What Happens If You Fail the Idaho Knowledge Test?
Last updated 2026-08-04
A mandatory three-day wait, and paying again
If you fail Idaho's knowledge test, you must wait three days before retesting, and you'll be required to pay the knowledge test fee again. The same three-day wait and repeat fee apply to a failed skills test as well.
This is a real, unavoidable wait -- there's no same-day retest option described in the handbook, so plan around it if you're on a tight schedule to get licensed.
Understanding the computer-adaptive format
Idaho's 40-question knowledge test lets you miss up to 6 questions and still pass (34 correct, 85%), and the test is computer-adaptive -- it can end before you've answered all 40 questions once the outcome is mathematically determined. This means a string of correct answers can end your test early, and conversely, enough wrong answers can end it early as a fail.
Because the test draws directly from the handbook's own content, don't rely on web-based practice tests as an accurate representation of what you'll actually see -- the handbook itself notes that only ITD's own sample questions are a reliable preview.
Where to focus if you're retesting
The "Traffic Laws & the Rules of the Road" chapter and "What Affects Your Driving Privilege and Record" chapter carry the densest concentration of specific, testable numbers in the handbook -- speed limits, parking distances, points thresholds, and DUI penalties among them.
If you're not sure which section tripped you up, these two chapters are the highest-value places to focus a second read before retesting, rather than re-reading the entire handbook cover to cover.
The skills test has its own separate failure consequence
The skills test allows 12 or fewer errors to pass, and can be taken before or after the knowledge test -- though passing the knowledge test first is described as beneficial since it reinforces the rules being tested on the road. Skills tests can only be scheduled during daylight hours and acceptable weather conditions, which is worth factoring into your retest timeline.
A failed skills test triggers the same three-day wait and fee repeat as a failed knowledge test, but the skills test fee itself is split between the county DMV and the skills test examiner, so make sure you understand both portions before your retest appointment.
Accommodations are built into the testing process
The knowledge test is available in English, Arabic, Chinese, Farsi, French, Korean, Russian, Serbo-Croatian, Spanish, Swahili, Vietnamese, and American Sign Language -- worth knowing if language is a barrier to a first passing attempt.
If you have a medical condition that might affect your ability to safely operate a vehicle, the county DMV agent may request a physician's statement before issuing a license -- this is separate from a knowledge-test failure and is worth resolving in advance if it applies to you.
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More Idaho Guides
- How Long Do Idaho's Learner Permits Last?
- How Idaho's Graduated Driver's License Program Works
- What to Bring to Your Idaho Permit Test Appointment
- Do You Need Driver's Education in Idaho?
Rules and requirements change — always confirm current details with Idaho ITD before your exam. Check the full guides index or the Idaho cheat sheet and FAQ, or take a free Idaho practice test.