ISF 10+2 Filing: Complete Guide for US Importers

What Is the Importer Security Filing (ISF)?

The Importer Security Filing, commonly known as ISF or the 10+2 rule, is a US Customs and Border Protection requirement that applies to all ocean cargo destined for the United States. Introduced under the SAFE Port Act of 2006 and enforced since January 2010, the ISF requires importers to electronically submit specific data elements about their inbound shipments to CBP before the cargo is loaded onto a vessel bound for a US port. The purpose is to give CBP advance intelligence to assess security risks and target high-risk shipments for inspection before they arrive on US soil.

The ISF applies only to ocean shipments — air freight, trucking, and rail are not subject to this requirement. However, virtually every importer who receives containerized goods from overseas must comply, regardless of shipment value or commodity type. There are no de minimis exemptions for ISF: even low-value shipments under $800 that qualify for Section 321 duty-free entry still require an ISF filing.

The 10+2 Data Elements Explained

The name '10+2' refers to the number of data elements required. The importer (or their agent) must provide 10 data elements, and the ocean carrier must provide 2 additional elements. Understanding each element is critical because inaccurate data triggers the same penalties as late filing.

The 10 Importer Data Elements

1. Manufacturer (or supplier) name and address: The entity that last manufactured, assembled, or produced the goods. This is not the seller — it is the factory or production facility.
2. Seller name and address: The party who sold the goods for export to the United States. This may be the manufacturer, a trading company, or an intermediary.
3. Buyer name and address: The party who purchased the goods. Usually the US importer of record or their parent company.
4. Ship-to name and address: The physical location in the US where the goods will be delivered. For goods going to a warehouse, this is the warehouse address, not the ultimate consignee.
5. Container stuffing location: The physical address where the goods were loaded into the ocean container. For LCL (less than container load) shipments, this is the CFS (container freight station).
6. Consolidator name and address: The party who arranged for the goods to be stuffed into the container. For FCL shipments where the shipper stuffs the container, this is often the same as the manufacturer.
7. Importer of record number: Your IRS tax ID (EIN), CBP-assigned number, or Social Security Number used for customs purposes.
8. Consignee number: The IRS EIN of the party who will receive the goods in the US. Often the same as the importer of record.
9. Country of origin: The country where the goods were manufactured or where they underwent substantial transformation. This must match what you declare on your customs entry.
10. HTS number (6-digit): The Harmonized Tariff Schedule code at the 6-digit level. You do not need the full 10-digit code for ISF purposes, but the 6-digit code must accurately describe the goods.

The 2 Carrier Data Elements

1. Vessel stow plan: A detailed plan showing where each container is physically located on the vessel. Submitted by the carrier to CBP.
2. Container status messages: Electronic updates on container movements (gate-in, gate-out, loaded, discharged). Submitted by the carrier throughout the voyage.

Filing Deadlines: The 24-Hour Rule

The ISF must be filed no later than 24 hours before the cargo is loaded onto the vessel at the foreign port of origin. This is not 24 hours before the vessel departs or 24 hours before arrival — it is 24 hours before loading. In practice, this means you need your ISF data ready well before the vessel's cargo cutoff date. For transshipment cargo, the deadline is 24 hours before loading at the first foreign port.

CBP allows amendments to ISF filings after the initial submission, which is important because some data elements may not be finalized at the time of filing. The HTS code, for example, can be updated up to 24 hours before the vessel arrives at the first US port. However, the core data elements — manufacturer, seller, buyer, ship-to — must be accurate at the time of initial filing. Filing with placeholder data or obviously inaccurate information does not satisfy the requirement.

Penalties for Late or Inaccurate ISF Filing

CBP takes ISF compliance seriously, and the penalties reflect this. The statutory penalty for failing to file, filing late, or filing inaccurate ISF data is $5,000 per violation. Each shipment with a missing or deficient ISF constitutes a separate violation. For importers with multiple ocean shipments per month, penalties can accumulate rapidly.

• Late filing: $5,000 penalty per shipment. CBP has discretion to increase penalties for repeat offenders.
• Inaccurate data: $5,000 penalty per shipment for data elements that are materially inaccurate.
• No filing: $5,000 penalty per shipment, plus CBP may hold the cargo at the port for inspection, issue a do-not-load order to the carrier, or refuse entry entirely.
• Liquidated damages: In addition to ISF penalties, CBP may pursue liquidated damages against the importer's customs bond for ISF violations, typically in the amount of the bond.

Who Is Responsible for ISF Filing?

The legal responsibility for ISF filing falls on the importer of record. However, most importers delegate the actual filing to their customs broker or freight forwarder, who submits the ISF through CBP's Automated Broker Interface (ABI) system. Even when you delegate filing, you remain legally responsible for the accuracy and timeliness of the data. This means you must provide your broker with accurate, complete information well before the filing deadline.

For importers who use a Non-Vessel Operating Common Carrier (NVOCC) or freight forwarder, the filing chain can involve multiple parties. Your NVOCC may file the ISF on your behalf, or they may expect you or your customs broker to handle it. Clarify ISF filing responsibility in writing with every supply chain partner to avoid gaps — CBP does not accept 'my broker was supposed to file it' as a defense.

Bond Requirements for ISF

To file an ISF, you must have a customs bond in place. A single entry bond covers one shipment; a continuous bond covers all shipments for a 12-month period. If you already have a continuous bond for your import operations, it covers ISF filing as well. If your ISF filings consistently result in penalties, CBP may require an increase to your bond amount through a bond sufficiency review.

Common ISF Errors and How to Avoid Them

• Wrong manufacturer address: Listing the trading company instead of the actual factory. Always use the production facility address.
• Incorrect ship-to address: Using the buyer's office address instead of the physical delivery location (warehouse, distribution center).
• Missing container stuffing location: This is frequently unknown to the importer. Work with your supplier to obtain the CFS or factory loading address.
• Wrong HTS code: The 6-digit code must accurately describe the goods. Using a generic or incorrect code triggers penalties even though the full 10-digit code is not required.
• Late filing due to poor communication: Establish a standing procedure with your supplier and freight forwarder to transmit ISF data at least 5 business days before estimated vessel loading.

Automating ISF Filing

Manual ISF filing is error-prone and time-consuming, especially for importers with high shipment volumes. Modern trade compliance platforms integrate with your supply chain data to pre-populate ISF data elements from purchase orders, supplier databases, and previous filings. Automated ISF systems can validate data before submission, flag missing elements, and transmit the filing to CBP through ABI with minimal human intervention. Platforms like Camtom connect your supply chain data directly to the ISF workflow, reducing filing errors and ensuring you never miss a deadline.

“The ISF is not just a filing — it is the first impression your shipment makes on CBP. Getting it right sets the tone for the entire import process.”

— Camtom Team