7 Things That Delay Your Shipment at the Mexican Border (and How to Fix Them)

1. Incomplete or incorrect documentation

The #1 cause of delays. Mexican customs requires the commercial invoice, packing list, bill of lading, and (if applicable) certificate of origin, NOM certificates, and import permits — all BEFORE clearance begins. Missing even one document means your shipment sits while you scramble to get it.

Fix: Send ALL documents to your broker 48-72 hours before the shipment arrives at the border. Use a checklist. Camtom Docs can extract data from your documents automatically so your broker has clean, structured data.

2. Wrong tariff classification

If your broker classifies your product incorrectly and customs catches it during inspection (reconocimiento aduanero), the shipment gets held for reclassification. This can take days and result in additional duties owed or penalties.

Fix: Classify your products BEFORE shipping — not at the border under time pressure. Use Camtom TariffPro (95% accuracy) and share the results with your broker.

3. Missing NOM certification

If your product requires NOM certification and you don't have it, customs will not release the goods. Period. There's no way to expedite NOM certification at the border — it must be done before you ship.

Fix: Check NOM requirements as part of your classification process. TariffPro flags applicable NOMs for every fracción arancelaria.

4. Reconocimiento aduanero (random inspection)

Mexico uses a 'semáforo' (traffic light) system. Green = clear without inspection. Red = physical inspection. You can't control which color you get, but you can minimize the impact by ensuring your documentation is perfect and your cargo matches the declaration exactly.

Fix: Ensure your packing list matches the physical cargo exactly. Any discrepancy (wrong count, wrong weight, undeclared items) triggers fines and extended holds.

5. MVE not filed (mandatory by regime from November 2026)

Once the MVE is mandatory for your regime — January 15, 2027 for definitive imports, January 1, 2027 for temporary imports — no MVE = no clearance. The Electronic Value Declaration must be filed in VUCEM before your broker can submit the pedimento. If you don't have an e.firma or haven't generated the MVE, your shipment waits.

Fix: Set up MVE before it becomes mandatory for your regime. Camtom generates the MVE in under 3 minutes — no VUCEM portal login needed.

6. VUCEM system downtime

Mexico's electronic customs portal (VUCEM) occasionally experiences outages and latency issues. When VUCEM is down, no one can file pedimentos or transmit documents — affecting all imports nationwide.

Fix: Build buffer time into your logistics. Don't plan for same-day clearance. Camtom connects to VUCEM via API and can retry automatically when the system comes back up.

7. Undervaluation flagged by SAT

Mexico's SAT maintains reference price databases. If your declared customs value is significantly below their reference, your shipment gets flagged for a PAMA (administrative investigation). This can result in seizure of goods, fines, and weeks of delay.

Fix: Declare the real transaction value. Don't undervalue to save on duties — the risk far outweighs the savings. Use USMCA to reduce duties legitimately instead.