Commercial Driver’s License: Classes, Requirements, and Endorsements

To get a commercial driver’s license, you have to be old enough for the type of driving you plan to do, hold a valid regular license, pass a Department of Transportation physical, complete federally required entry-level training, and pass both knowledge and skills tests through your state’s licensing agency. The commercial driver’s license requirements are set at the federal level by the Federal Motor Carrier Safety Administration (FMCSA), and states handle the actual issuance, so the standards below apply everywhere, though your state may add to them.

Who Actually Needs a CDL

Federal rules tie the CDL requirement to three triggers. You need one if the vehicle or vehicle combination you drive has a gross vehicle weight rating of 26,001 pounds or more, if it’s designed to carry 16 or more passengers including the driver, or if it’s used to transport hazardous materials in quantities requiring placards.¹

The weight threshold catches some drivers off guard. A loaded moving truck or a delivery vehicle doesn’t have to look enormous to cross 26,001 pounds. The rule applies whether commercial driving is your full-time job or something you do occasionally.

The Three CDL Classes

Your class depends on the vehicle you’ll drive.

Class A covers combination vehicles rated at 26,001 pounds or more where the towed unit is over 10,000 pounds. Tractor-trailers, flatbeds, and tankers fall here.
Class B covers single vehicles rated at 26,001 pounds or more, or such a vehicle towing a unit not over 10,000 pounds. Straight trucks, large buses, and dump trucks fit this class.
Class C covers vehicles that don’t meet the Class A or B weight thresholds but are designed to carry 16 or more passengers or to transport placarded hazardous materials.

A Class A license also lets you operate Class B and C vehicles; a Class B covers Class C. Class A skills testing is the most demanding because it includes coupling and uncoupling.¹

Age, Residency, and Background Requirements

You must be at least 21 to drive a commercial motor vehicle across state lines or to transport hazardous materials.² Most states will issue a CDL at 18 for driving that stays inside the state, but a driver under 21 cannot cross state lines commercially.

Beyond age, the baseline eligibility rules are:

You can hold only one driver’s license, from one state. This single-license rule has been in effect since the Commercial Motor Vehicle Safety Act of 1986.³
You need an existing non-commercial license from your home state before you apply.
You must prove U.S. citizenship or lawful permanent residency with a valid U.S. passport, a certified birth certificate, a certificate of naturalization, or a permanent resident card.⁴
You must be able to read and speak English well enough to read road signs, fill out reports, and communicate with inspectors.
You cannot have an active suspension, revocation, or disqualification.

Non-Domiciled CDLs for Certain Visa Holders

Some nonimmigrant workers without permanent residency can obtain a non-domiciled CDL. As of 2026, only individuals in H-2A (temporary agricultural), H-2B (temporary non-agricultural), or E-2 (treaty investor) status qualify. The license cannot be valid longer than the person’s authorized stay or one year, whichever is shorter, and states verify status through the federal SAVE system before issuing.⁵

Employment Authorization Documents are no longer accepted as proof of lawful status for a non-domiciled CDL as of March 2026. Applicants in the eligible visa categories must provide their Form I-94 or a Form I-797A issued by USCIS, along with an unexpired foreign passport.⁵

Military Skills Test Waiver

If you’re a service member or veteran with at least two years of experience driving heavy military vehicles, you may qualify to skip the CDL skills test. The Military Skills Test Waiver Program runs in every state. You need to have been employed in a qualifying military driving role within the past 12 months, and your commanding officer must attest to your safe driving record. Knowledge tests and a standard CDL application still apply.⁶

The DOT Physical and Medical Certificate

Every CDL applicant has to pass a physical from a medical professional listed on FMCSA’s National Registry of Certified Medical Examiners. A regular doctor’s office won’t work unless that provider is on the registry.⁷ The exam covers, among other things:

Vision of at least 20/40 in each eye (with or without correction), at least 70 degrees of peripheral vision in each eye, and the ability to distinguish traffic-signal colors.⁸
Hearing of a forced whisper at five feet or better in the stronger ear, with or without a hearing aid.⁸
Blood pressure and cardiovascular fitness.
General fitness, with attention to conditions like uncontrolled epilepsy, insulin-treated diabetes without an exemption, and substance use disorders.

A passing exam produces a Medical Examiner’s Certificate (Form MCSA-5876), typically valid for up to two years. Drivers with treated hypertension, heart disease, or insulin-dependent diabetes are often certified for only one year so the examiner can reassess sooner.⁹

Self-Certification of Driving Type

When you apply or renew, you have to tell your state what kind of commercial driving you do. The four categories are non-excepted interstate (across state lines in general commerce, medical certificate required), excepted interstate (across state lines but only in specific exempt operations, no federal medical certificate required), non-excepted intrastate (in-state only, medical certificate required by the state), and excepted intrastate (in-state only in operations the state has exempted). If your driving ever crosses state lines for a non-exempt purpose, you have to pick non-excepted interstate even if most trips stay local.¹⁰

Documents You’ll Bring to the Licensing Agency

Federal rules set the minimum paperwork, and your state may ask for more:

Proof of citizenship or permanent residency (valid U.S. passport, certified birth certificate filed with a state vital statistics office, certificate of naturalization, or valid permanent resident card).⁴
Social Security number, which the state verifies through the federal system.
Proof of state residency, such as a government-issued tax form, utility bill, or mortgage statement showing your name and address.⁴
A current Medical Examiner’s Certificate (Form MCSA-5876), if you’re in a non-excepted category.
Your current non-commercial license from the same state.
A driving-history disclosure listing every state where you held any driver’s license in the past 10 years.⁴

Names have to match exactly across every document. A middle name that appears on your birth certificate but not your Social Security card is a small thing that can stop an application cold. Fix any mismatches before the appointment.

From Permit to License

The path to a CDL is a sequence with built-in waiting periods.

The Commercial Learner’s Permit

Once your paperwork checks out, you take the knowledge tests at the state licensing office. The general knowledge test covers safe driving, vehicle inspection, cargo handling, and air brakes (unless you’re accepting the air-brake restriction). Each endorsement you want has its own knowledge test. Passing gets you a Commercial Learner’s Permit (CLP), which lets you practice in a commercial vehicle only with a CDL holder in the passenger seat. Federal rules bar you from taking the skills test during the first 14 days after the CLP is issued.¹¹

Entry-Level Driver Training

Before you can take the skills test, you have to complete Entry-Level Driver Training (ELDT) through a provider listed on FMCSA’s Training Provider Registry. ELDT applies to first-time Class A and Class B applicants, drivers upgrading from Class B to Class A, and first-time applicants for the passenger, school bus, or hazmat endorsements.¹²

The program has two parts: classroom theory covering topics like vehicle inspection, safe operating procedures, hazard perception, hours-of-service, and cargo handling; and behind-the-wheel training on a range and on the road. There’s no minimum number of hours, but students must score at least 80 percent on the theory assessment, and the instructor has to document proficiency in every behind-the-wheel element.¹³

Training costs run wide. Community college and state workforce programs generally charge $2,000 to $4,500 for a Class A program; private trucking schools typically run $4,500 to $7,000; accelerated programs with guaranteed job placement can exceed $10,000. Some carriers sponsor training with reduced or waived tuition in exchange for a driving commitment after graduation.

The Skills Test

The skills test has three parts. The pre-trip inspection asks you to walk around the vehicle and demonstrate out loud that you know how to check tires, brakes, lights, fluids, belts, hoses, coupling devices, mirrors, steering, and emergency equipment; on air-brake vehicles, you also perform leakage, low-pressure warning, and emergency brake tests. Basic vehicle control covers straight-line backing, offset backing, and alley dock, and adds coupling and uncoupling for Class A. The road test is a drive in real traffic evaluating lane changes, turns, highway merging, speed management, and following distance.

Pass all three segments, pay the state’s fee (typically $50 to $200 for the license itself, with separate charges possible for endorsement tests and skills testing), and the agency issues your CDL. It can be valid for up to eight years, depending on the state.¹⁴

Endorsements and Restrictions

A base CDL lets you drive vehicles within your class, but certain cargo and vehicle types require extra endorsements on your license. Each endorsement means a separate knowledge test; some also require a skills test or a background check.

H (hazardous materials): required to haul placarded hazmat; knowledge test plus a TSA security threat assessment with fingerprinting.
N (tank vehicles): required for bulk liquid or gas transport.
P (passenger): required to drive vehicles carrying 16 or more passengers; knowledge and skills tests.
S (school bus): required to operate a school bus; knowledge and skills tests.
T (double/triple trailers): required to pull two or three trailers.
X: a combined tank and hazmat endorsement.

First-time applicants for H, P, and S endorsements must complete ELDT through a registered provider before testing.¹²

Restrictions work the other way. Test in an automatic and you get an E restriction barring manual-transmission commercial vehicles. Fail the air-brake knowledge or skills test, or test in a vehicle without air brakes, and an L restriction blocks you from any commercial vehicle with air brakes. Because most tractor-trailers use air brakes, an L restriction effectively closes off most Class A jobs.

Hazmat and the TSA Assessment

The hazmat endorsement is the most involved to obtain. Beyond the CDL knowledge test, every new, renewing, or transferring applicant must pass a TSA security threat assessment, which means visiting an enrollment center, submitting fingerprints, and undergoing a criminal background check.¹⁵

The TSA fee is $85.25 for new and renewing applicants and is valid for five years. Applicants who hold a valid Transportation Worker Identification Credential (TWIC) and whose state accepts that threat assessment pay a reduced $41.00. TSA recommends enrolling at least 60 days before you need the endorsement because processing can exceed 45 days.¹⁵

Some convictions permanently disqualify you from a hazmat endorsement, including espionage, treason, terrorism offenses, murder, and improper transportation of hazardous materials. Others, including arson, robbery, firearms violations, and drug distribution, are disqualifying if the conviction or release from incarceration occurred within the past five to seven years.¹⁶

Keeping the License Current

Two clocks run once you have a CDL: the license itself and your medical certificate. Renewal requires your state to re-verify your driving record and, where applicable, confirm your medical certification. A hazmat endorsement means retaking the hazmat knowledge test at every renewal and maintaining a valid TSA security threat assessment.¹⁴

Your medical certificate typically expires every two years, or annually if you have a qualifying condition like treated hypertension or heart disease.⁹ If it lapses, your state will downgrade your CDL to a regular non-commercial license. You don’t lose the CDL permanently, but you can’t legally drive a commercial vehicle until you pass a new physical and submit the updated certificate.

What Can Cost You the CDL

Federal rules set minimum disqualification periods, and states can impose more.

Major offenses trigger a one-year loss of CDL privileges on a first conviction, or three years if you were hauling hazmat at the time. A second major offense means lifetime disqualification. Major offenses include driving under the influence, operating a commercial vehicle with a blood alcohol concentration of 0.04 or higher, refusing an alcohol test under implied consent, leaving the scene of an accident, using a commercial vehicle to commit a felony, and causing a fatality through negligent operation. A driver disqualified for life for most of these can apply for reinstatement after 10 years if they complete a state-approved rehabilitation program; that option does not exist for felony drug trafficking or human trafficking convictions.¹⁷

Serious traffic violations are a different tier. Two convictions within three years for any combination of speeding 15 mph or more over the limit, reckless driving, improper lane changes, following too closely, a violation connected to a fatal accident, or operating a commercial vehicle without a valid CDL means a 60-day disqualification. Three or more within three years means 120 days. These apply even if some of the violations occurred in your personal vehicle, as long as the conviction suspended your driving privileges.¹⁷

Railroad crossing violations in a commercial vehicle carry their own escalating penalties: at least 60 days for a first offense, 120 for a second within three years, and a year for a third. They cover failures to stop when required, failing to slow and check for approaching trains, and driving onto tracks without enough clearance.¹⁷

The Drug and Alcohol Clearinghouse

FMCSA operates a national database, the Drug and Alcohol Clearinghouse, that tracks positive drug tests, alcohol violations, and refusals to test for every CDL holder. Employers must query it before hiring a driver and at least annually thereafter. A violation in your record prohibits you from operating a commercial vehicle for any employer until you complete the return-to-duty process.¹⁸

Drivers aren’t strictly required to register on their own, but you have to be registered to give electronic consent for an employer’s query, which is part of every pre-employment check. In practice, if you want to be hired, you’ll register.¹⁹

If a violation lands in your record, the return-to-duty process starts with a substance abuse professional (SAP) who evaluates you and prescribes education or treatment. After completing the SAP’s recommendations, you take a return-to-duty test. Once cleared, the SAP sets a follow-up testing plan requiring at least six unannounced tests in your first 12 months back. The violation stays in the Clearinghouse for five years or until the follow-up testing plan is complete, whichever is longer.²⁰

Owner-operators sit on both sides of this. You’re the driver and the employer, so you have to register in the Clearinghouse in both capacities and follow the query and testing rules that apply to employers.¹⁸

1
Federal Motor Carrier Safety Administration. Commercial Driver’s License
2
eCFR. 49 CFR 391.11 – General Qualifications of Drivers
3
Federal Motor Carrier Safety Administration. Motor Carriers
4
eCFR. 49 CFR 383.71 – Driver Application and Certification Procedures
5
Federal Motor Carrier Safety Administration. Non-Domiciled CDL 2026 Final Rule FAQs
6
Federal Motor Carrier Safety Administration. Military Skills Test Waiver Program
7
Federal Motor Carrier Safety Administration. National Registry of Certified Medical Examiners
8
eCFR. 49 CFR 391.41 – Physical Qualifications for Drivers
9
Federal Motor Carrier Safety Administration. For How Long Is My Medical Certificate Valid
10
Federal Motor Carrier Safety Administration. How Do I Determine Which of the 4 Categories of Commercial Motor Vehicle Operation I Should Self-Certify
11
eCFR. 49 CFR 383.25 – Commercial Learner’s Permit
12
Federal Motor Carrier Safety Administration. Entry-Level Driver Training
13
Federal Motor Carrier Safety Administration Training Provider Registry. ELDT Curricula Summary
14
eCFR. 49 CFR 383.73 – State Procedures
15
Transportation Security Administration. HAZMAT Endorsement
16
Transportation Security Administration. Disqualifying Offenses and Other Factors
17
eCFR. 49 CFR 383.51 – Disqualification of Drivers
18
FMCSA Drug and Alcohol Clearinghouse. Clearinghouse Brochure for Drivers
19
Federal Motor Carrier Safety Administration. Are CDL Drivers Required to Register for the Clearinghouse
20
FMCSA Drug and Alcohol Clearinghouse. Return-to-Duty Process for Drivers