Independent editorial resource
IMMEX Audit Tools, Validators & Calculators
Interactive client-side IMMEX audit tools for US manufacturers: Anexo 24 vs. Data Stage reconciliation, SCCCyG (.txt) validator, Maquiladora Safe Harbor (6.9% / 6.5%) calculator, and pre-shipment risk checkers.
All tools and validators on ammex.org.mx run 100% locally in your web browser. No CSV extracts, SCCCyG .txt files, or financial inputs are ever uploaded to a server. Use these utilities to audit your data and structure technical questions before engaging with your Mexican customs broker, tax counsel, or IMMEX software provider.
Choose an import question in the U.S. Import Compliance Hub, or browse the existing visual explanations.
Data Reconciliation, SCCCyG & Tax Modeling
Interactive Audit Validators & CFO Calculators
Anexo 24 vs. Pedimento (Data Stage) Reconciliation Tool
Upload or paste two CSV/TSV/pipe-delimited extracts (Anexo 24 inventory ledger vs. broker pedimentos or SAT Data Stage Tables 501/551) locally in your browser to catch missing pedimentos and value variances.
SCCCyG (Anexo 30 / 31) .txt Discharge Report Validator
Validate Record Types 01, 09, 02, 03, 04, and 07, left-zero padding, destination keys, and cross-period duplicate pedimentos locally in your browser before uploading to SAT.
Maquiladora Safe Harbor (6.9% / 6.5%) & Shelter Calculator
Calculate mandatory Mexican taxable profit under Article 182 LISR (6.9% on assets vs. 6.5% on costs) and model 3-year Shelter vs. Standalone IMMEX operating costs.
Pre-Shipment & Diagnostic Checklists
Readiness & Ledger Screening Tools
Mexico Import Risk Checker
Screen importer identity, RFC, Padrón de Importadores, 10-digit NICO classification, NOMs, broker coordination, and IMMEX route before shipping.
IMMEX Data Mismatch Self-Test
Audit ERP, warehouse, customs broker, Anexo 24, and Anexo 31 (SCCCyG) records to pinpoint where your five ledgers are drifting apart.
Before Shipping to Mexico Checklist Generator
Generate a tailored pre-shipment customs compliance checklist based on shipping route, product type, and importer readiness.
Searchable Statutory Databases
Anexo 22 & Pedimento Code Lookup Hubs
Anexo 22 Appendices: 18 Searchable SAT Pedimento Catalogs
Instant browser lookup across all official SAT Anexo 22 records: Appendix 8 Identifiers (CI, TL, PROSEC, V1), Appendix 7 UMT Units, Appendix 13 Payment Methods, and Customs Ports.
Pedimento Operation Codes Hub (A1, IN, RT, V1, AF, F4, F5, A3, R1, CT)
Interactive lookup and 12 deep-dive guides for the operation keys that govern Mexican customs regimes, VAT credits, and Anexo 24 discharges.
Educational use only
This page is an educational screening aid only. It is not legal, tax, customs, accounting, brokerage, or government guidance. Do not rely on any result as legal or tax advice. Confirm findings with your Mexican importer, customs broker, tax advisor, or qualified IMMEX specialist.