Revenue and taxation; interest on delinquent taxes; interest on refunds; effective date.

HB 1204 modifies interest rates for unpaid taxes and refund delays in Oklahoma. It sets interest on delinquent taxes at the prime rate plus 2% (published in *The Wall Street Journal*), while changing refund interest deadlines: taxpayers get interest on refunds not paid within 90 days (for most returns), 30 days for electronic filings (2004-2010), or 45 days (2010+). The bill directly affects all Oklahoma taxpayers who owe taxes or are due refunds, including individuals and businesses. It becomes effective November 1, 2025.