For ocean shipments, manifest data is due 24 hours before the cargo is laden aboard the vessel at the foreign port (the 24-hour rule), which puts documentation teams on a hard origin-side clock for final house bill details. The vessel carrier files the manifest; an NVOCC meeting CBP's conditions can transmit its own house-level data directly, while one that does not must disclose the data to the vessel carrier to file, and for those that qualify the choice trades confidentiality and control against software and staffing cost. The AMS filing fee is a carrier service charge rather than a CBP rate, typically $25-$50 per bill of lading with amendments billed at $20 extra. AMS is the carrier-side or NVOCC manifest filing, separate from ISF, the importer's advance security filing (sometimes called ten-plus-two) with its own filer and deadline.
Glossary
AMS (Automated Manifest System)
US Customs and Border Protection's program for advance electronic cargo-manifest filing on US-bound shipments, with ocean filings integrating with CBP's ACE (Automated Commercial Environment) portal.