Bill has practiced public accounting since 1997. He specializes in tax consulting and compliance services, including state income and franchise tax, sales and use tax, excise taxes, and incentives. Bill assists clients with mergers and acquisitions, state tax planning, credit studies, incentive negotiation, and state audit controversy consulting. He is a Certified Member of the Institute for Professionals in Taxation.

Bill has served as an expert witness in court cases addressing state and local tax matters and has lectured on state and local tax. He has also consulted with state legislators and drafted numerous bills addressing tax matters, such as the development of tax incentives to promote the expansion of datacenters and repealing the taxation of software. While he has addressed state tax matters in a wide range of industries, Bill has significant experience in the energy, technology, health care, and retail industries.

Bill’s previous experience includes 13 years in state and local tax for both industry and Big Four accounting firms.

External Publications

  • "’Amazon’ Legislation Fails Again to Take Hold in Colorado" (Hein & Associates, March 2015)
  • "Colorado Oil & Gas Tax Update" (Hein Updates, December 2014)
  • "Sanity Returns to Software Taxation" (Denver Business Journal, May 2011)
  • "Colorado Software Sales Tax Law is a Murky Mess" (Denver Business Journal, December 2010)

Selected Speaking Engagements

  • State Issues for ASC740
    (Hein Advanced Topics Seminar, Denver, December 2016)
  • Status of State Taxation
    (Financial Executives International Meeting, Denver, November 2016)
  • State and Local Tax: Hot Topics for Oil and Gas
    (Council of Petroleum Accountants Societies, Denver, December 2014)
  • State Tax Battles for the Energy Industry
    (North American Petroleum Conference, Dallas, May 2014)
  • State Tax Update
    (AICPA Oil and Gas Conference, Denver, November 2012)

Professional Affiliations

  • Board Member, Colorado Technology Association
  • Certified Member, Institute for Professionals in Taxation
  • Member, Tax Council for the Colorado Association of Commerce and Industry
  • Member, Tax Council for the Colorado Council of Petroleum Accountants Societies


  • BA, history, Fort Lewis College
  • MA, history, University of Denver

Insights from William Mueldener