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Quarterly Interest Rate



Interest continues to accrue until paid in full. Interest is calculated as follows:
July 1, 1982 through October 30, 1991
  • 12% Simple Interest
October 31, 1991 through June 30, 2006
  • 11% interest compounded quarterly
July 1, 2006 through September 30, 2007
  • 11.25% interest compounded quarterly
October 1, 2007 through December 31, 2013
  • 11% interest compounded quarterly
January 1, 2014 through December 31, 2015
  • 3.75% simple interest
January 1, 2016 through December 31, 2016
  • 4% simple interest rate
January 1, 2017 through March 31, 2017
  • 8.25% interest compounded quarterly for Oil and Gas Production
  • 4.25% simple interest for all other tax types

April 1, 2017 through June 30, 2017

  • 8.50% interest compounded quarterly for Oil and Gas Production
  • 4.50% simple interest for all other tax types

July 1, 2017 through December 31, 2017

  • 8.75% interest compounded quarterly for Oil and Gas Production
  • 4.75% simple interest for all other tax types

January 1, 2018 through March 31, 2018

  • 7.25% interest compounded quarterly

April 1, 2018 through June 30, 2018

  • 7.50% interest compounded quarterly