Interest continues to accrue until paid in full. Interest is calculated as follows:
July 1, 1982 through October 30, 1991October 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, 2015January 1, 2016 through December 31, 2016January 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