ISF (Importer Security Filing)

ISF, or Importer Security Filing (commonly called “10+2”), is a U.S. Customs and Border Protection (CBP) requirement that mandates importers submit specific shipment data electronically at least 24 hours before cargo is loaded onto a vessel bound for the United States. The regulation, which took effect in 2009, was designed to give CBP advance visibility into containerized ocean cargo to assess security and compliance risks before goods reach U.S. shores.

The 10+2 Data Elements

The “10+2” name 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.

The importer’s 10 elements are: seller name and address, buyer name and address, importer of record number, consignee number, manufacturer (or supplier) name and address, ship-to party name and address, country of origin, commodity HTS number (at the 6-digit level), container stuffing location, and consolidator name and address.

The carrier’s 2 elements are: vessel stow plan (submitted to CBP within 48 hours of departure) and container status messages (submitted throughout the voyage).

Filing Deadlines

The ISF must be filed no later than 24 hours before the cargo is loaded onto the vessel at the foreign port of departure. For shipments originating in nearby ports (Canada, Mexico, Caribbean), the deadline may be adjusted to the time of sailing or earlier. The filing is made through CBP’s Automated Broker Interface (ABI) system, and most importers delegate this task to their customs broker or freight forwarder.

A critical distinction: the 24-hour rule applies to vessel loading, not vessel departure. If a vessel is scheduled to load containers on Tuesday and depart on Wednesday, the ISF must be filed by Monday (24 hours before Tuesday’s loading). Miscalculating this deadline based on departure rather than loading is a common error.

Penalties for Non-Compliance

CBP can impose penalties of $5,000 per violation for late, inaccurate, or missing ISF filings. In practice, CBP initially focused on education and graduated enforcement, but penalty actions have increased significantly since 2015. Multiple violations can result in increased examination rates, holds on future shipments, and potential liquidated damages claims against the importer’s customs bond.

Beyond penalties, a missing or late ISF can cause the container to be held at the origin port, preventing it from being loaded. This results in the shipment being rolled to the next vessel, adding a week or more to transit time. For FBA sellers managing inventory levels against Amazon’s restock limits, this kind of delay can lead to stockouts and lost sales.

ISF Amendments

ISF data can be amended after the initial filing, and in practice, amendments are common. The HTS code, for example, is required at the 6-digit level at the time of ISF filing, but the full 10-digit classification may not be finalized until the customs entry is prepared. CBP allows amendments to certain fields up until the entry is filed. However, core fields like the seller, buyer, and manufacturer should be accurate at the time of the initial filing.

Practical Tips for FBA Sellers

Provide your customs broker or freight forwarder with complete supplier and shipment information as early as possible, ideally when the booking is confirmed. Many brokers send an ISF questionnaire requesting the 10 data elements. Completing this form promptly prevents last-minute filing that increases the risk of errors.

If you source from multiple factories and consolidate into one container, each factory’s details must be reported on the ISF. The consolidator (often the freight forwarder’s origin agent) and the stuffing location (the warehouse or CFS where the container was loaded) must also be listed. Sellers who use buying agents or trading companies should verify that the actual manufacturer’s details are reported, not just the intermediary’s information.

Keeping ISF filing records organized is important for audit preparation. CBP can request ISF-related documentation during a Focused Assessment or other compliance review, and the importer must demonstrate that filings were timely and accurate.