CDL state guide
Iowa CDL Requirements — Complete Guide (2026)
Get your CDL in Iowa. Learn the knowledge test requirements, fees, minimum age, CLP process, and where to apply for your Iowa Commercial Driver's License. This guide is a planning page built from official Iowa DOT source links, with reminders to verify final fees and test availability before you apply.
Quick answer
Start with the CLP, medical certification, and the General Knowledge test
Most Iowa CDL applicants need a valid regular driver license, must be at least 18 for intrastate commercial driving or 21 for interstate operation, and must pass the required knowledge tests before the CDL skills test. The CLP must be held at least 14 days before skills testing.
At a glance
Iowa CDL at a glance
| Minimum age | 18 intrastate / 21 interstate |
|---|---|
| General Knowledge test | 50 questions, 80% to pass |
| CLP fee | Commercial learner permit: $12 |
| CDL fee | CDL: $8 per year; endorsement fees may apply |
| CLP holding period | 14 days minimum before the CDL skills test |
| CDL valid for | Up to 8 years by underlying license term |
| Issuing agency | Iowa DOT |
Classes
CDL classes available in Iowa
Iowa follows the federal CDL class structure: Class A for qualifying combination vehicles, Class B for many single heavy vehicles, and Class C for certain passenger or hazardous-material vehicles below Class A/B thresholds. The class you apply for should match the vehicle you will test in and the commercial work you plan to do.
Iowa applicants should review rural highways, agriculture traffic, winter conditions, railroad crossings, and inspection rules.
Process
How to get your CDL in Iowa
- Confirm eligibility with Iowa DOT and make sure your regular driver license is valid.
- Complete any required DOT medical certification and keep your medical status current.
- Study the official Iowa CDL manual before taking knowledge tests.
- Pass General Knowledge and any class or endorsement tests needed for your CLP.
- Hold the CLP for at least 14 days and practice with a qualified CDL holder when required.
- Complete ELDT when it applies, especially for first-time Class A/B, Hazmat, Passenger, or School Bus paths.
- Iowa applicants should confirm CDL skills-test scheduling and whether third-party testing applies.
Use Iowa DOT CDL pages to confirm CLP, knowledge testing, medical certification, and skills-test steps.
Knowledge tests
CDL knowledge tests in Iowa
The General Knowledge test is the common starting point. Additional tests depend on your class, vehicle, air-brake system, cargo, and endorsements. Test counts below are practical planning figures; verify the current testing screen and endorsement list with Iowa DOT.
| Test | Questions | Passing score | When it matters |
|---|---|---|---|
| General Knowledge | 50 questions | 80% | Required starting test for most CDL applicants. |
| Air Brakes | Usually 25 questions | 80% | Needed if the vehicle has air brakes and you do not want an air-brake restriction. |
| Combination Vehicles | Usually 20 questions | 80% | Common for Class A combination vehicle applicants. |
| Hazardous Materials | Usually 30 questions | 80% | Requires extra federal/TSA and ELDT steps when applicable. |
| Passenger | Usually 20 questions | 80% | Needed for passenger-carrying commercial vehicles. |
| School Bus | Usually 20 questions | 80% | Usually requires Passenger plus school-bus-specific testing. |
| Tank Vehicle | Usually 20 questions | 80% | Needed for qualifying tank vehicles or certain liquid/gas cargo. |
Endorsements
CDL endorsements in Iowa
Iowa CDL applicants can usually pursue the standard federal endorsements: H Hazardous Materials, N Tank Vehicle, P Passenger, S School Bus, T Double/Triple Trailers, and X Tanker plus Hazmat. Hazmat, Passenger, and School Bus paths can involve extra checks, ELDT, or skills-test requirements.
Fees
Iowa CDL fees
| CLP application fee | Commercial learner permit: $12 |
|---|---|
| CDL application/license fee | CDL: $8 per year; endorsement fees may apply |
| Skills test fee | May be separate if a third-party skills tester is used; confirm with Iowa DOT or the approved tester. |
| Endorsement fees | Often listed separately by endorsement or transaction; verify before adding Hazmat, Passenger, School Bus, Tanker, or other endorsements. |
| Renewal fee | Renewal cost can differ from original issuance. Check your state fee schedule before renewal. |
Official resources
Official Iowa CDL resources
Study path
Next steps for Iowa CDL prep
FAQ
Iowa CDL questions
How old do I need to be to get a CDL in Iowa?
Plan for 18 for intrastate commercial driving and 21 for interstate driving, hazardous materials, and many cross-state jobs. Verify final restrictions with Iowa DOT.
How long do I have to hold a CLP in Iowa?
Federal CDL rules require at least 14 days before taking the CDL skills test. Iowa may add scheduling or documentation steps.
What score do I need on CDL knowledge tests?
Use 80% as the planning benchmark for CDL knowledge tests unless Iowa DOT states a different rule for a specific test.
Where should I verify Iowa CDL fees?
Use the official Iowa DOT CDL page, fee schedule, or office because CLP, CDL, endorsement, renewal, duplicate, and skills-test fees can be listed separately.
Other state CDL guides
Compare nearby state CDL rules
Commercial driver license fees, testing offices, and skills-test scheduling can differ across state lines. Use these related state pages when comparing CDL paths.
Source note: Last checked June 29, 2026 against the official Iowa DOT CDL page and linked manual/office resources. US Permit Prep is independent and not affiliated with any DMV, state agency, or FMCSA.
