The Wisconsin Department of Transportation does not list any type of age restriction for buying a motor vehicle or for registering one. Wisconsin state statutes do discuss the issue of a minor buying a car though. Section 218.0147 of the WI statutes is titled purchase or lease of motor vehicle by minor.
Subsection 1 states that no minor may purchase or lease any motor vehicle unless the minor, at the time of purchase or lease, submits to the seller or lessor a statement verified before a person authorized to administer oaths and made and signed by either parent of the purchaser or lessee, if the signing parent has custody of the minor or, if neither parent has custody, then by the person having custody, setting forth that the purchaser or lessee has consent to purchase or lease the vehicle.
In more simplistic terms this means that a minor may buy a car but that a parent or guardian will need to sign a statement verifying that the minor has consent to purchase the motor vehicle.
[Let CarInsurance.com help you find affordable auto insurance now.] Subsection 2 goes on to explain that this signed statement will need to application for title that is placed with the WI Department of Transportation (DOT). And Subsection 3 notes that any person who sells or leases a motor vehicle to a minor with knowledge of that fact without procuring the statement described in subsection 1 may be fined not more than $200 or imprisoned for not more than 6 months or both.
Since it appears that a teenager, 16 years old as you asked about, can buy a car in WI with the proper paperwork and consent from a parent or guardian the same may hold true for an insurance policy, but most insurance carriers will not allow it since a minor is not bound to any contract and an insurance policy is a legal contract. Minors applying for auto insurance will normally need to have a parent or guardian sign on any insurance documents since a policy is a type of binding contact.
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For more questions regarding Wisconsin laws and a teenager buying and insuring a car check with the WI DOT and Commissioner of Insurance for WI. You can get a quote here with us for affordable auto insurance.
The Wisconsin Commissioner of Insurance does not that the highest premiums are normally paid by a male driver under age 25, with his rate depending on his marital status and whether he owns, or is the principal driver, of the car being insured. Under the most widely used rating system, the cost of auto insurance for youthful drivers is scaled downward periodically. Rates for unmarried males who are the owners of their cars are reduced periodically from age 17-29. | 
