The 5 IMMEX Modalities Explained: Industrial, Services, Shelter, Outsourcing, and Holding

When a company applies for an IMMEX program with Mexico’s Ministry of Economy (Secretaría de Economía: SE), it does not apply for a generic permit. Under Article 3 of the IMMEX Decree (Decreto para el Fomento de la Industria Manufacturera, Maquiladora y de Servicios de Exportación), the applicant must select and qualify for one of five legal modalities (modalidades).

Selecting the wrong modality, or changing your business model from pure manufacturing to kitting, distribution, or warranty repair without updating your modality in VUCEM, is a frequent cause of VUCEM application rejections and SAT audit penalties.

Here is how each of the five IMMEX modalities works in law and day-to-day operations.

Quick Comparison: The 5 IMMEX Modalities (Article 3 of the IMMEX Decree)

1. IMMEX Industrial Modality (Modalidad Industrial)

Legal Definition (Article 3, Fraction II): Authorizes an industrial process of elaboration or transformation of merchandise destined for export.

In customs terms, an Industrial IMMEX expects a genuine change in the physical nature or tariff classification of the imported inputs: raw materials, resins, sheet metal, electronic components, or sub-assemblies enter under temporary import (IN), pass through a bill of materials (BOM) in the Anexo 24 system, and exit as a transformed finished product under an export return (RT) or virtual transfer (V1).

• When to choose it: Your Mexican facility performs machining, injection molding, stamping, welding, PCBA assembly, chemical blending, or mechanical integration.
• Key compliance focus: Accurate BOM conversion factors, scrap (merma) and waste (desperdicio) percentages, and tariff classification alignment between authorized inputs and finished export goods.

2. IMMEX Services Modality (Modalidad de Servicios)

Legal Definition (Article 3, Fraction III): Authorizes the performance of services to exported goods or the rendering of export services, strictly limited to the activities established by the Ministry of Economy in Annex 3.2.2 of the Reglas y Criterios de Carácter General en Materia de Comercio Exterior de la SE.

Unlike the Industrial modality, a Services IMMEX does not require transforming raw materials into a new tariff classification. Instead, goods can enter under temporary import (IN), undergo an authorized service process, and be exported (RT) under the exact same HS tariff classification in which they entered.

Authorized Activities Under Annex 3.2.2 for IMMEX Services

The Ministry of Economy authorizes the following specific activities under the Services modality:

1. Supply, Storage, Logistics, and Distribution (Abastecimiento, almacenaje o distribución): Receiving, storing, picking, and distributing inventory for export or for delivery to other IMMEX companies via virtual pedimentos (V1).
2. Sorting, Inspection, and Quality Testing (Clasificación, inspección, prueba o verificación): Quality control sorting, calibration, laboratory testing, and verification of components.
3. Kitting, Packaging, Re-Packaging, and Labeling (Operaciones que no alteren materialmente las características de la mercancía): Packing, unpacking, re-packing, labeling, tagging, and assembling kits or retail displays for export.
4. Integration of Sets (Integración de juegos o kits): Combining multiple parts into surgical kits, tool kits, or hardware packs.
5. Repair, Rework, Refurbishment, and Remanufacturing (Reparación, retrabajo o mantenimiento): Warranty repair centers for electronics, medical devices, aerospace components, or industrial motors returned from the US for refurbishment and re-export.
6. Recycling and Material Recovery (Reciclaje o acopio): Processing recyclable waste or scrap for export.
7. Product Design, Engineering, and Software (Diseño o ingeniería de productos / software): Specialized intangible export services recognized in Annex 3.2.2.

Important Restriction for Sensitive Goods (Annex II of the IMMEX Decree): If a Services IMMEX company wants to import sensitive goods (such as textiles, steel, or aluminum listed in Annex II of the IMMEX Decree), Mexican rules generally require that the company hold an active SAT IVA/IEPS Certification or meet heightened authorization criteria; pure uncertified service warehouses cannot freely import sensitive tariff classifications.

3. IMMEX Shelter Modality (Modalidad de Albergue)

Legal Definition (Article 3, Fraction IV): One or more foreign companies provide the technology and the productive material (raw materials and consigned machinery/tooling) without directly operating the program, while a Mexican company registered under the Shelter modality puts its legal entity, facilities, workforce, and IMMEX/IVA certification at their disposal to perform the manufacturing.

• How it works in practice: The foreign manufacturer (e.g., a US Delaware or Texas corporation) signs a shelter services agreement with an established Mexican shelter provider. The shelter provider acts as the Mexican Importer of Record (IOR), registers the dedicated plant address (domicilio de planta) under its Shelter IMMEX program, clears the foreign client’s raw materials (IN) and consigned machinery (AF), and employs the direct labor on its Mexican payroll.
• Tax & Permanent Establishment Protection: Under Articles 181, 182, and 183 of the Mexican Income Tax Law (Ley del Impuesto sobre la Renta: LISR), the foreign company can operate under a qualified Maquila Shelter structure without triggering a traditional corporate Permanent Establishment (Establecimiento Permanente) in Mexico, provided the shelter operator complies with maquila safe-harbor transfer pricing and informative filing rules.
• (For a full economic and legal comparison between setting up your own entity vs. using a shelter, see IMMEX Standalone vs. Shelter Manufacturing in Mexico).

4. IMMEX Outsourcing Modality (Modalidad de Terciarización)

Legal Definition (Article 3, Fraction V): A certified company that lacks its own manufacturing facilities performs manufacturing operations through registered third-party sub-manufacturers (terceros) that it registers in its IMMEX program.

• Crucial Prerequisite: Under the IMMEX Decree and Ministry of Economy rules, an applicant for the Terciarización modality must hold an active SAT IVA/IEPS Certification (or OEA certification) and register the specific Mexican sub-manufacturers (empresas terceras) that will physically perform the transformation.
• Difference vs. Sub-maquila (Article 21): Do not confuse the Outsourcing (Terciarización) modality with routine Sub-maquila (Submanufactura under Article 21 of the IMMEX Decree):
  • Any standard Industrial IMMEX company that does have its own factory can register third-party Mexican workshops (submanufactureros) under Article 21 to perform a specific step of its process (such as heat treating, anodizing, plating, or painting) and move parts back and forth using Notices of Sub-maquila Transfer (Avisos de traslado).
  • The Terciarización modality, by contrast, is only for a certified company that does not own or lease a factory of its own and relies entirely on registered third parties for production.

5. IMMEX Holding Modality (Modalidad Controladora de Empresas)

Legal Definition (Article 3, Fraction I): Integrates the manufacturing operations of a certified holding company (empresa controladora) and one or more controlled subsidiary societies (sociedades controladas) under a single consolidated IMMEX program.

• Who uses it: Large multinational groups that own multiple Mexican legal entities (RFCs) across different states and want to consolidate export commitments, inventory flows, and program administration under one master IMMEX authorization rather than maintaining separate IMMEX programs for every subsidiary.

6. Can a Company Hold Multiple Modalities or Add Activities?

Yes. An existing IMMEX Industrial company frequently discovers that its US parent or customers also want the Mexican facility to:

• Act as a regional repair and refurbishment depot for returned products; or
• Import finished accessories to kit and ship alongside its manufactured goods without physically transforming those accessories.

Rather than applying for a second IMMEX number (a single Mexican tax ID / RFC can only hold one IMMEX registration number), the company files an IMMEX Program Extension or Modality Modification (Ampliación / Cambio de Modalidad) through VUCEM to register the additional Services activities alongside its Industrial authorization.

Audit Warning: Never import finished goods under temporary code IN for simple kitting, repackaging, or warranty repair if your VUCEM profile only authorizes an Industrial process without the corresponding Services activity and tariff classifications registered. If SAT auditors verify that items imported under IN left Mexico in the exact same tariff classification without an authorized Services process or BOM transformation, they can reclassify the import as an illegal temporary import and assess duties, 16% IVA, and fines under Article 176 of the Ley Aduanera.