Importer Security Filing: who files it, what is in it, when it is due
Ten elements, three parties and two clocks that are not the same clock. Who owes the filing, what goes in it, and what happens on a lane too short for the 24-hour deadline to exist.
An Importer Security Filing is an advance electronic declaration of ten data elements that the ISF Importer, or an authorised agent, must transmit to US Customs and Border Protection for cargo arriving in the United States by vessel. Eight of the ten elements are due no later than 24 hours before the cargo is laden aboard the ship at the foreign port; the container stuffing location and the consolidator are due no later than 24 hours before arrival in a US port — or upon lading, where the foreign port is less than a 24-hour voyage from the nearest US port (19 CFR 149.2(b)). The filing must be secured by a bond.
ISF is not the manifest, and it is not the entry
Three separate transmissions cover the same container, and they belong to three different parties. The Importer Security Filing is the importer's, under 19 CFR part 149. The cargo declaration — what the trade still calls AMS — is the carrier's, under 19 CFR 4.7, running on the same 24-hour clock. The entry is the broker's, under 19 CFR part 142, on arrival. A container can be perfectly manifested and still be un-filed for ISF purposes.
The "+2" in "10+2" is not two extra importer elements. It is two carrier obligations: the vessel stow plan, due no later than 48 hours after the vessel departs the last foreign port, or before arrival on voyages shorter than 48 hours (19 CFR 4.7c), and container status messages, due no later than 24 hours after the message is entered into the carrier's equipment tracking system (19 CFR 4.7d).
ISF-10 and ISF-5
Which filing you owe depends on what the cargo is doing.
| Filing | Applies to | Elements | Due |
|---|---|---|---|
| ISF-10 | Cargo destined to the United States | Seller; buyer; importer of record number or FTZ applicant ID; consignee number(s); manufacturer or supplier; ship-to party; country of origin; commodity HTSUS number; container stuffing location; consolidator (stuffer) | First eight elements 24 hours before lading; stuffing location and consolidator no later than 24 hours before arrival in a US port, or upon lading where the foreign port is less than a 24-hour voyage away (19 CFR 149.2(b)) |
| ISF-5 | Freight remaining on board (FROB), and in-bond immediate exportation (IE) or transportation and exportation (T&E) | Booking party; foreign port of unlading; place of delivery; ship-to party; commodity HTSUS number | FROB: before lading. IE and T&E: 24 hours before lading |
Bulk cargo is exempt from the filing requirement altogether. Break bulk importers holding an exemption still present the filing, but 24 hours before the cargo arrives in the United States rather than before lading (19 CFR 149.4).
The sequence, and the deadlines that bite
- Fix who the ISF Importer is before the booking is confirmed. For goods destined to the US it is the owner, purchaser, consignee or agent; for FROB it is the carrier. An authorised agent may transmit, but the obligation stays with the ISF Importer.
- Confirm the bond. The ISF Importer must hold a basic importation and entry bond, a custodial bond, an international carrier bond, an FTZ operator bond, or a standalone importer security filing bond under Appendix D to part 113. Where it holds none of these, an authorised agent may file on the agent's own bond (19 CFR 149.5).
- Get the parties right. Seller and buyer are the last known entities by whom and to whom the goods are sold — not, by default, the shipper and consignee printed on the bill of lading. Ship-to party is the first deliver-to party physically scheduled to receive the goods.
- Transmit 24 hours before lading, in English, through a CBP-approved electronic system (19 CFR 149.2). The clock runs to lading at the foreign port — not to sailing, and not to the documentation cut-off your carrier published.
- Add stuffing location and consolidator once the container is stuffed, and in no event later than 24 hours before arrival in a US port — or upon lading, where the foreign port is less than a 24-hour voyage from the closest US port (19 CFR 149.2(b)). On Caribbean, Mexican and Canadian coastal services the whole voyage is often under 24 hours, so that deadline collapses to lading.
- Keep updating it, and withdraw it if the cargo does not go. If submitted information changes, or better information becomes available, before the goods enter the limits of a US port, the filer must update it. Where the goods are no longer intended for the United States, the filer must withdraw the ISF and transmit the reason (19 CFR 149.2).
What goes wrong
- The 24 hours is measured from the wrong event. Operators diary the sailing date. The regulation measures lading. On a port-hopping service the box can be loaded days before the vessel leaves the last foreign port, and the deadline passes while the file still looks comfortable.
- The rolled booking. The container misses the vessel and nobody amends the filing, which now describes a voyage that will not happen. The update and withdrawal duties run until the goods enter the limits of a US port.
- Seller and buyer copied off the bill of lading. Where a trading house sits between the factory and the importer, the last known seller is not the shipper on the B/L. An inaccurate filing is a breach in the same way a late one is.
- Nobody owns the last two elements. Stuffing location and consolidator come from the origin agent, after the first eight have gone. With no one watching for them the filing stays incomplete right up to arrival.
- Two filings, one shipment. The customer's broker files and the forwarder files as well, and CBP receives duplicates against the same bill of lading.
How software handles it
Most of the ISF is data the forwarder already holds — parties, commodity, container, bill of lading — sitting in a booking rather than in a filing screen. What a system is good for is keeping those fields on the shipment and surfacing the missing ones before the lading date arrives. Linbis prepares and validates AMS and ISF data on the shipment and hands it off for transmission, so the security-filing fields live on the file and are checked before they are needed; that sits inside ocean shipment handling for forwarders and NVOCCs, with bills and manifests produced from the same record through document generation.
Questions operators ask
Does ISF apply to air freight?
No. Part 149 covers cargo arriving in the United States by vessel. Air cargo has its own advance data regime — the inward manifest under 19 CFR 122.48a and Air Cargo Advance Screening under 122.48b — and the two are not interchangeable.
Who is responsible if my agent files it?
The ISF Importer. An authorised agent may transmit, and may do so on its own bond where the importer has none, but the filing obligation and the bond exposure remain the importer's.
What happens if the ISF is late?
The bond is exposed to liquidated damages of $5,000 for each violation (19 CFR 113.62(j), and Appendix D to part 113 for the standalone ISF bond). CBP also describes non-compliance as risking monetary penalties, increased inspections and delay of cargo. The cost side of ISF — filing charge, bond and penalty is worth separating out before you argue about who pays.
Can the ISF be filed together with the entry?
Yes. Where both go in the same electronic transmission, four fields — importer of record number, consignee number, country of origin, and the commodity HTSUS number where it is given at the 10-digit level — are provided once (19 CFR 149.6). The ISF itself needs only six digits, so that last saving is conditional. A filing that is to be used for entry must come from an importer filing for itself or a licensed customs broker (19 CFR 143.1).
How does ISF relate to the carrier's AMS filing?
They are separate obligations that happen to share a 24-hour clock, and CBP associates them through the bill of lading. Getting one right does not cover the other: see the AMS cargo declaration and the 24-hour rule.
We only do a handful of US imports — is a system worth it for that?
The exposure does not scale with volume. One inaccurate filing carries the same $5,000 liquidated damages claim whether it is your fifth container of the year or your five-hundredth, and it is the low-volume forwarder who is most likely to be diarising lading dates in a spreadsheet. Linbis starts at $150 per month including one user, with a free trial and no credit card.