AMS (Automated Manifest System): Deadlines & Process

AMS (Automated Manifest System) is the electronic reporting system of U.S. Customs and Border Protection (CBP) through which carriers submit shipment data before the shipment arrives in the U.S. This process is based on the manifest—that is, the list of all goods on board a ship, aircraft, train, or truck. CBP automatically screens this data for security risks before the goods reach the country—in the case of maritime transport, even before the container is loaded onto the ship at the port of departure.

In logistics, AMS also refers to the Asset Management System, a software solution for managing assets and equipment. This article focuses on the Automated Manifest System.

Why the Automated Manifest System Exists

Before 2002, cargo data bound for the U.S. was primarily reported on paper, and most shipments were not assessed until their arrival. With the Trade Act of 2002, U.S. Customs and Border Protection (CBP) was mandated to require advance electronic information for all modes of transportation. The so-called 24-hour rule for maritime traffic marked the beginning of this process. Since March 4, 2004, all shipping companies calling at U.S. ports have been required to submit their cargo data electronically via AMS.

The goal is risk assessment, not customs clearance: CBP cross-checks the manifest data against its databases to identify suspicious shipments before they are en route. The actual import clearance process, involving customs value and duties, is a separate step.

How AMS Works

The process follows the same principle across all modes of transport:

Collect data: The shipper and freight forwarder provide the shipment data—including the shipper, consignee, a detailed description of the goods, number of packages, weight, and container and seal numbers.
Submit the manifest: The carrier (shipping line, airline, rail, or trucking company) transmits the manifest electronically to CBP. If a freight forwarder, acting as an NVOCC (Non-Vessel Operating Common Carrier, a forwarder without its own vessels), consolidates shipments from multiple customers into a single container, it typically reports the data from its house bills of lading itself.
Assess risk: CBP automatically reviews the data.
Report status back: If there are no objections, the shipment can be loaded. Otherwise, the carrier receives a “Hold” or “Do Not Load” notification: The goods must then remain at the point of origin until the discrepancy is resolved.

Technically, the transmission takes place via EDI (Electronic Data Interchange), i.e., through direct data exchange between systems. Originally, AMS was a standalone system. Today, manifest data is processed via ACE (Automated Commercial Environment), the CBP’s central platform for all trade transactions. In practice, however, the name “AMS” has remained in use for the manifest declaration.

Deadlines by Mode of Transport

How far in advance the data must be submitted depends on the mode of transport. The following deadlines apply to shipments to the U.S.:

Mode of Transport	Deadline for Manifest Data
Maritime Freight (Containers)	24 hours before loading at the foreign port of departure
Ocean freight (bulk cargo, approved general cargo)	24 hours before arrival in the U.S.
Air freight	4 hours before arrival; for short-haul flights from nearby regions, at departure (“wheels up”)
Rail	2 hours before arrival at the U.S. border crossing
Truck	1 hour before arrival at the border; 30 minutes for participants in the FAST program (Free and Secure Trade)

The rule for ocean freight has particularly far-reaching implications. The deadline does not refer to arrival in the U.S., but rather to loading in Europe or Asia. For truck shipments, the procedure is now generally referred to as an e-manifest.

AMS in Practice: What This Means for Warehousing and Shipping

An example: A machinery manufacturer ships spare parts by container via Hamburg to a customer in the U.S. The shipping line must submit the manifest no later than 24 hours before loading in Hamburg. To ensure this, the shipping line and freight forwarder set their own document cutoff time, which is significantly earlier. By that time, the goods description, number of packages, and weights must be finalized—even if the goods have not yet been physically loaded.

This has three implications for intralogistics:

Data quality is crucial: The CBP does not accept imprecise goods descriptions such as “General Merchandise.” Accurate item master data in the ERP and precise packing data from the warehouse management system (WMS) are therefore prerequisites for a shipment to be loaded on time.
Pack Before Declaring: The number of packages and weights listed in the manifest must match the goods actually loaded. Picking and packing must therefore be completed before the document cutoff, not just shortly before pickup.
Interfaces Instead of Manual Data Entry: When shipping data flows automatically from the WMS to the freight forwarder or shipping line, the risk of data entry errors decreases. The article WMS and ERP: Task Distribution and Interaction explains how WMS and ERP systems distribute tasks in this process.

Distinctions: AMS, ISF, ICS2, and ATLAS

There are several electronic reporting procedures related to international cargo traffic that are easily confused:

Procedure	Region	Who reports?	Purpose
AMS / ACE Manifest	U.S.A.	Carrier or NVOCC	Security screening of the cargo prior to arrival or loading
ISF (“10+2”)	U.S., ocean freight only	Importer (Importer Security Filing)	Supplementary security information from the importer, also prior to loading
ICS2 with ENS	EU	Carrier, in some cases also freight forwarders	Entry Summary Declaration prior to arrival in the EU
ATLAS	Germany	Declarant (company or customs service provider)	Customs declaration for import, export, and transit

The European counterpart to AMS is the Import Control System 2 (ICS2). It has been in effect for maritime and inland waterway transport since June 3, 2024, and for road and rail transport since April 1, 2025. As of September 1, 2025, ICS2 is the sole system for this security data. ICS2 also requires precise information: For commercial goods, the six-digit HS code (Harmonized System commodity code) is mandatory, among other things, and overly general terms are expressly excluded as so-called “stop words.”

AMS as an Asset Management System

In maintenance and operations, AMS stands for Asset Management System. This refers to software that companies use to manage their equipment and assets throughout their entire lifecycle—in intralogistics, for example, storage and retrieval machines, conveyor systems, industrial trucks, or vehicle fleets. Typical functions include inventory overview, maintenance planning, fault history, and cost analysis. Closely related is predictive maintenance, which is described in the article Predictive Maintenance in the Warehouse.

Summary

The Automated Manifest System is the electronic process through which carriers report cargo data in advance to U.S. Customs and Border Protection (CBP). For maritime transport, the data must be submitted 24 hours before loading at the port of departure; for air, rail, and road transport, shorter deadlines apply prior to arrival. Technically, AMS is now part of the ACE platform, but the term continues to be used. For warehouses and shipping departments, this means that shipment data must be finalized early, completely, and accurately. Effective integration between the WMS, ERP, and the freight forwarder is therefore more than just a matter of convenience—it determines whether a container reaches its ship.