ISF stands for Importer Security Filing. It is a US Customs and Border Protection requirement. The importer has to submit ten pieces of information about a shipment before that cargo is loaded onto a vessel heading to the United States. Cargo that loads without a valid ISF is a problem at the other end, not at this one.
It is also called 10+2, because there are ten data elements from the importer and two from the carrier.
Why ISF Exists
Before ISF, CBP only saw a shipment when the vessel was already at sea. That gave the agency roughly two weeks to decide whether a container was a risk, and no chance to stop it loading.
ISF moved part of that decision earlier. If CBP wants to look at a container, it now has the information while the box is still in China. It can order a hold before the vessel sails.
The practical consequence for importers is simple: ISF is not a document you prepare at destination. It is prepared before loading, which means before you can see whether anything went wrong.
The Ten Data Elements
| # | Element | Notes |
|---|---|---|
| 1 | Manufacturer name and address | Must be the factory, not the trading company |
| 2 | Seller name and address | |
| 3 | Buyer name and address | |
| 4 | Ship-to name and address | Where the goods actually go |
| 5 | Container stuffing location | Where the box was loaded |
| 6 | Consolidator name and address | |
| 7 | Importer of record number | EIN or CBP-assigned number |
| 8 | Consignee number | |
| 9 | Country of origin | |
| 10 | HTS code at six digits | Classification drives this |
The two carrier elements are the vessel stow plan and the container status messages.
Who Files It, and When
The importer of record files it, in practice through a customs broker or the forwarder acting on the importer’s behalf.
The deadline is the part that catches people. ISF must be filed at least 24 hours before the cargo is loaded onto the vessel. Not 24 hours before arrival. Not 24 hours before departure. Before loading, which for a Chinese port means the cut-off is set by the terminal, not by the sailing schedule.
A shipment booked late can therefore be in a position where the container is at the terminal gate and there is no longer enough time to file cleanly.
What Happens When It’s Wrong
Three outcomes, in increasing order of cost:
CBP holds the container. A hold placed on an ISF issue is served before loading. The box does not sail. It waits for the next vessel, which in a peak season can be a week or more.
Penalties. ISF violations are commonly assessed at up to USD 5,000 per violation. Liquidated damages can follow in more serious cases.
Nothing happens, and you don’t notice. This is the most expensive outcome over time. A filing that passes with wrong data does not announce itself. It becomes a problem when the same buyer or the same HTS code gets flagged later.
The elements most often wrong are the first and the fifth: manufacturer and stuffing location. Trading companies routinely put their own address in the manufacturer field. That is a data error even when the goods are fine.
ISF vs AMS
Both are filings. They are not the same, and they are not interchangeable.
| ISF (10+2) | AMS | |
|---|---|---|
| Who files | Importer, via broker or forwarder | Carrier, and NVOCC for house bills |
| What it covers | The shipment’s parties, origin, classification | The bill of lading |
| Deadline | 24 hours before loading | 24 hours before loading, for the manifest |
In practice AMS is the carrier’s obligation and ISF is yours. If your forwarder files both, confirm it in writing. A freight quote that says “customs included” does not necessarily mean “ISF filed on time”.
Five Things Importers Get Wrong
- Treating ISF as a destination task. It is a pre-loading task.
- Putting the trading company as manufacturer. The factory address is what CBP wants.
- Using the consignee address as ship-to. They are often different, and for Amazon FBA they are almost always different.
- Filing ISF with a placeholder HTS code. Six digits are required, and they need to be plausible.
- Assuming the forwarder did it. Ask for the filing confirmation.
Related Entries
Key Facts
- ISF = Importer Security Filing, also called 10+2.
- Filed by the importer of record, usually through a broker or forwarder.
- Due 24 hours before loading at origin, not before arrival.
- Ten importer elements plus two carrier elements.
- Most common errors: manufacturer and stuffing location fields.
- AMS is the carrier’s filing, ISF is yours. Different obligations.