- Confirm the mode of transport. The ISF 10+2 rule discussed here applies to covered cargo arriving by ocean vessel, including containerized ecommerce replenishment.
- Assign the ISF importer and filing agent before booking. Confirm the legal entity, importer number, power of attorney, bond arrangement, and escalation contact.
- Send a structured data request to the seller, manufacturer, freight forwarder, and consolidator. Give each field an owner and a due date earlier than the legal cutoff.
- Verify the product description, origin, SKU, and HTS candidate against the Invoice Consistency Checker and current US HTS workflow. Do not use a generic catalog title.
- Reconcile parties and quantities against the purchase order, commercial invoice, packing list, booking, and bill of lading draft. Use the invoice and packing-list workflow for mismatches.
- Provide the eight early importer elements to the filer in time for transmission no later than 24 hours before lading. Do not use the carrier's documentation cutoff as a substitute for the legal deadline.
- Provide container stuffing location and consolidator as early as possible and no later than the applicable pre-arrival deadline. Keep the actual source and update trail.
- Obtain the accepted filing confirmation. If facts change, send the corrected data promptly, retain the amendment confirmation, and ensure the later entry record uses consistent information.
Guide
Importer Security Filing (ISF 10+2): Data, Deadline, and Ecommerce Workflow
Prepare an accurate ISF 10+2 for US-bound ocean cargo by assigning the importer, collecting the required data, controlling the 24-hour deadlines, and documenting broker corrections.
Answer Summary
Preparation checklist
ISF applies to covered cargo arriving in the United States by ocean vessel; it is not a general filing for air, truck, or rail shipments.
The “10” refers to importer data elements, while the “+2” describes carrier information requirements. The importer should focus on supplying accurate source data early enough for electronic filing.
A broker or filing vendor can transmit the ISF, but the ISF importer remains responsible for timely, accurate, and complete information.
ISF data should agree with the commercial invoice, purchase order, supplier and manufacturer records, booking, bill of lading, entry record, and later CBP Form 7501.
Required fields or decision table
Fields to prepare before the document draft
| Field or decision | What to prepare |
|---|---|
| Seller and buyer | Record the legal parties in the purchase transaction. Distinguish marketplace, trading company, manufacturer, consignee, and ultimate purchaser rather than copying a storefront name. |
| Importer and consignee numbers | Confirm the importer of record number or FTZ applicant identification and consignee number used for the shipment. Match the correct legal entity. |
| Manufacturer or supplier | Identify the entity that last manufactures, assembles, produces, or grows the commodity, or the supplier permitted by the applicable rule. Preserve the source record. |
| Ship-to party | Identify the first scheduled delivery party after release. Do not automatically substitute the buyer, importer, fulfillment network, or final customer. |
| Country of origin | Use manufacturing or production facts for each commodity. Country of export, seller location, consolidation point, and port of loading are separate facts. |
| Commodity HTSUS number | Provide the required HTSUS data at the permitted level and keep the product facts and source edition used to support the candidate. |
| Container stuffing location | Obtain the physical stuffing location from the factory, warehouse, or consolidator and update it if the plan changes. |
| Consolidator or stuffer | Record the party that stuffs the container or arranges stuffing. This may differ from the seller, carrier, freight forwarder, or manufacturer. |
| Shipment control fields | Keep booking, master and house bill references, vessel and voyage, foreign port, estimated lading and arrival dates, filing confirmation, amendments, and broker messages together. |
Step-by-step preparation
How to prepare the draft
Ecommerce example
How this looks in a seller workflow
A marketplace brand purchases three SKUs from a trading company. Two factories manufacture the goods, a third-party warehouse consolidates them, and the container sails from a different country than one factory location.
The brand should not list the trading company as manufacturer for every line or use the port country as origin. It collects manufacturer and origin by SKU, identifies the warehouse as stuffing location, identifies the consolidator, confirms the ship-to fulfillment center, and sends the structured file to its broker before the vessel cutoff.
When the warehouse changes the stuffing location, the brand sends an amendment rather than leaving the original location in the filing. The confirmation and corrected source file stay with the shipment record.
- Map each SKU to its manufacturer and origin.
- Separate seller, buyer, importer, consignee, ship-to, and consolidator.
- Collect data before the lading cutoff.
- Retain filing and amendment confirmations.
- Reconcile the ISF with the final entry summary.
Verification checklist
Review the record before it enters a shipment or filing workflow
- The shipment is covered vessel cargo, not an air shipment.
- The ISF importer and filing agent are assigned.
- Importer and consignee numbers match the intended entities.
- Manufacturer, origin, and HTS data are reviewed by SKU.
- Ship-to party is the first scheduled delivery party after release.
- Stuffing location and consolidator come from the actual logistics plan.
- The filing was accepted before the applicable deadline.
- Changes were amended and confirmations were retained.
- The ISF, invoice, packing list, bill of lading, and entry summary do not silently conflict.
Source-backed checks
What external guidance supports this workflow?
- CBP: When to submit an ISFCurrent CBP summary of applicability, timing, importer elements, electronic filing, and potential consequences.
- CBP Tips for New Importers and ExportersCBP explains that ISF is mandatory for covered ocean vessel shipments and can be filed by the importer or agent.
- CBP ISF 10+2 FAQOfficial detailed questions on responsibility, timing, bonds, amendments, parties, and data elements.
- 19 CFR Part 149Current regulatory text for importer security filing requirements.
Internal workflow links
Use the same catalog data in the next review step
- Create a Classification CasePaid workspace: retain product facts, HTS candidates, evidence, risk notes, and exports in one review record.
- Run a Catalog ReviewPaid workspace: review repeated SKUs and platform CSV rows with source-separated credits and history.
- Open Reviewed RecordsPaid workspace: keep reviewed fields and mapped exports available for later shipment work.
- Compare PlansCompare one-time and monthly credits for repeated customs-data workflows.
- Official SourcesVerify current CBP, USITC, agency, and carrier requirements before filing.
- MethodologySee how TariffCatalog separates facts, candidates, estimates, and final filing decisions.
- CorrectionsReport an outdated source or unclear workflow for editorial review.
Common mistakes
What to avoid
- Assuming ISF applies to air cargo.
- Waiting for the final commercial invoice when core data could have been collected earlier.
- Treating seller, manufacturer, consolidator, and carrier as the same party.
- Using country of export as country of origin.
- Submitting one generic HTS number for materially different products.
- Letting the agent file without reviewing source data or retaining confirmation.
- Ignoring a changed stuffing location, consolidator, manufacturer, or shipment plan.
- Assuming the broker becomes responsible for the importer's data accuracy.
Editorial
Editorial review note
Written by the TariffCatalog Editorial Team for ecommerce document preparation workflows. The page is designed as a preparation checklist, not a filing outcome.
Maintained by Ryan Cole, with review focused on ecommerce catalog, document, and source-check workflow clarity.
Document requirements may be required differently by carrier, destination, shipment value, and product facts. Use the methodology, sources, and corrections pages to understand how the page is maintained.
Official source note
References to verify
Use official sources, carrier guidance, postal operator rules, and destination requirements to verify before filing or shipping.
USITC HTS
Use this official source when checking final classification, duty treatment, or customs requirements.
CBPUse this official source when checking final classification, duty treatment, or customs requirements.
EU TARICUse this official source when checking final classification, duty treatment, or customs requirements.
UK Trade TariffUse this official source when checking final classification, duty treatment, or customs requirements.
FAQ
Common questions
Who is responsible for filing ISF 10+2?
The ISF importer is responsible and may use an authorized agent to transmit the filing.
When is an ISF due?
Most importer elements are due no later than 24 hours before lading on the US-bound vessel; stuffing location and consolidator have a separate as-early-as-possible and pre-arrival timing rule.
What are the ten importer data elements?
They cover seller, buyer, importer or FTZ identification, consignee, manufacturer or supplier, ship-to party, country of origin, commodity HTSUS data, container stuffing location, and consolidator.
Does ISF apply to air freight?
No. The 10+2 rule discussed here applies to covered cargo arriving by ocean vessel.
Can a customs broker file the ISF?
Yes. A licensed customs broker or other capable electronic filer may transmit it, but the importer remains responsible for the filing.
Can an ISF be amended?
Yes. Correct changed or initially flexible data promptly through the filer and retain the accepted amendment record.
What should an ecommerce seller retain after filing?
Keep the submitted data, source documents, filing acceptance, amendments, broker messages, booking and bill references, and the later entry summary.
Disclaimer
TariffCatalog provides informational tools and preparation workflows only. Verify final classification, rates, document requirements, and filing treatment with official sources or licensed professionals.