What the P and S Endorsements Mean on Your CDL

The P and S endorsements let you drive passenger buses and school buses

The P endorsement (passenger) allows you to operate any bus designed to carry more than 15 passengers, including intercity buses, tour buses, and shuttle services. The S endorsement (school bus) allows you to operate a school bus that carries students. You cannot legally drive either type of bus without the matching endorsement on your CDL, even if you hold a valid commercial license.

These are separate endorsements because school buses have different rules, training requirements, and safety standards than other passenger buses. You can hold one, both, or neither — it depends on what type of work you want to do. Many drivers who work for school districts get both P and S, while others who drive tour buses may only need P.

Both endorsements require you to pass a written knowledge test specific to that endorsement, in addition to the general CDL written test and the road test you already took or will take. The tests cover vehicle operation, passenger safety, emergency procedures, and the laws that explore to each type of bus.

Key Takeaways

• The P endorsement covers any bus with more than 15 passengers; the S endorsement covers school buses specifically.
• You must pass a separate written test for each endorsement you want, covering passenger safety and emergency procedures.
• School buses require the S endorsement and have additional rules about student supervision and vehicle inspections.
• You can add these endorsements to an existing CDL or include them when you first test for your commercial license.
• Some states require a medical certificate or background check before you can hold an S endorsement.

What the P endorsement covers

The P endorsement covers any bus designed to carry 16 or more passengers (including the driver). This includes charter buses, tour buses, intercity coaches, shuttle buses for hotels or airports, and any other commercial passenger vehicle in that size range. If you drive a 15-passenger van, you do not need P — the line is at 16 or more.

To get the P endorsement, you must pass the Passenger (P) knowledge test. The test covers safe passenger loading and unloading, how to handle emergencies like fires or medical situations, how to communicate with passengers, and the rules about where passengers can and cannot sit. You also need to demonstrate on your road test that you can operate a passenger bus safely — the examiner will watch how you handle turns, braking, mirror checks, and passenger safety.

The P endorsement does not expire separately from your CDL. It renews when your license renews, though some states require you to pass the knowledge test again at renewal.

What the S endorsement covers

The S endorsement is specifically for school buses. You need it to transport students to and from school, to field trips, or to school-sponsored events. The S endorsement has stricter requirements than P because you are responsible for minors and must follow federal and state school transportation laws.

To get the S endorsement, you must pass the School Bus (S) knowledge test, which covers student management, emergency evacuation procedures, how to operate the stop-arm and warning lights, how to inspect a school bus before driving, and the rules about where students can sit. Many states also require a background check and a medical certificate before issuing S. Some states require fingerprinting or a check of your driving record for violations involving students or safety.

School buses have equipment that other buses do not — a stop-arm that extends when the door opens, red warning lights, and specific seating rules. The S test covers how to use this equipment correctly and what to do if it fails. You will also learn about your legal duty to report suspected child abuse and how to handle medical emergencies with students on board.

How to add P or S to your existing CDL

If you already hold a CDL, you can add P or S (or both) without retesting for your general CDL. You go to your state's DMV or licensing office, pay the endorsement fee, and take the written test for the endorsement you want. Some states let you take the test at the same visit; others schedule it separately.

You do not need to take the road test again unless your state requires it for that specific endorsement. Most states do not require a new road test when adding P or S to an existing CDL, but a few do — check with your state's licensing office before you go.

The fee for each endorsement varies by state, typically ranging from $10 to $50 per endorsement. The written test usually costs nothing extra if you are testing at the DMV, though some private testing centers may charge a small fee.

Getting P and S when you first test for your CDL

You can include P and/or S endorsements when you take your initial CDL tests, rather than adding them later. If you plan to drive a passenger bus or school bus from the start, this is often faster than getting your base CDL first and then coming back for endorsements.

You will take the general CDL knowledge test plus the P test, the S test, or both — whichever endorsements you want. You will also take one road test, but the examiner will test you in the type of vehicle that matches your endorsement. If you are testing for S, you test in a school bus; if you are testing for P, you test in a passenger bus.

This approach requires more study upfront because you are covering more material, but it means you walk out with everything you need on one license instead of making multiple trips to the DMV.

Differences between P and S requirements by state

Every state requires the P and S knowledge tests, but the details vary. Some states require a medical examination before issuing S (a few require it for P as well). Some states require a background check or fingerprinting for S. A handful of states require you to pass the S road test in an actual school bus; others let you test in any large bus and then issue S once you pass.

A few states have additional endorsements or restrictions related to passenger transport — for example, some have a separate endorsement for transporting hazardous materials on a bus, or rules about the number of hours you can drive with passengers. Check your state's CDL handbook or contact your state's licensing office to learn what applies where you live.

If you are moving to a new state with an existing P or S endorsement, your license will transfer, but some states may require you to pass their version of the test or meet their specific requirements (like a medical exam) before they will recognize the endorsement.

When you might need both P and S

Many school bus drivers hold both endorsements because school districts sometimes ask drivers to cover other routes or fill in for absent drivers. If you have both P and S, you can legally drive a school bus, a charter bus, or any other passenger bus — you are not limited to one type of work.

Some drivers get P first (for tour or charter work) and add S later when they move into school transportation. Others get S first and add P if they want more job options. There is no rule that says you must have both; it depends on what work you are looking for and what your employer requires.

If you hold both endorsements, you still renew them together with your CDL. You do not manage them separately or pay separate renewal fees for each one — they are all part of your single license.

Frequently Asked Questions

Do I need a P endorsement to drive a 15-passenger van?

No. The P endorsement applies to buses designed to carry 16 or more passengers. A 15-passenger van (including the driver) does not require P. However, check your state's rules — a few states have different thresholds or classify certain vans differently.

Can I get the S endorsement if I have a criminal record?

It depends on the crime and your state's rules. Most states conduct a background check before issuing S because you will work with minors. Felonies, crimes involving violence or drugs, or crimes against children usually disqualify you. Misdemeanors may or may not, depending on the offense and how long ago it occurred. Contact your state's licensing office or school district to learn what disqualifies you.

What happens if I drive a school bus without the S endorsement?

You are breaking the law. Driving without the required endorsement is a violation that can result in a fine, points on your license, or suspension of your CDL. Your employer can also be fined. Always make sure your endorsements match the work you are doing.

Do I have to renew my P and S endorsements separately from my CDL?

No. Your P and S endorsements renew at the same time as your CDL. However, some states require you to pass the knowledge test again at renewal, while others do not. Check your state's renewal rules when your license is about to expire.

Can I add P or S if I have medical conditions?

You must meet the federal medical standards for a CDL, which explore to all endorsements. Some states require an additional medical exam for S specifically. If you have a condition that affects your ability to drive safely (vision problems, hearing loss, seizure disorders, or certain medications), you may need a medical certificate or waiver. Discuss any health concerns with your doctor and your state's licensing office before testing.