What is the difference between a trip permit and a fuel permit?
A trip permit is a per-trip operating permit covering registration, weight, or route — it lets a vehicle legally make a specific journey. A fuel permit is a separate permit covering motor-fuel tax obligations (IFTA equivalent for non-IFTA-registered carriers). Both can be needed for the same trip; they cover different regulatory layers.
Trip permits cover state operating-authority equivalents — temporary registration for a vehicle without IRP plates, oversize/overweight permits for permitted loads, or temporary route authority where required. They are issued by state DOTs and expire at the end of the trip.
Fuel permits cover state motor-fuel tax. A non-IFTA carrier (or an IFTA carrier with an expired or suspended account) needs a per-state fuel permit for every state of operation on the trip. The permit attests to fuel-tax payment for the miles run in that state.
For a single trip through a non-IFTA-registered state, the carrier may need both: a trip permit (for registration or weight) AND a fuel permit (for fuel tax). The two permits are issued by separate state offices and have separate fee schedules — neither one substitutes for the other.
Carriers operating regularly should normally hold IRP and IFTA accounts to avoid trip-by-trip permitting. The trip-permit path is the right call for occasional one-off moves outside the normal IFTA/IRP footprint or for carriers in their first few weeks before account activation.