ISF Filing Explained: 10+2 Requirements, Deadline, Fees, and How to File

Quick answer: An ISF filing (Importer Security Filing, also called 10+2) is a mandatory advance cargo declaration that U.S. Customs and Border Protection (CBP) requires for ocean freight entering the United States. It must be submitted at least 24 hours before the cargo is loaded onto the vessel at the foreign port — not when the ship arrives. The importer of record is legally responsible for it, and failure to comply can lead to penalties of up to $5,000 per violation. As an approximate reference band, an ISF filing fee commonly runs about $25–$75 per filing; the exact cost for your shipment requires manual confirmation with your customs broker or filing provider.

TL;DR: ISF filing is not optional paperwork, and it is not something that happens automatically. For ocean shipments from China to the US, the importer of record must make sure twelve data elements reach CBP at least 24 hours before loading at origin. Late, inaccurate, or missing filings risk penalties, exams, and cargo holds. Filing is usually handled by a customs broker or freight provider, and a continuous customs bond typically covers the ISF bond requirement — but the legal responsibility stays with the importer.

If you are researching ISF filing, the practical question underneath is usually: "my first ocean shipment from China is booked — what exactly do I need to file, by when, and what happens if I get it wrong?" This guide answers all three: what an ISF filing is, the twelve data elements it contains, the real deadline, how it differs from AMS filing, what it costs in reference bands, and how the filing actually gets done.

Throughout, every dollar figure is an approximate reference band, not a binding price. Filing fees, bond costs, and penalty outcomes vary by shipment and provider, and any shipment-specific figures require manual confirmation with a customs broker or surety.

What is an ISF filing? (10+2 explained)

An ISF filing — Importer Security Filing, widely known as 10+2 — is an advance cargo information declaration required by U.S. Customs and Border Protection for goods arriving in the United States by vessel. It exists so CBP can screen cargo for security risk before it is loaded, not after it lands. The rule is codified in 19 CFR Part 149, and CBP's own Importer Security Filing '10+2' guidance is the authoritative overview.

The name "10+2" describes where the data comes from:

• 10 data elements supplied by the importer (or its agent), describing the goods and the parties involved.
• 2 data elements supplied by the carrier — the vessel stow plan and container status messages.

A few clarifications that prevent the most common misunderstandings:

• ISF applies to ocean freight only. Air freight does not require an ISF filing. If your goods fly, this rule does not apply to them.
• It is separate from customs entry. The ISF is a security filing, not the entry summary that determines duties. You still need an accurate HTS classification for the duty side.
• The importer of record is responsible. A broker or freight provider can submit the filing on your behalf, but liability for a late, inaccurate, or missing ISF filing sits with the importer — not the agent. For most commercial imports you will also need a customs bond in place; a continuous bond typically covers the ISF requirement for ocean entries.

The 12 data elements of an ISF filing

For cargo destined to arrive at a US port, the importer's ten elements are:

1. Seller — name and address of the last known seller of the goods.
2. Buyer — name and address of the last known buyer.
3. Importer of record number — the IRS, EIN, or CBP-assigned number of the party liable for duties.
4. Consignee number — the IRS, EIN, or CBP-assigned number of the party receiving the goods in the US.
5. Manufacturer (or supplier) — name and address of the entity that makes or supplies the goods.
6. Ship-to party — the name and address of the first deliver-to party after release.
7. Country of origin — where the goods were manufactured or produced.
8. Commodity HTS-6 — the Harmonized Tariff Schedule number to the six-digit level for each line item. This is where the security filing connects to your tariff work: a sloppy six-digit code that mismatches the commercial invoice is a common trigger for CBP questions.
9. Container stuffing location — where the goods were stuffed into the container.
10. Consolidator (stuffer) — the party who stuffed or arranged the stuffing of the container.

The carrier's two elements — the vessel stow plan and container status messages — are filed by the shipping line, not by you.

The practical takeaway: you cannot complete an ISF filing from memory. You need supplier details, the stuffing location, and the HTS-6 codes from your commercial documents, which is why the data collection has to start days before the vessel loads.

When should ISF be filed? Deadline, grace period, and penalties

The rule is precise: the ISF must be filed no later than 24 hours before the cargo is laden aboard the vessel at the foreign port. For a container loading in Shanghai on a Wednesday morning, the filing has to be complete by Tuesday morning — while the goods may still be moving from the factory to the port.

This is the belief shift that catches first-time importers: ISF cannot wait until after departure, and it certainly cannot wait until arrival. A filing submitted "once the ship is on the water" is already late.

What about the grace period you may have read about? CBP ended its flexible enforcement period years ago. ISF is fully enforced today, and the consequences of a late, inaccurate, or missing filing are real:

• Liquidated damages of up to $5,000 per violation, claimed against the bond.
• Increased exam likelihood — non-compliant shipments are more likely to be flagged for inspection, which adds days and exam fees.
• Cargo holds — freight can be held at the port until the filing is resolved, accruing storage and demurrage.
• Do-not-load orders — in the worst case, cargo is refused loading at origin until the ISF is in order.

Working back from the deadline, the safe operating habit is: confirm who files your ISF, and hand over the required data, at least 48–72 hours before vessel loading so there is time to correct errors. CBP also allows the ISF to be updated while the vessel is in transit if a data element changes.

ISF vs. AMS filing: key differences

ISF and AMS are routinely confused because both are advance filings to CBP for ocean cargo. They are separate requirements, and an ocean import from China typically needs both:

• Who files: the carrier (or NVOCC) files the AMS — the Automated Manifest System declaration built from the bill of lading. The importer (or its agent) files the ISF.
• What it contains: AMS is manifest data — the bill of lading, shipper, consignee, and cargo description as the carrier knows them. ISF is importer-sourced supply-chain data — seller, buyer, manufacturer, HTS-6, stuffing location — most of which the carrier never sees.
• Why it exists: AMS predates ISF and supports both security screening and manifest release. ISF was added specifically to give CBP a security picture of the supply chain behind the cargo.

The two filings must also be consistent with each other. A consignee or cargo description that differs between the AMS manifest and the ISF is a classic mismatch that draws CBP attention. Neither filing replaces the customs entry — duties are still assessed separately through the entry summary process.

ISF filing fee, ISF bond, and what it costs (reference bands)

There are two cost components, and they are easy to conflate:

1. The ISF filing fee — what a customs broker or filing service charges to prepare and submit the filing. As an approximate reference band, this commonly runs about $25–$75 per filing, sometimes bundled into a broader brokerage charge.
2. The ISF bond — the financial guarantee behind the filing. If you hold a continuous customs bond, it typically covers ISF obligations for all your ocean entries during the bond year. If you file on a single-entry basis, a single entry ISF bond is required per shipment, which adds per-shipment cost on top of the filing fee.

These are orientation figures, not quotes. Fees vary by provider and by whether the filing is bundled with customs entry work, and any shipment-specific cost requires manual confirmation. If you import regularly, the continuous-bond route usually works out simpler and cheaper than stacking single-entry ISF bonds — the same arithmetic that applies to the customs bond decision itself.

A quick case study. A US-based cross-border seller arranged their first ocean shipment of $85,000 of consumer goods from Shenzhen and assumed "the freight side" was handling all customs paperwork. Nobody filed the ISF — the seller thought the forwarder had it, the forwarder was only arranging transport, and the supplier did not know it was needed. The container arrived at Long Beach with no ISF on record. CBP flagged the shipment, the cargo sat while a late filing and penalty process played out, and between liquidated damages, exam fees, and roughly ten days of port storage and demurrage, the mistake cost several thousand dollars and delayed a seasonal inventory window. An ISF filing arranged before loading would have cost about $50. The lesson: "someone else is handling it" is not a filing strategy — confirm who files, and verify it was submitted, before the vessel loads.

How to file ISF for a China-to-US ocean shipment

Yes, you can file your own ISF — CBP permits self-filing through its ACE portal — but most importers route it through a licensed customs broker, because the data must be exact and it must match the manifest. The typical sequence:

1. Assign responsibility early. When you book freight, get a written answer to "who files the ISF for this shipment?" If your provider files it, confirm the fee and the data they need from you. If you are still comparing providers, look at Chinese logistics companies by route coverage and service scope, and check top-rated providers by route — whether ISF handling is included is a fair comparison question.
2. Collect the ten data elements from your commercial invoice, packing list, and supplier — seller, buyer, importer number, consignee number, manufacturer, ship-to party, country of origin, HTS-6 codes, stuffing location, and consolidator.
3. Submit at least 24–48 hours before vessel loading, earlier if documents are still moving. The filer transmits through CBP's ACE system and receives an acceptance or rejection.
4. Verify acceptance and keep the record. An ISF acceptance confirmation should come back for every shipment; match it against the bill of lading so the ISF and AMS data agree.
5. Update in transit if anything changes — CBP allows amendments before arrival for elements like the ship-to party.

If you ship ocean freight from China regularly, the real efficiency is building the ISF data collection into your standard booking checklist so it stops being a per-shipment scramble. Route and mode choices upstream affect how much customs work lands on you — our guide to shipping from China to the USA covers the mode and cost trade-offs, and how our route data is sourced and bounded explains what provider data can and cannot tell you.

Frequently asked questions

What is the ISF filing?

The ISF filing — Importer Security Filing, also called 10+2 — is a mandatory advance cargo declaration that CBP requires for ocean shipments entering the United States. It collects ten supply-chain data elements from the importer plus two from the carrier, and it must be submitted at least 24 hours before cargo is loaded at the foreign port.

Can I file my own ISF?

Yes. CBP allows importers to self-file through the ACE portal, and there are online ISF filing services as well. In practice, most importers use a licensed customs broker because the filing must be accurate, on time, and consistent with the carrier's manifest. Whoever submits it, the legal responsibility for a late or inaccurate ISF filing stays with the importer of record.

When should ISF be filed?

No later than 24 hours before the cargo is laden aboard the vessel at the foreign port. The practical habit is to submit 48–72 hours before loading so there is room to correct rejected or incomplete data. Filing after departure, or on arrival, is late and can trigger penalties, exams, and holds.

What are the key differences between ISF and AMS filing?

Three: who files, what they contain, and why they exist. The carrier files AMS as manifest data from the bill of lading; the importer (or its agent) files ISF as supply-chain data such as seller, buyer, manufacturer, HTS-6 codes, and stuffing location. Both are required for ocean imports, neither replaces the customs entry, and the two filings must be consistent with each other.

---

Ready to plan the rest of your shipment? Get in touch or compare providers to see route coverage, service scope, and price bands side by side.

Disclaimer: Figures in this article — including filing fees, bond costs, and penalty amounts — are approximate reference bands for orientation only, not binding prices, legal advice, or a promise of any regulatory outcome. ISF requirements, enforcement practices, and fees vary by shipment, commodity, and provider, and shipment-specific obligations and costs require manual confirmation with a licensed customs broker or surety. SaveOnShip is a route lookup and comparison platform, not a carrier, freight forwarder, customs broker, surety, or booking service.