PROSEC in Mexico: Tariff Savings and Supplier Documentation Checklist

Mexico's Sectoral Promotion Program, known by its Spanish acronym PROSEC (Programas de Promoción Sectorial), allows manufacturers operating in Mexico to import production inputs at preferential tariff rates of 0% to 5%, regardless of which country those inputs come from. That advantage applies even when no free trade agreement exists between Mexico and the supplier's country.

In 2026, Mexico's comprehensive customs reform raised Most Favored Nation (MFN) tariffs on 1,463 tariff lines by an average of 35%. As a result, the PROSEC program has evolved from a useful cost management tool into a critical survival mechanism for manufacturers sourcing from non-FTA countries.

This guide explains exactly how PROSEC works, which sectors qualify, how to combine it with the IMMEX program for maximum benefit, and what documentation your suppliers and production facilities need to maintain to keep the program active and audit-ready.

What Is PROSEC and Why Does It Matter in 2026?

PROSEC (Programas de Promoción Sectorial) is a Mexican government program that lets manufacturers import raw materials, components, and machinery at preferential tariff rates of 0% to 5%, regardless of which country those inputs come from. It covers 24 industrial sectors and is administered by the Secretaría de Economía.

What makes PROSEC unique is that its preferential tariff rates apply regardless of the country of origin of the imported inputs. Most tariff relief programs only work when goods originate from a country with a free trade agreement with Mexico. PROSEC removes that restriction. A manufacturer in the automotive sector can import components from China, South Korea, or India at 0% to 5%, even though none of those countries have an FTA with Mexico.

That is particularly important in today's trade environment. Mexico's January 2026 tariff reform raised MFN duties on over 1,463 tariff subheadings by an average of 35%, reaching as high as 50% on some categories. Manufacturers sourcing from non-FTA countries without PROSEC enrollment have seen landed costs climb sharply. Those already enrolled have been largely insulated.

Unlike IMMEX, PROSEC also carries no export requirement. A manufacturer selling entirely into the Mexican domestic market can still access preferential import rates on its inputs, making the program valuable for both export-oriented maquiladoras and companies serving the local market exclusively.

How PROSEC Differs from IMMEX

Both programs reduce import costs, but they work differently and serve different purposes.

IMMEX lets manufacturers temporarily import materials and components without paying duties or VAT, provided the finished goods are exported. The duty is not eliminated; it is deferred. If any finished product is sold domestically, the deferred duty on those components becomes immediately payable.

PROSEC works at the point of import. It reduces the duty rate on definitive imports to 0% to 5%, regardless of where the finished product ends up. No export requirement, no deferred liability.

The key differences between the two programs are summarized below.

The combined PROSEC and IMMEX strategy makes more sense with the IMMEX context. Our IMMEX program overview covers the essentials in plain language.

The 24 PROSEC Sectors: Which Industries Qualify?

PROSEC currently covers 24 industrial sectors, defined in Article 3 of the PROSEC Decree. Each sector includes a specific list of authorized finished goods (the products the manufacturer must produce) and a corresponding list of authorized inputs (the goods that may be imported at preferential rates under that sector).

The 24 sectors span a wide range of industries relevant to Mexico's manufacturing base:

• Heavy Industry and Materials: Steel and iron, mining and metallurgy, chemicals, rubber and plastics
• Manufacturing and Assembly: Automotive and auto parts, electronics and electrical equipment, capital goods (machinery and equipment), agricultural machinery, tools
• Consumer and Specialized Goods: Textiles and apparel, footwear, furniture, toys, photography equipment, diverse manufactured goods
• Advanced and Strategic Industries: Pharmaceuticals and medical equipment, aerospace components, information technology hardware, semiconductors
• Resource and Process Industries: Hides and leathers, paper and printing, glass

Companies can hold registrations in more than one sector if their production spans multiple eligible areas. Each authorization is tied to the specific tariff codes for that sector's finished goods and inputs, so a manufacturer producing both automotive parts and electronic subassemblies can legitimately run both sector registrations with separate input lists.

One restriction to note: in December 2024, the Ministry of Economy excluded certain finished textile products from PROSEC eligibility. Apparel and textile manufacturers should verify their HS codes against the current Decree before assuming continued coverage.

How PROSEC Tariff Savings Work in Practice

The mechanics are simpler than they might appear. When a PROSEC-enrolled manufacturer imports an input that is listed in its authorized sector's Article 5 list, it declares the PROSEC program on the customs entry (pedimento) and pays the PROSEC preferential rate rather than the standard MFN rate.

Here is a concrete illustration across three different sectors:

• Automotive (Sector 18): A manufacturer imports rolled steel from South Korea. Standard MFN rate: 15%. PROSEC rate: 0%. On a $116,000 USD monthly shipment, the monthly saving is $17,400 USD. Annual saving: over $208,000 USD.
• Electronics: A contract manufacturer in Guadalajara imports printed circuit board assemblies from Taiwan. Standard MFN rate after the 2026 reform: 25%. PROSEC rate: 0% to 5%. On $50,000 USD in monthly PCB imports, the monthly saving ranges from $10,000 to $12,500 USD.
• Pharmaceuticals: A laboratory imports active pharmaceutical ingredients (APIs) from India. Standard MFN rate: 10%. PROSEC rate: 0%. On $200,000 USD in monthly API imports, the monthly saving is $20,000 USD, or $240,000 USD annually.

These numbers explain why PROSEC is not simply a compliance program. It is a financial performance program. The savings generated by proper PROSEC enrollment can exceed the entire annual cost of a compliance team dedicated to maintaining the program.

Two things are critical to understand about how the savings work. First, PROSEC benefits are input-specific. Holding a PROSEC registration does not mean every import gets a reduced rate. Only the inputs listed in the Decree for your authorized sector qualify. Anything outside that list pays full MFN duties regardless of your registration status.

Second, the preferential rate is tied to the exact 8 digit TIGIE tariff code. An incorrect classification by the customs broker can either prevent you from claiming a legitimate saving or create a false claim that triggers retroactive duties. Getting the tariff code right is not a formality; it is the foundation of the benefit.

PROSEC and Rule 8: The Combined Framework

PROSEC covers a defined list of inputs for each sector. But what happens when a manufacturer needs to import an input that is essential to its production process and simply is not on that list?

To address this gap, manufacturers can turn to Rule 8 (Regla 8). It is an import permit issued by the Ministry of Economy that extends preferential tariff treatment to inputs not covered under the PROSEC Article 5 catalog. Approved goods are imported under heading 98.02 of the TIGIE, a specialized classification pathway created specifically for this purpose.

Two conditions must be met before Rule 8 is available:

• The company must already hold a valid PROSEC registration
• For temporary imports, an active IMMEX program is also required

Rule 8 cannot be used as a standalone tool. It works only as an extension of an existing PROSEC authorization.

Applications are filed through VUCEM and must include a technical justification explaining why the input is necessary for production, confirmation that it falls outside the Article 5 authorized list, and evidence that the finished goods are covered by the sector authorization.

Why Rule 8 matters more in 2026: With MFN tariffs now reaching 50% on certain industrial inputs from non-FTA countries, inputs that were previously cheap enough to import at full MFN rates have crossed a threshold where the Rule 8 application effort is clearly worth it. Any manufacturer holding PROSEC should review their full input list against both the Article 5 catalog and Rule 8 eligibility as part of a 2026 cost review.

The IMMEX and PROSEC Combination: Maximum Tariff Optimization

Holding both IMMEX and PROSEC simultaneously is the most powerful tariff structure available to manufacturers in Mexico. Here is how the two programs work together in a real production scenario:

Import under IMMEX. A manufacturer imports components from China at a standard MFN rate of 15%. Under IMMEX, that duty is deferred because the goods are destined for export manufacturing.

Production begins. The components enter the facility and are used in manufacturing.

Domestic sale decision. The manufacturer redirects a portion of its finished goods to the Mexican domestic market. The components used in those units can no longer remain under temporary import status. Their customs regime must be changed from temporary to definitive, making the deferred 15% duty immediately payable.

PROSEC steps in. Because the manufacturer also holds a PROSEC registration, it invokes its PROSEC rate at the moment of the regime change. Instead of paying 15%, it pays 0% to 5%. The components move from export-protected to domestic market status at near-zero additional duty cost.

For a full breakdown of how IMMEX duty deferral and regime changes work, see our detailed IMMEX and maquiladora guide.

The result is that a single production facility can serve both export and domestic markets without the tax liability that would otherwise make domestic sales uncompetitive. Without PROSEC, every unit redirected from export to domestic sale triggers a significant duty bill. With PROSEC, that cost largely disappears.

The combination also addresses a USMCA limitation. Article 2.5, the "Lesser of Two Duties" rule, caps the duty exemption benefit on IMMEX goods exported to the US or Canada. PROSEC and Rule 8, when properly structured within the IMMEX framework, can neutralize that limitation and preserve the full cost advantage on northbound shipments containing non-regional inputs.

Who Qualifies for PROSEC? Eligibility Requirements

PROSEC is available exclusively to manufacturers. Importers, distributors, trading companies, logistics providers, and wholesalers do not qualify, regardless of their industry or import volume. The program is designed to benefit companies that physically manufacture or transform goods in Mexico.

To qualify, a company must meet all of the following requirements:

• Legal establishment in Mexico. The applicant must be a legally constituted entity in Mexico with an active RFC (Registro Federal de Contribuyentes), the Mexican federal taxpayer identification number, in current compliance with tax obligations.
• Enrollment in the SAT Importer Registry. The company must be registered in the Padrón de Importadores, the Mexican Tax Administration Service's importer registry. Without active Padrón status, no import operations can be conducted legally.
• Proof of manufacturing activity. This is the core eligibility requirement. The company must demonstrate that it actually manufactures or transforms goods within one of the 24 PROSEC sectors. This proof takes the form of documentation of production processes, facility descriptions, machinery inventories, and production records. A company that only assembles or packages finished goods for resale without genuine transformation may not meet this threshold.
• Production of goods listed in Article 4 of the PROSEC Decree. The finished goods the manufacturer produces must fall within the authorized product list for the sector under which it is applying.
• Importation of inputs listed in Article 5 of the PROSEC Decree. The inputs for which preferential treatment is sought must appear in the authorized input list for that sector.
• Valid e.firma. Mexico's electronic signature credential is required for all VUCEM filings, including the PROSEC application itself.

One important nuance: PROSEC authorization is tied to specific tariff codes, not granted company-wide. Claiming PROSEC rates on inputs outside the Article 5 catalog for your registered sector is a compliance violation and can trigger retroactive duty assessments and program cancellation.

How Do You Keep Your PROSEC Authorization Active?

Once enrolled, companies must meet three ongoing obligations to keep the program active and defensible under SAT scrutiny.

RAOCE: The Annual Filing

PROSEC companies must file the Annual Report of Foreign Trade Operations (RAOCE) electronically through VUCEM every year. The filing window runs from April 1 to April 30. Miss it and the program is automatically suspended. Miss the June 30 cure date and it is permanently cancelled. For companies holding both PROSEC and IMMEX, the export threshold must also be confirmed: total exports must equal at least 40% of total invoicing, or a minimum of $2,000,000 USD annually.

Inventory Control and Traceability

PROSEC only: Maintain production records that link each import entry to the finished goods it contributed to, proving inputs were used in authorized manufacturing and not diverted for resale.

PROSEC and IMMEX combined: Annex 24 inventory records must be updated within 48 hours of any movement, with real-time SAT access to the automated control system maintained at all times.

What SAT Audits Look For in 2026

• SAT's AI-driven audit tools specifically flag PROSEC operators for these violations:
• Inputs imported at PROSEC rates that are not in the Article 5 authorized catalog
• Finished goods that do not match the Article 4 product list for the registered sector
• Inputs diverted to domestic resale outside the authorized production process
• Tariff classifications on pedimentos that do not match the company's BOM
• Missing traceability records between imported inputs and finished goods

Penalties for non-compliance are serious. SAT can reassess duties at full MFN rates, add Customs Law penalties of up to 130% of omitted duties, and impose CFF fines of 55%. Under the January 2026 Customs Law reform, the most serious violations now carry criminal liability for company executives.

The PROSEC Supplier Documentation Checklist

This checklist is designed for quality and compliance managers auditing a Mexican supplier's PROSEC program, onboarding a new manufacturer operating under PROSEC, or conducting a self-assessment ahead of a SAT review. It covers enrollment verification, input eligibility, inventory controls, RAOCE filing status, and audit readiness.

Section A: PROSEC Program Status Verification

• Does the supplier hold a current, valid PROSEC authorization issued by the Secretaría de Economía?
• Is the authorization number documented and available for customs broker reference on pedimentos?
• Has the authorization been confirmed as active within the last 12 months (not expired or suspended)?
• Are all sector registrations confirmed in writing, with the specific sectors and corresponding Article 4 finished goods and Article 5 input codes identified?
• If the supplier operates in multiple sectors, has each sector authorization been verified separately?
• Has the supplier confirmed that PROSEC eligibility criteria for their specific textile or apparel HS codes (if applicable) were reviewed against the December 2024 Ministry of Economy revisions?

Section B: Manufacturing Eligibility and Production Documentation

• Is the supplier a legal manufacturing entity established in Mexico with an active RFC in current SAT compliance?
• Is the supplier enrolled in the SAT Padrón de Importadores (Importer Registry) with no active suspension?
• Does the supplier have documented proof of manufacturing activity: facility descriptions, machinery inventories, and production records that demonstrate genuine transformation of goods?
• Are the finished goods the supplier produces confirmed against the Article 4 product list for their authorized PROSEC sector at the 8-digit TIGIE level?
• Does the supplier maintain an updated Bill of Materials that maps authorized inputs from Article 5 to finished goods from Article 4?
• Is production process documentation current and sufficient to demonstrate to SAT that imported inputs are used in authorized manufacturing activities?

Section C: Tariff Classification Accuracy

• Has the supplier confirmed 8-digit TIGIE classifications for all inputs being imported under PROSEC benefits?
• Has tariff classification been independently verified (not relying solely on the customs broker's initial classification) for all high-value or high-volume input categories?
• Are TIGIE classifications on import pedimentos consistent with the supplier's internal BOM and inventory records?
• Have classifications been reviewed against the 2026 TIGIE reform to account for any reclassifications affecting eligible inputs?
• Is a process in place to review and update tariff classifications when input specifications change or when new inputs are added to the BOM?

Section D: Rule 8 Authorization (if applicable)

• Has the supplier identified inputs essential to production that are not listed in the Article 5 authorized input catalog?
• Has a Rule 8 application been filed through VUCEM for those inputs, with technical justification documented?
• Is the Rule 8 authorization number documented and referenced correctly on pedimentos for covered imports?
• Are Rule 8 imports maintained separately in inventory records from standard PROSEC Article 5 imports?
• Has a "Lesser of Two Duties" analysis been completed where PROSEC, Rule 8, and Article 2.5 USMCA interactions affect IMMEX export operations?

Section E: IMMEX and PROSEC Combined Compliance (if both programs are held)

• Does the supplier hold both a valid IMMEX program and a PROSEC authorization?
• Is the Annex 24 inventory control system updated within 48 hours of all inventory movements?
• Is SAT online access to the Annex 24 automated control system maintained and functional?
• Are customs regime change (IMMEX temporary to PROSEC definitive) operations documented with PROSEC authorization references?
• Are the deferred duty calculations for IMMEX domestic sales invoking PROSEC rates confirmed to be accurate?
• Is the export percentage threshold (40% of invoicing or $2,000,000 USD in total exports) being monitored monthly?
• Are virtual transfer procedures between facilities documented and reported through VUCEM?

Section F: RAOCE Annual Filing Compliance

• Was the most recent RAOCE filed for the PROSEC program within the April 1 to April 30 filing window?
• Does the RAOCE accurately reflect total sales, total exports, value of PROSEC imports, and the correct export percentage calculation?
• Is RAOCE filing responsibility assigned to a specific compliance owner within the organization?
• Are prior RAOCE filings archived and retrievable for at least five years?
• Has the supplier confirmed there are no RAOCE-related suspensions or outstanding filing deficiencies?

Section G: Input Traceability and Productive Use Documentation

• Are import pedimentos for PROSEC-declared entries linked to specific production orders or job references?
• Can the supplier trace each PROSEC-imported input from customs entry through the production process to the finished good produced?
• Are records maintained confirming that inputs were not diverted to domestic resale, storage for non-production purposes, or transfer to non-authorized parties?
• Is the inventory system capable of separating PROSEC-imported inputs from non-PROSEC goods at the item level?
• Are production scrap, waste, and material loss records maintained and reflected in inventory balances?

Section H: SAT Blacklist and Counterpart Verification

• Has the supplier confirmed that its PROSEC authorization does not appear on any SAT suspension or cancellation lists?
• Has the supplier verified that its suppliers providing inputs imported under PROSEC are not included on SAT's EFOS or EDOS lists (entities issuing or receiving invoices for non-existent transactions)?
• Are counterpart verification procedures documented and performed at least quarterly?
• Does the supplier's customs broker hold valid credentials and is not subject to any professional sanctions or restrictions?

Section I: Audit Readiness and Record Retention

• Are all PROSEC-related documents retained for a minimum of five years, including pedimentos, authorizations, production records, and RAOCE filings?
• Can the supplier produce a complete PROSEC compliance file within 30 days of a SAT information request?
• Has the supplier conducted an internal PROSEC compliance review within the last 12 months?
• Is a designated foreign trade compliance owner responsible for monitoring PROSEC Decree amendments and Ministry of Economy updates?
• Have engineering, logistics, finance, and customs teams been trained on their respective roles in maintaining PROSEC compliance?
• Is there a documented corrective action process for when PROSEC compliance gaps are identified internally?

Common PROSEC Compliance Failures and How to Avoid Them

Most PROSEC problems are predictable and preventable. These are the five failures that come up most often, and what to do about each.

AMREP Mexico Supports PROSEC Compliance on the Ground

AMREP Mexico helps manufacturers, OEMs, and buyers verify that PROSEC compliance is properly maintained at the supplier level. Our Supplier Quality Services include supplier audits, source inspections, and resident engineering services that assess PROSEC authorization status, BOM and Article 5 alignment, inventory traceability, TIGIE classifications, and supporting documentation.

By identifying and correcting compliance gaps before they become customs issues, we help businesses protect their tariff savings and reduce the risk of retroactive duties and supply chain disruptions.

Need to verify your suppliers' PROSEC compliance? Contact AMREP Mexico for on-the-ground audits, inspections, and compliance support across Mexico's major manufacturing regions.