On a U.S. ocean import, one of the first hard deadlines arrives before the cargo leaves the foreign port. For most non-bulk cargo, the first eight Importer Security Filing (ISF or "10+2") data elements are due at least 24 hours before lading. The information often comes from sellers, suppliers, and origin agents working across time zones.
This guide covers what ISF is, the ten data elements, when each is due, who files it, how updates work, what happens when a filing is late or wrong, and a checklist forwarders use to stay ahead of it.
When is an ISF due?
Direct answer: For most non-bulk ocean cargo entering the United States, the ISF importer or authorized agent files eight data elements at least 24 hours before foreign-port lading. The stuffing location and consolidator are due as early as possible, but no later than 24 hours before U.S. arrival, subject to short-voyage rules.
CBP's "10+2" rule took effect in 2009, with general compliance required beginning in 2010. Current requirements appear in 19 CFR Part 149 and CBP's current ISF guidance.
What does "10+2" mean?
The name describes who provides what:
- "10" is the ten data elements the ISF importer provides.
- "+2" is the two additional data sets the ocean carrier provides: the vessel stow plan and container status messages.
For a forwarder or customs broker acting as the importer's authorized agent, the "10" is where most of the coordination and filing work sits.
What are the ten ISF data elements?
Under 19 CFR §149.3, a standard ISF-10 is filed at the lowest bill of lading level, such as the house bill when applicable. The commodity must be identified to at least the six-digit HTSUS level, and the manufacturer or supplier, country of origin and HTSUS number must be linked at the line-item level.
| # | Data element | Due |
| 1 | Seller | 24 hours before loading at the foreign port |
| 2 | Buyer | 24 hours before loading |
| 3 | Importer of record number | 24 hours before loading |
| 4 | Consignee number(s) | 24 hours before loading |
| 5 | Manufacturer (or supplier) | Initial filing 24 hours before loading; update by 24 hours before U.S. arrival if using the flexible rule |
| 6 | Ship-to party | Initial filing 24 hours before loading; update by 24 hours before U.S. arrival if using the flexible rule |
| 7 | Country of origin | Initial filing 24 hours before loading; update by 24 hours before U.S. arrival if using the flexible rule |
| 8 | Commodity HTSUS number (at least 6 digits) | Initial filing 24 hours before loading; update by 24 hours before U.S. arrival if using the flexible rule |
| 9 | Container stuffing location | As early as possible; no later than 24 hours before U.S. arrival (upon lading for a voyage under 24 hours) |
| 10 | Consolidator (stuffer) | As early as possible; no later than 24 hours before U.S. arrival (upon lading for a voyage under 24 hours) |
The manufacturer or supplier, country of origin and HTSUS number must be linked at the line-item level. Bulk cargo is exempt from ISF only when it also qualifies for the advance cargo-declaration exemption under 19 CFR §4.7(b)(2). Qualifying break-bulk cargo must still be filed, but the deadline may move to 24 hours before U.S. arrival. FROB, IE and T&E cargo use a separate five-element filing.
Who is responsible for filing the ISF?
The regulation defines the "ISF importer" as the party causing goods to arrive by vessel. For standard imports, that may be the owner, purchaser, consignee or an agent such as a licensed customs broker. Different definitions apply to FROB, IE, T&E and FTZ cargo.
The ISF importer may authorize an agent to transmit through a CBP-approved electronic interchange system. The filer must meet CBP's electronic communication requirements, the ISF importer or agent must provide an appropriate bond, and an authorized agent must retain a power of attorney in English. Using an agent does not automatically change who is responsible for the accuracy and timeliness of the filing.
Can an ISF be updated after it is filed?
Yes, and in some cases it must be. Under 19 CFR §149.2:
- Updates. If any information changes, or more accurate information becomes available, before the goods reach a US port, the filer must update the ISF.
- Flexible elements. For manufacturer or supplier, ship-to party, country of origin, and HTSUS number, the filer may transmit the best available data by the pre-lading deadline, then update it as soon as better data is known and no later than 24 hours before U.S. arrival. For voyages under 24 hours, the update is due upon lading.
- Withdrawal. If the goods are no longer going to be imported into the US, the filing must be withdrawn with a reason.
What happens if an ISF is late or wrong?
CBP may issue a liquidated-damages claim of $5,000 per violation for an inaccurate, incomplete, or untimely ISF under the applicable bond conditions. That is a bond claim, not an automatically assessed flat fine in every case. CBP also warns that noncompliance can lead to increased inspections and cargo delays.
Beyond the bond claim, a problem filing can mean holds, examinations, or slower release. Those delays can consume terminal free time after arrival and may contribute to later storage or demurrage costs.
Why do ISF filings go wrong?
The most common causes are coordination problems, not complicated rules:
- the seller or supplier has not shared manufacturer or origin details,
- the HTSUS classification is missing or not agreed,
- the origin agent sends booking details late, or changes them after filing,
- the stuffing location and consolidator are not confirmed before the container sails,
- nobody owns the update when the booking, supplier or cargo changes.
What checklist helps forwarders avoid ISF problems?
- Collect ISF data at booking, not after the cargo is ready. Build it into the booking request to the origin agent.
- Confirm the loading date with the origin agent and file well before the 24-hour cutoff, not on it.
- Check the ten elements against the commercial documents once they arrive, and look for mismatches in parties, origin or classification.
- Chase the stuffing location and consolidator as soon as the container is stuffed.
- Update the filing whenever the booking, supplier, cargo or parties change before arrival.
- Record who filed and when on the shipment file, so problems at arrival can be traced quickly.
How can automation help with ISF?
Most ISF work happens before transmission: collecting, checking and reconciling data from booking confirmations, commercial invoices, packing lists, pre-alerts and other shipment records. An AI teammate can extract the ten elements, compare party and line-item details, flag missing or conflicting information and keep the deadline visible. With the required filing setup, the same workflow can then transmit the ISF. The ISF importer remains responsible for compliance, while authorized users decide how to resolve uncertain data and classification issues.
Where NavLogic fits
NavLogic is the AI teammate built for freight operations. It reads operational emails and documents such as pre-alerts, invoices and packing lists, connects the information to the right shipment and flags missing or conflicting ISF data with the source documents attached. Your team can review the filing and send the ISF directly from NavLogic, whether NavLogic is the core operating workspace or works alongside an existing FMS. NavLogic does not change who the ISF importer is or remove any required authorization, bond or filing setup.
Frequently asked questions
What is ISF filing?
ISF is the electronic Importer Security Filing CBP requires for most non-bulk cargo arriving in the United States by ocean vessel. Standard U.S.-bound shipments generally require ten importer data elements; FROB, IE, and T&E cargo uses a separate five-element filing.
How many hours before loading must an ISF be filed?
Eight importer data elements are generally due at least 24 hours before foreign-port lading. The stuffing location and consolidator are due as early as possible and no later than 24 hours before U.S. arrival; for voyages under 24 hours, they are due upon lading.
What is the penalty for a late ISF?
CBP may issue a $5,000 liquidated-damages claim per violation for an inaccurate, incomplete, or untimely ISF under the applicable bond. Noncompliance can also lead to inspections or cargo delays.
Who files the ISF, the importer or the forwarder?
The ISF importer is responsible. For standard imports, that may be the owner, purchaser, consignee or an agent such as a licensed customs broker. A forwarder, broker or other authorized agent may transmit the filing when the authorization, bond and electronic filing requirements are met, but using an agent does not automatically shift the importer's obligations.
What does the "+2" in ISF 10+2 mean?
The "+2" refers to two data sets the ocean carrier provides to CBP: the vessel stow plan and container status messages. The importer side provides the ten data elements.
Can you change an ISF after filing?
Yes. The filer must update the ISF if information changes or more accurate information becomes available before the goods reach a US port, and must withdraw it if the goods will no longer be imported.
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