Relating to: interest rates on late, nondelinquent taxes and on overpayments. (FE)

SB 1012 reduces Wisconsin's annual interest rate for late tax payments from 12% to 3% and requires the Department of Revenue (DOR) to pay 3% interest on tax overpayments. It applies to individuals and businesses filing income, franchise, and withholding tax returns, modifying multiple tax statutes to implement these rate changes. The bill adjusts when interest accrues during filing extensions, such as for corporate or pass-through entity returns, while maintaining 3% for overpayment refunds. Special provisions exempt certain disaster-related tax extensions from interest charges during and for 30 days after federal extensions.