ISF (10+2) filing

The Importer Security Filing, universally called 10+2, is a security transmission required under 19 CFR part 149 for cargo arriving in the United States by vessel. It is not part of your customs entry. It goes in earlier, it is scored separately, and CBP can penalise it even on a shipment that clears without any other problem. Air, truck and rail cargo are outside it entirely, though each of those modes has its own advance data rule.

Two filings, and only one is yours

ISF-10 covers cargo that will be entered for consumption or admitted to a foreign trade zone. It is filed by the ISF importer, defined as the owner, purchaser, consignee or their agent. In practice that agent is your broker.

ISF-5 is the shorter filing for freight remaining on board and for cargo moving under immediate exportation or transportation and exportation. It carries five elements and is filed by the carrier or booking party.

The "+2" belongs to the carrier, not to you: the vessel stow plan and the container status messages. Importers sometimes ask us to file those. Nobody can, on their behalf.

The ten elements

1. Seller (name and address)
2. Buyer (name and address)
3. Importer of record number
4. Consignee number
5. Manufacturer or supplier
6. Ship to party
7. Country of origin
8. HTSUS number, six digits minimum
9. Container stuffing location
10. Consolidator (stuffer)

Two clocks, not one

This is the part that gets misread most often. There are two separate deadlines inside a single ISF.

• Elements 1 to 8: no later than 24 hours before the cargo is laden aboard the vessel at the foreign port. Not 24 hours before it arrives here. If your supplier sends documents on the day the box is loaded, the filing is already late and no amount of speed on our side fixes that.
• Elements 9 and 10, the container stuffing location and the consolidator: as early as reasonably possible, and no later than 24 hours before the vessel arrives at the first US port.
• Four flexible responses. The manufacturer, ship to party, country of origin and HTSUS number may be filed initially as a good faith range or best estimate, then updated. The update is also due no later than 24 hours before arrival. Flexibility is permission to file early with imperfect data, not permission to leave it wrong.
• Break bulk. For carriers approved for the break bulk exemption the filing is due 24 hours before arrival rather than before lading.

The practical reading of all this: file at booking. The lading deadline is the only one you cannot recover from, and booking is the first moment you have enough information to file.

Where ISFs actually fail

Almost nobody simply forgets to file. The failures we see are quieter than that.

• The bill of lading does not match. An ISF has to match the lowest level bill on file in the carrier manifest system. If the NVOCC files the house bill after your ISF went in, or a digit was re-keyed, or the booking switched from a master to a house bill, you have an unmatched ISF. CBP treats an unmatched filing as no filing, and nothing in the process tells you clearly that it happened. Someone has to go and look.
• The booking was cancelled and the ISF was left standing. Failure to withdraw is its own violation.
• Ranges were never narrowed. The initial estimate went in, the vessel sailed, nobody came back to it.
• A stale stuffing location on a repeat order.The template carried last quarter's consolidator forward. The factory changed warehouses in between.
• The wrong importer of record number, which happens routinely when the buying entity and the importing entity are not the same company.

What non-compliance costs

CBP assesses $5,000 in liquidated damages per violation, and its guidance caps a single ISF transaction at $10,000. Late filing, inaccurate data, incomplete data, failure to withdraw and failure to match are separate violations, which is how one container reaches the cap. Petitions for relief go in under 19 CFR part 172 and mitigation is discretionary. Your prior violation history is the main thing that moves it.

The penalty is rarely the expensive part. The operational consequences arrive first: a manifest hold that stops the entry from being filed at all, and, at the extreme, a do not load message issued to the carrier at the origin port under the 24-hour rule. That leaves your cargo sitting in Ningbo or Rotterdam while the vessel sails without it.

The ISF also has to be secured. A continuous customs bond covers it; without one you need a standalone ISF bond before the filing can be transmitted. The bond guide covers how that is sized.

What filing early costs you

Nothing. There is no premium for transmitting at booking rather than at cut-off, and no penalty for amending a filing that was submitted in good faith and then refined. Filing early eliminates the entire class of late-filing violations and leaves time to catch the bill mismatch while it is still fixable. We file on receipt of documents, not on the deadline, for exactly that reason.