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. 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, and 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. Your customs broker still prepares and files it. The goal is that when a pedimento crosses your desk you can see the operation inside it, and catch a discrepancy before it compounds.

What a pedimento 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 fixed by law: 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.

The pedimento is also a data file. 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 Trámites de Comercio Exterior), which replaced the former VUCEM in 2026. One nuance surprises people: some printed fields are never transmitted electronically, and some transmitted data never appears on the printout. The document you hold is a rendering of that data file, and the data file is what the authority validates against.

Think of the pedimento as an x-ray of your operation. It makes the internal structure of the shipment visible: what the goods are, what they are worth, where they came from, under what regime they entered, and what was paid. The fields below are how you learn to read it and spot the fracture.

How a pedimento is laid out, block by block

A pedimento reads in blocks. The goal is to find each one quickly 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. Our guide to the six customs valuation methods in Mexico covers what happens when it cannot.

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, and the Incoterm directly shapes the customs value. This block is where the value you declared has 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 block 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, and cuotas compensatorias when an antidumping resolution applies. 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. The ACUSE ELECTRÓNICO DE VALIDACIÓN, an eight-character code, is the proof the authority received and processed the transmitted data.

The five pedimento fields where errors hide

Across a high volume of operations, the errors that turn into assessments and audits cluster in a handful of fields, and they are almost always fields the operation skips.

The first is the fracción arancelaria and its NICO. A misclassification here carries real consequences. 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 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 omission: freight, insurance, or an assist that should have been added to the price under articles 64 and 65 is left out. The declared VALOR ADUANA ends up lower than the law requires, which is undervaluation regardless of intent. The declared value also has to be supported: article 59 fracción III obliges the importer to hold the documentation proving the 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 goes undeclared, or is declared but 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.

All five share a pattern: each is a field most operations skip, 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, as shipped this time.
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 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 customs broker, and when to escalate to an audit

Discrepancies come in two sizes, and telling them apart keeps you from ignoring real exposure or overreacting to 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 follow a defined procedure, and on their own they point to an isolated slip.

The signals that call for a compliance audit 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 across many pedimentos. When the issue sits in the system, correcting one pedimento only postpones the finding, and the fix has to reach the process that produced it.

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 leaves the pedimento entirely to the broker discovers its errors the way SAT finds them, after the fact and with interest. An operation that learns to read it catches the same errors while they are still corrections.

The pedimento 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.

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