How expensive is it?
One option for insuring a teenage driver would be to add your teenager to your existing auto insurance policy once he gets his permanent driver's license. Although this can still be an expensive prospect, your teen might be able to take advantage of certain discounts as a driver on your policy (e.g., safe-driver and multiple-car discounts for which you are eligible).

If you drive an expensive vehicle, it will be even more costly to add your teen to your policy. In this case, you might want to buy your son his own car (a used economy model, of course) and insure it in his name, rather than add him to your own policy. Older vehicles generally pose less risk to insurance companies, because repairs tend to be less expensive than repairs to newer models. Lower risk for the insurer typically translates into lower insurance premiums for you.

What are my options?
The only way to determine your most cost-effective option is to contact your insurance company and shop around with other companies while you’re at it. If you're thinking about purchasing a used car for your teen, be prepared to tell your insurer the make, model, and year of the cars you're considering. This way you can receive accurate insurance quotes. These quotes can help you decide whether to purchase separate insurance for your son or add him to your policy; they may also help you decide which car to purchase, if you go that route. So, get quotes for him as an addition to your policy, as well as for him under his own policy.

Shop Around
You should shop around for other insurance companies by going online for multiple quotes. You may find that it’s less expensive to insure your household drivers with another company, even by several hundreds of dollars. And couldn’t you use that savings for the college fund?

Please note that this description/explanation is intended only as a guideline.