A previo is a pre-clearance physical inspection of cargo, done by the agente aduanal's team before the pedimento is filed, to verify quantities, part numbers, labeling, and serial numbers against the paperwork. It usually happens at a border warehouse and adds a scheduled stop to the crossing.
A previo (short for reconocimiento previo) is the physical check an agente aduanal performs on cargo before filing the pedimento. The agente's staff open the shipment, count pieces, verify part numbers and serial numbers, check NOM labeling, and confirm everything matches the commercial invoice and packing list. It exists because the agente is personally liable for the pedimento's accuracy, so they verify before they certify.
Previos are most common on southbound freight entering Mexico, and typically happen at a border warehouse or cross-dock on the U.S. side, though export previos northbound also occur for sensitive commodities.
Build the previo into your schedule, not around it. It is a physical stop: the trailer gets docked, opened, inspected, and resealed, which can take hours depending on the warehouse queue and how well documents match the freight. Loads that arrive with clean, itemized packing lists move through previo fast. Loads with vague descriptions, mixed SKUs, or labeling problems stall, and every hour at the previo warehouse is an hour of detention risk. If a shipper tells you their agente 'requires previo on everything,' quote transit accordingly. It is a sign of document discipline, and it usually means fewer red-light surprises inside the aduana.
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