Standard Carrier Alpha Codes (SCAC) are short, unique two-to-four-letter identifiers used in logistics and transportation to consistently identify carriers and parties involved in moving goods. These codes support supply chain visibility, customs filings, tracking systems, and business reporting by providing a stable reference that does not change with company names or branding. This guide explains how SCAC codes work, where they appear in processes, how to verify them, and how to manage them for reliable, error-free shipments.
What SCAC codes are and why they matter
A SCAC is a two-to-four-letter code maintained by the National Motor Freight Traffic Association (NMFTA) to uniquely identify carriers, brokers, freight forwarders, and other entities in transportation and logistics. SCACs are used in electronic data interchange (EDI), bills of lading (BOL), customs forms (such as ACE filings for import into the United States), tracking systems, and settlement processes. Because a SCAC remains fixed even if a company rebrands or changes its legal name, it provides a reliable key for matching shipments, charges, and payments across systems and organizations.
For shippers, carriers, and brokers, understanding and using SCAC codes reduces manual entry errors, speeds audits, and improves automated workflows. For compliance and finance teams, SCACs help link invoices and payments to the correct carrier and are essential for traceability in regulated lanes. Because many transportation platforms and 3PL systems rely on SCACs for integrations, keeping them accurate is foundational to resilient operations.
Where SCAC codes appear in the supply chain
SCACs are used in several core logistics processes and documents. In ocean and air freight, they identify carriers on bills of lading and in customs filings such as the U.S. Customs and Border Protection (CBP) ACE. In road and intermodal transport, SCACs appear in EDI transactions (for example, in shipment notifications and status updates), freight invoices, and settlement files. TMS, WMS, and carrier contract systems often use SCACs to link tariffs, service levels, and performance metrics. During audits and payment runs, matching SCACs across documents helps ensure charges align with contracted services and that freight bills are accurate.
Key documents and systems where SCACs are used
- Bills of lading (BOL) and airway bills
- Customs filings, including import and export entries
- EDI transaction sets for shipment status and invoicing
- TMS and carrier contract management platforms
How SCAC codes are assigned and maintained
The NMFTA administers SCAC codes and maintains the official registry. Companies request codes by applying through NMFTA or via accredited providers, submitting basic details such as legal entity name, DUNS number, and operational type (carrier, broker, forwarder, or other). Once issued, a SCAC remains associated with the entity, even if the entity changes names, provided the NMFTA record is updated. It is important to verify a party’s current SCAC before automating workflows, especially after mergers, acquisitions, or rebranding, to avoid routing or settlement mismatches.
Optional: SCAC code attributes reference table
| Attribute | Verified Detail | Source Type |
|---|---|---|
| Code length | 2 to 4 letters | NMFTA SCAC standard |
| Issuer | NMFTA or accredited provider | NMFTA operations documentation |
| Typical use cases | Customs filings, EDI, invoicing, tracking | Industry practice and regulatory filings |
| Stability | Persistent across rebranding when records updated | NMFTA code maintenance policies |
How to find and verify SCAC codes
To locate a SCAC, check shipment documents, EDI messages, or the NMFTA public SCAC directory if available. Many carriers list their SCAC on invoices, onboarding portals, or their website. For audits and payment runs, compare the SCAC on the bill of lading with the one on the invoice and the carrier’s profile in your TMS or ERP. When engaging new carriers, validate the SCAC as part of onboarding to ensure system compatibility and accurate future transactions. If a name change or merger occurs, confirm with the carrier that their SCAC remains the same or that the NMFTA record has been updated accordingly.
Quick checks for SCAC accuracy
- Match SCAC across BOL, invoice, and EDI messages
- Confirm SCAC on the carrier’s contract and onboarding files
- Re-verify after mergers, acquisitions, or rebranding
- Store SCAC alongside DUNS and tax IDs in supplier records
Common issues and how to avoid them
Errors with SCACs typically arise from outdated records, typos in system configurations, or mismatched identifiers after a carrier changes its name or ownership. These issues can cause automated matching failures, delayed payments, or customs filing rejections. To reduce risk, centralize SCAC management in a supplier master data system, automate validation against EDI or customs messages, and set review reminders when companies announce reorganizations. Documenting exceptions and maintaining a change log also supports faster troubleshooting when discrepancies appear.
SCAC codes in international and domestic logistics
SCACs are widely used in North American freight, especially in road, intermodal, and rail movements, and they are referenced in U.S. customs processes through ACE. For imports into the United States, the carrier’s SCAC on the bill of lading must correspond with the filing and with the party registered in CBP. In international lanes, partners may use local identifiers in addition to SCACs; aligning both reduces manual reconciliation and supports smoother border handling. Even if you operate mainly outside the U.S., maintaining correct SCACs helps when you work with 3PLs or carriers that serve North American corridors.
Best practices for managing SCAC codes at scale
For organizations working with many carriers, a disciplined approach to SCAC management pays off. Maintain a single source of truth for each party that includes legal name, SCAC, DUNS, addresses, and service tiers, and link it to contracts and tariffs. Automate updates where possible through carrier onboarding portals and require SCAC verification during integration testing. Periodically run data-quality checks by comparing SCAC usage in EDI, invoices, and BOLs to master records. Establish a documented change process for mergers or rebranding so that SCACs and associated systems are updated in a coordinated way, minimizing disruption.
Key takeaways
- A SCAC is a stable, regulated identifier for logistics parties that supports automation and traceability.
- SCACs appear in BOLs, customs filings, EDI, TMS, and payment processes.
- Verify and maintain SCACs during onboarding and after corporate changes to prevent errors.
- Centralize SCAC and vendor data, automate validation, and schedule periodic reviews to keep records current.