CDL Exam Requirements by State: What to Expect in 2026

Getting your CDL means passing two rounds of testing: a written knowledge exam to earn your Commercial Learner's Permit (CLP), and a three-part skills test to convert that permit into a full Commercial Driver's License. While federal regulations set the baseline rules, every state handles scheduling, fees, and testing logistics differently.

This guide covers exactly what each exam involves, how requirements vary by state, what endorsement exams add to the process, and how to prepare effectively. All data is pulled from our database of 51 state CDL programs, verified against official DMV sources.

The CDL Knowledge Test: What's on It

The knowledge test is a written (or computer-based) exam you take at your state's DMV or driver licensing agency. You must pass it to receive your Commercial Learner's Permit. Per federal regulation (49 CFR 383.135), you need a score of at least 80% on each section.

Knowledge Test Components

• General knowledge (safe operations regulations, vehicle control systems, basic control, visual search, communication, space management, emergency systems)
• Air brakes (required if operating vehicles equipped with air brakes; failure results in air brake restriction)
• Combination vehicles (required for Class A CDL; covers coupling/uncoupling, combination vehicle inspection)
• Endorsement-specific knowledge tests (Hazardous Materials, Passenger, Tank Vehicle, Double/Triple Trailers, School Bus)

The general knowledge section is required for all CDL applicants. The air brakes section is required if you'll operate vehicles with air brake systems — if you skip it or fail, you'll receive an air brake restriction on your CDL. The combination vehicles section is required only for Class A applicants.

The CDL Skills Test: Three Parts You Must Pass

After holding your CLP for at least 14 days and completing Entry-Level Driver Training (ELDT), you're eligible for the skills test. This is a hands-on exam administered in a real commercial vehicle. Per 49 CFR 383.113, it has three segments that must be completed in order:

1. Pre-Trip Vehicle Inspection

The applicant must demonstrate the ability to conduct a thorough pre-trip inspection of the vehicle, identifying each safety-related part on the engine compartment, cab, and exterior, and explaining what must be inspected to ensure safe operating condition. Includes engine compartment components (oil level, coolant level, belts, hoses, leaks), cab interior checks, and exterior walk-around inspection.

2. Basic Vehicle Control Skills

The applicant must demonstrate basic vehicle control skills in an off-road environment, including straight-line backing, offset backing (left and right), alley dock (backing into a space), and other maneuvers as specified for the vehicle class.

3. On-Road Driving

The applicant must demonstrate safe on-road driving skills including proper lane changes, turns, merging, highway driving, use of mirrors, and appropriate speed management. The examiner evaluates the applicant's ability to operate the vehicle safely in traffic conditions.

Skills Test Fees by State

Skills test fees vary significantly by state and whether you test at a state DMV facility or through an authorized third-party tester. 43 out of 51 states allow third-party testing, which is often faster to schedule but costs more.

Endorsement Exams: Additional Tests for Specialized CDL Jobs

Beyond the base CDL, you can add endorsements that authorize you to haul specific types of cargo or passengers. Each endorsement requires passing an additional knowledge test. Two endorsements (Passenger and School Bus) also require a separate skills test.

The HazMat (H) and Combination HazMat/Tanker (X) endorsements require a TSA security threat assessment, which includes fingerprinting and a background check. The current TSA fee is $85.25 and must be renewed every 5 years. For more detail on each endorsement, see our CDL Endorsements Explained guide.

Military Waivers: Skipping Part (or All) of the CDL Exam

If you're an active-duty service member or veteran with qualifying military vehicle experience, you may be eligible to waive portions of the CDL exam. Out of 51 states:

• 51 states offer skills test waivers for qualified military CDL holders
• 9 states also waive the knowledge test
• 51 states have some form of military waiver program

Eligibility requirements vary but typically require: current or recent military service (within 1–2 years of discharge), experience operating military vehicles equivalent to the CDL class you're applying for, and a clean driving record. See our Military to CDL Veterans Guide for complete details.

How to Prepare for the CDL Exam

Knowledge Test Preparation

• Study the CDL manual. Every state publishes a free CDL driver's manual based on the FMCSA-approved content. This is the single most important study resource.
• Take practice tests. Online practice tests use questions from the same FMCSA-approved question pools. Aim to consistently score above 90% before scheduling your exam.
• Focus on air brakes. The air brakes section has the highest failure rate. Memorize the components, operating procedures, and emergency protocols.
• Study endorsement material separately. Each endorsement has its own knowledge test. Don't try to study everything at once — focus on the base CDL first, then add endorsement material.

Skills Test Preparation

• Complete ELDT. Entry-Level Driver Training is federally required and gives you the behind-the-wheel hours you need.
• Practice the pre-trip inspection out loud. You'll need to verbally walk through every component. Develop a consistent routine and stick to it.
• Master backing maneuvers. Straight-line backing, offset backing, and alley docking are where most candidates struggle. Practice until these become second nature.
• Know the automatic failures. Running a red light, causing an accident, or any dangerous action is an automatic fail. When in doubt, be conservative.

How Much Does CDL Testing Cost?

Testing costs are just one piece of the overall CDL expense. Government fees across 51 states range from $28 to $345 for the CLP, license, and skills test combined. Training programs are the larger cost driver. For a complete breakdown, see our CDL Cost by State guide.

Wondering which states make the process easiest? Check our Easiest States to Get a CDL ranking, which factors in training hours, testing fees, and overall timeline.

Frequently Asked Questions

Bottom Line

The CDL exam process is standardized at the federal level but executed differently in every state. Your path to a CDL involves passing a knowledge test (80% minimum), holding your CLP for at least 14 days, completing ELDT, and passing a three-part skills test. Endorsement exams add extra steps for specialized jobs.

For a complete look at CDL requirements in your state — including fees, training programs, and step-by-step application instructions — visit our CDL requirements hub.