Cincinnati Insurance has introduced updates to its Virginia personal auto program, reintroducing a book roll transition factor as part of a rate and rule filing submitted on April 9, 2026.

The update applies to private passenger auto business and is scheduled to take effect on June 1, 2026, for both new and renewal policies.

The filing centers on bringing back a previously removed rule designed to manage premium changes when policies are transferred from another insurer into Cincinnati’s book. The company had earlier removed the factor following a state objection, marking it as “reserved for future use,” and is now reinstating it to support an upcoming book roll opportunity.

The book roll transition factor is intended to smooth pricing changes for policyholders moving from a non-affiliated carrier. Instead of applying the full difference between the prior premium and Cincinnati’s calculated premium immediately, the approach phases in the change over multiple renewal periods.

The mechanism works by comparing the new Cincinnati premium to the policyholder’s prior premium and applying a factor that gradually adjusts the price over time. For example, a policy moving from $840 to $1,000 would not immediately jump to the higher premium, but instead transition across several terms until reaching the full rate.