Except as otherwise specifically provided by law, whenever interest is charged under any law of this state upon any delinquent or unpaid taxes levied or imposed by the state of Kansas or any taxing subdivision thereof, or whenever interest is allowed under any law of this state upon any overpayment of taxes levied or imposed by the state of Kansas or any taxing subdivision thereof, the rate thereof shall be the underpayment rate per annum prescribed and determined under paragraph (2) of subsection (a) of section 6621, without regard to subsection (c) thereof, of the federal internal revenue code, as in effect on September 1, 1996, and which rate is in effect thereunder on July 1 of the year immediately preceding the calendar year for which the rate is being annually fixed hereunder, plus one percentage point, if computed annually. Beginning on January 1, 2012, the rate for property tax delinquencies or underpayments of $10,000 or more shall be as provided for under this section or 10% per annum, whichever is greater.

In the event the interest rate prescribed under this section cannot be determined by reference to section 6621 of the federal internal revenue code, as in effect on September 1, 1996, the rate at which interest shall be collected on underpayments shall be the rate prescribed by Kan. Stat. Ann. § 16-204, and amendments thereto, for interest on judgments for the applicable period.