Iowa permit test FAQ 2026: how many questions, pass mark, cost

The Iowa DOT does not publish the number of questions; reported counts differ, so our practice tests use a site format of 25 questions with 20 correct (80%) to pass, which matches the Iowa DOT's own online practice test (25 questions, 80%).

The Iowa DOT does not publish a pass mark for the Iowa knowledge test. Our practice tests use 20 of 25 (80%) (a site format).

You need 20 of 25 (80%) to pass, so in our 25-question site format you can get at most 5 wrong. The best preparation is to study the official Iowa Driver's Manual (edition not verified) and take practice tests until you pass them comfortably.

$6 — Class C instruction permit (4 years), per the Iowa DOT.

Yes. This site has 2 free Iowa knowledge test practice tests for 2026, each with 25 questions and our site-format pass mark of 20 of 25 (80%), plus a free road-sign quiz.

The Iowa DOT does not publish a time limit for the Iowa knowledge test.

No waiting period found on the Iowa DOT pages read 2026-10-14. Supporting context (Iowa Administrative Code 761—604.9(4), read directly): 'An applicant who fails a knowledge test may repeat the test at the discretion of the examiner.' No attempt limit found. Supporting context (761—604.9(3)): 'The test score result is valid for 180 days.' At-home online test (Skip the Trip page, read 2026-10-14): 'The link sent in the email will expire after 72 hours.'

The permit itself requires age 14 ('Be at least 14 years old.', Iowa DOT permit page, read 14 Oct 2026). For the at-home test the two DOT pages differ: the Skip the Trip page says 'The student must be within 30 days of their 14th birthday and younger than 18', while the permit page says 'To apply to take the test at home, the child must be at least 14 years old.' The minimum age for the license is 14, per the Iowa DOT.

Under-18 permit page (read 2026-10-14): 'Be at least 14 years old.' 'Pass the knowledge and vision test.' 'Your parent or guardian must provide written consent, either in-person at the DMV or complete the Parent's/Guardian's Written Consent Form (form 430018)'; 'Provide a primary form of identification, proof of residency, and proof of Social Security number.' Excerpt (not re-read): the knowledge test can be waived for holders of a valid operator instruction permit or driver's license.

The official Iowa Driver's Manual (edition not verified). You can read it on the official site.