Insurance: other; underwriting transparency; provide for. Amends 1956 PA 218 (MCL 500.100 - 500.8302) by adding sec. 2229.

SB 545 requires Michigan auto and homeowners insurers to provide clear, written explanations to policyholders when making significant changes to their coverage or rates (like increases over 10%, cancellations, or reduced coverage). It mandates that notices explain the specific factors driving the change - such as driving history or property risks - instead of vague terms like "poor loss history" or "internal models." Policyholders can request written details, and insurers must share these notices with their insurance agents under certain conditions. The law applies to policies issued after January 1, 2026, and does not replace existing cancellation notice requirements.