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Quarterly Interest Rate





Interest continues to accrue until paid in full. Interest is calculated as follows:

July 1, 2018, through Sept. 30, 2018

  • 7.75% interest compounded quarterly


April 1, 2018, through June 30, 2018

  • 7.50% interest compounded quarterly


Jan. 1, 2018, through March 31, 2018

  • 7.25% interest compounded quarterly


July 1, 2017, through Dec. 31, 2017

  • 8.75% interest compounded quarterly for Oil and Gas Production
  • 4.75% 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

Jan. 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

Jan. 1, 2016, through Dec. 31, 2016
  • 4% simple interest

Jan. 1, 2014, through Dec. 31, 2015
  • 3.75% simple interest

Oct. 1, 2007, through Dec. 31, 2013
  • 11% interest compounded quarterly

July 1, 2006, through Sept. 30, 2007
  • 11.25% interest compounded quarterly

Oct. 31, 1991, through June 30, 2006
  • 11% interest compounded quarterly

July 1, 1982, through Oct. 30, 1991
  • 12% simple interest