Importer Security Filing (ISF 10+2): What It Is, What to File, and What Happens If You Miss It

What ISF Is and Why It Exists

ISF is a pre-loading data filing submitted electronically to CBP (through ABI, the broker interface to ACE). It tells CBP who is importing, what, from whom, and where it was made, before the container is loaded onto a vessel bound for the US.

The '10+2' name refers to the data: 10 elements provided by the importer (or the broker filing for them), and 2 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 or FTZ applicant ID (IRS EIN, Social Security number, or CBP-assigned number).
• Consignee number (the IRS EIN or CBP number of the party receiving the goods).
• Manufacturer (or supplier) name and address, 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; the full 10-digit code is needed 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 stuffing location).

The 2 carrier elements are the vessel stow plan and container status messages. The ocean carrier files these; importers do not need to supply them.

When ISF Must Be Filed

ISF must be on file no later than 24 hours before the cargo is loaded onto the vessel at the origin port. The clock runs against the loading date in China, not the US arrival date, and that is the single most common way small importers get caught: they treat ISF as an arrival task, but the data has to be ready while the goods are still at the port in China.

It is also the loading time, not the sailing time. The difference matters:

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

Eight of the ten importer elements must be on file 24 hours before loading. The other two, container stuffing location and consolidator, have more flexible timing: they can be supplied later, but no later than 24 hours before the vessel arrives at the US port. Other elements can be amended if details change, and a known error must be corrected.

Timing in practice: when you book the shipment, send your broker the ISF data straight away, ideally at booking. They need the supplier and factory names and addresses, your company details, the HTS code, and the ship-to address.

ISF Penalties

CBP can assess liquidated damages for ISF violations under 19 CFR Part 149. The structure:

• Late filing: up to $5,000 per late ISF. If no ISF is filed at all before the cargo arrives, the exposure is also $5,000 per shipment.
• Inaccurate or incomplete filing: up to $5,000 per inaccurate ISF. A filing with wrong information, such as an incorrect HTS code, a wrong manufacturer address, or an inaccurate country of origin, counts as inaccurate.
• Failure to update: if information changes between filing and loading, the ISF must be updated. Failing to correct a known error is a separate violation.
• Do Not Stuff (DNS) or do-not-load hold: CBP can order that a container not be loaded if a compliant ISF is not on file. That can delay your shipment by days or force it onto a later vessel.

In practice, CBP enforces on a graduated basis: first-time minor violations often get a warning rather than the maximum amount, while repeat violations, willful non-compliance, or high-risk cargo attract full enforcement and more holds and exams. For most small importers the practical risk is the hold: a missed vessel costs more in rebooking and delay than the penalty itself.

Who Is Responsible for Filing ISF

The legal obligation sits with the ISF importer, normally the party that owns or buys the goods and causes them to arrive in the US. For most small importers buying from a Chinese factory, that is the same company that is importer of record on the customs entry. You stay responsible even when you delegate the filing.

• Most importers have a licensed customs broker file the ISF for them electronically.
• Many freight forwarders include ISF filing in their ocean service. Confirm whether it is included or whether you need to arrange it with a broker.
• On a DDP shipment, the party acting as importer of record (the forwarder or its partner, sometimes the supplier) usually handles the ISF with the entry. Ask in writing who files it.
• Under FOB or EXW terms you are normally the importer, so the ISF is yours to arrange.

Cost: most customs brokers charge roughly $25 to $75 per ISF filing, and some include it in a bundled entry fee. The ISF also has to be covered by a customs bond: a continuous bond covers it, otherwise a single-transaction ISF bond is needed.

How a Small Importer Stays Compliant

The data for an ISF comes almost entirely from your supplier and your purchase order, so the fix is to collect it early rather than to rush at the port.

• Collect the 10+2 data with your purchase order, not at the last minute. Most elements come straight from your supplier and the commercial invoice.
• Get your HS code confirmed early. It feeds both the ISF and your customs entry, and an inconsistent code between the two is exactly what flags a filing as inaccurate.
• Have one party file the ISF and the customs entry, so the same accurate data flows through both and nothing falls between two vendors.
• Build the 24-hours-before-loading deadline into your shipping timeline, so a late detail from the supplier does not turn into a penalty.

On our sea service the ISF is handled inside the door to door price: we collect the supplier and HTS details before your goods are loaded in China so the filing goes in on time.

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 works slightly differently:

• Each importer whose cargo is part of a consolidated LCL container needs its own ISF.
• The consolidator (the party combining several importers' cargo into one container) provides the container stuffing location and consolidator data.
• Your 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. They have their own advance data requirements, but ISF applies only to ocean cargo arriving in the US.