An SR-22 is a certificate verifying that you carry the minimum coverage auto insurance required by law, not an actual insurance policy. In Wisconsin, either you or your insurer must file an SR-22 form after certain moving violations like DUI or driving without insurance. While the SR-22 itself doesn't affect your rates, the infractions necessitating it can lead to higher premiums.
For those in need of SR-22 coverage, the two most affordable options are Western National at an annual rate of $296 and American Family at $418. These companies offer the cheapest state minimum coverage for drivers with a DUI on record.
If you don't own a vehicle but still require SR-22 certification, the two cheapest non-owner car insurance providers are Auto-Owners with a yearly rate of $287 and State Farm at $301.