In every case, any tax not paid on or before the due date shall bear interest at the tax interest rate as defined in KRS 131.010(6) from the date due until the date of payment.
KRS § 136.630, under CORPORATION AND UTILITY TAXES.
KRS § 136.630
In every case, any tax not paid on or before the due date shall bear interest at the tax interest rate as defined in KRS 131.010(6) from the date due until the date of payment.