How to get an IMMEX program
Who can hold a program, the export commitment, what goes in the file and the fifteen-business-day rule — with the article numbers.
Independent editorial resource
Mexico Manufacturing for US Buyers
An independent resource for US procurement sourcing in Mexico: how IMMEX affects you, how to qualify a supplier, RFQs, and USMCA origin.
Sourcing from Mexico can lower cost and shorten supply chains — but the savings are real only if you qualify suppliers properly, run RFQs that price in the cross-border reality, and understand how IMMEX and USMCA actually work. This section is built for the buyer's decisions, not as a directory.
Buying manufactured parts from Mexico?
- Qualify the supplier: record the entity, site, quality, capacity and inventory evidence still needed for your order.
- Prepare a comparable RFQ: download the template and define process, materials, annual quantity, quality requirements and timing.
- Discuss your manufacturing requirements: send AMMEX a non-confidential overview for internal review.
Setting up your own manufacturing operation?
If your company will operate production in Mexico, start with IMMEX project requirements and the shelter versus standalone responsibility comparison. For goods storage and movement planning, prepare a warehouse requirements brief.
No supplier has been qualified by AMMEX through this pathway. Your procurement, quality and trade teams remain responsible for evaluating the evidence.
Editorial note: ammex.org.mx is an independent resource operated by Heberey LLC. It does not represent or affiliate with AMMEX, Index Metropolitana, INDEX Nacional, any authority, or prior operators of the domain.
Guides for the buying & compliance decision
IMMEX for US buyers
What IMMEX is, why it affects your cost and risk, and what "we have IMMEX" does and does not guarantee.
Qualify an IMMEX supplier
A structured checklist to tell a supplier that can actually take a US order from one that cannot — before you commit.
Mexico supplier RFQ checklist
What to put in an RFQ to a Mexican manufacturer so quotes are comparable and the cross-border reality is priced in.
USMCA rules of origin
How a product qualifies for preferential treatment under USMCA, and why IMMEX efficiency does not guarantee origin.
USMCA certificate of origin
The nine minimum data elements a certification must carry, who can sign it, and why there is no official form.
Supplier OEA / AEO status
What a Mexican supplier's OEA certification signals, and how mutual recognition with C-TPAT works.
The 5 IMMEX modalities: Industrial, Services, Shelter, Outsourcing & Holding
How Article 3 of the IMMEX Decree structures the five modalities, including Annex 3.2.2 Services (3PL, kitting, repair) and Shelter operations.
PROSEC and Regla Octava (Chapter 98) explained
How Sectoral Promotion Programs and Rule 8 prior permits reduce Mexican MFN import tariffs to 0%–5% on non-USMCA raw materials and machinery.
USMCA Article 2.5 & non-originating inputs under IMMEX
Why IMMEX does not waive Mexican duties on Chinese/Asian components exported to the US or Canada, how the "lesser of" formula works, and Section 301 vs USMCA origin.
What is a Mexican pedimento? Structure & compliance guide
Line-by-line anatomy of Mexico's official customs declaration, valuation fields, DODA/PITA crossing QR codes, and statutory audit liabilities.
Mexican pedimento codes: A1, IN, RT, V1, AF, and F4
Complete reference to Anexo 22 Apéndice 2 regime codes, permanence deadlines (18 months vs 6 months), and F4/F5 regime changes.
Virtual pedimentos (V1): IMMEX-to-IMMEX domestic transfers
How Mexican factories transfer goods domestically without crossing the border or charging 16% VAT, and how to survive SAT materiality audits.
Consigned tooling, molds & machinery under IMMEX (AF pedimentos)
How US companies place customer-owned molds and equipment in Mexican plants without losing legal title or triggering customs seizure.
COVE, VUCEM, Manifestación de Valor & Anexo 22 identifiers
How electronic value proofs work and what two-letter identifiers (CI, IM, TL, PS, C1, EN, V1) mean on a Mexican pedimento.
Anexo 24 (Annex 24) & Anexo 31 explained
How automated inventory control (Anexo 24) and the VAT/IEPS tax credit ledger (Anexo 31 / SCCCyG) govern every temporary import.
IMMEX vs Shelter vs Maquiladora & Importer of Record (IOR)
Compare standalone IMMEX vs Shelter manufacturing, understand Mexican Importer of Record (IOR) rules, and avoid pre-shipment holds.
IVA & IEPS Certification in Mexico (Rubro A, AA, AAA)
How certified IMMEX plants obtain the 100% VAT/IEPS tax credit at import, Rule 7.1.2 criteria, the $50M/$100M MXN fixed asset thresholds for AA/AAA (Rule 7.1.3), and AGACE suspension defense.
Maquiladora Safe Harbor (6.9% / 6.5%) & Permanent Establishment (PE) Tax Rules
How US parent companies protect against Mexican Permanent Establishment (Art. 181–183 LISR) and calculate the higher of 6.9% on assets vs. 6.5% on operating costs.
Anexo 24 Apartado C: SAT Real-Time Online Inventory Access
Technical and legal guide for IT, ERP, and compliance teams implementing mandatory electronic SAT access to Anexo 24 inventory ledgers.
SAT Data Stage (Glosa) vs. Anexo 24 Monthly Reconciliation
How to parse the monthly SAT Data Stage raw ASCII tables (501, 551, 554, 701) and reconcile them against ERP receipts and Anexo 24.
PAMA Customs Seizure in Mexico (Art. 151): Protecting Machinery & Inventory
The 7 statutory triggers for precautionary seizure of equipment and raw materials, the 10-day legal defense clock (Art. 153), and bailout strategies.
Mexican Customs Valuation: Electronic Manifestación de Valor (E2) & Incrementables
How to value consigned raw materials, intercompany transfers, and tooling assists (Art. 65 Incrementables) without triggering Art. 200 valuation fines.
IMMEX Retention Deadlines (18 Months vs. 6 Months for V1) & F4/F5/A3 Regularization
Statutory stay windows under Art. 108 of the Customs Law, the 6-month virtual import trap (RGCE 4.3.21), and comparing F4/F5 regime changes vs. A3 regularization.
SCCCyG Over-Discharge (Sobredescargo), R1 Rectifications & UMT Unit Conversion
How to diagnose negative Anexo 30 credit balances caused by UMC-to-UMT conversion errors and execute R1 pedimento rectifications safely.
Mexican HTS Tariff Classification: 8-Digit TIGIE + 2-Digit NICO Explained
Why US 10-digit HTSUS codes diverge after digit 6 in Mexico, how NICO statistical suffixes work, and preventing Appendix 9 RRNA border holds.
How to Choose Anexo 24 & SCCCyG (Anexo 30) Software for Your ERP
RFP scorecard for evaluating Mexican customs inventory software: automated VUCEM/Data Stage ingestion, FIFO lot engine, BOM versioning, and Apartado C readiness.
Contract Manufacturing vs. Submaquila (Art. 21) in Mexico
Compare turnkey contract manufacturing, IMMEX Submaquila notices (RGCE 4.3.7), and Virtual Pedimentos (V1) for domestic processing.
Automotive Tier 1 & Tier 2 IMMEX Compliance: USMCA 75% RVC, LVC & V1 Transfers
Navigating the 4 USMCA automotive origin pillars, PROSEC Sector XIX, and virtual deliveries to terminal OEMs in Depósito Fiscal Automotriz.
Medical Device Manufacturing Under IMMEX: COFEPRIS, Sterilization & Cleanroom Scrap
Managing COFEPRIS Appendix 9 import permits, off-site ETO/Gamma sterilization submaquila, and mandatory Art. 109 destruction of rejected medical devices.
Mexico Steel & Aluminum Tariffs (15%–50%): IMMEX Annex II, Clave C6 & PROSEC / Regla Octava
How to eliminate 25%–50% Mexican steel and aluminum tariffs under USMCA Art. 2.5 using PROSEC and Regla Octava (98.02), and pass C6 Mill Test Certificate audits.
Related resources
- Full IMMEX Risk & Data Reconciliation Library (all English checklists & scenarios).
- Mexico cross-border logistics & live CBP border wait times.
- Anexo 31 Explained: VAT/IEPS credit system (SCCCyG).
- Mexico Importer of Record (IOR) explained for IMMEX shipments.
- Pre-shipment checklist before shipping parts or machinery to Mexico.
When the supplier and part are defined, use U.S. Import Compliance to organize the US entry responsibilities and evidence.