What is Automated Manifest System?
The Automated Manifest System (AMS) is the US Customs and Border Protection electronic system through which carriers and certain intermediaries transmit advance cargo manifest data for goods arriving in the United States. It implements Section 343(a) of the Trade Act of 2002, which requires advance electronic cargo information for all transport modes so that CBP can risk-assess shipments before arrival. For ocean freight the cargo declaration must reach CBP 24 hours before the cargo is laden aboard the vessel at the foreign port, often called the 24-hour rule. Licensed NVOCCs with an international carrier bond may file their house bill data directly into vessel AMS, otherwise the ocean carrier files on their behalf. Comparable advance filing regimes exist elsewhere, including the EU's Import Control System 2 (ICS2) and Canada's Advance Commercial Information program.
Why it matters for forwarders
For a forwarder the practical question is who files the house-level data: if the NVOCC does not self-file, the master carrier's filing must still match the house bills, and mismatches lead to holds. Missing the 24-hour window can result in a do-not-load message at origin, a rolled container and penalties, so documentation cut-offs at origin must be set well ahead of vessel loading. Cargo descriptions must be precise; generic terms such as 'general merchandise' or 'FAK' are not acceptable descriptions and attract scrutiny. AMS is separate from the Importer Security Filing (ISF, or 10+2), which is the importer's responsibility, also due 24 hours before lading for ocean cargo; both must be consistent. Air, rail and truck have shorter advance windows tied to arrival, so air forwarders need their house data transmitted before departure on short flights.