X Certification Cost 2026: Complete Pricing Breakdown

Cost Overview: What "X" Actually Costs

Before pricing anything out, it helps to understand what you're actually paying for. The Combination of Tank Vehicle and Hazardous Materials endorsement - printed as "X" on a commercial driver's license - is not a single certification you buy from a private organization. It's a combined code the Federal Motor Carrier Safety Administration recognizes when a driver holds both the Hazardous Materials (H) endorsement and the Tank Vehicle (N) endorsement simultaneously. That structural fact matters for cost, because you're really pricing out two separate knowledge tests, one federal background check, and (for the hazmat half only) a training requirement.

Because state driver licensing agencies administer the knowledge tests rather than a national commercial testing vendor, there is no single universal fee schedule. What is federally fixed is the security threat assessment fee, the 80 percent passing threshold on each test under 49 CFR 383.135, and the entry-level training mandate for first-time H applicants. Everything else - state test fees, endorsement issuance fees, and CDL amendment charges - varies by jurisdiction. If you want the full eligibility picture before you start budgeting, our X Requirements guide walks through every prerequisite step by step.

TSA Security Threat Assessment Fee

The single largest fixed cost tied to X is the TSA Security Threat Assessment, which is required because you'll be transporting hazardous materials. Effective January 1, 2025, the fee structure is:

• $85.25 for new applicants and for applicants renewing their hazmat endorsement
• $41.00 reduced rate for applicants who hold a valid TWIC (Transportation Worker Identification Credential) in a state that accepts TWIC comparability

This fee covers fingerprinting and the background check process and is paid regardless of which state issues your CDL. It applies only to the hazmat (H) side of the X combination - the tank vehicle (N) endorsement itself does not trigger a separate federal security fee.

State Knowledge Test and Endorsement Fees

Because state driver licensing agencies administer both knowledge tests, fees for test attempts, endorsement additions, and CDL reprints differ from state to state. What stays consistent everywhere is the content and passing standard:

• The hazmat knowledge test commonly runs 30 questions covering material defined in 49 CFR 383.121
• The tank vehicle knowledge test commonly runs 20 questions covering material defined in 49 CFR 383.119
• Both tests require an 80 percent passing score, as mandated by 49 CFR 383.135

Because the exact dollar figures depend on your licensing state, the smartest way to budget is to check your state driver licensing agency's published CDL endorsement fee schedule directly rather than relying on a national average. For a breakdown of exactly what's tested and how the questions are weighted, see the X Exam Domains Guide, and for the specifics of the scoring rule itself, review the X Passing Score guide.

Hazmat ELDT Training Costs

Since February 7, 2022, first-time applicants for the H endorsement must complete hazmat entry-level driver training from a provider listed on the FMCSA Training Provider Registry before they're eligible to take the knowledge test. This is a real cost consideration because training providers set their own pricing, and it applies specifically to the hazmat half of X - the tank vehicle endorsement carries no ELDT requirement at all.

When budgeting, treat ELDT as a separate line item from the knowledge test fee itself. You'll want to confirm with your chosen training provider:

• Whether the course is theory-only or includes a behind-the-wheel component (theory instruction is what's required for the H knowledge test path)
• Whether your employer or driving school already has a registered provider relationship
• How the training maps to the actual test content in 49 CFR 383.121

Many candidates pursuing X combine this required training period with focused review using a structured study guide, since the ELDT course and the knowledge test cover overlapping regulatory material.

Tank Vehicle (N) Endorsement Costs

The tank vehicle side of X is comparatively lighter on cost mechanics because it has no federal training mandate and no TSA background check attached. A tank vehicle, for licensing purposes, is defined as a vehicle carrying liquid or gaseous material in a tank with an individual rated capacity over 119 gallons and an aggregate capacity of 1,000 gallons or more. Your only direct costs here are:

• The state knowledge test fee (or bundled CDL application fee) for the 20-question tank vehicle exam
• Any endorsement addition fee charged by your state

Because there's no separate certifying vendor and no comparability program for this half, the N portion of your X cost is essentially just whatever your state charges to add and test for the endorsement.

Renewal Costs Every Five Years

X is not a one-time purchase. Both underlying endorsements sit on a CDL that requires periodic renewal, and hazmat-carrying endorsements specifically require a new Security Threat Assessment every five years. That means the $85.25 (or $41.00 with qualifying TWIC comparability) TSA fee recurs on that same cycle, in addition to whatever state renewal fees apply to your license overall.

Total Cost Estimate Table

Because state figures vary, the table below organizes cost categories by what's federally fixed versus what depends on your jurisdiction, so you know exactly what to verify locally.

Hidden Costs: Prep Time and Materials

The line items above cover the official fees, but there's a real cost most candidates underestimate: time spent preparing across ten distinct content areas. X candidates need working knowledge of Hazardous Materials Regulations, Hazardous Materials Handling, Operation of Emergency Equipment, Emergency Response Procedures, Causes and Prevention of Cargo Surge, Braking Procedures for tanks at various fill levels, Baffled versus Non-Baffled tank handling, Tank Vehicle Type and Construction differences, effects of Road Grade and Curvature on tank handling, and Proper Use of Emergency Systems.

The heaviest of these by far is hazardous materials regulations - it covers the Hazardous Materials Table, shipping papers, marking, labeling, placarding, packaging, ORM-D classifications, hazmat accident reporting, and rules around tunnels and railroad crossings. Underestimating the study time this domain requires is one of the most common reasons candidates need a retake, which adds cost in the form of repeated test fees.

For a domain-by-domain breakdown of exactly what each of these ten areas tests, the X Exam Domains Guide is worth reviewing before you schedule your training or test dates.

Who Pays: Employer Sponsorship and Reimbursement

Because X is required for driving tank trucks carrying regulated hazardous liquids or gases - fuel haulers, chemical transport carriers, and bulk liquid distributors among them - many trucking companies treat the endorsement as a hiring investment rather than an individual expense. It's common for carriers to cover or reimburse the TSA background check fee, the ELDT training cost, or both, especially when they're actively recruiting for tank and hazmat routes. If you're evaluating whether to pursue X on your own dime or wait for employer sponsorship, it's worth reviewing how X training programs are typically structured so you know what a sponsoring employer is actually paying for.

Before committing your own money, ask a prospective employer directly whether they reimburse endorsement costs after a probationary period - this single question can change your effective out-of-pocket total substantially.

Cost Versus Value for Your CDL

Pricing out X in isolation only tells half the story. The real question most drivers are trying to answer is whether the combined cost of the TSA fee, ELDT training, and state testing fees is justified by the driving opportunities it unlocks. That's a broader analysis than pricing alone, and we cover it in detail in our ROI breakdown of the X certification. If you're still deciding whether to pursue the endorsement at all, it's worth reading that alongside this cost guide before you schedule any tests or training.

Whatever you decide, once you've confirmed the fee structure for your state, the best way to avoid paying for a retake is disciplined preparation. You can run through realistic scored practice questions on our main practice test platform to gauge readiness on both the hazmat and tank vehicle content before you pay for the official state test. Repeated exposure to test-style questions through practice testing is generally far cheaper than a second knowledge test fee.

Frequently Asked Questions