Shipper’s Letter of Instruction (SLI)
A Shipper’s Letter of Instruction (SLI) is a key document used in international shipping. It is issued by the exporter (the shipper) and provides clear written instructions to the freight forwarder or carrier responsible for moving the goods. The SLI outlines how the cargo should be handled, transported, and documented. It serves as both an authorisation and a guide, helping ensure that all parties involved follow the correct process.
The shipper is responsible for preparing and submitting the SLI. This responsibility includes providing accurate information about the shipment, including commercial, logistical, and regulatory details. The freight forwarder then uses the SLI to complete the necessary export documentation, book transport, and submit customs declarations where required.
Table of Contents
Purpose of the Shipper’s Letter of Instruction
The SLI helps bridge the communication gap between the exporter and the freight forwarder. It ensures that:
- Goods are shipped according to the exporter’s preferences and requirements
- All parties understand their roles and responsibilities
- Errors, delays, and compliance issues are minimised
By using an SLI, exporters retain control over how their goods are managed during export, while freight forwarders gain the information needed to act efficiently and legally on their behalf.
What the Shipper’s Letter of Instruction Includes
A typical Shipper’s Letter of Instruction contains:
- Shipper’s and consignee’s contact details
- Description of goods being exported (including weight, dimensions, and packaging type)
- Incoterms (e.g. FOB, CIF) indicating the terms of delivery
- Export licence or authorisation details (if applicable)
- Instructions for freight booking and routing
- Details of the mode of transport (air, sea, road, or rail)
- Customs information and commodity codes
- Insurance requirements
- Authorisation for the forwarder to sign export documentation on the shipper’s behalf
Accurate completion of the SLI is crucial, as incorrect or missing information can lead to delays, penalties, or non-compliance with export laws.
Who Is Responsible?
The exporter (shipper) is legally and operationally responsible for providing the Shipper’s Letter of Instruction. This includes:
- Supplying complete and accurate data about the goods and destination
- Ensuring the instructions comply with export regulations
- Confirming that the forwarder is authorised to act on their behalf
The freight forwarder is responsible for carrying out the instructions within the SLI. This may include:
- Booking cargo space with carriers
- Preparing transport and customs documents
- Filing export declarations
- Coordinating logistics from the point of origin to final delivery
The SLI allows the forwarder to act as the shipper’s agent, but only within the scope of the instructions provided.
At Barrington Freight, we specialise in making your importing and exporting straightforward. From customs clearance to finding the right commodity codes, our expert team is here to assist. Don’t let the complexities of global trade hold you back. Reach out to Barrington Freight for efficient and reliable shipping solutions.
Is the SLI Legally Required?
The Shipper’s Letter of Instruction is not a legal requirement in all cases, but it is considered industry best practice. Many freight forwarders will request one before handling a shipment. When goods are being exported from the UK under a formal customs declaration, the SLI is often used to document the shipper’s consent for the forwarder to submit declarations on their behalf.
Using an SLI also provides a paper trail that can help resolve disputes, confirm responsibilities, and support compliance audits.
Benefits of Using a Shipper’s Letter of Instruction
- Provides clear direction for freight forwarders
- Helps avoid misunderstandings or incorrect shipments
- Supports customs compliance
- Streamlines the export process
- Protects the shipper by documenting authorisation and terms
Final Notes
To complete a Shipper’s Letter of Instruction accurately, exporters should use a clear and structured template and verify all information before submission. The SLI should be signed and dated by an authorised person within the exporting company.
For a detailed walkthrough of how to complete an SLI, visit: How to Complete a Shipper’s Letter of Instruction.
About the Author
Simon Poole began his career in production planning, quickly rising to manage 24-hour manufacturing lines and oversee a team of 140 staff. In 2007, he joined Barrington Freight, where he brought his operational expertise into the logistics sector. Appointed Operations Director in 2021, Simon now leads all day-to-day operations, including sea, air and European freight, working closely with clients and partners worldwide.
We’re friendly, easy to work with, honest and we don’t charge the earth.
For advice and information on shipping time from China to the UK, call 01268 525444 or email us today.
