A Shipper’s Letter of Instruction, or SLI, is an export document in which the shipper gives written instructions to a freight forwarder or carrier about how a shipment should be handled, documented, and exported. It often includes details such as exporter and consignee information, cargo description, Incoterms, export classification, value, destination, routing, and filing instructions. An SLI may also authorise the forwarder to submit export information to customs or government systems on the shipper’s behalf.
A Shipper’s Letter of Instruction (SLI) is a document the shipper provides to their freight forwarder authorizing them to complete specific actions and providing all details required to arrange the export shipment, prepare documents, and file AES.
What an SLI Includes
- Shipper and consignee details
- Description, HTS/Schedule B number, and value of goods
- Instructions for bill of lading issuance (negotiable vs. express)
- Incoterms and freight payment instructions
- AES authorization and ECCN classification
- Notify party and special handling instructions
A complete and accurate SLI reduces documentation errors and ensures the forwarder has all information needed to complete the export.
For related logistics context, see glossary entries on AES Filing, Bill of Lading (BOL), Freight Forwarding, and Export Declaration.
