How to Read a Mexican Pedimento, Field by Field: The Blocks Where Errors Hide

The pedimento is the one document that proves your import was legal. It is the declaration your operation signs, the record SAT audits against, and the version of your shipment the authority actually sees. And most of the people who sign off on it read three fields: the importer, the value, and the total to pay. The pedimento has dozens of fields. The ones that go unread are, with remarkable consistency, the exact ones an audit reads first.

This is a field-by-field guide to reading your own pedimento the way the authority reads it. Not to replace your customs broker, but so that when a pedimento crosses your desk you can see the operation inside it, and catch the discrepancy before it compounds.

What a pedimento actually is

The pedimento is Mexico's customs declaration, the legal instrument that destines your goods to a customs regime and declares everything the authority taxes and regulates them by. Its structure is not improvised: the instructivo de llenado is published as Anexo 22 of the Reglas Generales de Comercio Exterior (RGCE) for 2026, issued for the purposes of articles 2 fracción XVI, 6, 36, 36-A, 37, 37-A and 39 of the Ley Aduanera and article 6 of its Reglamento. Every field has a defined meaning and a defined appendix it draws its codes from.

It is also not just a printout. The information is transmitted to the Sistema Electrónico Aduanero through prevalidación and validación before the goods are presented, today through the VUTCE (Ventanilla Única de Transparencia y Comercio Exterior), which replaced the former VUCEM in 2026. One nuance that surprises people: not everything printed on the pedimento is transmitted electronically, and not everything transmitted is printed. The document you hold is a rendering of a data file, and the data file is what the authority validates against.

Think of the pedimento as an x-ray of your operation. It is the internal structure of the shipment made visible: what the goods are, what they are worth, where they came from, under what regime they entered, and what was paid. You can look at an x-ray and see nothing, or you can learn to read it and see the fracture. The fields below are how you learn to read it.

How a pedimento is laid out

A pedimento reads in blocks. You do not need to memorize all of them, but you should be able to find each one and know what it is telling you.

The header identifiers sit at the top. NUM. PEDIMENTO is the unique number of the operation. T. OPER states the type: IMP for importation, EXP for exportation or return, TRA for transit. CVE. PEDIMENTO is the clave de pedimento, the code (drawn from Apéndice 2) that says what kind of operation this is, for example a definitive importation versus a temporary IMMEX entry. RÉGIMEN states the customs regime the goods are destined to, from Apéndice 16. These four fields together tell you what the operation legally is before you read another line.

The value block is where the money is declared. VALOR ADUANA is the customs value, the base most contributions are calculated on. It is built from the price paid (VALOR COMERCIAL or precio pagado) plus the INCREMENTABLES and OTROS INCREMENTABLES, the amounts that must be added to the price under articles 64 and 65 of the Ley Aduanera (freight, insurance, certain assists and commissions), and minus the DECREMENTABLES allowed under article 66. TIPO CAMBIO records the peso-dollar exchange rate applicable on the date set by article 56. VINCULACIÓN states whether the buyer and seller are related parties, which directly affects whether the transaction value can be used as declared.

The invoice block ties the declaration to the tax document. NÚM. CFDI O DOCUMENTO EQUIVALENTE links the pedimento to the CFDI or equivalent invoice, and MONEDA FACT, VAL. MON. FACT and FACTOR MON. FACT record the invoice currency, its value, and the conversion factor to dollars. INCOTERM records the agreed delivery term under regla 3.1.8. This block is where the value you declared is supposed to reconcile with the value you invoiced.

The parties block carries identity. The importer or exporter RFC, RAZÓN SOCIAL and DOMICILIO, and the supplier or buyer abroad. This is the block that also connects to the Padrón de Importadores and, where required, the Padrón de Importadores de Sectores Específicos.

The partida level is where the goods themselves are described, line by line. Each partida carries the fracción arancelaria and its NICO (Número de Identificación Comercial), the unit of measure (UMC and UMT), the quantities, the unit value, and the contributions calculated on that line: IGI, IVA, DTA, IEPS where applicable. This is the most information-dense part of the document and the part most worth slowing down on.

Finally, the control fields. IDENTIFICADORES (from Apéndice 8) carry the flags that signal special treatments, programs, and certifications applied to the operation. The link to the Anexo 24 inventory control system matters for any IMMEX operation. And the ACUSE ELECTRÓNICO DE VALIDACIÓN, an eight-character code, is the proof the authority received and processed the transmitted data.

The blocks where errors hide

Now the payoff. Across a high volume of operations, the errors that turn into assessments and audits do not scatter randomly across the pedimento. They cluster in a handful of fields, and they are almost always fields the operation never reads.

The first is the fracción arancelaria and its NICO. A misclassification here is not a cosmetic error. The fracción determines the duty rate, whether a NOM applies, whether a permiso previo or a padrón sectorial is required, and whether the goods are even eligible for the regime declared. A wrong fracción can mean underpaid contributions and an omitted regulation at the same time, and it exposes the operation to infracciones under the Ley Aduanera for inexact or omitted data. This is the single field most worth verifying against the actual product, every time a new SKU appears.

The second is the customs value, specifically the incrementables. The most common valuation error is not fraud, it is omission: freight, insurance, or an assist that should have been added to the price under articles 64 and 65 quietly was not. The declared VALOR ADUANA ends up lower than the law requires, which is undervaluation regardless of intent. And the value you declared has to be supported: article 59 fracción III obliges the importer to hold the documentation proving the declared value was determined correctly, which is what the Manifestación de Valor backs. If the value block does not reconcile with that backing, the gap is visible.

The third is vinculación. If the buyer and seller are related and that relationship is not declared, or is declared but the relationship influenced the price, the transaction value method can be challenged and the whole valuation reopened. It is a single yes-or-no field with disproportionate consequences.

The fourth is the régimen and the clave de pedimento. Declaring a definitive importation where a temporary IMMEX entry was intended, or the wrong clave within IMMEX, changes the tax treatment of the goods and, for IMMEX operations, breaks the reconciliation with the Anexo 24 inventory system. An Anexo 24 mismatch is one of the most common findings that turns a routine review into an audit.

The fifth is the reconciliation between the CFDI value and the declared value. Because the pedimento is now tightly linked to the CFDI, the authority can cross-check the invoice value against the declared value automatically. A gap between what was invoiced and what was declared, even an innocent one from a credit note or a late adjustment, is exactly the kind of inconsistency that flags an operation for a closer look.

The pattern holds across all five: each is a field most operations do not read, and each is a field SAT reads first.

Quick check for your next pedimento: 1) Pull the fracción arancelaria and NICO on each partida and confirm they match the actual product, not last shipment's product. 2) Confirm the incrementables include freight and insurance where the INCOTERM requires it. 3) Check that VINCULACIÓN is answered correctly for related-party suppliers. 4) Confirm the clave de pedimento and régimen match the operation you actually ran. 5) Compare the VAL. MON. FACT against the CFDI and against VALOR ADUANA, and make sure the three reconcile. Five fields, five minutes, and you will have looked where the audit looks.

When to ask your broker, and when to escalate to an audit

Not every discrepancy is a crisis, and knowing the difference keeps you from either ignoring real exposure or panicking over a clerical fix.

A single pedimento with a transposed figure, a missing identificador, or a value that needs a small adjustment is a conversation with your customs broker, and often a rectificación. These are normal, they have a defined procedure, and they do not by themselves indicate a systemic problem.

The signals that call for a compliance audit rather than a one-off correction are patterns: the same fracción applied inconsistently across shipments, incrementables that are routinely lighter than the commercial terms imply, repeated Anexo 24 mismatches in an IMMEX operation, or a structural gap between invoiced and declared values that shows up across many pedimentos. When the issue is in the system rather than the single document, correcting one pedimento does not fix the exposure, it just postpones the finding.

The bigger picture

The pedimento is the unit of truth in Mexican trade. Across more than 190,000 customs operations a year at 39+ ports, it is the one document that has to be right regardless of the product, the regime, or the port, because it is the version of every shipment the authority sees. An operation that treats the pedimento as paperwork the broker files will keep discovering its errors the way SAT finds them, after the fact, with interest. An operation that learns to read it catches the same errors while they are still corrections.

The pedimento is not paperwork. It is the legal story of your import, told one field at a time, and you have been signing it. Learn to read the fields you have been skipping, because those are the fields that get read on the other side.

If you want a second set of eyes on the blocks where your pedimentos tend to drift, talk to a Joffroy expert about a pedimento audit.

TRADE. UNDER CONTROL.

‍