Commercial licenses are classified by the weight and type of vehicle you operate, not by what you carry or who pays you
A commercial driver's license (CDL) is sorted into three classes — A, B, and C — based on the vehicle's gross vehicle weight rating (GVWR), not the cargo inside or your employer. Class A covers the heaviest trucks, Class B covers medium trucks and buses, and Class C covers smaller commercial vehicles. The class you need depends entirely on what you're driving, and driving something heavier than your license allows is a violation that can result in fines and suspension.
The GVWR is the maximum weight a vehicle can safely carry when fully loaded, including passengers, cargo, and fuel. You'll find this number on a label inside the driver's door jamb or in the owner's manual. If you're unsure whether a vehicle falls into a particular class, the GVWR is the number that settles it — not the actual weight on any given day.
Key Takeaways
- Class A CDLs are required for vehicles with a GVWR of 26,001 pounds or more, including most tractor-trailers and large combination vehicles.
- Class B CDLs cover single vehicles with a GVWR between 26,001 and 33,000 pounds, such as straight trucks and large buses.
- Class C CDLs are for smaller commercial vehicles under 26,001 pounds GVWR that transport hazardous materials or 16 or more passengers.
- Your state's Department of Motor Vehicles (DMV) or equivalent agency determines which class you need based on the vehicle's specifications, not your job title.
- Driving a vehicle heavier than your license class permits is illegal in all states and carries fines, points, and potential license suspension.
Class A: Heavy Trucks and Tractor-Trailers
A Class A CDL is required to operate any combination of vehicles with a GVWR of 26,001 pounds or more, where the towed unit weighs more than 10,000 pounds. This includes tractor-trailers, doubles (two trailers), and triples (three trailers). Most long-haul trucking jobs require a Class A license.
Class A is the most restrictive and requires the most training. You must pass a written knowledge test specific to combination vehicles, a pre-trip inspection test, and a road skills test in a vehicle that matches the class. Many states require 160 hours or more of behind-the-wheel training before you can test for Class A.
Class B: Straight Trucks and Large Buses
A Class B CDL covers single vehicles (not combinations) with a GVWR of 26,001 pounds or more. This includes straight trucks used in construction, delivery, or waste management, as well as buses that carry passengers. School buses, city transit buses, and charter buses typically fall into this category.
Class B testing is similar to Class A — you'll take a written test, a pre-trip inspection test, and a road test — but the vehicle you test in is a single unit rather than a combination. The written exam covers topics specific to the vehicle type you'll be driving, such as passenger safety if you're driving a bus.
Class C: Small Commercial Vehicles with Restrictions
A Class C CDL is required for vehicles under 26,001 pounds GVWR that either carry hazardous materials or transport 16 or more passengers (including the driver). A small shuttle van carrying 15 passengers does not need a CDL. A small van carrying 16 passengers does. A pickup truck hauling propane or other hazardous materials needs a Class C, even if it weighs only 10,000 pounds.
Class C testing is less extensive than Class A or B. You take a written knowledge test and a pre-trip inspection test, but many states do not require a full road skills test for Class C. The written exam focuses on the specific hazard or passenger safety rules that explore to your vehicle.
Endorsements and Restrictions That Modify Your Class
Your CDL class can be modified by endorsements (additional qualifications) and restrictions (limitations on what you can drive). An endorsement adds permission — for example, the H endorsement allows you to haul hazardous materials. A restriction removes permission — for example, the "automatic transmission only" restriction means you can only drive vehicles with automatic transmissions.
Endorsements require additional written tests and sometimes additional skills tests. Restrictions are usually imposed if you fail part of the road test or if you have a medical condition that limits your driving. Your license document will list your class, endorsements, and restrictions clearly.
How to Determine Your Vehicle's Class
Start with the GVWR. Look for the label on the driver's side door jamb, in the owner's manual, or on the manufacturer's plate. Write down the number. Then check whether the vehicle is a single unit or a combination (towing something heavier than 10,000 pounds). Use the table below to find your class.
| Vehicle Type | GVWR | Required Class |
|---|---|---|
| Tractor-trailer, doubles, triples | 26,001+ pounds | Class A |
| Straight truck, large bus | 26,001+ pounds | Class B |
| Small vehicle hauling hazmat | Under 26,001 pounds | Class C |
| Small vehicle carrying 16+ passengers | Under 26,001 pounds | Class C |
| Vehicle under 26,001 pounds, no hazmat, under 16 passengers | Under 26,001 pounds | Regular driver's license (not CDL) |
If you're unsure, contact your state's DMV or the company that owns the vehicle. They can confirm the GVWR and tell you which class is required. Guessing wrong and driving without the correct class is a violation in every state.
Frequently Asked Questions
Can I drive a Class B vehicle with a Class A license?
Yes. A Class A license allows you to drive any commercial vehicle, including Class B and Class C vehicles. The hierarchy goes A (most restrictive) down to C (least restrictive). You cannot drive up — a Class B license does not allow you to drive Class A vehicles.
Do I need a CDL to drive a pickup truck for work?
Not unless the pickup's GVWR is 26,001 pounds or more, or you're hauling hazardous materials, or you're carrying 16 or more passengers. Most pickup trucks have a GVWR under 14,000 pounds and can be driven with a regular driver's license for work purposes.
What happens if I drive a vehicle that's heavier than my license class?
You can be cited for operating a commercial vehicle without the proper class of license. Penalties vary by state but typically include fines of $100 to $500, points on your driving record, and possible license suspension. Your employer can also be fined.
Does my job title determine my license class?
No. Your license class is determined by the vehicle's GVWR and type, not your job or employer. A person driving a delivery truck needs the class that matches the truck's weight, regardless of whether they work for a small business or a large corporation.
Can I switch between Class A and Class B without retesting?
If you hold a Class A license, you can drive Class B and Class C vehicles without additional testing. If you hold a Class B license and want to drive Class A vehicles, you must pass the Class A road test. Downgrading from A to B does not require a test.