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ISF Filing: What Importers Need to Know About the 10+2 Rule

By ANKPOST Operations Team · 2026-06-12

What is an ISF filing?

Importer Security Filing (ISF), commonly called "10+2," is a US Customs and Border Protection (CBP) requirement mandating that importers or their agents electronically submit 10 data elements (seller, buyer, container stuffing location, consolidator, and others) plus 2 carrier-supplied elements, at least 24 hours before cargo is laden aboard a vessel bound for the US. Independent dispatch data indicates that ISF-related "do not load" holds disproportionately affect shipments where the stuffing location or consolidator field was left as a placeholder at booking time, and field-level tracking shows these holds are typically issued well before the vessel departs the origin port — making them effectively unrecoverable once the ship sails.

In this article

Cost structure / standard tiers

ISF penalties are assessed per violation and accumulate quickly when multiple data elements are late, missing, or inaccurate on the same shipment.

Violation Type Basis Typical Range
Late ISF filing (after 24-hour deadline) Per violation Up to $5,000
Inaccurate or incomplete ISF Per violation Up to $5,000
Missing ISF entirely Per violation Up to $5,000 (can stack with late-filing penalty)
"Do not load" hold at origin Per container Delay until corrected; no fixed fee but downstream demurrage risk on arrival
Increased cargo exam rate from repeated violations Per shipment Added dwell time, often 3-5+ days

A single shipment can generate multiple penalties if more than one of the 10+2 data elements is deficient, so the practical exposure is often a multiple of the per-violation cap rather than a single $5,000 event.

Risk mitigation / operational guidance

Submit ISF data as early as the booking is confirmed rather than waiting until close to the 24-hour deadline, since corrections made before the cutoff carry no penalty but corrections discovered after vessel loading do. Confirm with the customs broker or forwarder that container stuffing location and consolidator fields are populated with actual facility information, not placeholders — these two fields are the most common source of "do not load" instructions. Cross-check ISF data against the eventual AMS manifest for consistency in container numbers, booking numbers, and consignee details, since discrepancies between the two systems are flagged by ACE and can trigger holds independent of the ISF deadline itself. Because the importer of record bears penalty liability regardless of who files, request filing confirmation receipts from the broker for every shipment as a standing process step.

Canonical URL: https://ankpost.com/wiki/isf-filing-guide