How to Get a CDL Permit in Illinois
One thing sets Illinois apart in the CDL process: once issued, your commercial learner's permit (CLP) stays valid for a full year, not the 180 days common in most other states — giving you more breathing room between the knowledge test and the skills test.
Line up your documents first
Illinois requires proof of legal presence appropriate to your application category, plus a Medical Examination Report (Form 649-F) and self-certification to the Secretary of State that you're medically qualified to drive commercially.
You'll also need a valid noncommercial Illinois driver's license before the Secretary of State will process a CLP application at all.
Pay the fee and pass the knowledge tests
At a Secretary of State facility, pay the $50 processing fee and pass the knowledge test(s) for the class of CDL you're pursuing: general knowledge for everyone, plus combination-vehicle and air-brake tests if they apply to your training vehicle.
Federal rule requires completing entry-level driver training (ELDT) through an FMCSA-registered provider before this point, if it's your first CDL, an endorsement upgrade, or a vehicle-class upgrade.
Use the long CLP window to your advantage
Federal rule still requires holding the CLP for at least 14 days before scheduling the skills test, but Illinois' full-year validity means you're not racing a 180-day clock the way applicants in many other states are.
Complete your behind-the-wheel ELDT training during this window, since the skills test itself can't be scheduled until that training is documented.
The skills test and beyond
Book a second Secretary of State appointment for the skills test: a pre-trip inspection, then an on-road driving evaluation for the CDL class you applied for.
Passing gets you your Class A, B, or C license, with any endorsements (passenger, school bus, hazardous materials) reflecting whatever additional tests you passed along the way.
Frequently Asked Questions
How long is an Illinois CLP valid for?
A full year — notably longer than the 180-day validity common in many other states, giving Illinois applicants more scheduling flexibility between the knowledge and skills tests.
What does the Illinois CLP application cost?
A $50 processing fee is paid at the Secretary of State facility when you take the knowledge test. Confirm current fees on the official Illinois SOS website, since they can change.
Is the CDL general knowledge test the same in every state?
The format (50 questions, 80% passing) is set by federal rule and is the same nationwide, though the application process and any endorsement-specific tests are administered by each state's own licensing agency.
Ready to put this into practice?
Start a free Illinois cdl practice testLast reviewed: 2026-07-14