- Class A CLP costs $14; Class B/C CLP costs $13 - both valid for one year.
- Class A CDL costs $70; Class B/C CDL costs $62 - both generally valid eight years.
- You must hold your CLP at least 14 days before scheduling the skills test.
- All knowledge exams, including every endorsement, require an 80% passing score.
Fee & Eligibility Fast Facts
This is the one-page version of the Tennessee CDL Permit Test (TN-CDL) system - the numbers, deadlines, and rules you should be able to recite without opening the manual. Every figure below comes directly from Tennessee Department of Safety and Homeland Security requirements, so bookmark this page and treat it as your quick-reference before test day.
| Credential | Cost | Validity |
|---|---|---|
| Class A CLP | $14 | 1 year |
| Class B or C CLP | $13 | 1 year |
| Class A CDL | $70 | ~8 years |
| Class B or C CDL | $62 | ~8 years |
For a deeper breakdown of every fee scenario, including endorsements and renewals, see the TN-CDL Certification Cost 2026: Complete Pricing Breakdown. If you're still confirming whether you meet baseline eligibility, the full checklist lives in TN-CDL Requirements 2026: Eligibility, Prerequisites & How to Qualify.
Domain-by-Domain Cheat Sheet
The TN-CDL knowledge exams are broken into eight distinct domains. Not every applicant tests on all eight - your required domains depend on the class and endorsements you're pursuing. Here's the fast-scan version of each.
Domain 1: General Knowledge
Required for every CLP/CDL applicant regardless of class. Covers vehicle inspection, basic control, shifting, backing, and defensive driving fundamentals.
- Non-negotiable starting point - everyone tests here first
Domain 2: Air Brakes
Required unless you'll only ever drive air-brake-exempt vehicles. Covers dual air systems, low-pressure warnings, and stopping distances.
- Skip this test and you get an air-brake restriction on your license
Domain 3: Combination Vehicles
Required for Class A applicants. Covers coupling/uncoupling, trailer air brakes, and combination-vehicle handling.
- Paired with General Knowledge and Air Brakes for most Class A candidates
Domain 4: Hazardous Materials
Endorsement-only. Covers placarding, shipping papers, and loading rules for hazmat freight.
- Requires a separate federal background check beyond the knowledge test
Domain 5: Tanker
Endorsement-only. Covers liquid surge, baffles, and special handling for bulk liquid or gas cargo.
- Often paired with Hazmat for fuel-hauling roles
Domain 6: Multiple-Trailer
Endorsement-only. Covers doubles/triples coupling, stability, and off-tracking.
- Only relevant to specific line-haul and freight carriers
Domain 7: Passenger
Endorsement-only. Covers loading, emergency evacuation, and passenger-vehicle-specific inspection points.
- Required for transit, shuttle, and charter driving roles
Domain 8: School Bus
Endorsement-only, usually paired with Passenger. Covers railroad crossings, student loading/unloading, and emergency procedures.
- Carries the strictest procedural rules of any endorsement
For a full breakdown of how these domains interact and which combinations apply to your target job, read TN-CDL Exam Domains 2026: Complete Guide to All 8 Content Areas. If you want a plain-language explanation of how difficult each domain actually feels in practice, How Hard Is the TN-CDL Exam? Complete Difficulty Guide 2026 breaks it down section by section.
Key Takeaway
Every knowledge test - General Knowledge, Air Brakes, Combination Vehicles, and every endorsement - requires an 80% score to pass. There is no domain where a lower threshold applies.
CLP-to-CDL Timeline
The path from walk-in applicant to licensed driver follows a fixed sequence. Skipping steps or mistiming them is the most common reason candidates delay their own start date.
- Prove eligibility: confirm United States citizenship or lawful permanent residence status before your Driver Services Center visit.
- Pass vision and knowledge testing: score at least 80% on the required knowledge exams for your class.
- Meet medical requirements: complete your medical certification before or during the application process.
- Complete Entry-Level Driver Training: finish applicable ELDT modules if your class or endorsement requires it.
- Hold the CLP for 14 days minimum: this waiting period is mandatory before scheduling any skills test.
- Pass the skills test: administered by the state or by certified third-party testers.
If you're mapping this timeline against your own calendar, TN-CDL Exam Dates 2026: Testing Windows, Deadlines & Scheduling covers how to schedule around the 14-day rule and testing center availability. For the exact scoring mechanics behind "pass," see TN-CDL Passing Score 2026: Exactly What You Need to Pass.
One-Week Cram Schedule
If you're using this cheat sheet in the final stretch before an exam appointment, sequence your review by domain weight rather than reviewing everything equally. General Knowledge and, if applicable, Combination Vehicles and Air Brakes deserve the most repetition because they're mandatory for nearly every applicant.
General Knowledge foundation
- Read the relevant chapters of the May 2022 Tennessee CDL Manual
- Drill vehicle inspection sequence until it's automatic
Air Brakes and Combination Vehicles
- Focus on dual air-system diagrams and coupling steps
- Practice questions on stopping distance and low-pressure warnings
Endorsement-specific review
- Study only the domains tied to your target endorsements (Hazmat, Tanker, Passenger, School Bus, or Multiple-Trailer)
- Skip domains that don't apply to your class or job goal
Full review and gap check
- Retake practice questions on any domain scoring below 80%
- Confirm you have citizenship/residency documents ready for your Driver Services Center visit
For a more detailed, multi-week version of this approach with domain-specific strategy, read the TN-CDL Study Guide 2026: How to Pass on Your First Attempt. And if you'd rather see how your prep is trending against real scoring benchmarks, practice testing on the main site is the fastest way to find weak domains before test day.
Credential & Residency Notes
Two policy details trip up applicants who assume Tennessee's rules mirror other states.
These distinctions matter most for applicants planning around long-term validity - an eight-year Class A or Class B/C CDL is the default expectation, but temporary commercial credentials follow a different renewal clock. For a fuller explanation of how Tennessee defines and administers this credential overall, see What Is TN-CDL? and TN-CDL Meaning.
Who Hires TN-CDL Holders
The class and endorsements you complete directly determine which employers will consider you. A Class A holder with Combination Vehicles and Air Brakes clearance qualifies for long-haul tractor-trailer freight work. Add Tanker and Hazmat, and fuel or bulk-chemical carriers open up. Passenger and School Bus endorsements point toward transit authorities, charter companies, and school districts rather than freight carriers.
- Regional and long-haul freight carriers - Class A, Combination Vehicles, Air Brakes
- Fuel, chemical, and bulk liquid haulers - Tanker and Hazmat endorsements
- Transit systems and charter operators - Passenger endorsement
- School districts and student transportation contractors - Passenger plus School Bus
- Local delivery and utility fleets - Class B or C, often without additional endorsements
Because eligibility depends so heavily on your endorsement combination, it's worth reviewing TN-CDL Jobs and TN-CDL Salary Guide 2026: Complete Earnings Analysis before deciding which endorsements to pursue first. If you're still weighing whether the time and testing fees are worth it relative to your career goals, Is the TN-CDL Certification Worth It? Complete ROI Analysis 2026 lays out the tradeoffs in more detail.
Key Takeaway
Choose endorsements based on the job you actually want, not by testing for everything. Each additional domain adds study time and, in some cases, background-check requirements.
FAQ
A Class A CLP costs $14 and a Class B or C CLP costs $13, each valid for one year. The full CDL costs more: $70 for Class A and $62 for Class B or C, generally valid for around eight years.
No. General Knowledge applies to everyone, and Air Brakes plus Combination Vehicles apply to most Class A applicants. Hazmat, Tanker, Multiple-Trailer, Passenger, and School Bus are endorsement-specific and only required if you're pursuing that endorsement.
At least 14 days. This is a fixed waiting period that applies regardless of how quickly you feel ready, so build it into your scheduling from day one.
80% on every required knowledge test, including General Knowledge, Air Brakes, Combination Vehicles, and any endorsement exam you take.
Knowledge exams are administered at Full-Service Driver Services Centers by the Tennessee Department of Safety and Homeland Security. Skills tests are offered both by the state and by certified third-party testers.