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What is the Difference Between a Class A and Class B CDL?

By Sarah Martinez4 min read
CDL TypesCareer GrowthGetting Started
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What is the Difference Between a Class A and Class B CDL?

When you decide to pursue a career in commercial driving, one of the first decisions you must make is which type of license to apply for. The Commercial Driver's License (CDL) system is divided into classes based on the weight and type of the vehicle you intend to operate.

The two most common licenses are the Class A CDL and the Class B CDL. While both open doors to excellent careers, they dictate very different types of driving jobs and earning potentials. Here is a clear breakdown of the differences between the two.

The Defining Factor: Gross Combination Weight Rating (GCWR)

The legal difference between the two classes comes down to the weight of the vehicle and, most importantly, the weight of the trailer it is towing.

The FMCSA uses the Gross Combination Weight Rating (GCWR) to classify vehicles. This is the maximum allowable combined weight of the truck, the trailer, and the cargo.

The Class A CDL

A Class A CDL is required to operate any combination of vehicles with a GCWR of 26,001 pounds or more, provided the towed vehicle (the trailer) weighs MORE than 10,000 pounds.

Vehicles you can drive with a Class A:

  • Tractor-trailers (Semi-trucks, 18-wheelers)
  • Truck and trailer combinations (e.g., a heavy-duty pickup towing a large equipment trailer)
  • Tanker vehicles
  • Flatbeds
  • Livestock carriers

The Hierarchy Rule: The Class A is the highest level of commercial license. A massive advantage of holding a Class A CDL is that it generally permits you to drive any Class B or Class C commercial vehicle as well (provided you hold the appropriate endorsements, like passenger or school bus).

The Class B CDL

A Class B CDL is required to operate a single vehicle with a Gross Vehicle Weight Rating (GVWR) of 26,001 pounds or more, OR any such vehicle towing a trailer that weighs 10,000 pounds or LESS.

Vehicles you can drive with a Class B:

  • Straight trucks (Box trucks, delivery trucks)
  • Large passenger buses (City transit, tour buses)
  • Segmented buses
  • Dump trucks
  • Concrete mixers
  • Garbage and sanitation trucks

Notice that a Class B allows you to drive very heavy vehicles, but it restricts you from towing heavy trailers.

Career Opportunities and Lifestyle Differences

The type of license you choose will directly impact your day-to-day life and your earning potential.

Life with a Class A CDL

A Class A CDL is the ticket to the quintessential "trucker" lifestyle. It is heavily associated with Over-The-Road (OTR) and regional driving, where you may be away from home for days or weeks at a time. Because hauling 53-foot trailers across the country requires more advanced skill and lifestyle sacrifices, Class A drivers typically earn significantly higher salaries than Class B drivers. The job market for Class A drivers is vast, with massive national carriers constantly hiring.

Life with a Class B CDL

Class B jobs are almost exclusively local. If you drive a box truck, a dump truck, or a city bus, your route is confined to a specific city or region. This means Class B drivers are almost always home every single night. The hours are often more predictable, resembling a standard shift. However, because the vehicles are generally easier to maneuver and the lifestyle is less demanding, the earning ceiling for a Class B driver is usually lower than that of a Class A driver.

Which Should You Choose?

If your priority is being home every evening with your family and you don't mind a slightly lower earning cap, a Class B CDL is an excellent choice, particularly in construction and local delivery.

However, if you want maximum earning potential, the freedom to travel the country, and the ultimate versatility in the job market, the Class A CDL is the undisputed king. Because a Class A allows you to drive Class B vehicles anyway, many students opt to get their Class A training right from the start so they never have to return to school to upgrade their license later.

At TDSA, we offer comprehensive training for both classes, ensuring you get exactly the license you need to reach your specific career goals.

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