A load from Ontario to Monterrey crosses two international borders and travels more than 2,500 kilometres through the United States, but it never enters US commerce. No US duties are paid and no US customs entry is made, because the freight is only passing through. That is possible because of the in-bond system, and in-bond freight is unforgiving of mistakes: every step is reported to US Customs and Border Protection (CBP), on a clock, against the carrier’s customs bond.

In short

  • Canada–Mexico freight usually crosses the US under a Transportation and Exportation (T&E) in-bond, moved by a carrier that holds a US customs bond.
  • The freight must reach its US port of exit within 30 days, and arrival and export are each reported electronically within two business days.
  • The Mexican import side, with its broker, importer registration and transport documents, has to be ready before the truck reaches the border.

What “in-bond” means

When goods enter the US under bond, CBP lets them move to another port without being formally entered and without duties paid, because they are under the custody of a bonded carrier. There are three main types:

  • Immediate Transportation (IT): the goods move to an inland US port, where they are formally entered.
  • Transportation and Exportation (T&E): the goods cross the US and leave it again, for example Canada to Mexico. This is the standard type for through-freight.
  • Immediate Exportation (IE): the goods are exported from the same port where they arrived.

The movement has to be made by a carrier with a US customs bond that covers in-bond cargo. That is what “bonded carrier” means, and it is why the carrier’s own filings, not just the broker’s, decide whether these loads move.

The rules that govern every move

CBP overhauled in-bond processing, and since 2019 every in-bond arrival, export and diversion has to be reported electronically in ACE. The key requirements:

  • Thirty days to the port of exit. In-bond freight must reach its destination port within 30 days of the in-bond being authorized.
  • Report the arrival. The carrier reports the arrival at the destination port within two business days.
  • Report the export. The export is reported within two business days of the goods leaving the US.
  • Ask before you divert. If the freight needs to exit through a different port than the one on file, the diversion is requested electronically, before the truck changes route.

Missed reports aren’t paperwork trivia. CBP can assess liquidated damages against the carrier’s bond, and a carrier with a pattern of late in-bond reporting loses the credibility that keeps its trucks moving.

Crossing into Mexico

Most Canada–Mexico freight leaves the US through Texas. Laredo handled close to half of all US–Mexico truck freight in 2025. Crossings such as El Paso, Pharr, Eagle Pass, Nogales and Otay Mesa handle much of the rest, depending on where in Mexico the freight is going.

On the Mexican side, the import has its own requirements, and they need to be in place before the truck arrives:

  • A licensed Mexican customs broker (agente aduanal) files the import declaration, known as the pedimento.
  • The Mexican importer must be registered in Mexico’s importer registry, the Padrón de Importadores.
  • Goods moving on Mexican highways need the electronic transport document, an invoice (CFDI) with the Carta Porte complement.
  • USMCA treatment requires a valid certification of origin. Our USMCA review explainer covers what is changing in the agreement.

Northbound freight from Mexico to Canada runs the same way in reverse: T&E through the US, then CBSA’s ACI eManifest and PARS at the Canadian border, covered in our PARS and PAPS guide.

Where Canada–Mexico loads go wrong

  • The in-bond wasn’t set up before the US crossing. The truck reaches the US border with a load destined for Mexico and no in-bond on file. It waits until one is.
  • The exit port changed and nobody asked CBP. A consignee asks for a different crossing, the truck reroutes, and the in-bond still names the old port.
  • The seal story doesn’t match. In-bond freight should stay sealed from origin to exit, with the seal number on the documents. A seal that changes without a record invites an inspection. The seal discipline behind CT-PAT matters doubly on in-bond freight.
  • Arrival or export never got reported. The freight is in Monterrey, but in ACE it is still in Texas, and the bond carries the exposure.
  • The Mexican side wasn’t ready. The pedimento isn’t filed, the importer’s registration has lapsed, or the invoice doesn’t match the load. The trailer waits at the border while the paperwork catches up.

How Alpha Trans services Mexico

We service freight all the way to and from Mexico. We are a bonded carrier in Canada and the USA. Your freight stays in our trailer and under our insurance for the whole move, with one carrier relationship and one dispatch number from the dock in Ontario to the final destination. Our dispatchers set up the in-bond before the truck reaches the US border, report arrival and export inside CBP’s windows, and work with your brokers on both sides so the Mexican paperwork is ready before the trailer arrives. Our cross-border service covers how we run these lanes.

A Mexico load is three customs systems and one trailer. Talk to dispatch about your Canada–Mexico freight.

Filed under Border & customs

Cover photo: Quintin Gellar via Pexels