Importer Security Filing (ISF): What It Is, What to File, and What Happens If You Miss It

What ISF Is and Why It Exists

ISF is a pre-shipment data filing submitted electronically through CBP's Automated Targeting System (ATS). It gives CBP advance notice of who is importing, what they are importing, from whom, and where it was manufactured -- before the container is loaded onto a vessel bound for the US.

The '10+2' name refers to the data elements required: 10 data elements provided by the importer (or their customs broker), and 2 data elements provided by the ocean carrier.

The 10 importer elements are:

• Seller (name and address of the entity selling the goods to the buyer).
• Buyer (name and address of the entity buying the goods -- typically the importer).
• Importer of record number (IRS EIN, Social Security number, or CBP-assigned number of the importer).
• Consignee number (the IRS EIN or CBP number of the party receiving the goods).
• Manufacturer (or supplier) name and address (the factory or supplier providing the goods -- which for China shipments is the Chinese factory).
• Ship-to party (name and address of the first delivery location in the US).
• Country of origin (where the goods were manufactured -- China for most China-origin shipments).
• Commodity HTS code (6-digit minimum at the time of ISF filing; full 10-digit code at entry).
• Container stuffing location (address of the facility where the container was packed).
• Consolidator name and address (the party that stuffed the container -- often the same as the container stuffing location).

The 2 carrier elements (submitted by the ocean carrier, not the importer) are: vessel stow plan and container status messages. Importers do not need to supply these.

When ISF Must Be Filed

ISF must be submitted to CBP no later than 24 hours before the cargo is loaded onto the vessel at the origin port.

This is the cargo load deadline, not the vessel departure time. The difference matters:

• If a vessel departs Shanghai on April 15 and cargo cutoff (the last time containers can be delivered to the terminal) is April 12, and container loading is April 13 to 14, the ISF must be filed by April 12 or 13 at the latest.
• In practice, most customs brokers file ISF 24 to 72 hours before the cargo cutoff date to provide a buffer against last-minute changes.
• For ISF purposes, '24 hours before loading' means 24 hours before the container is physically put on the ship, not 24 hours before the ship sails.

If you do not yet have complete information at filing time (which is common -- final bill of lading numbers may not be confirmed yet), CBP allows a '5+2' reduced data set to be filed initially, with the full 10 data elements updated no later than 24 hours before loading. The window for updates closes when loading begins.

Timing in practice: when you book a shipment with your freight forwarder, provide your customs broker with the ISF data as early as possible -- ideally at the time of booking. Your broker needs: supplier name and address, your company information, HTS code, and the ship-to address.

ISF Penalties

CBP has authority to assess civil penalties for ISF violations under 19 CFR Part 149. The penalty structure:

• Late filing: Up to $5,000 per late ISF. If no ISF is filed at all before the cargo arrives, the maximum penalty per shipment is $5,000.
• Inaccurate or incomplete filing: Up to $5,000 per inaccurate ISF. An ISF that contains wrong information -- incorrect HTS code, wrong manufacturer address, inaccurate country of origin -- is treated as an inaccurate filing.
• Failure to update: ISF data must be updated if information changes between filing and when the cargo is loaded. Failure to update a known error is a separate violation.
• Do Note Stuff hold (DNS): CBP can place a Do Not Stuff order on a container if a compliant ISF is not on file. This prevents the container from being loaded and can delay your shipment by days or force a vessel miss.

In practice, CBP uses a graduated enforcement approach. First-time minor violations typically result in a warning letter rather than maximum penalties. Repeat violations, willful non-compliance, or high-risk cargo attract full enforcement. The practical risk for most importers is the DNS hold -- a missed vessel costs more than the penalty itself in rebooking fees and delay.

Who Is Responsible for Filing ISF

The legal obligation to file ISF rests with the importer of record -- the entity named on the customs entry as the party responsible for the shipment. If you are the importer of record, you are responsible for ISF compliance even if you delegate the filing to your customs broker.

In practice:

• Most importers delegate ISF filing to their licensed customs broker (CHB). The broker files electronically on your behalf through CBP's ACE system.
• Some freight forwarders include ISF filing in their service package. Confirm with your forwarder whether ISF is included or whether you need to arrange it separately with a customs broker.
• Under DDP (Delivered Duty Paid) Incoterms, the supplier is the importer of record and is responsible for ISF. If you are shipping under FOB or DAP terms, you are the importer of record and ISF is your responsibility.

Cost of ISF filing: most customs brokers charge $25 to $75 per ISF filing. Some include it in a bundled entry fee.

ISF for LCL (Less-than-Container-Load) Shipments

ISF is required for both FCL (full container load) and LCL (less-than-container-load) ocean shipments. For LCL, the filing responsibility works slightly differently:

• Each individual importer whose cargo is part of a consolidated LCL shipment must file their own ISF.
• The consolidator (the party combining multiple importers' cargo into one container) provides the container stuffing location and consolidator data elements.
• Your customs broker files ISF for your portion of the LCL shipment just as they would for an FCL shipment.

Air freight, rail, truck, and mail shipments are not subject to ISF requirements. ISF applies only to ocean cargo arriving in the US.