ISF 10+2 Filing: Complete Compliance Guide for Importers

Every ocean shipment entering the United States requires an Importer Security Filing (ISF)—and getting it wrong can mean penalties up to $10,000 per violation, cargo holds, and major supply chain disruptions.

Whether you're a seasoned importer or handling your first vessel shipment, understanding ISF 10+2 requirements is essential for smooth customs clearance.

Key Takeaways

ISF must be filed at least 24 hours before cargo is loaded onto the vessel at the foreign port
The "10+2" name refers to 10 data elements from importers plus 2 from carriers
Penalties range from $5,000 to $10,000 per violation—and CBP actively enforces them
Accurate HTS classification is critical for ISF compliance
Late or inaccurate filings can result in cargo holds and increased inspections

What is ISF 10+2?

The Importer Security Filing (ISF), commonly called "10+2," is a U.S. Customs and Border Protection (CBP) requirement for all ocean cargo entering the United States. Implemented on January 26, 2009, this rule enhances cargo security by requiring advance shipment information.

The "10+2" name breaks down as:

10 data elements required from the importer (or their agent)
2 data elements required from the ocean carrier

This filing applies to all commercial cargo arriving by vessel, regardless of value or shipment size.

The 10 Importer Data Elements

Every ISF filing must include these ten pieces of information:

1. Importer of Record Number

Your IRS Employer Identification Number (EIN), Social Security Number, or CBP-assigned importer number.

2. Consignee Number

The IRS number of the party to whom the goods are being shipped in the United States.

3. Seller Name and Address

The entity selling the goods to the buyer. This may differ from the manufacturer.

4. Buyer Name and Address

The party purchasing the goods. For related-party transactions, this is typically the U.S. importer.

5. Manufacturer (or Supplier) Name and Address

The entity that last manufactured, assembled, produced, or grew the commodity. This is critical for compliance.

6. Ship-to Party Name and Address

The final delivery destination in the United States.

7. Container Stuffing Location

The physical address where the goods were loaded into the container.

8. Consolidator (Stuffer) Name and Address

The party responsible for loading the goods into the container.

9. Country of Origin

The country where the goods were manufactured or grown.

10. Commodity HTS Code

The 6-digit Harmonized Tariff Schedule code at minimum. While the full 10-digit HTS code isn't required for ISF, accuracy here is essential—incorrect classification can trigger enhanced scrutiny. See our complete HTS code lookup guide for classification best practices.

The 2 Carrier Data Elements

Ocean carriers must provide:

Vessel Stow Plan – The location of cargo containers on the vessel
Container Status Messages – Updates on container movements

These are typically handled automatically through carrier systems.

ISF 5 vs. ISF 10+2: What's the Difference?

Most importers deal with ISF 10+2, but there's a streamlined version for specific situations:

ISF 5 applies to:

Foreign Remaining on Board (FROB) cargo
Cargo transiting through the U.S.
Foreign Trade Zone (FTZ) shipments
Immediate exportation (IE) cargo

ISF 5 requires only 5 data elements:

Booking party name and address
Foreign port of unlading
Place of delivery
Ship-to party
Bill of Lading number

Filing Deadlines: The 24-Hour Rule

ISF must be submitted at least 24 hours before cargo is loaded onto the vessel at the foreign port of departure—not 24 hours before arrival in the U.S.

This timeline matters because:

Vessels often load cargo days before departure
Your ISF deadline could be before the vessel even sails
Missing this deadline triggers automatic penalties

Bulk and Break Bulk Exceptions

For bulk and break bulk cargo, the ISF must be filed 24 hours before arrival at the first U.S. port instead of before loading.

Who Files the ISF?

The importer of record is legally responsible for ISF compliance. However, in practice, most importers delegate filing to:

Licensed customs brokers
Freight forwarders
ISF filing services

Important: Even when using an agent, the importer remains responsible for accuracy. If your broker files incorrect information, you still face the penalties.

ISF Penalties: What's at Stake

CBP takes ISF compliance seriously. Penalties include:

Violation	Penalty Range
Late filing	$5,000 - $10,000
Inaccurate information	$5,000 - $10,000
Failure to file	$5,000 - $10,000
Multiple violations	Liquidated damages up to $50,000

Beyond monetary penalties, non-compliance can trigger:

Cargo holds at the port
Increased inspections on future shipments
Do Not Load (DNL) orders preventing cargo from being loaded

For broader compliance strategies, see our guide on CBP compliance: avoiding penalties and audits.

Common ISF Filing Mistakes

Avoid these frequent compliance failures:

1. Missing the 24-Hour Deadline

The deadline is before loading, not before departure. Work backwards from the vessel's loading schedule.

2. Incorrect Manufacturer Information

CBP cross-references manufacturer data with other filings. Inconsistencies trigger red flags. Get the actual manufacturer name and address—not the trading company.

3. Wrong HTS Codes

While ISF only requires 6 digits, incorrect classification can lead to enhanced screening. Use accurate HTS codes from the start. Review our guide on top 10 HTS classification mistakes to avoid common errors.

4. Mismatched Bill of Lading Numbers

The ISF must match the BOL exactly. Even small discrepancies (extra spaces, different formats) can cause issues.

5. Incomplete Addresses

Partial addresses or P.O. boxes for physical locations trigger rejections. Include full street addresses.

ISF Amendments and Updates

ISF filings can be amended up to 24 hours before vessel arrival at the first U.S. port. After that window closes, amendments require CBP approval.

Best practice: File accurate information initially. While amendments are allowed, frequent corrections increase scrutiny on your account.

How AI Streamlines ISF Compliance

Modern customs automation tools can significantly reduce ISF compliance burden:

Automatic HTS classification ensures accurate commodity codes from the start
Data validation catches errors before filing
Document extraction pulls required information from commercial invoices and packing lists
Deadline tracking alerts you before critical cutoffs
Amendment management tracks changes and maintains audit trails

Duty Simulator helps customs professionals get accurate HTS classifications quickly, reducing the risk of ISF errors and CBP penalties.

ISF Filing Process: Step by Step

Step 1: Gather Required Information

Collect all 10 data elements from your supply chain partners. Request this information as part of your purchase order process—don't wait until the vessel is loading.

Step 2: Verify HTS Classification

Confirm your commodity codes are accurate. Incorrect HTS codes are one of the most common ISF issues.

Step 3: Submit Through ACE

File the ISF through CBP's Automated Commercial Environment (ACE) via:

Your customs broker's system
Self-filing software connected to the Automated Broker Interface (ABI)
Third-party ISF filing services

Step 4: Confirm Bill of Lading Linkage

Ensure your ISF is properly linked to the ocean carrier's Bill of Lading. Mismatches cause clearance delays.

Step 5: Monitor for CBP Responses

Watch for CBP messages indicating holds, errors, or additional information requests. Address any issues immediately.

ISF and Other CBP Requirements

ISF works alongside other customs filings:

Entry Summary (CBP Form 7501) – Filed separately for duty calculation
Automated Manifest System (AMS) – Carrier-provided vessel and cargo data
Prior Notice (FDA) – Additional requirements for food products

ISF doesn't replace other filings—it's an additional security layer.

Frequently Asked Questions

Does ISF apply to air cargo?

No. ISF 10+2 only applies to ocean shipments. Air cargo has different advance filing requirements.

What about shipments from Canada or Mexico?

ISF applies to vessel shipments only. Truck and rail shipments from Canada and Mexico use different programs (ACE eManifest).

Can I file ISF myself?

Yes, but you need to be registered in CBP's ACE system and have ABI-certified software. Most importers use customs brokers.

What if my supplier won't provide manufacturer information?

This is a common challenge. Work with your supplier to understand their supply chain. If they use trading companies, you need the actual manufacturer details—not the intermediary.

How long must I retain ISF records?

Keep ISF records for 5 years from the date of entry. CBP can audit past filings within this window.

Conclusion

ISF 10+2 compliance is non-negotiable for ocean importers. The combination of tight deadlines, detailed data requirements, and significant penalties makes it essential to get right the first time.

Key success factors:

Establish data collection processes with suppliers
Use accurate HTS classification
File early—don't push the 24-hour deadline
Verify BOL linkage before cargo loads
Maintain clean records for audits

Accurate commodity classification is the foundation of ISF compliance. Get started with Duty Simulator to ensure your HTS codes are right from the start.

Need help with HTS classification for your ISF filings? Try Duty Simulator for AI-powered customs classification that reduces errors and speeds up compliance.