What Is Mexico’s Eighth Rule?

Mexico offers several trade programs designed to make manufacturing more competitive—but one of the most valuable is also one of the least understood: the Eighth Rule. For companies manufacturing in Mexico, understanding how this mechanism works can help reduce import costs and make production strategies more efficient.

Whether you are evaluating a new manufacturing operation in Mexico or already have an established plant, this guide explains what the Eighth Rule is and how companies can use this tariff mechanism more effectively.

What Is the Eighth Rule?

The Eighth Rule is a Mexican foreign trade mechanism that allows eligible manufacturers to import certain raw materials and components under tariff heading 98.02 with preferential import duty treatment, subject to authorization from the Ministry of Economy and the applicable PROSEC requirements.

From a legal perspective, the Eighth Rule operates through a prior import authorization issued by the Ministry of Economy. This authorization allows eligible companies to import specific raw materials and components used in manufacturing or assembly operations in Mexico under special tariff classifications within heading 98.02. 

Eligible goods authorized under the Eighth Rule may qualify for a 0% General Import Duty (IGI) rate, provided they meet the applicable production, PROSEC, and authorization requirements. This can reduce the import cost of materials and components that would otherwise be subject to higher duties.

The term “Eighth Rule” comes from the Eighth Complementary Rule for the interpretation of Mexico’s General Import and Export Tax Law (TIGIE). In practice, access to this mechanism is linked to the company’s corresponding PROSEC authorization and the specific sector and goods covered by the permit.

Because this registration is no longer in effect, the Ministry of Economy now recognizes authorization under the Sector Promotion Program (PROSEC) as its direct legal equivalent. Therefore, any company seeking to benefit from the Eighth Rule must have an active PROSEC program for the sector corresponding to its production activities.

How the Eighth Rule Works with PROSEC and IMMEX?

To fully understand the Eighth Rule, it is important to understand its relationship with two other Mexican foreign trade promotion programs: PROSEC and IMMEX. Although all three are designed to help reduce costs, their scope and requirements differ significantly.

Practical Example: PROSEC vs. the Eighth Rule

• PROSEC may reduce the import duty on an eligible input without necessarily bringing it to 0%. For example, a material subject to a 25% IGI could qualify for a 5% rate under PROSEC.

• For other eligible materials, an Eighth Rule authorization may be evaluated as an additional option to potentially reduce the import duty to 0%, subject to the applicable requirements and authorization.

The Flexibility Offered by the Eighth Rule

Its relationship with PROSEC allows manufacturers to access the Eighth Rule’s duty-free rate while maintaining a level of commercial flexibility that IMMEX does not directly provide: the ability to sell finished goods in the Mexican domestic market.

The benefit applies only to the goods, tariff classifications, quantities, values, and manufacturing project covered by the authorization. Companies must therefore evaluate each operation individually and maintain the documentation needed to support the use of the Eighth Rule. 

On the other hand, when imports are temporary and intended to be transformed into finished products for export, the Eighth Rule operates under the IMMEX program. In this scenario, companies manufacturing goods for export can combine duty deferral with the full tariff exemption granted under heading 98.02, helping optimize production costs and operating cash flow.

Authorization Modalities and Technical Criteria

The Ministry of Economy grants an Eighth Rule permit only when the applicant company can demonstrate the technical justification for the operation in accordance with Annex 2.2.2 of the General Rules and Criteria for Foreign Trade. To do so, the Ministry establishes specific authorization modalities under which importers may support their request for duty-free supply.

Importance for Exporters and Nearshoring

In the context of the global relocation of supply chains or nearshoring, the Eighth Rule plays an increasingly important role in Mexico’s investment attraction strategy. When multinational companies establish operations in Mexico, they often initially face a limited local supplier base capable of meeting the technological requirements for high-precision components and specialized machinery.

For exporters, the Eighth Rule removes tariff barriers that can increase the cost of sourcing inputs from countries with which Mexico does not have a free trade agreement. By allowing the duty-free importation of advanced machinery, tooling, and specialized raw materials, exporters can gain several competitive advantages:

The Eighth Rule is undoubtedly one of the most powerful tools for optimizing the cost structure of a manufacturing operation in Mexico. However, as we have seen, successful implementation requires navigating a complex regulatory environment with technical nuances and strict compliance requirements. Poor management can not only eliminate its benefits, but also expose the company to serious penalties that could put the operation at risk.

At this point, having the right strategic partner can make the difference between success and risk.

Prodensa is the partner global manufacturers choose to establish, expand, and operate in Mexico with confidence. With more than 40 years of experience and over 1,000 successful industrial projects, we are the only firm that brings together strategic consulting, industrial real estate, and operational startup services under one roof.

Eighth Rule: A Mexican trade mechanism that allows eligible manufacturers to import certain machinery, materials, inputs, parts, and components under special tariff classifications with a 0% import duty.

PROSEC: Mexico’s Sector Promotion Program, which allows manufacturers in specific industries to access preferential import duty rates. An active PROSEC program is required to use the Eighth Rule.

IMMEX: A Mexican program that allows companies to temporarily import goods used in manufacturing or assembly for export, with import duties deferred subject to the return or export of those goods.

Heading 98.02: A special tariff heading under Mexico’s TIGIE used for Eighth Rule imports. Eligible goods classified under this heading may enter Mexico with a 0% General Import Duty (IGI).

General Import Duty (IGI): The import tariff normally applied to goods entering Mexico. Under the Eighth Rule, eligible imports classified under heading 98.02 may be exempt.

Does a Company Need PROSEC to Use the Eighth Rule? 

Yes. Companies seeking Eighth Rule tariff benefits must have an active PROSEC program for the sector corresponding to their manufacturing activities.

How Is the Eighth Rule Different from IMMEX? 

The Eighth Rule provides a full import duty exemption for eligible inputs and machinery, while IMMEX allows temporary imports with duty deferral for goods that will ultimately be exported or returned abroad.

Can Goods Imported Under the Eighth Rule Be Sold in Mexico? 

Yes. Through its relationship with PROSEC, finished goods may be sold in the Mexican domestic market. In these cases, the company remains exempt from IGI but must pay the applicable VAT and Customs Processing Fee (DTA).

Why Is the Eighth Rule Relevant for Nearshoring? 

It can help manufacturers access specialized machinery, tooling, and inputs from countries without a free trade agreement with Mexico while reducing import costs. This can be especially useful when local supply is unavailable or does not meet the required.

• The Eighth Rule can be a powerful cost-optimization tool for manufacturers in Mexico. Eligible companies may import certain machinery, materials, and components under heading 98.02 with a 0% import duty, provided they meet the applicable requirements.
• PROSEC is essential to accessing the Eighth Rule. Companies seeking its tariff benefits must maintain an active PROSEC program for the sector corresponding to their manufacturing activities.
• The combination of the Eighth Rule, PROSEC, and IMMEX can provide greater operational flexibility. Depending on the structure of the operation, manufacturers can support both domestic sales and export-oriented production while optimizing duties and cash flow.
• The Eighth Rule can strengthen nearshoring strategies when local supply is limited. It can help manufacturers access specialized machinery, tooling, and inputs that are unavailable—or do not meet required specifications—in Mexico.
• The benefit depends on proper compliance and execution. Technical justification, authorization requirements, and ongoing regulatory management are critical; poor implementation can eliminate the tariff advantage and expose the operation to penalties.
  
  

Notice: The content of this blog is developed by Prodensa for informational and educational purposes regarding nearshoring, foreign trade, human capital, and manufacturing in Mexico. Although we strive to keep the information accurate and up to date, laws and regulations may change. This material is not a substitute for specialized professional advice. Prodensa is not responsible for decisions made based on this content without appropriate professional consultation.