ISF Filing: The Complete Guide to 10+2 Requirements
Everything you need to know about Importer Security Filing to avoid costly penalties and ensure smooth ocean imports
What is ISF Filing?
The Importer Security Filing (ISF), commonly known as "10+2", is a U.S. Customs and Border Protection (CBP) regulation that requires importers and their agents to electronically submit specific shipment information before cargo is loaded onto ocean vessels bound for the United States.
Implemented in 2009 as part of the Security and Accountability For Every Port Act (SAFE Port Act), the ISF requirement was designed to enhance cargo security and improve CBP's ability to identify high-risk shipments before they reach U.S. shores.
Important: Ocean Shipments Only
ISF filing is only required for ocean freight. It does not apply to shipments arriving by air, truck, or rail. This is exclusively for containerized cargo, break bulk, and roll-on/roll-off (Ro-Ro) shipments entering the U.S. by vessel.
Why Was ISF Filing Created?
The ISF requirement addresses a critical security gap in the international supply chain. Before ISF, CBP often received limited advance information about incoming ocean cargo, making it difficult to assess security risks and identify potentially dangerous shipments.
By requiring detailed information 24 hours before cargo is loaded at the foreign port, CBP can:
- Conduct risk assessments before cargo departs foreign ports
- Target high-risk shipments for inspection upon arrival
- Prevent security threats from entering U.S. commerce
- Expedite clearance for compliant, low-risk cargo
Who Must File an ISF?
The responsibility for filing the ISF falls on the "ISF Importer" – defined by CBP as the party causing goods to arrive within the limits of a port in the United States by vessel. This is typically:
- 1The Goods OwnerThe party who owns the merchandise being imported
- 2The PurchaserThe party who has purchased or agreed to purchase the goods
- 3The ConsigneeThe party to whom the goods are being shipped
- 4The Authorized AgentSuch as a licensed customs broker acting on behalf of the importer
Ultimate Responsibility
Even if you hire a customs broker or freight forwarder to file your ISF, you as the importer remain ultimately responsible for ensuring the information is complete, accurate, and submitted on time. Choose your service providers carefully!
What Cargo Requires ISF Filing?
ISF filing is required for:
- ✓ Containerized cargo
- ✓ Break bulk shipments
- ✓ Roll-on/Roll-off (Ro-Ro) cargo
- ✓ All commercial ocean imports
- ✗ Bulk cargo (grain, coal, oil)
- ✗ Air freight
- ✗ Truck/rail shipments
- ✗ Certain exempt cargo
The 10+2 Data Elements Explained
The "10+2" designation refers to the 10 data elements required from the importer and 2 data elements required from the ocean carrier. Let's break down exactly what information you need to provide.
The 10 Importer Elements
Manufacturer (or Supplier) Name and Address
The name and address of the entity that last manufactures, assembles, produces, or grows the goods, or the supplier if the manufacturer is unknown.
Seller Name and Address
The last known entity by whom the goods are sold or agreed to be sold. If the goods are to be imported otherwise than in pursuance of a purchase, the name and address of the owner of the goods must be provided.
Buyer Name and Address
The last known entity to whom the goods are sold or agreed to be sold. If the goods are to be imported otherwise than in pursuance of a purchase, the name and address of the owner of the goods must be provided.
Ship To Name and Address
The first deliver-to name and address in the United States, which may be different from the buyer's address.
Container Stuffing Location
The name and address of the physical location where the goods were stuffed into the container.
Consolidator (Stuffer) Name and Address
The name and address of the party who stuffed the container or the Non-Vessel Operating Common Carrier (NVOCC) that arranged for the stuffing of the container.
Importer of Record Number
The IRS/EIN number, Social Security Number, or CBP assigned number of the entity liable for payment of all duties and responsible for meeting all statutory and regulatory requirements.
Consignee Number
The IRS/EIN number, Social Security Number, or CBP assigned number of the party to whom the goods will be delivered.
Country of Origin
The country where the goods were manufactured, produced, or grown as determined by the applicable rules of origin.
Commodity HTSUS Number (6-digit minimum)
The Harmonized Tariff Schedule of the United States number for the imported goods. While only 6 digits are required for ISF, providing the full 10-digit code is recommended for accuracy.
The +2 Carrier Elements
The ocean carrier (shipping line) is responsible for providing these two additional data elements:
Vessel Stow Plan
Details showing where containers are physically located on the vessel
Container Status Messages
Updates about container movements, including arrival and discharge information
Good News for Importers
As an importer, you only need to worry about the 10 importer elements. The carrier will handle the +2 elements automatically as part of their standard procedures.
Filing Deadlines & Timeline
Timing is critical with ISF filing. Missing the deadline can result in significant penalties and cargo delays. Here's exactly when you need to file:
24 Hours Before Loading
Your ISF must be filed at least 24 hours before cargo is laden aboard the vessel at the foreign port
Understanding the Two Filing Stages
CBP recognizes that some information may not be available 24 hours before loading. Therefore, ISF filing has two stages:
24 Hours Before Loading
At minimum, these elements must be filed:
- ✓ Manufacturer/Supplier
- ✓ Seller
- ✓ Buyer
- ✓ Ship To
- ✓ Container Stuffing Location
- ✓ Consolidator
24 Hours Before Arrival
All elements must be accurate and complete:
- ✓ Importer of Record Number
- ✓ Consignee Number
- ✓ Country of Origin
- ✓ HTSUS Number
- ✓ Plus all Stage 1 elements (final)
Best Practice: File Early and Accurately
While CBP allows updates up to 24 hours before arrival, it's best practice to file complete and accurate information as early as possible. This reduces your risk of penalties and ensures smooth cargo clearance.
ISF Timeline Example
How to File Your ISF
ISF filings must be submitted electronically to CBP through one of two systems: the Automated Broker Interface (ABI) or CBP's Automated Commercial Environment (ACE). Here are your filing options:
Option 1: Hire a Licensed Customs Broker (Recommended)
Best for: Most Importers
The most common and recommended approach is to work with a licensed customs broker who will file your ISF on your behalf. Customs brokers are experts in CBP regulations and have the necessary systems and credentials to file ISFs.
Advantages:
- ✓ Expert knowledge of CBP requirements
- ✓ Reduced risk of errors and penalties
- ✓ They handle all technical filing requirements
- ✓ Can coordinate with your freight forwarder
- ✓ Often handle customs entry as well
Your Responsibilities:
- • Provide complete and accurate information
- • Provide information in time to meet the 24-hour deadline
- • Verify the information is correct
Option 2: Self-File Through Authorized Software
Best for: Experienced High-Volume Importers
Some large importers choose to file ISFs directly using authorized ISF software providers. This requires more expertise and infrastructure. Learn more about ABI software and how it works.
Requirements:
- • Software certified to connect to ACE/ABI
- • In-depth knowledge of ISF requirements
- • Dedicated compliance staff
- • Continuous bond with ISF provisions
Advantages:
- ✓ Direct control over filing process
- ✓ Potentially lower costs for high volumes
- ✓ Immediate visibility into filing status
Step-by-Step Filing Process
Obtain a Customs Bond
Before you can file an ISF, you must have a customs bond that includes ISF provisions. This can be a single transaction bond or a continuous bond (recommended for frequent importers).
Gather Required Information
Collect all 10 data elements from your suppliers, manufacturers, and freight forwarders. Start this process as soon as you place your order to ensure you have everything in time.
Verify Information Accuracy
Double-check all information for accuracy. Pay special attention to addresses, country codes, and HTSUS numbers. Errors can result in penalties.
Submit Filing 24+ Hours Before Loading
Provide the information to your customs broker or submit through your software at least 24 hours before cargo loads. Earlier is better to allow time for corrections if needed.
Receive Confirmation
You or your customs broker will receive an acceptance message from CBP confirming the ISF was received and accepted.
Update if Necessary
If any information changes or if you filed preliminary information, submit updates before the cargo arrives (at least 24 hours before arrival at the first U.S. port).
Monitor for CBP Requests
Stay alert for any questions or additional information requests from CBP regarding your ISF. Respond promptly to avoid delays or holds on your cargo.
Penalties & Consequences
CBP takes ISF compliance seriously. Failure to file an ISF accurately and on time can result in significant financial penalties and operational disruptions.
$5,000
Per Violation
CBP may issue liquidated damages of $5,000 for each violation, including late filing, inaccurate information, or failure to file
Types of Violations
Late Filing
Filing the ISF after the 24-hour deadline before vessel loading, even by a few minutes
Inaccurate Information
Providing incorrect data elements, such as wrong manufacturer addresses, incorrect HTSUS codes, or false country of origin
Incomplete Filing
Missing one or more of the required 10 data elements
No Filing
Failing to file an ISF at all for cargo that requires it
Additional Consequences
Beyond financial penalties, ISF violations can result in:
Cargo Holds & Delays
CBP may withhold release of your cargo or refuse to grant a permit to unlade, causing significant supply chain disruptions and additional storage fees.
Increased Scrutiny
Repeated violations may result in your shipments being flagged for additional inspections, causing further delays and costs.
Risk of Seizure
If cargo is unladen without permission due to missing ISF filing, it may be subject to seizure by CBP.
Financial Impact
Demurrage and detention charges can quickly accumulate while your cargo sits waiting for clearance.
Mitigation Options
If you receive a penalty notice, you may be able to mitigate or challenge it by demonstrating reasonable care, providing evidence of corrective actions, or showing that the violation was due to circumstances beyond your control. Consult with your customs broker or a trade attorney promptly.
Common Mistakes to Avoid
Learn from others' mistakes. Here are the most common ISF filing errors and how to prevent them:
Mistake #1: Waiting Until the Last Minute
Many importers wait until right before the 24-hour deadline to gather information and file their ISF. If there's any missing or incorrect information, there's no time to fix it before the deadline.
✓ Solution:
Start gathering ISF information as soon as you place your purchase order. Aim to file at least 48-72 hours before the loading deadline to allow time for corrections.
Mistake #2: Using Generic "Unknown" Information
Filing an ISF with placeholder information like "Unknown" or "To Be Advised" for required fields is a violation, even if you plan to update it later.
✓ Solution:
Work closely with your suppliers to ensure you have real, specific information for all data elements. If certain information isn't available, wait to file until you have it rather than filing incomplete data.
Mistake #3: Incorrect HTSUS Classification
Guessing at the HTSUS code or using an outdated classification is one of the most common errors. Wrong codes can lead to penalties and duty assessment issues.
✓ Solution:
Research the correct HTSUS code using the official database at hts.usitc.gov. When in doubt, consult with your customs broker or request a binding ruling from CBP. Learn proper classification in our HTS classification guide.
Mistake #4: Wrong Manufacturer vs. Supplier
Confusing the manufacturer with the supplier is a frequent error. CBP wants to know where the goods were actually made, not just who sold them to you.
✓ Solution:
Ask your supplier for the specific factory name and address where goods were manufactured. If unknown, you can use the supplier's information but must make reasonable efforts to identify the actual manufacturer.
Mistake #5: Failing to Update Changed Information
Filing the ISF and then forgetting to update it when details change (like the ship-to address or container number) can result in penalties for inaccurate information.
✓ Solution:
Maintain communication with all parties in your supply chain. If anything changes, update your ISF immediately, but no later than 24 hours before vessel arrival.
Mistake #6: Not Having a Proper Customs Bond
Attempting to file an ISF without an active customs bond that includes ISF provisions will result in rejection of your filing.
✓ Solution:
Secure a continuous customs bond before you start importing. Work with your customs broker or a surety company to ensure your bond includes all necessary provisions, including ISF coverage.
ISF Filing Best Practices
Follow these industry best practices to ensure smooth, compliant ISF filing every time:
Establish Clear Communication Channels
Set up direct communication with your suppliers, freight forwarders, and customs broker. Create a standard process for collecting ISF data with every order.
Create an ISF Checklist
Develop a checklist of all 10 required data elements and verify each one before submission. Use the same checklist for every shipment to ensure nothing is missed.
File Early, Update as Needed
File your ISF as soon as you have accurate information, ideally 48-72 hours before loading. This gives you a buffer to make corrections if issues arise.
Maintain Accurate Records
Keep detailed records of all ISF filings, confirmations, and communications. CBP may request documentation up to 5 years after entry.
Verify Manufacturer Information
Don't assume your supplier is the manufacturer. Ask for the actual factory name and address, and verify the information through additional documentation.
Use Technology & Automation
Consider using supply chain management software that integrates with your customs broker's system to automate ISF data collection and filing.
Train Your Team
Ensure everyone involved in your import process understands ISF requirements and their role in compliance. Regular training prevents costly mistakes.
Partner with Experienced Brokers
Work with licensed customs brokers who have proven experience with ISF filings. Their expertise can save you thousands in penalties and delays. Explore our brokerage services or self-filing software options.
Frequently Asked Questions
Do I need an ISF for air freight shipments?
No. ISF filing is only required for cargo arriving in the U.S. by ocean vessel. Air, truck, and rail shipments do not require ISF filings, though they have other documentation requirements.
Can I file my own ISF, or do I need a customs broker?
You can file your own ISF if you have authorized software that connects to CBP's ACE system and the expertise to do so correctly. However, most importers use a licensed customs broker because of the complexity and risk of penalties for errors.
What happens if my supplier won't provide manufacturer information?
This is a common challenge. You must exercise "reasonable care" to obtain the information. Document your attempts to get the data from your supplier. If truly unavailable, you can use the supplier's information, but you should continue efforts to identify the actual manufacturer and update the ISF once obtained.
How much does ISF filing cost?
ISF filing fees typically range from $25 to $75 per shipment when using a customs broker. Some brokers include ISF filing in their overall customs clearance package. The cost is much lower than the potential $5,000 penalty for non-compliance.
Can I update my ISF after filing?
Yes. You can and should update your ISF if information changes or if you filed preliminary information. Updates must be made before the vessel arrives at the first U.S. port, preferably at least 24 hours before arrival.
Is ISF the same as customs entry?
No. ISF is a separate security filing requirement that must be completed before cargo loads. Customs entry (also called entry summary or consumption entry) is the formal declaration of goods for import and payment of duties, which happens after cargo arrives. Both are required for ocean imports.
Do I need a separate ISF for each container?
Not necessarily. If multiple containers on the same vessel are part of the same shipment and going to the same consignee, they can be included in a single ISF filing. However, if containers have different origins, manufacturers, or consignees, separate ISFs may be required.
What is a continuous bond and do I need one for ISF?
A continuous customs bond is a type of surety bond that covers all your imports for a 12-month period. If you import regularly, a continuous bond is more cost-effective than single-entry bonds. Your bond must include ISF provisions, which most do by default. The minimum continuous bond is typically $50,000.
Can I be penalized for my freight forwarder's or broker's mistakes?
Yes, unfortunately. As the importer, you are ultimately responsible for the ISF, even if you hire someone to file it on your behalf. This is why it's crucial to work with reputable, experienced service providers and to verify that the information you provide to them is accurate.
What is "reasonable care" in the context of ISF filing?
Reasonable care means taking appropriate steps to ensure that your ISF information is complete and accurate. This includes verifying supplier information, researching correct HTSUS codes, maintaining documentation of your efforts, and working with qualified professionals. Demonstrating reasonable care can help if you need to challenge a penalty.
Related Resources
Customs Bonds Guide
Learn about continuous and single-entry bonds required for ISF filing
HTS Classification Guide
Master the 10-digit HTSUS codes required for ISF filings
Import Documentation Guide
Complete overview of all required import documents
ISF Filing Best Practices
Proven strategies to avoid the most expensive ISF mistakes
Self-Filing Software
File your own ISF and entries with our ABI-certified platform
Full Brokerage Services
Let our licensed brokers handle your ISF and customs entries
Import Entry Review Checklist
Download our free pre-submission verification checklist to ensure your ISF and customs entries are complete and accurate. Reduce errors and avoid costly delays.
Need Help With ISF Filing?
Let Strix handle your ISF filings so you can focus on growing your business. Our experienced customs brokers ensure accurate, on-time filings every time.