An SR-22 isn't car insurance but a certificate of financial responsibility you might need after a driving violation. You or your insurer files it to prove you have liability coverage. Though the form doesn’t raise your rates, the violations requiring an SR-22 can increase your premiums.
Mercury offers the cheapest SR-22 minimum coverage at $411 per year, followed by American Family at $485 annually. For non-owner SR-22 insurance, Auto-Owners is the most affordable at $319 per year, followed by State Farm at $383 annually.