ISF 10+2 filing is a mandatory U.S. Customs and Border Protection requirement that compels importers to submit 10 data elements — and ocean carriers to submit 2 — at least 24 hours before cargo is loaded onto any vessel bound for the United States. For anyone moving goods by ocean freight, understanding ISF compliance is not optional: missed or inaccurate filings carry penalties up to $5,000 per violation and can result in CBP holds that freeze your cargo at port.
What Is ISF 10+2? Definition and Legal Basis
Importer Security Filing (ISF) 10+2: A CBP pre-shipment data requirement, codified under 19 CFR Part 149, that mandates importers electronically transmit 10 specified data elements — and ocean carriers transmit 2 additional vessel-related data elements — to U.S. Customs and Border Protection no later than 24 hours before cargo is loaded aboard a vessel at a foreign port destined for the United States.
The ISF program — formally titled the “Importer Security Filing and Additional Carrier Requirements” — was authorized by the Security and Accountability for Every (SAFE) Port Act of 2006 (Public Law 109-347) and became a mandatory enforcement requirement on January 26, 2010. Before ISF, CBP had limited visibility into ocean cargo until a vessel was already en route. The 10+2 rule shifted that visibility to the origin port — giving CBP’s National Targeting Center (NTC) time to analyze cargo data and intercept high-risk shipments before they board.
The program covers all ocean vessel shipments arriving at any U.S. port. Air freight, land border crossings, and rail entries are governed by separate programs and are not subject to ISF 10+2 requirements.
According to CBP, approximately 13 million ocean containers enter U.S. ports each year. The ISF program exists to screen each of those shipments for terrorism risk, contraband, and trade fraud before they reach American shores.
The 10 Importer Data Elements and 2 Carrier Elements
Not all 10 importer elements share the same filing deadline. CBP distinguishes between elements required 24 hours before vessel loading and elements that can be updated closer to arrival.
The 10 Importer-Submitted Elements
| # | Data Element | Deadline | Notes |
|---|---|---|---|
| 1 | Manufacturer (or supplier) name & address | 24 hrs before loading | Party producing or supplying the goods |
| 2 | Seller name & address | 24 hrs before loading | Party selling goods to the U.S. buyer |
| 3 | Buyer name & address | 24 hrs before loading | U.S. party purchasing the goods |
| 4 | Ship-to name & address | 24 hrs before loading | First U.S. destination of the goods |
| 5 | Container stuffing location | 24 hrs before departure | Where goods were loaded into the container |
| 6 | Consolidator name & address | 24 hrs before departure | Party stuffing the container (if applicable) |
| 7 | Importer of record number | 24 hrs before loading | IRS EIN, SSN, or CBP-assigned number |
| 8 | Consignee number | 24 hrs before loading | IRS EIN or SSN of U.S. consignee |
| 9 | Country of origin | 24 hrs before loading | Country where goods were manufactured |
| 10 | Commodity HTS-6 number | 24 hrs before loading | First 6 digits of the HTS code (see hts.usitc.gov) |
Elements 5 and 6 (container stuffing location and consolidator) have a slightly later deadline — 24 hours before the vessel’s departure from the last foreign port — giving importers more time to confirm logistics details.
The 2 Carrier-Submitted Elements
Ocean carriers are responsible for filing:
- Vessel Stow Plan — submitted no later than 48 hours after departure from the last foreign port, or before arrival if the voyage is under 48 hours.
- Container Status Messages (CSMs) — transmitted as events occur (gate-in, loaded, discharged, etc.).
These two elements are the carrier’s obligation, not the importer’s. However, importers should confirm their carrier is compliant — CBP can penalize both parties for non-submission.
How ISF 10+2 Filing Works: Step-by-Step Process
The ISF workflow runs in parallel with your standard shipping process. Here is the sequence from purchase order to vessel departure:
Step 1 — Confirm the booking and vessel details. As soon as your freight forwarder or carrier confirms a vessel booking, obtain the vessel name, voyage number, bill of lading number, and estimated load date at the origin port. These are required to open an ISF transaction.
Step 2 — Send filing instructions to your licensed customs broker. Provide your broker with the commercial invoice (even a draft), packing list, and the booking confirmation. Your broker needs seller, buyer, manufacturer, ship-to party, country of origin, and the HTS-6 code for each commodity in the shipment. If you don’t have a broker yet, search all CBP-licensed customs brokers to find one before your first shipment.
Step 3 — Broker submits ISF through ACE or ABI. Your broker (or you, if you’re self-filing through the ACE Portal) transmits the ISF data electronically. CBP assigns a unique ISF transaction number and returns an acknowledgment — either accepted or rejected with error codes.
Step 4 — Monitor for CBP response and update if needed. CBP may flag the filing for review or request additional information. If any of the 10 data elements change — say, the ship-to address shifts to a different warehouse — your broker must file an amendment before the vessel arrives.
Step 5 — Link the ISF to the entry summary. When the goods arrive and your broker files the formal entry (CBP Form 3461 or 7501), the ISF transaction number is linked to that entry. CBP uses this link to verify consistency between pre-arrival data and the actual entry.
Step 6 — Retain records for five years. Under 19 USC 1508, importers must retain all entry-related records — including ISF filings and supporting documentation — for five years from the date of entry.
Regulatory Framework: What the CFR Actually Says
The legal backbone of ISF 10+2 sits in two places:
- 19 CFR Part 149 — “Importer Security Filing” — the primary regulatory authority. This part defines who must file, what data elements are required, the filing timeline, and CBP’s enforcement authority. Part 149.3 specifically enumerates the 10 importer elements; Part 149.4 addresses carrier requirements.
- 19 USC 1415 — the statutory authority under which CBP established the ISF program, derived from the SAFE Port Act mandate for advance cargo information on vessel shipments.
CBP enforces ISF through its Automated Targeting System (ATS), which scores each ISF filing for risk before the vessel loads. High-risk scores can result in a do-not-load order — meaning CBP instructs the foreign port to hold the container. This is a significant supply chain disruption: a missed sailing can delay a shipment by weeks and cost hundreds or thousands of dollars in demurrage, detention, and expediting fees.
For importers of regulated goods — pharmaceuticals, food, chemicals, automotive parts — ISF compliance intersects with other agency requirements. FDA Prior Notice, for example, runs on a separate timeline but uses overlapping data. If you import in regulated categories, consider working with a specialist; you can browse brokers by specialty to find brokers experienced in your product category.
Real-World Scenarios: ISF in Practice
Scenario 1 — First-time importer, single SKU from China. A small e-commerce business orders 500 units of a consumer electronics product from a Shenzhen factory. The factory ships the goods via ocean freight from Yantian port. The importer provides their broker with the commercial invoice and packing list 72 hours before loading. The broker files the ISF in ACE with the manufacturer’s address, the Shenzhen supplier as seller, the importer’s California warehouse as ship-to, and the 6-digit HTS code for the product. CBP accepts the filing and the shipment clears without examination.
Scenario 2 — Multi-supplier consolidation, missing data. A mid-size retailer is importing a consolidated container from three different manufacturers in Vietnam. The freight forwarder consolidates at a warehouse in Ho Chi Minh City before stuffing the container. The importer’s broker files the ISF with the three manufacturers listed but uses placeholder data for the consolidator (Element 6) because the forwarder hasn’t confirmed the stuffing location yet. The broker updates Element 6 within the window — no penalty. This scenario illustrates why the later deadline for Elements 5 and 6 exists: CBP built flexibility into the rule for exactly this situation.
Scenario 3 — Late filing, CBP hold. An apparel importer forgets to forward the booking confirmation to their broker until the day the vessel loads. The broker cannot file within the 24-hour window. CBP flags the shipment as ISF-delinquent. The container is selected for a tailgate examination upon arrival at the Port of Los Angeles. The exam adds four days to clearance time and costs the importer $1,200 in exam fees and detention charges — plus a $1,500 liquidated damages notice from CBP. The total cost of the late filing: over $2,700, not counting lost sales from delayed inventory.
Common ISF Mistakes and How to Avoid Them
Mistake 1 — Treating the 24-hour rule as flexible. Some importers assume “24 hours” is an approximate guideline. It is not. CBP’s ATS runs automated checks at the 24-hour mark. If the ISF is not transmitted and accepted by then, the shipment is flagged. Build your internal workflow to target 48 to 72 hours before loading — not 24.
Mistake 2 — Using incomplete HTS-6 codes. The ISF requires only the first 6 digits of the HTS code, but those 6 digits must be correct. Using a vague or wrong chapter heading to “get something filed” is a documented CBP violation. Use hts.usitc.gov to verify the correct heading before filing.
Mistake 3 — Filing the ISF but forgetting to update it. CBP allows amendments, and it expects them when data changes. If your ship-to address changes from a New Jersey warehouse to a Texas distribution center, you must amend the ISF before vessel arrival. Importers who don’t track changes between ISF filing and actual shipment arrival create discrepancies that attract examination.
Mistake 4 — Assuming your freight forwarder is also handling ISF. Freight forwarders and customs brokers perform different functions. Some freight forwarders offer ISF filing as a service; many do not. Confirm in writing who is responsible for ISF before the vessel is booked. The legal obligation belongs to the importer of record regardless of who drops the ball operationally. Learn more about how these roles differ in our article on 3PL with customs clearance and warehousing.
Mistake 5 — Ignoring ISF for FTZ or bonded warehouse entries. Goods destined for a Foreign Trade Zone or a bonded warehouse still require an ISF if they arrive by ocean vessel. This is a common misconception: the ISF obligation is triggered by the mode of transport and destination country (the U.S.), not by the final customs disposition of the goods.
Mistake 6 — Not retaining ISF records. Under 19 USC 1508, ISF filings are entry-related records subject to a five-year retention requirement. CBP can audit ISF records during a post-entry audit (CF-28 or CF-29 process). Importers who cannot produce ISF records during an audit face additional scrutiny.
Tools and Resources for ISF Compliance
Getting ISF right depends on having the right infrastructure and partners. Here are the key resources:
- ACE (Automated Commercial Environment) Portal — CBP’s trade processing system where ISF transactions are submitted and tracked. Self-filers can access ACE directly at cbp.gov; most importers use their broker’s ABI connection.
- CBP.gov ISF Resource Page — CBP’s official ISF guidance includes the regulatory text, FAQs, and filing instructions. The CBP publication “Importer Security Filing (ISF): What Every Trade Member Needs to Know” is worth downloading.
- HTS lookup tool — hts.usitc.gov is the authoritative source for verifying 6-digit HTS headings before ISF submission.
- NCBFAA member brokers — The National Customs Brokers & Forwarders Association of America maintains a directory of member brokers who are current on regulatory training, including ISF requirements.
- Licensed customs broker — For most importers, delegating ISF filing to a licensed customs broker is the most reliable path to compliance. Brokers file hundreds of ISFs per month and maintain direct ABI connections to CB