Automated Manifest System (AMS)

The Automated Manifest System (AMS) is an electronic data interchange system operated by U.S. Customs and Border Protection (CBP) that receives cargo manifest information from ocean carriers, airlines, and rail operators before goods arrive in the United States. AMS allows CBP to screen inbound shipments for security risks and regulatory compliance before the vessel docks, the aircraft lands, or the train crosses the border. Carriers are legally required to transmit manifest data through AMS within specific timeframes, and failure to comply results in penalties and cargo holds.

How AMS Functions

When an ocean carrier books cargo for transport to a U.S. port, the carrier or its agent transmits the bill of lading data to CBP through AMS. This data includes the shipper name and address, consignee name and address, notify party, description of goods, weight, piece count, container number, seal number, and the port of loading and discharge. For ocean freight, this information must be transmitted at least 24 hours before the cargo is loaded onto the vessel at the foreign port. This is the “24-Hour Rule,” implemented after September 11, 2001, as part of heightened supply chain security measures.

Air cargo has a shorter filing window. AMS data for air shipments must be transmitted before departure or, for certain routes, at least four hours prior to arrival at the first U.S. airport. Rail carriers transmit AMS data at least two hours before the train arrives at the U.S. border crossing.

AMS and the Importer Security Filing (ISF)

AMS works in tandem with the Importer Security Filing, commonly called “10+2.” While AMS collects carrier-level data (who is shipping what, on which vessel, to which port), the ISF collects importer-level data (manufacturer name and address, seller, buyer, ship-to party, HTS classification, and container stuffing location). Both filings are required for ocean shipments and both must be submitted before specific deadlines. The ISF is filed by the importer or their customs broker, while the AMS manifest is filed by the carrier or a licensed AMS filer.

If the AMS data and the ISF data conflict (for example, different consignee names or mismatched container numbers), CBP may issue a hold on the shipment, delaying release until the discrepancy is resolved. Keeping both filings consistent requires coordination between the freight forwarder, the carrier, the customs broker, and the importer.

AMS Hold and No-Load Scenarios

CBP uses AMS data to run risk assessments through its Automated Targeting System (ATS). If a shipment is flagged, CBP can issue a “no-load” instruction, preventing the cargo from being loaded onto the vessel at the foreign port. This is distinct from a “hold” at the U.S. port, where the cargo arrives but cannot be released until CBP clears it. No-load orders are serious. They require the shipper to provide additional documentation or submit to an inspection at the origin port before the cargo can proceed.

A “1C” hold in AMS means the shipment requires a customs exam at the destination port. A “freight hold” means the carrier has not fulfilled its AMS filing obligations and the cargo cannot be released until the manifest is properly transmitted and accepted. These holds can add days to the supply chain and increase costs through demurrage, detention, and expedited exam fees.

Who Files AMS

Ocean carriers, NVOCCs (Non-Vessel Operating Common Carriers), and licensed AMS filers are authorized to transmit AMS data. Freight forwarders operating as NVOCCs file their own house bills of lading through AMS, while the ocean carrier files the master bill. For Amazon sellers and e-commerce importers, AMS filing happens behind the scenes. The seller’s freight forwarder and the ocean carrier handle the transmission. However, the accuracy of AMS data depends on the information provided by the shipper and the importer. Providing your freight forwarder with correct consignee details, accurate cargo descriptions, and verified container information ensures the AMS filing goes through cleanly and the shipment does not encounter avoidable holds at the U.S. port.