Importer Security Filing (ISF), often called “10+2,” is a U.S. Customs and Border Protection (CBP) requirement that importers electronically submit ten data elements about an ocean shipment at least 24 hours before the cargo is loaded onto a vessel bound for the United States. The ocean carrier supplies two additional data elements — hence “10+2.” Filing late or inaccurately can cost $5,000 per violation, so for any importer bringing containers through PortMiami or Port Everglades, ISF compliance is non-negotiable.
Why ISF exists
ISF was introduced under the SAFE Port Act so CBP can assess security risk before a container is ever loaded overseas. By collecting supply-chain data in advance, customs can flag high-risk shipments and target inspections before goods reach U.S. soil. It applies only to ocean cargo — air, truck, and rail imports are exempt.
The “10” importer data elements
The importer (or its agent) is responsible for filing these ten items:
Required from the importer
Seller, buyer, importer of record number, consignee number, manufacturer or supplier, ship-to party, country of origin, and the commodity HTSUS number. Two more — the container stuffing location and the consolidator — are required but can be updated as the shipment finalizes.
The “2” carrier data elements
The ocean carrier provides the vessel stow plan and container status messages. Together with the importer’s ten elements, these complete the “10+2” picture CBP needs.
ISF timing and penalties
The ISF must be on file no later than 24 hours before the cargo is laden aboard the vessel at the foreign port. Missing the window, filing inaccurate data, or failing to update changes can trigger liquidated damages of up to $5,000 per shipment, plus increased exam rates and cargo holds. A held container also starts the clock on demurrage and detention charges at the terminal — a costly double hit.
How ISF connects to drayage and delivery
A clean ISF keeps your container moving. Once the vessel arrives and customs releases the cargo, your drayage carrier pulls the container from PortMiami or Port Everglades and delivers it. If ISF problems flag the box for exam, the container sits — accruing port fees and idling your supply chain. Coordinating ISF filing, customs clearance, and drayage under one roof prevents these gaps.
Go Freight is an asset-based Miami 3PL with 100+ owned trucks, our own chassis pool, a TSA-approved bonded carrier operation, and AI gate-time prediction at PortMiami and Port Everglades. Because we are asset-based with no double brokering, your container moves the moment it is released. Pair your customs filings with our freight forwarding services for a seamless import.
Frequently asked questions
Who is responsible for filing the ISF?
The importer of record is legally responsible, but most importers authorize a licensed customs broker or freight forwarder to file on their behalf. Responsibility for accuracy still rests with the importer.
Does ISF apply to air freight?
No. ISF (10+2) applies only to ocean cargo arriving by vessel. Air, rail, and truck imports have different advance-data requirements.
What happens if my ISF is late?
CBP can assess liquidated damages up to $5,000, place a hold on the container, and increase your inspection rate. Late or inaccurate filings also delay drayage and add port storage costs.
Clear customs and clear the port faster
Go Freight coordinates ISF, customs clearance, and drayage so your Miami imports never stall. Request a free quote or call (786) 445-0150.