Motors Insurance Corporation is seeking a 20.1% rate increase for its California commercial umbrella program covering auto dealers.

The Ally Insurance subsidiary’s proposal affects 64 policyholders and approximately $1.45 million in written premium. It would generate an additional $290,895 in premium, with individual increases ranging from 11% to 47%.

The company indicated that a 110.5% increase was actuarially justified.

The filing also updates the underlying auto and general liability factors used to determine umbrella premiums and simplifies the excess rating factors. The underwriting guidelines remain unchanged.

The changes are targeted to take effect on January 1, 2027, for new and renewal business.