NICO: The Last 2 Digits of Your Mexican Tariff Code Explained | Joffroy

The first eight digits decide what you pay. The last two decide whether the authority believes what you declared.

A Mexican tariff classification has ten digits. Most import teams only think about the first eight. The last two, the NICO, rarely get the same scrutiny, and that is precisely where a quiet category of exposure lives.

The NICO does not change your duty. It changes something that matters over the full life of an import program: how clearly, and how truthfully, your declaration reads to the authority. This is a working explanation of what the NICO is, why it carries more weight than its two digits suggest, and how to keep it from becoming the soft spot in an otherwise clean filing.

What the NICO actually is

The NICO, or Número de Identificación Comercial (commercial identification number), is the final pair of digits in a Mexican tariff classification. The first eight digits are the fracción arancelaria (the tariff fraction) drawn from the TIGIE, Mexico's tariff schedule. The NICO adds two more, taking the full code to ten digits. On the Pedimento (Mexico's customs declaration), the complete ten-digit code is what identifies the good.

The NICO entered Mexican classification when the new LIGIE (Ley de los Impuestos Generales de Importación y de Exportación) took effect at the end of 2020. That law was published in the Diario Oficial de la Federación on July 1, 2020, Mexico's federal gazette, and took effect 180 calendar days later, on December 28, 2020, adopting the World Customs Organization's Sixth Amendment to the Harmonized System. The LIGIE in force today is the version that adopted the Seventh Amendment, published in the DOF on June 7, 2022 and effective December 12, 2022. It replaced the 2020 law and kept the NICO in place. The legal seat of the NICO is Article 2, fracción II, regla complementaria 10ª of the LIGIE.

The numbers run progressively from 00 to 99 under each tariff fraction. One detail anchors everything that follows: the NICO does not set the tariff, and it does not by itself trigger non-tariff regulations. The eight-digit fraction does that work. The NICO sits one layer below, describing the specific merchandise inside a fraction with more precision than the fraction alone allows.

Why the last two digits carry weight

On paper, the NICO is a statistical refinement, two digits added so that Mexico can produce sharper foreign-trade data. In practice, it is how the authority sees the specific good you moved, not merely the category it belongs to. That difference is the whole point.

A tariff fraction can cover a broad family of goods. The NICO narrows the lens to a particular article within that family. When the data is read in aggregate, this produces cleaner trade statistics. When it is read against a single operation, it gives the authority a more exact picture of what crossed the border, declared item by declared item.

That precision cuts both ways. The same granularity that improves national statistics also sharpens the tools the authority uses to detect subvaluación (undervaluation), misclassification, and goods caught in trade-remedy measures. A more precise identifier makes a correct declaration more legible and an incorrect one more conspicuous. The part of the code many teams treat as an afterthought is the part that makes the declaration easy to read, or easy to question.

How the NICO is built and where it lives

The Secretaría de Economía creates and modifies NICOs, and publishes them in the DOF through formal acuerdos together with their correlation tables (the tables that map fractions to their valid NICOs). The most recent consolidated NICO acuerdo and correlation tables were published in the DOF on August 22, 2022. The operative reference point for day-to-day work is the SNICE, the Secretaría de Economía's Servicio Nacional de Información de Comercio Exterior, where the current NICOs and correlation material are published and kept up to date.

Finding the right NICO is a two-step move, not a guess. First, classify the good to its eight-digit fraction. Then read the valid NICOs published under that fraction and select the one whose description matches the actual merchandise. Because dependencies and interested parties can request the creation or modification of a NICO, the set under a given fraction is not frozen. A NICO that was correct last year can be split, retired, or supplemented, which is why validation is a recurring task, not a one-time setup.

Quick check: Pull five of your highest-volume fractions and confirm, against the current SNICE listing, that the NICO your team files under each one still exists and still matches the goods you actually import. If nobody on the team can say when that was last verified, you have found your first action item.

The exposure most teams miss

Here is the distinction that should change how a compliance team thinks about the ten-digit code.

A wrong fraction is a classification error. The eight digits are off, which usually means the duty is wrong and the applicable non-tariff regulations may be wrong too. Most operations already treat this as serious, because the financial and regulatory consequences are obvious.

A wrong NICO on a correct fraction is a different kind of exposure. The duty is right, the fraction is right, and yet the merchandise you declared is not the merchandise you moved. Nothing in the duty calculation flags it. What is wrong is the accuracy of the data the authority relies on to identify the good. The declaration is internally inconsistent: a correct category attached to an incorrect description of the item inside it.

This is the exposure that hides in plain sight. Teams audit the fraction because the fraction drives the money. The NICO drives the description, and a description that does not match reality is exactly the kind of discrepancy a more precise identifier is designed to surface.

Four misconceptions worth retiring

1. “The NICO is just for statistics, so it does not really matter.” It is true that the NICO was introduced for statistical precision. It is not true that statistical precision is harmless to the filer. The same precision that improves the data also improves detection.
2. “If the duty is right, the NICO is irrelevant.” The duty can be perfectly correct while the NICO is wrong. That does not make the declaration correct. It makes it a right number attached to a wrong description.
3. “The broker handles the NICO, so we do not need to check it.” The broker files it, but the broker classifies from the information the importer provides. The match between the NICO and the real good depends on product data that originates upstream, inside your operation, not at the customs house.
4. “A NICO never changes.” NICOs are created and modified by the Secretaría de Economía and republished in the DOF. The correct NICO for a product can change between import programs, which is why a NICO validated once is not validated forever.

What good NICO validation looks like

A disciplined operation validates the NICO before the Pedimento is filed, not after a review raises the question. That means mapping each fraction in the import portfolio to its current valid NICOs using the SNICE and the published acuerdos, confirming the selection at the SKU level rather than at the category level, and capturing that detail upstream, at the purchase order and in the product master, so the right ten-digit code travels with the good instead of being reconstructed at clearance. It also means reconciling against NICO updates on a set cadence, because the catalog moves.

Across more than 190,000 customs operations a year at 39 or more ports, with a 99.8% clearance accuracy rate built over 122 years at this border, the pattern we see is consistent: the NICO discrepancies that surface in review are almost never clearance problems. They are upstream data problems. The fix lives in how product information is captured and maintained long before the truck moves, which is also why the operations that rarely get caught by NICO inconsistencies are the ones that treat the last two digits as part of product master data, not as a field the broker fills in at the end.

The point at which it pays to bring in expert review is straightforward: when the import portfolio is large enough that no one can confidently say the NICO catalog has been reconciled recently, when product lines change often enough that descriptions drift, or when an audit or a hold has already raised a question about how goods were identified. At that point, a structured NICO and classification review is cheaper than the alternative.

The first eight digits decide what you pay. The last two decide whether the authority believes what you declared. Give the NICO the same discipline you give the fraction, and it becomes what it was designed to be: a precise description of what you actually moved, not a question mark hanging over it.

TRADE. UNDER CONTROL.

Talk to a Joffroy expert about a classification and NICO validation review for your highest-volume fractions, before your next filing season, not after a hold.