Carta porte — literally "bill of carriage" — is a mandatory digital document that Mexico's tax authority, the SAT (Servicio de Administración Tributaria), requires for goods transported on Mexican roads, rail, air, or water. Technically, it is a complemento carta porte, a supplement attached to the CFDI, Mexico's electronic invoice. For any U.S.–Mexico shipment, the Mexican leg of the move has to travel with a valid carta porte, which makes it one of the key documents in cross-border freight even though U.S. shippers never file it themselves.

This guide explains what carta porte is in plain English, why Mexico requires it, what data it contains, who actually issues it versus who supplies the information, the version history behind the "complemento carta porte" name, the risks of getting it wrong, and exactly what U.S. shippers need to do.

Why Mexico Requires the Carta Porte

Mexico's SAT introduced the carta porte requirement to create a digital trail for goods moving inside the country — tying every truck, railcar, vessel, or aircraft carrying freight to a specific CFDI and a specific set of verified shipment details. The goal is largely fiscal and regulatory: SAT wants to see what is moving, where it originated, where it is going, and who is responsible for it, which helps the agency reduce tax evasion, undervalued goods, and contraband moving on the country's transportation network.

It is worth being precise about what carta porte is not: it is not a customs entry document, and it is not filed with U.S. Customs and Border Protection. It is a Mexican tax and transportation compliance document that applies to movement inside Mexico. For a cross-border shipment, it works alongside — not in place of — the commercial invoice, the bill of lading, and any USMCA documentation used on the U.S. side.

What the Carta Porte Contains

A complete carta porte supplement captures a detailed picture of the shipment and the parties moving it:

  • Description, quantity, weight, and value of the goods being transported, including product codes recognized by SAT.
  • Origin and destination points, along with the specific route the shipment travels within Mexico.
  • Vehicle identification, including plate numbers and, for certain configurations, trailer and permit details.
  • Driver identification and the operating permit under which the carrier is authorized to run.
  • The parties involved in the movement — shipper, carrier, and receiver — and their tax identification information.
  • For international moves, data linking the shipment to the corresponding import or export operation.

Every one of these fields has to be accurate and internally consistent. A mismatch between the declared commodity and what is actually on the truck, or a route that doesn't match the vehicle's actual path, is exactly the kind of discrepancy an inspection is designed to catch.

Carta Porte in English: A Quick Glossary

Because carta porte is a Mexican regulatory term with no exact U.S. equivalent, a short glossary helps translate the concept for shippers used to U.S. paperwork:

  • Carta porte — literally "bill of carriage"; functions similarly to a bill of lading in that it documents a shipment in transit, but it is a tax compliance document, not a transportation contract.
  • Complemento — "supplement" or "addendum"; carta porte is a complemento attached to a CFDI, not a standalone invoice.
  • CFDI (Comprobante Fiscal Digital por Internet) — Mexico's mandatory electronic invoice format, roughly comparable to a U.S. digital receipt or invoice but tied directly into the tax system.
  • SAT (Servicio de Administración Tributaria) — Mexico's tax authority, similar in function to the U.S. Internal Revenue Service, and the agency that mandates and enforces carta porte.

With those terms in hand, "carta porte" translates cleanly: it's the tax-linked shipping supplement that documents a load moving on Mexican roads, tied to the carrier's electronic invoice.

Who Issues the Carta Porte vs. Who Supplies the Data

The Mexican carrier — the party actually transporting the goods — is responsible for generating the carta porte and attaching it to the CFDI before the shipment moves. That is a filing obligation that sits with the carrier, not with the U.S. shipper, the freight broker, or the receiver.

But the carrier can only issue an accurate carta porte with accurate data, and much of that data originates upstream — with the shipper's commodity description, quantities, and values, and with the logistics coordination that confirms route and vehicle details. In other words: the Mexican carrier files it, but the U.S. shipper and the parties coordinating the load are the source of the information that makes it correct.

Versions: Complemento Carta Porte 2.0 and 3.0

SAT has revised the technical specification behind the complemento carta porte more than once since introducing the requirement, and shippers will sometimes see references to specific version numbers — most commonly Complemento Carta Porte 2.0 and 3.0 — in carrier documentation or software. Each version has adjusted the required fields and validation rules SAT enforces, generally tightening the data requirements over time rather than loosening them.

Because SAT periodically updates the specification and enforcement timelines, the current version in active use is something to confirm with the Mexican carrier or licensed customs broker on your lane rather than assume from an older reference. What stays constant across versions is the underlying purpose: a verified digital record of the shipment tied to the carrier's CFDI.

Penalties and Risks of Errors

Carta porte compliance is enforced through roadside and checkpoint inspections inside Mexico. If a truck is stopped and its carta porte is missing, incomplete, or does not match the freight actually on board, the consequences can include the shipment being held for review, fines assessed against the carrier, and in more serious cases the goods or vehicle being detained until the discrepancy is resolved.

For a shipper, the practical risk is rarely a fine — it's the delay. A truck held at a checkpoint over a documentation mismatch misses its delivery window, disrupts the receiver's schedule, and can cascade into missed appointments on connected loads. This is why carta porte accuracy is treated as a scheduling issue as much as a compliance one.

What U.S. Shippers Specifically Must Do

U.S. shippers do not generate or file a carta porte — that responsibility belongs to the Mexican carrier. What falls on the shipper is making sure the information that carrier needs is accurate and available before the truck reaches Mexican roads:

  • Provide a precise, consistent commodity description — the same description that appears on your commercial invoice and packing list, not a generic catch-all.
  • Confirm quantities, weights, and values match across every document tied to the shipment.
  • Share destination and routing details early enough for the Mexican carrier to prepare the carta porte before pickup rather than at the border.
  • Flag any USMCA claim or special handling requirement so it's reflected consistently across the certification of origin, the invoice, and the carta porte.
  • Route questions about carta porte requirements for your specific commodity to the Mexican carrier or the licensed customs broker on the shipment.

How Carta Porte Fits with Other Cross-Border Documents

Carta porte is one piece of a larger paperwork stack. On a typical U.S.–Mexico shipment, it runs alongside the commercial invoice, the packing list, the bill of lading, and — for goods claiming duty-free treatment — the USMCA certification of origin. Our guide to the documents behind a cross-border shipment walks through how all of these pieces relate, and shipping freight to Mexico covers where carta porte fits into the step-by-step process.

OTX Logistics Group is a non-asset freight brokerage. As part of cross-border freight coordination through crossings like Laredo, El Paso, and Otay Mesa, we help align the shipment data a Mexican carrier needs to issue an accurate carta porte, alongside the rest of the documentation the load requires. OTX does not issue carta porte documents or provide customs brokerage; carta porte is issued by the Mexican carrier, and customs clearance is handled by the licensed customs brokers we coordinate with.

Planning a lane into Mexico and want to make sure your shipment data is ready for the carrier? Request a quote and we'll help you get the documentation aligned from the start.