When You Need a CDL to Drive a Bus — and When You Don't

Most buses require a CDL, but school buses and some small shuttles do not

Whether you need a Commercial Driver's License (CDL) to drive a bus depends on the bus's Gross Vehicle Weight Rating (GVWR) and what passengers you're carrying. A bus with a GVWR over 26,001 pounds requires a CDL in every state. A bus under that weight limit may not require one — but if it carries 16 or more passengers (including the driver), you need a CDL regardless of weight. School buses are the main exception: they require a different credential called a School Bus Endorsement, not a standard CDL.

The rule is federal, so it applies the same way in all 50 states. But states differ in how they issue school bus credentials and what other endorsements or restrictions they add. If you're hired to drive a bus, your employer will tell you what license class they need you to hold — but knowing the rule yourself prevents confusion and helps you plan ahead.

Key Takeaways

Any bus over 26,001 pounds GVWR requires a CDL, regardless of passenger count.
Any bus carrying 16 or more passengers (including the driver) requires a CDL, even if it weighs less than 26,001 pounds.
School buses require a School Bus Endorsement, which is issued by your state's DMV but is not a CDL.
Transit buses, charter buses, and tour buses almost always require a CDL because they exceed the weight or passenger thresholds.
Your employer will specify which license class and endorsements the job requires before you are hired.

The weight and passenger rules that determine CDL requirement

The federal threshold is straightforward: if a bus has a GVWR over 26,001 pounds, the driver must hold a CDL. GVWR is the maximum weight the vehicle is designed to carry, including the bus itself, passengers, cargo, and fuel. You can find the GVWR on a label inside the driver's door frame or in the owner's manual. Most full-size transit buses, charter buses, and intercity buses exceed this weight by a large margin, so they require a CDL.

The passenger rule overrides the weight rule. If a bus is designed to carry 16 or more passengers (counting the driver as one of those passengers), a CDL is required even if the bus weighs less than 26,001 pounds. This catches smaller shuttle buses, minibuses, and van-based passenger carriers that might otherwise fall below the weight threshold. The key word is "designed" — the number of seats the bus has, not how many people you actually carry on a given day, determines whether the rule applies.

If a bus weighs under 26,001 pounds and is designed to carry 15 or fewer passengers, no CDL is required. This covers some small private shuttles, certain church buses, and some employee transport vans. However, many of these vehicles still require a commercial driver's license if they are used for business purposes — the distinction is between a CDL (which requires a commercial endorsement) and a regular driver's license used for commercial driving, which varies by state.

School buses and the School Bus Endorsement

School buses are exempt from the standard CDL requirement, but they are not exempt from licensing. Instead, drivers must obtain a School Bus Endorsement (often called an "S" endorsement) from their state's DMV. This endorsement is added to a regular driver's license, not a CDL. The endorsement requires passing a written test specific to school bus operation, including rules about passenger management, emergency procedures, and state-specific school bus laws.

Some states require a medical examination before issuing a School Bus Endorsement, and some require fingerprinting and a background check. Requirements vary by state, so contact your state's DMV or the school district hiring you to learn what your state requires. A few states also require a skills test (driving test) for the endorsement, though most do not.

School bus drivers are not required to hold a CDL, even though school buses often weigh well over 26,001 pounds. This is a federal exemption written into the CDL rules. However, if you drive a school bus and also want to drive other commercial vehicles (like a charter bus or delivery truck), you would need to obtain a separate CDL for those jobs.

Types of buses that require a CDL

Transit buses (city buses operated by public agencies) require a CDL. These buses typically weigh 25,000 to 40,000 pounds and carry 40 to 60 passengers, so they exceed both the weight and passenger thresholds. Drivers must hold a CDL with a Passenger (P) endorsement.

Charter and tour buses require a CDL with a Passenger endorsement. These buses are hired by groups or tour companies and carry passengers for a fee. They typically weigh 25,000 to 35,000 pounds and carry 40 to 55 passengers.

Intercity buses (like Greyhound or regional carriers) require a CDL with a Passenger endorsement. These are long-distance buses that carry passengers between cities and almost always exceed the weight and passenger thresholds.

Shuttle buses operated by hotels, airports, rental car companies, or employers may or may not require a CDL, depending on their weight and seating capacity. A shuttle designed to carry 16 or more passengers requires a CDL, even if it weighs under 26,001 pounds. Your employer will tell you which license is required.

What endorsements you need with a CDL for bus driving

If you hold a CDL and drive a bus, you must have a Passenger (P) endorsement on your CDL. This endorsement is separate from the CDL itself and requires passing an additional written test covering passenger safety, emergency procedures, and vehicle operation with passengers aboard. You cannot legally drive a bus for passenger transport with a CDL that does not have a P endorsement, even if you hold a valid CDL for other vehicle types.

Some bus drivers also hold an Air Brake Endorsement (marked "L" on the CDL). This is required if the bus is equipped with air brakes and you want to drive it. If you take your CDL skills test in a vehicle without air brakes, you will be restricted from driving air-brake vehicles unless you later pass an air brake test.

You may also need a Hazardous Materials (HazMat) endorsement if your job involves transporting hazardous materials. This is uncommon for passenger bus drivers but may explore if you drive a bus that also carries cargo or materials.

How to obtain a CDL or School Bus Endorsement

To obtain a CDL for bus driving, you must first hold a valid regular driver's license. Then you study for and pass a written test on general CDL knowledge, take a written test for the Passenger endorsement, and pass a skills test (pre-trip inspection, basic vehicle control, and on-road driving) in a bus. Most states require you to pass the written tests before scheduling the skills test. The entire process typically takes several weeks to a few months, depending on how quickly you schedule tests and how many attempts you need.

To obtain a School Bus Endorsement, you hold a regular driver's license and pass a written test specific to school bus operation. Some states require a medical examination and background check before you can take the test. Contact your state's DMV or the school district to learn the exact requirements in your state. The process is usually faster than obtaining a CDL because there is no skills test required in most states.

If you are hired by an employer, they may cover the cost of training and testing, or they may require you to obtain the license before you start. Ask during the hiring process what the employer expects and whether they offer training or reimbursement.

Frequently Asked Questions

Can I drive a small bus without a CDL?

Only if the bus weighs 26,001 pounds or less and is designed to carry 15 or fewer passengers. Most buses exceed one or both of these thresholds, so a CDL is required. Check the bus's GVWR and seating capacity to be sure, or ask your employer.

Do I need a CDL to drive a school bus?

No. School buses require a School Bus Endorsement on a regular driver's license, not a CDL. The endorsement is issued by your state's DMV and requires passing a written test. Requirements vary by state, so contact your state's DMV for details.

What is the difference between a Passenger endorsement and a School Bus Endorsement?

A Passenger (P) endorsement is added to a CDL and allows you to drive any bus carrying passengers for hire. A School Bus Endorsement is added to a regular driver's license and allows you to drive only school buses. They are separate credentials issued for different purposes.

If I have a CDL with a Passenger endorsement, can I drive a school bus?

No. A CDL with a Passenger endorsement does not replace a School Bus Endorsement. School bus driving requires the specific School Bus Endorsement on a regular driver's license. If you want to drive both buses and other passenger vehicles, you would need both credentials.

What happens if I drive a bus without the required license?

Driving without the required CDL or School Bus Endorsement is a violation of federal law and state law. Penalties include fines, license suspension, and possible criminal charges. Your employer is also liable. Always verify that you hold the correct license before accepting a bus driving job.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.