An SR-22 is not a type of car insurance but a certificate proving you meet Minnesota's minimum coverage requirements after certain moving violations. It's filed by you or your insurer, and while the SR-22 form itself doesn't affect rates, the violations leading to its requirement can raise your premiums noticeably.
For drivers needing SR-22, the two most affordable minimum coverage options are Western National at an annual rate of $510 and State Farm with an annual premium of $559. When it comes to non-owner car insurance for drivers required for an SR-22, the two cheapest options are Auto-Owners at $310 per year and State Farm at $449 per year.