The SICT permit (still commonly called the SCT permit) is a Mexican carrier's federal operating authority, tied to its RFC and specifying the service it may perform. Permit types differ, and border-zone versus nationwide scope determines which lanes an entity can legally run.
The SICT permit is Mexico's federal motor carrier operating authority, issued by the transport ministry (SICT, formerly and still colloquially SCT, so 'permiso SCT' persists in everyday speech). The permit ties to the carrier's RFC and defines what the holder may do: the class of service (general freight, specialized cargo such as hazmat, and other categories) and the operating scope, where the difference between border-zone authorization and nationwide federal highway authority does real work. Vehicles and their plates (placas federales) hang off this authority.
The permit is the Mexican leg's answer to the U.S. question 'does this carrier have authority for this move,' and it deserves the same seriousness. In vetting, verify three alignments: the permit belongs to the same RFC you are contracting, the service class covers the commodity (general freight authority does not cover hazmat), and the scope covers the geography, because a border-zone entity cannot legally run Bajío linehaul. That last check matters most with dual-entity carriers, where one entity may hold border-zone scope and another the interior authority; the entity quoted on your load must be the one whose permit covers the lane it will run. Ask for the permit alongside the constancia and insurance as part of the standard document set, and re-check on renewal cycles. Permits are unglamorous until the day an incident makes the coverage question urgent, and by then the answer is already fixed.
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