Cross-border LTL,
without the border
surprises.

How the move actually works

A US-to-Mexico LTL shipment is really two shipments wearing one label. A US carrier moves the freight to a border gateway — Laredo handles the lion's share, with El Paso, Otay Mesa, and Pharr covering western and Gulf lanes. At the border, the shipment clears Mexican customs and transfers — usually to a Mexican carrier, sometimes via a transfer company that shuttles trailers across the bridge. Then it rides a Mexican LTL network to final delivery.

That handoff is the defining fact of cross-border LTL. It's where transit time is won or lost, where liability changes hands, and where freight sits if the paperwork isn't ready. Everything on this page is about making that handoff boring.

The paperwork

• Commercial invoice. The document customs actually cares about: accurate values, complete commodity descriptions, and correct harmonized (HS) codes. Vague descriptions and lowball values are the top causes of border holds.
• Bill of lading and packing list. Counts and weights must match the invoice exactly — a mismatch at the border is a delay, not a shrug. Our BOL guide covers the fundamentals.
• USMCA certification of origin. If your goods qualify as North American origin, this claim is what makes them duty-free. It's not automatic — the goods must meet the USMCA rules of origin, and the certification can come from the exporter, producer, or importer.
• Carta porte. Mexican regulations require carriers to carry a carta porte supplement (a digital waybill complement) for freight moving within Mexico. It's generated on the Mexican side from your shipment data — another reason clean, complete paperwork matters before the freight ships.

The customs broker — the step shippers miss

Mexican customs entries are filed by a licensed Mexican customs broker, the agente aduanal — and the importer of record appoints them, not the shipper and not the carrier. If your customer in Mexico doesn't have a broker engaged, your freight will arrive at the border and stop. Before anything ships: confirm the broker's name and contact, confirm they have the shipment documents, and confirm your consignee has settled how duties and the broker's fees get paid. On the US side, an export filing (EEI) is required for many shipments valued over $2,500 per commodity — your 3PL or forwarding partner handles the mechanics, but the data comes from your invoice.

Liability changes at the border

US carrier liability — already limited, as our insurance guide explains — generally ends at the border transfer. Once freight is moving under Mexican law, carrier liability is commonly capped at a statutory per-ton amount that works out to a small fraction of most cargo values. The practical answer isn't to negotiate liability; it's all-risk cargo insurance covering the entire door-to-door move, priced into the shipment from the start. For cross-border freight this isn't a nice-to-have — it's the only meaningful coverage you'll have south of the river.

Transit, pricing, and planning

• Add border time to the estimate. Figure the US linehaul to the gateway, plus commonly a day or more for clearance and transfer, plus Mexican linehaul to destination. Clean paperwork keeps the middle number honest; a broker problem turns it into a week. (Standard transit-time rules still apply on both legs.)
• Quote it as one move. Piecing together a US carrier, a transfer company, and a Mexican carrier yourself means three vendors and three finger-pointing opportunities. A 3PL quotes the through-move, coordinates the handoff, and owns the tracking across it.
• Class and density still rule the US leg. Your freight rates under normal NMFC class rules to the border — everything in our LTL pricing guide applies. Volume-sized cross-border freight may pencil better as a partial or full truckload straight through.
• Package for two networks. The freight gets handled at origin, at the transfer, and on the Mexican network — palletize like it's going twice as far, because it effectively is.

How the Fox runs it

We quote US–Mexico moves as one shipment: US linehaul, border transfer, Mexican delivery, and the document checklist confirmed up front — including that your consignee's customs broker is engaged before pickup, not after the freight hits Laredo. FoxIQ tracks the shipment through the handoff, and every invoice is audited against the quote, on both sides of the border. Shipping north instead? Read the US to Canada LTL guide — a friendlier border with different rules.