An F Endorsement Lets You Haul Hazardous Materials in Tanks
An F endorsement on your commercial driver's license authorizes you to transport hazardous materials in bulk inside a tank or tanker vehicle. Without it, you cannot legally haul gasoline, propane, chemicals, or other regulated liquids and gases—even if you hold a CDL. The F stands for tank vehicle, and it is one of several endorsements that restrict what cargo you can carry.
The F endorsement is separate from the H endorsement (hazmat), which certifies you have passed a federal background check and security screening. Many drivers carry both: the H endorsement proves you are cleared to handle hazardous materials at all, and the F endorsement proves you can do so specifically in tank vehicles. Some states require both; others allow F alone for certain non-regulated bulk liquids.
Getting an F endorsement involves passing a written test on tank vehicle safety, weight distribution, emergency procedures, and cargo-specific rules. The test is administered by your state's Department of Motor Vehicles or equivalent licensing body. You must already hold a valid CDL in the class required for the vehicle you will drive (usually Class A or B for tankers).
Key Takeaways
- An F endorsement authorizes you to drive tank vehicles carrying hazardous or bulk liquid cargo, and is required by law in most states for this work.
- You must pass a written knowledge test covering tank vehicle operation, weight distribution, emergency response, and cargo safety before receiving the endorsement.
- Many employers require both an F endorsement and an H (hazmat) endorsement, though requirements vary by state and cargo type.
- The F endorsement test covers real-world scenarios like rollover prevention, proper braking, and what to do if your tank ruptures or leaks.
- Once you pass the test, the endorsement is added to your CDL card and remains valid for the same period as your license renewal cycle.
What the F Endorsement Test Covers
The F endorsement knowledge test focuses on the unique hazards of operating a tank vehicle. Tank vehicles have a higher center of gravity and are prone to rollover, especially during turns or emergency braking. The test asks questions about how to prevent rollovers, how weight distribution inside the tank affects handling, and why you cannot brake the same way you would in a regular truck.
You will also be tested on emergency procedures. This includes what to do if your tank ruptures, leaks, or catches fire; how to identify the cargo you are carrying; and when to call hazmat teams or emergency responders. The test covers proper placarding (the diamond-shaped warning labels on the vehicle), documentation requirements, and how to communicate the hazard to other drivers and first responders.
The number of questions and passing score vary by state. Most states require 80 percent or higher to pass. You can usually take the test at your local DMV office, and many states allow you to study using the same CDL manual you used for your general knowledge test, with a supplemental section on tank vehicles.
F Endorsement vs. H Endorsement: What Is the Difference
The H endorsement (hazmat) is a federal security clearance that certifies you have passed a background check and are authorized to handle hazardous materials in any vehicle type. The F endorsement is a state-level certification that you know how to safely operate a tank vehicle. They serve different purposes and are often required together.
If you want to haul gasoline in a tanker truck, most states and employers require both endorsements. The H endorsement proves you are not a security risk; the F endorsement proves you understand tank vehicle dynamics and emergency procedures. Some states allow you to carry certain non-regulated bulk liquids (like water or milk) with only an F endorsement and no H. Check your state's regulations and your employer's requirements before testing.
The H endorsement requires a Transportation Security Administration (TSA) background check, fingerprinting, and a fee (usually $85 to $100). The F endorsement requires only the written test and a smaller fee (typically $10 to $50). Both are added to your CDL card, and both must be renewed when your license expires.
How to Prepare for the F Endorsement Test
Start by obtaining your state's CDL manual, which includes a section on tank vehicles. Read the tank vehicle section carefully, paying special attention to weight distribution, braking, and rollover prevention. Many states post sample test questions online or in the manual itself. Take practice tests if your state offers them through the DMV website.
Focus on real-world scenarios: What happens if you brake hard while turning? Why do tank vehicles need to be loaded to a specific level? What is surge, and why does it matter? These concepts are tested because they directly affect safety. If you have access to a tank vehicle or can ride along with an experienced driver, observe how they handle turns, braking, and weight shifts.
Some CDL training schools offer F endorsement prep as part of their curriculum or as an add-on. If you are already enrolled in a CDL program, ask whether F endorsement training is included. If you are testing independently, budget 2 to 4 weeks of study time, depending on your familiarity with commercial vehicles.
When You Need an F Endorsement and When You Do Not
You need an F endorsement if you operate a vehicle designed to carry hazardous materials or bulk liquids in a tank. This includes gasoline tankers, propane trucks, chemical haulers, and milk tankers. If the vehicle has a permanently attached tank and you are transporting cargo inside it, an F endorsement is legally required in most states.
You do not need an F endorsement if you are hauling cargo in drums, boxes, or other containers loaded onto a flatbed or enclosed trailer, even if the cargo is hazardous. You also do not need it if you are driving a regular truck that happens to have a small fuel tank for its own use. The endorsement applies only to vehicles where the tank itself is the cargo container.
Some states have exceptions for small quantities or non-regulated materials. For example, a farmer hauling water in a tank may not need an F endorsement in some jurisdictions. Always check your state's specific rules and your employer's requirements before assuming you do or do not need the endorsement.
Renewing and Maintaining Your F Endorsement
Your F endorsement renews automatically when you renew your CDL, as long as you remain in good standing. You do not have to retake the F endorsement test at renewal unless your state requires it or your license was suspended or revoked. Most states allow you to renew by mail or online if you have no violations.
If your CDL is suspended or revoked, your F endorsement is suspended or revoked with it. If you are convicted of certain traffic violations or safety infractions, you may lose the endorsement even if your CDL remains valid. Violations specific to hazmat or tank vehicle operation (such as improper placarding or unsafe loading) can result in endorsement suspension.
Keep your CDL card and any renewal notices in a safe place. If your card is lost or damaged, request a replacement from your state DMV. The replacement will include your F endorsement if it was on the original card.
F Endorsement and Insurance or Employment Requirements
Many employers require an F endorsement as a condition of hiring for tank vehicle positions. Some also require additional training beyond the state test, such as company-specific hazmat procedures or defensive driving certification. Ask potential employers what endorsements and certifications they require before you test.
Insurance companies may offer lower rates or better coverage options if you hold an F endorsement, because it demonstrates you have formal training in tank vehicle safety. Some insurers require the endorsement for certain routes or cargo types. If you are self-employed or own a small fleet, contact your insurance agent to understand how the endorsement affects your premiums and coverage.
Frequently Asked Questions
Do I need both an F and an H endorsement to haul gasoline?
In most states and for most employers, yes. The H endorsement is a federal security clearance, and the F endorsement certifies you can operate a tank vehicle safely. Some states allow F alone for certain non-regulated bulk liquids, but gasoline almost always requires both. Check your state's rules and your employer's policy.
How long does it take to get an F endorsement?
The test itself takes 30 to 60 minutes. You can usually schedule it at your local DMV within a week or two. If you pass, the endorsement is added to your CDL card on the spot or within a few days, depending on your state's process. The main time investment is studying the tank vehicle section of the CDL manual, which typically takes 2 to 4 weeks.
What happens if I fail the F endorsement test?
You can retake the test after a waiting period, which varies by state (usually 1 to 7 days). There is no limit on how many times you can test. Most people pass on the second or third attempt if they study the material carefully. Review the questions you missed and focus on those topics before retesting.
Can I lose my F endorsement if I get a traffic ticket?
A regular traffic ticket usually does not affect your F endorsement. However, serious violations—such as reckless driving, DUI, or violations specific to hazmat transport—can result in suspension or revocation of the endorsement. Your state's DMV will notify you if your endorsement status changes.
Do I need an F endorsement to haul water or milk in a tank?
It depends on your state and whether the material is regulated as hazardous. Most states require an F endorsement for any vehicle with a permanently attached tank used to transport cargo, regardless of what is inside. Some states make exceptions for certain non-hazardous bulk liquids. Contact your state DMV or your employer to confirm what is required for your specific cargo.