ISF (Importer Security Filing)
What Is an ISF?
ISF stands for Importer Security Filing. It is a U.S. advance cargo declaration required by Customs and Border Protection for ocean freight destined for the United States.
The filing is often called 10+2. The importer supplies 10 data elements, and the carrier supplies 2. It is a security check before the goods move, not an entry document that clears them on arrival.
How ISF Works
ISF applies to U.S.-bound ocean shipments, not air freight. The key timing is simple: the filing must be made before the container is loaded at the foreign port.
- Importer side the importer or its authorised agent files the 10 data elements, including the seller, buyer, manufacturer and country of origin.
- Carrier side the ocean carrier files the remaining 2 pieces — the vessel stow plan and the container status messages.
- Accuracy risk late, missing or incorrect filings can result in penalties, holds, or additional inspections by CBP.
- Commercial risk even if the cargo eventually clears, a late filing can delay the discharge, devanning or customs release timeline.
The practical takeaway: treat ISF as a pre-shipment task, not a customs clearance step. If the filing is missing when the container is loaded, the problem has already started before the vessel sails.
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