asset back into production while litigating the merits.
5. Post-Resolution Remedies: Revocation Appeal vs. Federal Tax Court
If SAT issues an unfavorable final PAMA resolution assessing duties, fines, and forfeiture under Articles 176, 178, and 183-A, the company has 30 business days following notification to file either:
- Administrative Appeal for Revocation (Recurso de Revocación: Art. 203 Customs Law & Art. 116–121 CFF): Filed online before SAT’s Legal Administration (Administración Desconcentrada Jurídica). Advantage: You Do not have to post a fiscal bond for the tax assessment while the administrative appeal is pending (Article 144 CFF), and it gives a second opportunity to introduce supervening technical evidence.
- Nullity Trial (Juicio Contencioso Administrativo) before the Federal Court of Administrative Justice (TFJA): Filed before the specialized customs chambers of the Federal Tax Court to challenge substantive classification, valuation, procedural violations in the Acta de Inicio, or expiration of the 4-month deadline.
Frequently asked questions
What is a PAMA in Mexican customs law?
PAMA stands for Procedimiento Administrativo en Materia Aduanera (Administrative Proceeding in Customs Matters), governed by Articles 150 through 155 of the Mexican Customs Law (Ley Aduanera). It is the formal legal proceeding initiated by customs authorities (ANAM at the border or AGACE during a factory audit) whenever they execute a precautionary seizure (embargo precautorio) of foreign merchandise, raw materials, or machinery.
Why would SAT seize US-owned machinery on our Mexican factory floor during an audit?
Under Article 151, Section III of the Customs Law, if AGACE auditors inspect a Mexican facility and find foreign machinery or equipment whose physical data plate (brand, model, and serial number) is missing, illegible, or does not match the serial number declared on the import pedimento (AF) and COVE, the machine is legally deemed 'undocumented foreign merchandise' under Article 146 and is placed under immediate precautionary seizure.
How many days do we have to respond once a PAMA seizure record (Acta de Inicio) is served?
Under Article 150 and Article 153 of the Mexican Customs Law, the importer has a strict, non-extendable deadline of 10 business days (días hábiles), counted from the business day after the PAMA initiation record takes legal effect, to submit a formal written defense (escrito de pruebas y alegatos) offering documentary proof of legal importation.
Can we get a seized truck or production machine released before the 4-month PAMA ruling is issued?
Yes, unless the merchandise is prohibited or falls under permanent forfeiture rules. Under Article 154 of the Customs Law, the importer can request the substitution of the precautionary seizure (sustitución del embargo precautorio) by posting a fiscal guarantee (such as a surety bond or letter of credit under Article 141 of the Federal Fiscal Code) covering the maximum estimated duties, VAT, updates, surcharges, and fines.
What happens if SAT fails to issue its final PAMA resolution within 4 months?
Under Article 153 (Second Paragraph) and Article 155 of the Customs Law, the customs authority must issue and notify its final determination within a maximum period of 4 months from the day after the administrative file is fully integrated (integration occurs when the 10-business-day defense period expires or when all admitted evidence is processed). If the authority misses that 4-month statutory deadline, the entire proceeding becomes legally void (queda sin efectos) and the seized assets must be released unconditionally.
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