By Luis Lopez, AI transportation consultant, CEO of Go Hub.io Holdings Corp and subsidiaries, and host of the Freight Guru Podcast
For ocean imports into the United States, one of the most important filings happens before the container ever leaves the foreign port. The Importer Security Filing, widely known as ISF or “10+2,” gives U.S. Customs and Border Protection advance information about the cargo so it can assess risk before the vessel sails.
Importers who treat ISF as an afterthought tend to learn about it the hard way: holds, exams, and delays at the U.S. port. This article covers who files, what goes into the filing in general terms, when it is due, the role of the customs broker, and the data mistakes that cause the most trouble.
What ISF 10+2 Is
ISF is an electronic filing required for most ocean cargo arriving in the United States. The name “10+2” describes its two halves:
- The “10”: data elements the importer side is responsible for providing.
- The “+2”: data elements the ocean carrier provides about the vessel and the containers.
The purpose is security screening. By collecting information about who sold the goods, who bought them, where they were made, and where the container was packed, customs can identify shipments that need a closer look before they arrive.
ISF applies to ocean shipments only. Air cargo, truck crossings, and rail crossings have their own advance data programs, but ISF itself is an ocean requirement.
Who Files the ISF
Responsibility sits with the “ISF importer,” which is generally the party that causes the goods to arrive in the United States. In practice this is often the buyer or owner of the goods, or the importer of record.
Most importers do not transmit the filing themselves. They authorize a licensed customs broker or another qualified agent to file on their behalf through the customs electronic system. That delegation does not shift the legal responsibility: if the filing is late or wrong, the ISF importer is still the one accountable.
This matters when sales terms place the shipping arrangement with the overseas seller. Even when the seller books the freight, the U.S. importer usually still needs to make sure the ISF is filed. Understanding how Incoterms divide responsibilities helps clarify who is collecting which information, but it does not remove the importer’s ISF obligation.
The Data Elements in General Terms
The importer side of the filing covers parties, product, and packing location. In general terms, it includes:
- Seller and buyer of the goods.
- Importer of record and consignee identification numbers.
- Manufacturer or supplier of the goods.
- Ship-to party, meaning where the goods will actually be delivered in the United States.
- Country of origin of the goods.
- Tariff classification at the commodity heading level.
- Container stuffing location where the container was packed.
- Consolidator or stuffer who packed the container.
The carrier side covers the vessel stow plan and container status messages, which the importer does not need to provide.
Some elements are known early, such as the buyer and seller. Others, especially the stuffing location and consolidator, may not be confirmed until close to loading. The rules allow certain information to be filed on a best-available basis and updated as details firm up, but the filing must be accurate and complete by the applicable deadlines.
Timing: Before Loading at the Foreign Port
The core timing rule is simple: the ISF must be filed at least 24 hours before the cargo is loaded onto the vessel at the foreign port. Not before departure, not before arrival, but before loading.
That deadline is earlier than many new importers expect. Because loading often happens days before the vessel sails, and the vessel may sail weeks before it arrives, the importer needs supplier and shipping information well ahead of the time most people think about customs.
Practically, this means the importer and broker should collect ISF data when the order is booked, not when the booking confirmation shows a vessel date.
The Customs Broker’s Role
A customs broker typically handles more than just pushing the filing through the system. A good broker will:
- Request the data from the importer, supplier, and freight forwarder.
- Check it for consistency against commercial documents like the invoice and packing list.
- Transmit the filing and confirm it was accepted.
- Match the ISF to the bill of lading so customs can link the filing to the actual shipment.
- Update the filing when details change before arrival.
The ISF also connects to the rest of the import process. The same parties and classifications show up again at entry. Tools built for AI-assisted customs classification and entry prep can help keep the data consistent across both filings, but a licensed broker still reviews and stands behind the work.
Common ISF Data Mistakes
Most ISF problems come from data quality, not from bad intent. The recurring ones include:
- Using the trading company as the manufacturer. The manufacturer should be the party that actually made or assembled the goods, not just the exporter on the invoice.
- Wrong ship-to address. The ship-to party should be where the goods are going first in the United States, such as a warehouse or distribution center, not the importer’s head office.
- Vague stuffing location. A general city name is not enough. The filing needs the actual location where the container was packed.
- Bill of lading mismatch. If the bill of lading number on the ISF does not match the carrier’s records, the filing may not link to the shipment, and customs may treat it as missing.
- Late updates. Information filed as best available and never updated can leave the record incomplete.
- Classification drift. A tariff heading on the ISF that conflicts with the one used at entry invites questions.
An ISF problem can lead to holds or exams at the U.S. port, which turn into storage, demurrage, and missed delivery dates. Those delays ripple into every step of the import container move, from pickup appointment to final delivery.
Where AI Fits
ISF data is a good match for automation because most of it already exists in purchase orders, commercial invoices, packing lists, and booking confirmations. As an AI transportation consultant, I see the most value in tools that do three things:
- Extract parties, origins, and addresses from supplier documents.
- Compare the extracted data against prior shipments from the same supplier and flag differences.
- Track deadlines by watching booking and loading dates and alerting the team before the filing window closes.
The limit is that a model can confidently extract the wrong manufacturer or misread an address. Every AI-assisted ISF should be reviewed by the broker before transmission, and the importer should keep supplier master data clean so the automation has something reliable to learn from.
Practical Checklist
- Collect ISF data at purchase order, not at sailing.
- Require suppliers to identify the true manufacturer and the actual stuffing location.
- Confirm the bill of lading number with the forwarder or carrier.
- Have your broker confirm acceptance and match status for every filing.
- Keep ISF and entry data consistent.
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About the author: Luis Lopez is a Miami-based AI transportation consultant and logistics entrepreneur, the CEO of Go Hub.io Holdings Corp and subsidiaries, and host of the Freight Guru Podcast.