Idaho DMV written test
Idaho DMV Cheat Sheet
The Idaho knowledge test facts in one place, checked against Idaho Transportation Department (ITD) sources and last verified November 2026.
The numbers
Idaho DMV test numbers to memorize
The Idaho knowledge test has 40 questions and you need 34 correct, which is 85 percent. You can miss 6. The test is given by the Idaho Transportation Department (ITD).
40
Questions on the test
34
85% to pass
Correct answers needed
6
Questions you can miss
14½ for instruction permit; 15 for knowledge test
Minimum age
- Time limit
- The agency does not publish a time limit for the knowledge test, so we do not state one.
- Test fee on record
- $25. The agency's fee page decides exactly what this covers, so confirm it before you go.
- Format
- Computer-based at county driver licensing office
- Online test
- Not offered. You test in person.
- Appointment
- Not required. Walk-ins accepted at county driver licensing offices. Hours vary by location.
Before you go
Documents to bring in Idaho
The Idaho Transportation Department (ITD) asks for these documents for the permit test. Check the agency's current list before you go, because requirements change.
0 of 4 done
- Proof of identity (birth certificate or passport)
- Social Security number
- Proof of Idaho residency
- Parental consent (if under 17½)
If you fail
If you fail: Idaho retake rules
You must wait 3 calendar days after failing a knowledge or skills test before retesting, and the same rule covers Class D, CDL, and endorsements. You pay the fee again on each retake: $5.00 for the knowledge test, and a skills retake costs the full original skills-test fee. Idaho does not publish a limit on the number of attempts.
- knowledge and skills tests, Class A/B/C (CDL) and seasonal CDL knowledge test (CDL) after failure number 1: wait 3 days.
- Attempt limit: the agency does not publish one that we could confirm.
- Retest fee: $5 per attempt.
Who can test
Age and permit rules in Idaho
- Under 18
- Must be at least 14½ for a Supervised Instruction Permit (SIP). Must hold permit for 6 months. Must complete 50 hours supervised driving (10 at night). No passengers under 17 for first 6 months of license.
- Permit versus license
- A Supervised Instruction Permit (SIP) allows driving with a licensed driver 21+ (or licensed driving instructor) in the front seat. Must hold for 6 months before road test. Full license at 16 under Idaho's graduated licensing program.
- Where the test is given
- In-person at any Idaho county driver licensing office.
- How you get results
- Immediate. Pass/fail shown on screen.
Study material
Languages and handbook
Our record of exam languages for Idaho: English, American Sign Language, Arabic, Chinese, Farsi, French, Korean, Russian, Serbo-Croatian, Spanish, Swahili, and Vietnamese.
The study source is the Idaho Driver's Handbook (July 2026 edition).
From learner data
Most missed Idaho practice questions
These free Idaho questions have the lowest correct rates among learners on DMV IQ. Percentages are rounded to the nearest 5 and only questions with enough answers are listed. Each one shows the right answer, so read the reasoning in the handbook, not just the answer.
- 1
If you double your speed, your braking distance increases by about:
Four times
About 30% get it right
- 2
Before towing, the load in a trailer should be positioned so that:
Most weight sits ahead of the trailer axle
About 40% get it right
- 3
The recommended order of child restraint stages is:
Rear-facing, forward-facing, booster, seat belt
About 45% get it right
- 4
Safety authorities recommend that children ride in the back seat until they are at least:
13 years old
About 50% get it right
- 5
A hand signal with the left arm extended downward means:
Slowing down or stopping
About 50% get it right
- 6
When passing another vehicle, you must return to your lane:
Before coming within 200 feet of oncoming traffic
About 50% get it right
Your plan
Free Idaho study checklist
Work through the free practice runs and topic cards, and tick each one off. Your ticks stay on this device.
Test yourself on the Idaho questions
Free practice tests and topic cards, each question with a hint and an explanation from the driver manual.
Start free practice test 1