What ISF Filing Actually Involves
Ten elements, two more from the carrier, and a deadline that falls earlier than most people expect.
Importer Security Filing, commonly called 10+2, is a US Customs and Border Protection requirement for ocean cargo arriving in the United States. The ISF Importer submits ten data elements electronically, and the ocean carrier submits two more, so CBP can assess risk before the cargo is loaded at the foreign port.
It came into force on 26 January 2009 under section 203 of the SAFE Port Act. The name comes simply from the split — ten elements from one party, two from the other.
The concept is straightforward. The execution is where operations get caught out, almost always for the same reason: the deadline is earlier than people assume, and the data required sits with parties who are not the ones filing.
The part people get wrong
The deadline is before loading, not before arrival.
ISF must be filed no later than 24 hours before the cargo is laden aboard the vessel at the foreign port. Not 24 hours before departure. Not 24 hours before arrival in the United States.
That places the deadline weeks before the container reaches a US port, and it means the filing has to be complete while the cargo is still sitting at origin. An operation treating ISF as part of the arrival process has already missed it.
The practical consequence: the data has to be assembled early, from parties at origin — the supplier, the manufacturer, whoever stuffed the container. By the time the vessel sails, it is too late to start asking. Most late filings are not administrative failures; they are information failures that happened days earlier.
Note also that ISF applies to ocean cargo only. Air shipments are not subject to it. Bulk cargo is exempt, and certain breakbulk cargo is exempt or subject to different timing.
The data
What the ten and the two actually are.
- Seller — name and address
- Buyer — name and address
- Importer of record number, or FTZ applicant identification number
- Consignee number or numbers
- Manufacturer, or supplier, name and address
- Ship-to party
- Country of origin
- Commodity HTSUS number, to six digits
- Container stuffing location
- Consolidator — the party who stuffed the container
- Vessel stow plan
- Container status messages
Worth noticing where these elements live. Seller, buyer, manufacturer, country of origin and HTSUS classification come from the commercial side of the transaction — the purchase order and the invoice — rather than the shipping paperwork. That is why ISF frequently stalls waiting on someone in procurement rather than operations.
The bill of lading number matters more than it looks. Without it, CBP cannot match the ISF to the carrier's manifest. For consolidated cargo this means the house bill number reported to AMS — which is one of several reasons HBL and MBL detail has to reconcile before anything is filed.
Responsibility
Someone else can file it. They cannot own it.
The obligation sits with the ISF Importer — generally the owner, purchaser, consignee or agent causing the goods to arrive in the United States. A licensed customs broker or freight forwarder can and usually does file on their behalf.
But responsibility does not transfer with the task. If the filing is late, incomplete or inaccurate, it is the ISF Importer who answers for it — regardless of who pressed the button or which party supplied the data that turned out to be wrong.
Filings are transmitted electronically through the Automated Broker Interface or the Automated Manifest System, and the filer must hold a valid customs bond.
For brokers and forwarders, this shapes how the work should be organised. You are not simply transmitting what you are given — you are the party positioned to notice that an element is missing while there is still time to chase it. That is where the value sits, and where a late filing usually traces back to.
In practice
Where filings actually go wrong.
Rarely through ignorance of the rule. Almost always through one of these:
- Data arrives too late. The supplier at origin has not confirmed the manufacturer address or the stuffing location, and nobody chased until the deadline was close.
- Elements change after filing. The container gets stuffed somewhere else, or the ship-to party changes. The filing needs amending, and often nobody tells the filer.
- HTSUS classification is provisional. A six-digit number filed as a placeholder and never corrected.
- Bill of lading number mismatch. The ISF cannot be matched to the manifest, so it reads as unfiled even though it was submitted.
- Nobody watches the acceptance. Transmission is not acceptance. A filing can be sent and rejected, and if the response is not monitored, the first anyone knows is a hold at arrival.
CBP may assess liquidated damages for late, inaccurate or absent filings, increase inspection rates, and hold cargo at the port. Current penalty and mitigation guidance is published by CBP, and is worth reading directly rather than second-hand.
The indirect cost frequently exceeds the direct one. Examination costs from a hold fall to the importer, and a container sitting under inspection continues to accrue demurrage the whole time. A filing problem that started as a missing address at origin ends as three charges on an invoice nobody expected.
Charges arriving that trace back to a compliance delay?
Send us 100 recent invoices. We check every charge against the booking and the agreed terms, and send you a written report in 5 business days.
Common questions
ISF filing, answered.
What is ISF filing?
Importer Security Filing, commonly called 10+2, is a US Customs and Border Protection requirement for ocean cargo arriving in the United States. The ISF Importer submits ten data elements electronically, and the ocean carrier submits two more, so CBP can assess risk before cargo is loaded at the foreign port.
When is the ISF deadline?
No later than 24 hours before the cargo is laden aboard the vessel at the foreign port. This catches people out because it is before loading, not before departure or arrival — which places the deadline much earlier in the timeline than most expect.
What are the 10+2 data elements?
The importer supplies seller, buyer, importer of record number, consignee number, manufacturer or supplier, ship-to party, country of origin, HTSUS number, container stuffing location and consolidator. The carrier supplies the vessel stow plan and container status messages.
Who is responsible for the ISF filing?
The ISF Importer — generally the owner, purchaser, consignee or agent causing the goods to arrive in the United States. A licensed customs broker or forwarder may file on their behalf, but responsibility for accuracy and timeliness remains with the ISF Importer.
Does ISF apply to air freight?
No. ISF applies to cargo arriving in the United States by vessel. Air shipments are not subject to it, though they have their own advance data requirements.
What happens if an ISF is filed late or incorrectly?
CBP may assess liquidated damages, increase inspection rates, and hold cargo at the port. Examination costs from a hold fall to the importer, and a held container continues to accrue demurrage while it sits, so the indirect cost frequently exceeds the penalty itself.
Related