CDL A vs CDL B: Which Do You Need? (2026)
CDL-A covers tractor-trailers and is the more versatile license; CDL-B covers heavy single vehicles. Both require FMCSA-approved ELDT theory — DLA's online theory is $20.
The core difference: combination vs single vehicle
A CDL-A (Class A) license is for combination vehicles — a power unit and a towed unit together — with a gross combination weight rating (GCWR) of 26,001 lb or more, where the trailer being towed is over 10,000 lb. In plain terms, that's the tractor-trailer / 18-wheeler category. A CDL-B (Class B) license is for a single heavy vehicle rated 26,001 lb or more, or one towing a unit of 10,000 lb or less. Straight trucks, large buses, dump trucks, and box trucks are typical CDL-B vehicles.
The dividing line is the trailer: if you're pulling a heavy towed unit over 10,000 lb behind a heavy power unit, you need CDL-A. If your vehicle is heavy but driven as a single unit (or pulls only a light trailer), CDL-B covers it. Both license classes are entry-level training-regulated, so whichever you choose, FMCSA-approved ELDT theory applies — see our What Is ELDT? guide for the federal background.
CDL-A is more versatile
CDL-A is the broader credential. A CDL-A holder can generally operate CDL-B vehicles as well, which means a single Class A license opens both tractor-trailer jobs and most straight-truck and bus roles. That versatility is why CDL-A is the default recommendation for drivers who want the widest range of work and the highest earning potential, including premium freight that pairs with endorsements.
If your career goal is over-the-road or regional tractor-trailer driving, choose CDL-A and start with the CDL-A Theory ELDT course. If you only ever plan to drive a specific single vehicle — a city bus, a local dump truck, a delivery box truck — CDL-B may be all you need, and the CDL-B Theory ELDT course covers that path. When in doubt, CDL-A gives you more options for the same training step.
Both classes require ELDT theory PLUS behind-the-wheel
Whichever class you pick, the federal ELDT rule (effective February 7, 2022) requires two parts: FMCSA-approved theory training AND behind-the-wheel (BTW) training. They are separate requirements. DLA provides the theory portion online for $20 — completed in under 2 hours — for both CDL-A and CDL-B.
The behind-the-wheel portion is done separately at a local FMCSA-registered provider, where an instructor evaluates your driving on a range and on public roads. DLA does not provide BTW — we handle the theory half so you can knock it out fast and cheap, then complete BTW locally. For how the two costs add up overall, see How Much Does a CDL Cost?.
After your license: add endorsements
Your license class sets what vehicle you can drive; endorsements unlock what freight you can haul. Because a CDL-A holder can pull the widest range of trailers (including tankers), endorsements often pay off more on a CDL-A. The highest-paying add-on is typically Hazmat — see What Is the Highest-Paying CDL Endorsement? and Which CDL Endorsement Should I Get? to plan your stack.
If you know you'll want Hazmat, Passenger, or School Bus, you can complete those ELDT theory courses now too — the 3-endorsement bundle is $50 versus $20 each. Endorsement ELDT is separate from your CDL-A or CDL-B theory, but you can do them in the same sitting to get road-ready faster.
Start here ($20 each)
Pillar guides
Other answer guides
State ELDT hubs
Bundles cost less than the same courses bought one at a time, and every price below is the bundled price.
Not sure which one? Every bundle is listed here, with what each one contains.
Training a crew? Fleet accounts cover 10 or more drivers from $25 a seat, billed once, with every completion tracked in one place.
Sending drivers our way? The affiliate program pays 25% commission on every enrollment you refer.
4.9★ Google rating from 390+ verified reviews. 6,936+ drivers trained nationwide.
"Quick and easy set up no hassle, clear instructions. I passed my hazmat test first try with the information given with DLA ACADEMY"
"Such a quick an easy process and super affordable! Would definitely recommend to any of my friends/family!"
"The experience was great. I loved that the price was lower than other companies offering the course, and the course was very informative and easy to go through. Each step was explained along the way, and it gives you steps on what to do next."
Verify DLA Academy by name at the FMCSA Training Provider Registry: tpr.fmcsa.dot.gov
Ready to start? FMCSA-approved, $20.
Verify DLA Academy by name at tpr.fmcsa.dot.gov.