Adding a teen driver to a car insurance policy can significantly increase annual premiums. On average, this addition can result in a $3,721 increase, or about 125% more. The cost varies by state, with some states having much higher rates than others.

The state with the highest cost for insuring teen drivers is Louisiana, where the average annual rate nearly triples when a teen is added to the policy. In contrast, some states have lower increases.

Further details on the cost of insuring teen drivers by state are available, including rankings of the cheapest and most expensive states for this type of insurance.