Which insurance rating law allows insurers to file rates with the state before using them?

The concept of "file and use" refers to a regulatory framework that allows insurance companies to file their proposed rates with the state insurance department and then implement those rates before receiving formal approval. This method is designed to streamline the rate approval process, enabling insurers to respond more swiftly to market conditions and potentially adjust their rates based on competitive factors and loss experience.

In this system, after filing the rates, the state insurance department may review the filing for compliance with regulatory standards, ensuring that the rates are not discriminatory and are actuarially sound. However, the insurer does not need to wait for a lengthy approval process before applying the rates to their policies, allowing for greater flexibility and responsiveness in pricing.

This approach contrasts with other methods, like "file and approval," where insurers must receive prior approval from the state before using any new rates. The other options do not directly refer to the filing process that allows immediate use of filed rates, which is why "file and use" is the correct answer.