Employment security: administration; assessment of penalties, interest, or fees on certain unpaid restitution of benefit overpayments; prohibit. Amends sec. 15 of 1936 (Ex Sess) PA 1 (MCL 421.15).

HB 5375 prohibits charging interest on unpaid restitution of overpaid unemployment benefits when the overpayment resulted from specific errors, such as agency mistakes, employer errors, or system issues - not the claimant's fault. It requires the unemployment agency to waive existing interest charges and refund payments made for those errors, with refunds due within 180 days of the law's effective date. The bill also stops interest from accruing during pending appeals and applies retroactively to overpayments from February 2020 through December 2026. This directly affects claimants who received overpayments due to errors beyond their control.