By the Waymore Shipping Operations Team | Last updated: October 2026 | 5 min read

What Are ISF & AMS Filings? Who Files Them?

ISF and AMS are US security declarations filed electronically with US Customs (CBP) before your cargo leaves China. Your forwarder files them — but you supply the data, and mistakes can cost up to $5,000 per violation.

ISF: The Importer's "10+2" Filing

ISF (Importer Security Filing) requires 10 data elements from the importer side plus 2 from the carrier, submitted at least 24 hours before the container is loaded at the origin port. The importer-side elements include: seller, buyer, importer of record number, consignee number, manufacturer, ship-to party, country of origin, HTS code, container stuffing location, and consolidator. The full rule is published by US Customs and Border Protection. Per the official guidance, late or inaccurate ISF exposes the importer to liquidated damages of up to $5,000 per violation.

Who files it?

Legally it's the importer's obligation; practically, your freight forwarder or customs broker files it. You must feed them the factory details, HTS code and stuffing location — the data only you (or your supplier) know. Our China export documentation guide covers what to collect from suppliers: China export customs documents explained.

AMS: The Carrier's Manifest

AMS (Automated Manifest System) is the vessel-level manifest filed by the ocean carrier or NVOCC 24 hours before departure from the last foreign port. As the shipper, you don't file AMS — but your bill of lading data must match it exactly, because mismatches between AMS, ISF and the BL trigger CBP holds. That's why our team cross-checks all three documents before any US-bound sailing.

Common Filing Mistakes to Avoid

1. Missing manufacturer or stuffing location — "unknown" entries are red flags for CBP.
2. Wrong HTS code — it must match what you'll declare at import, not the supplier's guess.
3. Late supplier data — send details before the container is stuffed, not on sailing day; late ISF is the #1 fine trigger we see.

Shipping FBA or retail compliance cargo? Our Amazon FBA shipping playbook folds ISF into the timeline. And for EU-bound cargo, the equivalent security filing is ENS — compared in our AMS vs ENS guide.

Worth remembering: these filings are not bureaucracy for its own sake. CBP screens every manifest before the vessel even departs, and cargo with clean, consistent ISF and AMS data clears the automated risk filters faster. The importers who face the fewest exams are, almost without exception, the ones whose paperwork never contradicts itself.

Your ISF Data Checklist

Collect these from your supplier before the container is stuffed, and filing takes minutes instead of fire drills: full legal name and address of the manufacturer (actual factory, not the trading company unless it manufactures); seller and buyer of record; your importer number (EIN or CBP-assigned); the correct HTS code to six digits; country of origin; the container stuffing location — the factory, warehouse or consolidation hub where the box was sealed; and the consolidator if cargo is LCL. Two of these — stuffing location and consolidator — trip up first-time importers most often, because they assume the forwarder "just knows." The forwarder knows only what you send. When our team receives this sheet with the booking, ISF goes out the same day and the 24-hour deadline becomes a non-event.

Frequently Asked Questions

What is the difference between ISF and AMS?

ISF (Importer Security Filing, or 10+2) is filed by or for the importer 24 hours before the container is loaded at the foreign port. AMS (Automated Manifest System) is the carrier's manifest declaration, filed 24 hours before departure. ISF is cargo-level security data; AMS is the vessel-level manifest.

Who files ISF and AMS for my shipment?

In practice your freight forwarder or customs broker files the ISF on your behalf, while the ocean carrier or NVOCC files AMS. You are responsible for supplying accurate data: supplier details, manufacturer, HTS code, container stuffing location and consolidator.

What is the penalty for late or missing ISF?

US Customs can assess liquidated damages of up to $5,000 per violation, and late or missing ISF can also result in cargo holds and do-not-load instructions. Repeated violations invite shipment-level inspections that add days and storage costs.

Does ISF apply to LCL and air shipments too?

ISF applies to all US-bound ocean cargo, including LCL consolidations — each house bill needs the 10 data elements. Air shipments to the US are covered by separate air security rules rather than ocean ISF, but AMS-style manifest filing still applies to the carrier.