ISF & AMS Filing Guide — Mandatory US Customs Requirements for China Shipments

Two filing deadlines are non-negotiable for ocean freight imports to the United States from China: ISF (Importer Security Filing) and AMS (Automated Manifest System). Both carry steep penalties for non-compliance — ISF late filings can cost $5,000 per violation.

What Is ISF (Importer Security Filing)?

ISF (ISF 10+2) is a mandatory advance cargo declaration required by CBP for all ocean freight entering the United States. The "10+2" refers to the 10 data elements from the importer and 2 from the carrier.

ISF 10+2: What Data You Must Provide (72 Hours Before Departure)

• Manufacturer (factory) name and address in China
• Seller name and address
• Buyer name and address (your US company)
• Ship-to party name and address in the US
• Country of origin
• HS code (10-digit tariff classification)
• Container stuffing location
• Consolidator name and address (if applicable)
• ISF importer of record number (your US Customs bond number)
• Bond holder name and address

ISF Filing Deadline: 72 Hours Before Departure

ISF must be submitted at least 72 hours before the vessel departs the foreign port. Late ISF filings trigger:

• $5,000 fine per violation — one of the steepest penalties in US import compliance
• Possible cargo holds and examination delays
• Potential liquidated damages claims against your Customs bond

ISF Bond Requirement

You need a US Customs bond to file ISF:

• Single Entry Bond: Covers one entry. Cost: ~$50–$200. Best for occasional importers.
• Continuous Bond: Covers all entries for one year. Cost: $500–$1,000. Best for regular importers.

What Is AMS (Automated Manifest System)?

AMS is the US cargo declaration system for ocean freight, filed by the carrier or NVOCC. Required 24 hours before departure from the foreign port. Fees typically: $25–$60 per shipment.

ISF vs AMS: Key Differences

• Deadline: ISF 72 hours before departure; AMS 24 hours before departure
• Filed by: ISF by the importer/broker; AMS by the carrier/NVOCC
• Data: ISF requires buyer/seller/supplier details; AMS focuses on container-level cargo
• Penalty: ISF up to $5,000 per violation; AMS also significant

Common ISF Mistakes to Avoid

• Missing the 72-hour deadline: The most costly mistake. Send ISF data to your forwarder at least 5 business days before departure.
• HS code errors: Wrong HS codes on ISF can cause issues at entry.
• Manufacturer vs supplier confusion: ISF asks for the factory address, not your supplier's office.
• Blank ISF fields: CBP rejects ISF submissions with missing mandatory fields.

Working with Your China Supplier on ISF Data

Develop a standard ISF data template and send it to your supplier at order confirmation. Include factory name (English and Chinese), full factory address, contact person, and HS codes. Store this data for reuse on repeat orders.

Key Takeaways

• ISF at least 72 hours before vessel departure — $5,000 fine per violation
• AMS 24 hours before departure — filed by the carrier/NVOCC
• You need a US Customs bond (single entry or continuous) to import ocean freight
• Build a standard ISF data collection process with your Chinese suppliers
• Confirm ISF filing in writing with your forwarder and keep records for at least 5 years