California is the state where “I bought a trip permit” most often turns out to mean the wrong permit. An out-of-state truck that is not apportioned for California and does not hold an IFTA license needs two separate credentials before it crosses: the DMV’s Nonresident Commercial Vehicle Trip Permit(form REG 41, $45, four consecutive days) for registration, and CDTFA’s California Fuel Trip Permit($30, up to four consecutive days) for fuel tax. Neither one is the $28 “One Trip Permit” that fills the search results, and neither one substitutes for the Motor Carrier Permit, CA number, or CARB reporting that California layers on top. This guide sorts out who needs what, from which agency, and what each costs.
Who Needs California Trip and Fuel Permits
The registration side is simple: if the truck carries IRP apportioned plates, its cab card is valid in California under the Full Reciprocity Plan and no trip permit is needed. If it is registered only in its home state — a straight-truck fleet that never crosses, a farm plate, a truck bought last week and not yet apportioned — it needs the REG 41 for every laden entry. The DMV will not issue a REG 41 to a vehicle based in California; a truck that is primarily dispatched, garaged, or maintained at a California address has to register.
The fuel side follows IFTA: a qualified motor vehicle (over 26,000 lbs, or three or more axles) with valid IFTA decals is covered. Without them, CDTFA requires a California Fuel Trip Permit for each qualified vehicle, completed prior to entering the state. CDTFA describes it as the way for out-of-state registered owners to enter and travel in California for four consecutive days without obtaining a license — and, in the other direction, the way a California-based carrier re-enters after out-of-state travel without fuel-tax licensing.
Three Agencies, Three Jobs
California splits commercial-vehicle credentials across the DMV, the Department of Tax and Fee Administration, and the Highway Patrol, with the Air Resources Board added for emissions. Knowing which office owns which document is half the work.
| Agency | Credential | What it covers | Fee / window |
|---|---|---|---|
| DMV | Nonresident Commercial Vehicle Trip Permit (REG 41) | Registration for a laden out-of-state commercial vehicle not apportioned for California | $45; 4 consecutive days from first use |
| CDTFA | California Fuel Trip Permit (CFTP) | Fuel tax for a qualified motor vehicle without IFTA (or Interstate User) credentials | $30 per vehicle; specific dates, up to 4 consecutive days |
| DMV | Motor Carrier Permit (MCP) | Operating credential for motor carriers of property running commercial motor vehicles on California highways (CVC 34620) | Fee by operation type and power units; verify with DMV |
| CHP | Carrier Identification (CA) number | Prerequisite for the MCP; displayed on both sides of the power unit | Issued by CHP; verify current process |
| CARB | Clean Truck Check (CTC-VIS reporting) | Emissions compliance for non-gasoline vehicles over 14,000 lbs GVWR operating in California, including out-of-state trucks | Annual compliance fee, initially $30 per vehicle, CPI-adjusted; periodic testing |
The DMV Nonresident Commercial Vehicle Trip Permit (REG 41)
The REG 41 is listed at $45 on the DMV registration fee schedule. DMV’s own summary of the permit (Fast Facts 36) sets the rules: it may be issued to a commercial vehicle that complies with the registration requirements of a state California has reciprocity with; the operator completes and dates it before use; it is valid for four consecutive days, starting on the day of first use; it allows the vehicle to be operated laden within or outside California, interstate or intrastate; it cannot be issued to a California-based vehicle; and it cannot be used for a vehicle last registered in Mexico. It is a two-part form that can be bought in volume, which is why permit services keep stock. If the vehicle runs on any fuel other than gasoline, the REG 41 requires a CDTFA California Fuel Trip Permit, and the fuel permit number is written onto the REG 41 and carried with it.
Where to buy: DMV field offices and permit services. If you are counting on a self-serve online purchase of the REG 41 itself, confirm that with DMV first — the fuel permit is the one CDTFA clearly sells online.
The CDTFA California Fuel Trip Permit
CDTFA’s fuel trip permit page is unusually direct. There is a $30 fee for each permit. You must purchase one for each qualified motor vehicle and complete it prior to entering California. It is issued for specific dates, for up to four consecutive days, and it is not valid before or after the dates specified. You can buy it through CDTFA’s online services, in person at the Motor Carrier Office or any CDTFA office, or at most DMV offices.
The penalty language is worth reading before you decide to chance it. Operating without a license or fuel trip permit draws a penalty of $100 to $500, higher if fuel tax is owed, and CDTFA can seize the vehicle and hold it until taxes, penalties, interest, and storage costs are paid. Because the permit is date-specific, there is no fixing it at the scale.
Why the “One Trip Permit” Is the Wrong Search
The DMV also sells a One Trip Permit (REG 402) for $28, and it dominates the search results for “California trip permit.” It is a different instrument. Under CVC 4003 it lets a vehicle that is required to be registered move unladenon one continuous trip — into, out of, or across California by the most direct route — or serve as a parade float. It cannot be used to move a crane or trailer coach owned by a California resident. A loaded commercial truck on a One Trip Permit is not registered for that trip. The commercial credential is the REG 41, and if you see “one trip permit” on an invoice for a laden run, ask which form number was issued.
The California-Specific Gotchas: MCP, CA Number, Clean Truck Check
California Vehicle Code 34620 says a motor carrier of property shall not operate a commercial motor vehicle on any public highway in the state unless it has a carrier identification number under CVC 34507.5 registered with DMV and holds a valid Motor Carrier Permit. The statute does not exempt interstate carriers, and DMV’s MCP page counts for-hire property carriers “regardless of vehicle size, type, or weight” and operators of vehicles of 10,001 lbs GVWR or more among those who need one. The CA number comes from CHP first; the MCP fee depends on operation type and the number of power units. Our California state page covers the CA number and MCP filing itself; the point here is that a trip permit and a fuel permit do not stand in for either one.
The third layer is emissions. CARB’s Clean Truck Check applies to nearly all diesel and alternative-fuel heavy-duty vehicles with a GVWR over 14,000 lbs operating on California roads, wherever they are registered. Owners report the vehicle in CTC-VIS, pay an annual compliance fee (set at $30 per vehicle initially and adjusted with the California CPI), and submit periodic emissions tests; CARB and CHP enforce at border crossings, ports, and by roadside monitoring. Verify the current testing cadence with CARB’s Clean Truck Check FAQ before the trip — an out-of-state truck that has never been reported is the easy roadside catch.
When Apportioned Plates and IFTA Make the Permits Unnecessary
A truck with a current IRP cab card and IFTA decals skips both temporary permits entirely; that is the point of both programs. It still needs the CA number, the MCP, and Clean Truck Check compliance, and if the load is over legal weight or dimensions it still needs a Caltrans transportation permit — see the OS/OW permits by state guide. If California is a once-a-year run, the two trip permits are the cheaper path; if it is a lane, the trip permit vs annual permit break-even says apportion and enroll in IFTA.
Cost and Filing
For one non-apportioned, non-IFTA diesel truck, a four-day California entry is $75 in state fees: $45 for the REG 41 and $30 for the fuel trip permit. Both are per vehicle, and both must be in hand before the state line. We file each one directly with the issuing agency for $75 flat per permit; the CA number and Motor Carrier Permit are handled separately through the California page. The trip and fuel permits by state table has the same breakdown for the states on either side of the trip.