Mercury Insurance filed a request with California's Department of Insurance in May 2026 to raise private passenger auto rates by 7.4 percent statewide, according to a rate filing posted to the CDI public docket. The filing is the first major Mercury auto-rate action under California's Sustainable Insurance Strategy framework since the carrier reopened its California new-business pipeline in late 2025.
The Sustainable Insurance Strategy, which Insurance Commissioner Ricardo Lara finalized in early 2025, gives California insurers the ability to use forward-looking catastrophe models in rate filings rather than the 20-year backward-looking historical average that California regulators previously required. Mercury General Corporation cited reinsurance cost escalation following the January 2025 Los Angeles wildfires as a central driver in its filing, along with continued bodily injury severity growth and elevated total-loss payouts.
Why Mercury Is Seeking a 7.4 Percent Increase
Mercury's actuarial submission to the CDI identifies three cost pressures. First, the carrier's reinsurance program for California catastrophe exposure renewed at substantially higher premiums following the $40 billion in insured wildfire losses that hit Southern California in January 2025, according to figures published by the Insurance Information Institute. Although reinsurance costs attach most directly to homeowners coverage, Mercury's California auto book shares administrative and overhead costs with its property lines, creating indirect upward pressure on the auto book.
Second, bodily injury severity in California continued to climb in 2025. Mercury cited an 11 percent year-over-year increase in average bodily injury settlements within the state, above the 8 percent national trend documented by the Insurance Research Council in its 2025 Auto Injury Study. California's attorney representation rate in auto injury claims, which the Insurance Research Council puts at 73 percent compared with 54 percent nationally, continues to drive per-claim costs above the national average.
Third, Mercury pointed to vehicle replacement costs. Total-loss claims paid by the carrier in California rose 14 percent over the prior 12 months, driven by sustained high transaction prices for new vehicles and elevated used-vehicle values that keep replacement payouts high.
The CDI will review Mercury's filing under Proposition 103 procedures, which require the department to determine whether the requested rate is adequate, not excessive, and not unfairly discriminatory. Consumer intervenors have 45 days to formally request a hearing once CDI staff complete their initial actuarial review.
What the Sustainable Insurance Strategy Changes
Before the SIS, California insurers could not use forward-looking catastrophe loss models, independent reinsurance costs, or projected inflation trends in their rate filings. Carriers were required to rely solely on historical claims experience. In the aftermath of the 2017-2021 wildfire catastrophe years, that backward-looking requirement frequently produced rates that were actuarially insufficient. The resulting combination of inadequate rates and escalating wildfire exposure drove several major carriers to pause or restrict California private-passenger writing.
Under the SIS, insurers that agree to maintain or expand writing in distressed California markets, including high wildfire-risk ZIP codes and the California FAIR Plan coverage layer above standard market, may use modern actuarial tools in their rate submissions. Mercury was among the carriers that filed compliance commitments to access the new ratemaking tools, according to CDI records. Mercury's 7.4 percent auto filing follows the standard Prop 103 prior-approval path, reviewed separately from any homeowners filings.
What California Drivers Can Expect
Mercury writes private passenger auto coverage across all 58 California counties and holds approximately 8 percent of the California auto insurance market, according to market share data from the California Department of Insurance. If approved at or near the requested level, policyholders would see the new premium on their first renewal after the effective date that CDI establishes in its approval order.
California law requires Mercury to deliver a renewal notice at least 30 days before any premium change takes effect, with a line-item breakdown of the new amounts. Drivers who want to evaluate competing carriers before their next renewal can request quotes from other California-licensed insurers without affecting their current Mercury policy status.