Underage drinking and driving — Iowa Permit Test

Underage drinking and driving on the Iowa permit test — 4 rules, each with the reason behind it and a question on it while it is fresh.

The rules

A driver under 21 is considered to be operating while intoxicated with a BAC of .02 or more.

Drivers under 21 cannot legally drink at all, so the limit is set close to zero. Even one drink can put you over it.

with a BAC of .02 or more.

Iowa Driver's License Manual, p.37

An underage driver caught with a BAC of .02 or more has driving privileges revoked for at least 60 days.

Even a small amount of alcohol costs a young driver their license for two months or more.

An underage driver will have their driving privileges revoked for a minimum of 60 days and for a minimum of 180 days if the BAC is .08 or more.

Iowa Driver's License Manual, p.37

An underage driver with a BAC of .08 or more has driving privileges revoked for at least 180 days.

At the adult limit the penalty for a young driver jumps to half a year without a license.

An underage driver will have their driving privileges revoked for a minimum of 60 days and for a minimum of 180 days if the BAC is .08 or more.

Iowa Driver's License Manual, p.37

Offenders under 18 cannot get a temporary restricted license while their license is revoked for OWI.

Some adults can get a limited license to drive to work. A teen caught drinking and driving gets no such help.

Offenders under age 18 are not eligible for a temporary restricted license while their license is revoked for OWI.

Iowa Driver's License Manual, p.37

On the test

For a driver under 21, what BAC counts as operating while intoxicated?

.02 or more. Drivers under 21 cannot legally drink at all, so the limit is set close to zero. Even one drink can put you over it. Iowa Driver's License Manual, p.37: “with a BAC of .02 or more.”

How this works

Most practice tests hand you a bank of questions and leave the manual somewhere else. This one puts them together.

You read one law and the reason behind it, then answer a question on that law while it is still fresh. Get it right and you move on; get it wrong and you have found the gap while it is cheap to fix, not on the morning of the exam.

Learning one rule at a time, and proving it immediately, is what turns a manual you skimmed into something you actually know — and it makes studying feel like getting somewhere rather than like waiting to find out.

What it costs

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Where these come from

Every rule here is checked against Iowa Driver's License Manual, published by the Iowa Department of Transportation, and against the state code itself. Last checked 2026-10-04.