Which leg of the route needs an ISF review?
Importer Security Filing concerns cargo arriving in the United States by vessel, subject to the applicable rules and exceptions. For a multi-leg shipment, draw each arrival and mode before asking the filer for a deadline. A container’s earlier ocean trip to Mexico does not turn a later truck crossing into a US vessel arrival.
Classify the actual itinerary
| Route | ISF question to resolve | Next operational step |
|---|---|---|
| Mexican plant to a US destination by truck | The US entry leg is road transport | Organize road-entry, carrier and broker requirements for that leg |
| Asian port to a Mexican port, then truck into the US | Determine whether any vessel leg also arrives at a US port | If there is no US vessel arrival, plan the Mexican import and later US road entry separately |
| Mexican or other foreign port to a US port by ocean | Review Part 149 for the US-bound cargo and shipment type | Identify the ISF importer/filer, data owners and loading deadline |
| Cargo remaining on board, or US in-bond IE/T&E transit | Different data and timing provisions may apply | Give the full itinerary and intended treatment to the filer before loading |
Bulk and qualifying break-bulk treatment require their own review under Part 149. Do not infer an exemption from the commodity label alone. 19 CFR 149.2
Identify the filer and the data owners
The ISF importer is defined for this filing under 149.1; the role can differ by shipment type. An authorized agent can transmit the filing under 149.5. Confirm who is responsible and who supplies corrections. “10+2” includes importer data and separate carrier requirements; the importer’s ten fields are not twelve buyer-supplied answers.
| Importer data group | Assign the source |
|---|---|
| Seller, buyer, importer/FTZ identifier and consignee number | Commercial parties and the importer’s customs team |
| Manufacturer/supplier, ship-to party, origin and commodity HTSUS | Supplier, consignee and classification/origin record owners |
| Container stuffing location and consolidator | Party arranging or performing the stuffing/consolidation |
For the standard ten-element filing, 149.2 generally requires the first eight elements no later than 24 hours before foreign loading, with specific flexibility for certain elements. Stuffing and consolidator information is due as early as possible, no later than 24 hours before US arrival, or upon foreign loading when the voyage to the closest US port is shorter than 24 hours. The detailed rules also address short voyages, updates and shipment categories. Have the filer establish the actual cutoff and any permitted provisional information. Timing rules · Data definitions
Make a loading handoff record
Record the intended vessel/loading event, bill-of-lading reference, US arrival and any transit status. For every data group, name the owner, current value or unresolved item, source document and delivery time to the filer. Ask who will track changes before arrival and confirm the accepted filing reference.
If an instruction changes the port or route, ask the filer which information must be updated or withdrawn. Confirm the facts early enough to resolve a missing origin, supplier or stuffing location before its applicable deadline.
Continue with the border operation
Use the cross-border logistics guides for Mexican road movements, warehouse release and the broker handoff. Confirm Carta Porte and other Mexican transport requirements independently of ISF. This page helps select the correct filing question; it neither transmits an ISF nor verifies the parties’ filing eligibility.
Continue with your records
Official sources and review scope
Source check 2026-11-12. This editorial guide organizes questions and records for a Mexico–US transaction. Confirm the rules, effective dates and facts with the responsible importer and qualified professionals before filing or committing goods.