OK HB2730

Changes the interest rate on delinquent state taxes from a fixed 1.25% per month (15% annual) to a variable annual rate based on Wall Street Prime as of January 1 plus three percentage points

Changes the interest rate on underpayment of estimated taxes from a fixed 20% annual rate to Wall Street Prime plus three percentage points

Retains existing penalty structures: 10% penalty for sales/use/motor fuel taxes unpaid within 15 days of delinquency, 10% penalty for other taxes unpaid within 30 days, 25% penalty for negligence, and 50% penalty for fraud

New interest rates apply to all delinquencies occurring on or after the effective date and to any existing delinquent accounts

Effective date: November 1, 2026