Class B CDL Weight Limit: GVWR, Vehicles, and Requirements

The Class B CDL weight limit starts at a gross vehicle weight rating (GVWR) of 26,001 pounds. Any single vehicle at or above that rating falls into Class B, and you can tow a trailer with it only if the trailer’s GVWR is 10,000 pounds or less.¹ The number that matters is the manufacturer’s rating, not what the truck actually weighs on a given day.

Why GVWR Controls, Not Scale Weight

GVWR is the maximum total weight the vehicle is designed to handle: frame, engine, fuel, passengers, and cargo combined. That rating is set by the manufacturer and stays fixed for the life of the vehicle. An empty dump truck rated at 33,000 pounds still requires a Class B CDL even if it rolls onto a scale at 18,000 pounds with nothing in the bed. The rating is what puts it in the class, not the load.

You can find the GVWR on a label inside the driver’s door frame or in the manufacturer’s paperwork. If that number is 26,001 pounds or higher and the vehicle isn’t pulling a trailer rated above 10,000 pounds, it’s a Class B vehicle.¹

How Class B Compares to Class A and Class C

Federal rules divide commercial vehicles into three groups by weight and configuration. Knowing where Class B ends matters, because getting the wrong class doesn’t just limit your job options, it exposes you to disqualification if you drive above your class.

Class A covers combination vehicles with a gross combination weight rating of 26,001 pounds or more where the towed unit is rated above 10,000 pounds. This is the tractor-trailer license.
Class B covers any single vehicle rated at 26,001 pounds or more, with or without a trailer rated 10,000 pounds or less.
Class C covers anything that doesn’t hit Class A or B weight but is either designed to carry 16 or more people (driver included) or is used to haul hazardous materials.¹

A Class B license lets you drive Class C vehicles too, as long as you carry the right endorsements for the passengers or cargo.¹ It does not let you drive a Class A combination. If a job puts you behind a heavy trailer over 10,000 pounds GVWR, you need to upgrade to Class A.

Vehicles That Fall Under Class B

Straight trucks used for local deliveries and moving jobs are the most common Class B vehicles. These are box trucks and freight trucks where the cargo body sits permanently on the same frame as the cab. Many of them carry GVWRs well above 26,001 pounds.

Transit buses, school buses, and tour coaches also land in Class B when they run as single vehicles in that weight range. Dump trucks, garbage trucks, and cement mixers fill out the category. Before assuming a utility or construction truck can be driven on a regular license, check the door sticker.

What It Takes To Get a Class B CDL

Age

You must be 21 to drive a commercial motor vehicle in interstate commerce.² Most states let drivers as young as 18 hold a CDL for intrastate routes only. FMCSA ran a pilot program that let some under-21 drivers cross state lines, but that program ended in November 2025.³ The 21-year floor for interstate work remains in place.

Medical Certification

Every CDL holder needs a current medical examiner’s certificate from a provider on the FMCSA National Registry. The standard certificate is good for two years, though drivers with conditions such as high blood pressure or diabetes may only receive a one-year card.⁴ The exam screens for issues that could cause sudden incapacitation behind the wheel, along with vision and hearing thresholds set by federal rule.⁵

Entry-Level Driver Training

Since February 7, 2022, first-time Class B applicants must complete Entry-Level Driver Training (ELDT) through a provider listed on the FMCSA Training Provider Registry.⁶ ELDT covers classroom theory and behind-the-wheel instruction. The provider reports your completion to the registry, and your state checks that record before issuing the license. The same requirement applies when upgrading from Class B to Class A, or when adding a passenger, school bus, or hazmat endorsement for the first time.

Commercial Learner’s Permit

Before the skills test, you need a Commercial Learner’s Permit (CLP), which you get by passing the written knowledge test at your state licensing office. A CLP is valid for up to one year from issuance.⁷ While driving on a CLP, a licensed CDL holder with the matching class and endorsements must sit in the front passenger seat and supervise you directly.⁸ You can’t carry passengers or haul hazardous materials on a CLP.

Endorsements That Expand What You Can Drive

A base Class B lets you drive the vehicle itself, but specific cargo and passenger operations require separate endorsements. Each one adds a knowledge test, and some add a skills test on top.

Passenger (P) is required to drive a vehicle designed for 16 or more people including the driver, and it takes both a knowledge and skills test.⁹
School Bus (S) sits on top of the Passenger endorsement and has its own knowledge and skills test.⁹
Tank Vehicle (N) applies to liquids or gases carried in a tank with an individual capacity over 119 gallons and an aggregate capacity of 1,000 gallons or more. Knowledge test only.¹⁰
Hazardous Materials (H) requires the knowledge test plus a TSA security threat assessment with fingerprinting and background check, renewed every five years.¹¹

Restrictions That Narrow What You Can Drive

Restrictions work the other direction. They limit your license based on what you tested in.

The air brake restriction (L) shows up on your CDL if you take the skills test in a vehicle without air brakes or fail the air brake portion of the knowledge test. With that restriction, you can’t operate any vehicle equipped with air brakes. Most Class B trucks and buses use air brakes, so this restriction closes off a large share of Class B jobs. Testing in an air-brake vehicle from the start avoids the problem.¹⁰

The manual transmission restriction (E) lands on your license if you test in an automatic. To remove it later, you take a skills test in a manual-transmission vehicle; you don’t have to redo ELDT.¹²

Penalties for Driving Above Your Class

Driving a commercial vehicle without the right class or endorsements is a serious violation under federal rules. A second conviction within three years brings a 60-day disqualification from operating any commercial vehicle. A third or later conviction inside that same three-year window stretches the disqualification to 120 days.¹³ Driving on a suspended or revoked CDL is worse: a first offense carries a one-year disqualification, and a second offense means three years off the road.

What It Costs

CDL costs vary widely by state. Government fees for the full process, covering the learner’s permit, skills test, and license issuance, run roughly $30 to $350 depending on where you apply. Some states bundle everything into one fee; others charge separately at each step. A CDL school to satisfy the ELDT requirement typically costs $3,000 to $10,000 or more, which dwarfs the licensing fees themselves. Trucking companies and public transit agencies sometimes sponsor training in exchange for a work commitment, so ask before paying out of pocket.

1
eCFR. 49 CFR 383.91 – Commercial Motor Vehicle Groups
2
eCFR. 49 CFR 391.11 – General Qualifications of Drivers
3
Federal Motor Carrier Safety Administration. Safe Driver Apprenticeship Pilot (SDAP) Program
4
Federal Motor Carrier Safety Administration. For How Long Is My Medical Certificate Valid?
5
eCFR. 49 CFR Part 391 Subpart E – Physical Qualifications and Examinations
6
Federal Motor Carrier Safety Administration. Entry-Level Driver Training (ELDT)
7
eCFR. 49 CFR 383.73 – State Procedures
8
eCFR. 49 CFR 383.25 – Commercial Learner’s Permit (CLP)
9
eCFR. 49 CFR 383.93 – Endorsements
10
eCFR. 49 CFR Part 383 – Commercial Driver’s License Standards; Requirements and Penalties
11
Transportation Security Administration. HAZMAT Endorsement
12
Training Provider Registry. Frequently Asked Questions
13
eCFR. 49 CFR 383.51 – Disqualification of Drivers