Iowa Department of Transportation, Motor Vehicle Division
Iowa permit test: 25 questions
Original Iowa questions with the law cited under every answer, scored the way Iowa DOT scores it.
- Exam Simulator25 questions, pass with 20, scored the way Iowa DOT scores it
- Practice Test 120 questions, a broad first pass across signs, right of way, rules and safety
- Road Signs Full197 questions, every sign, signal and pavement marking question
- Laws and Limits12 questions drawn from the Iowa Code Ch. 321
Work through them in order.
IA Practice Test 1
IA Practice Test 2
IA Practice Test 3
IA Practice Test 4
IA Practice Test 5
IA Full Marathon
IA Road Signs Mini
IA Road Signs Full
IA Right of Way
IA Complex Situations
Iowa Laws and Limits
IA Alcohol, Phones and Safety
IA Rules of the Road
Iowa Exam Simulator
Every question you miss saves to a review deck on this device. See how the review deck works.
Know the format before you book.
Iowa is the state whose own rules explain why nobody can tell you the exam format. Iowa Administrative Code 761-604.20 provides that a knowledge test may be revised at any time and that each test states its own minimum passing score, so there is no fixed statewide question count or pass percentage to look up and the mark you are held to is the one printed on the paper in front of you. The only official numbers Iowa DOT prints belong to its practice test, which serves 25 questions drawn at random from a bank that includes questions from the real exam and asks for 80 percent. Iowa is also where the exam can happen furthest from a licensing office: a parent or guardian holding a valid Iowa license can proctor the permit knowledge test at home from 30 days before the applicant's 14th birthday, using DOT form 431508, and participating schools can run it on site.
Honest note: Iowa DOT does not publish the exam format in a place we could confirm, so the 25 question count and the pass mark of 20 shown here are our best information rather than a verified fact. The practice questions themselves teach Iowa law either way. Confirm the format with Iowa Department of Transportation, Motor Vehicle Division before your appointment.
Iowa DOT: format figure not published; checked 2026-08-27
What the process looks like.
The knowledge test is written from the Iowa Code Chapter 321, Motor Vehicles and Law of the Road. Our questions teach those same rules and cite the section behind each answer, so what you learn holds up on test day and on the road afterwards.
Iowa opens its graduated licensing path with an instruction permit at 14, one of the youngest starting ages of any state.
Teens can sit the permit knowledge test without going near a licensing office. Iowa DOT lets a parent or guardian with a valid Iowa license proctor the test at home from 30 days before the student's 14th birthday until they turn 18, and participating schools can run it on site.
The at home option runs on an approval, not a walk in. A parent submits Iowa DOT form 431508, Application to Proctor Knowledge Exam, waits 7 to 14 days for processing, then receives an emailed test link that expires after 72 hours.
An intermediate license follows at 16, still carrying limits on late-night driving and on the number of young passengers a new driver can carry.
A full license becomes available at 17, once the intermediate stage's supervised-driving and restriction requirements have been met.
Iowa's rules leave retakes to the examiner's discretion rather than fixing a waiting period, and a passing knowledge result stays valid for 180 days.
Iowa permit test questions, answered.
How many questions are on the Iowa knowledge test?
Iowa DOT does not publish the number. The closest official figure is its own practice test, which serves up 25 questions pulled at random from a bank that includes questions from the real exam. The 25 figure carried here follows that practice format, so treat it as a working assumption rather than the confirmed length of the real test.
What score do you need to pass the Iowa permit test?
80% is the figure everyone quotes, and it is the mark Iowa DOT sets on its own practice test. For the real exam the state has never printed a number, and that turns out to be on purpose. Treat 80% as strongly indicated rather than published.
Why does Iowa not publish a pass mark for the real test?
Because its administrative rules hand that decision to the test itself. Iowa Administrative Code 761-604.20 allows a knowledge test to be revised at any time and requires each version of the test to carry its own minimum passing score. So there is no fixed statewide number to look up, and the mark you are held to is the one printed on the exam in front of you.
Where do you take the Iowa knowledge test?
At an Iowa DOT driver's license station or at a county treasurer's office, which handle driver licensing for much of the state. Under 18s also have the at home and at school proctored options, and a passing result there still means a trip in to be issued the permit itself.
How long does a passing Iowa knowledge test last?
180 days. That is set in Iowa Administrative Code 761-604.20, which also leaves retakes after a failure to the examiner's discretion instead of imposing a fixed waiting period.
How old do you have to be to get an Iowa instruction permit?
14, among the youngest permit ages nationwide, well before the knowledge test becomes the main hurdle at the intermediate license stage.
When can an Iowa teen get a full, unrestricted license?
At 17, after holding an intermediate license and meeting its supervised-driving requirements.