Marc K. Sellers


Marc Sellers helps clients resolve “make or break” civil and criminal tax issues in state and federal courts. In his 36-year career he has obtained successful results for hundreds of clients, including the first award of attorney fees against the Internal Revenue Service under the IRS Restructuring and Reform Act of 1998.

Marc represents clients in tax and related financial cases before the United States Tax Court, the U.S. District Courts in Oregon, Washington and California,, the U.S. Court of Appeals for the Ninth Circuit and the U.S. Court of Federal Claims, and state courts. He also assists clients with a wide variety of tax matters before administrative agencies in Oregon, Washington and California. 

In addition to his tax controversy and litigation work, since 1980 Marc has as also practiced as a tax planning and transactional tax attorney. The combination of these two distinct, but related, areas of tax practice enable him to understand the business aspects of tax controversies and offer unique, creative solutions.

Marc’s practice also encompasses non-tax controversies involving import-export regulations, environmental laws, the Endangered Species Act, RICO and white-collar criminal controversies. 



  • Representation of individuals and business entities in the United States Tax Court and the Oregon Tax Court.
  • Representation of taxpayers in refund litigation in state and federal courts.
  • Representation of taxpayers in criminal tax investigations and criminal tax litigation.
  • Property tax valuation and exemption cases in the Oregon Tax Court.
  • Administrative representation of taxpayers before the Internal Revenue Service and state taxing agencies in areas including:

-Appeals of proposed tax deficiencies.
-Tax collection disputes.
-Applications for Innocent Spouse and Injured Spouse  relief.
-Offers in Compromise.
-Installment payment arrangements.
-Taxation of settlement awards and judgments in civil  litigation.
-Taxation of spousal separation awards and settlements.

  • Represented clients before other federal administrative agencies, including the Bureau of Alcohol, Tobacco and Firearms; the Environmental Protection Agency; the Department of Homeland Security and others.
  • Represented clients as plaintiffs in prosecuting defendants for racketeering, the unauthorized practice of law and identity theft matters.

Memberships & Awards


  • Chairman, Section of Taxation, Oregon State Bar, 2007
  • President, Beaverton Rotary Club, 1998-1999


  • Award of Merit, Oregon State Bar Taxation Section, 2016
  • AV Preeminent Peer Review Rated with Martindale-Hubbell® since 1987
  • AV Preeminent Peer Review Rated with Martindale-Hubbell® 20-year recognition
  • Best Lawyers in America 2012, "Tax Lawyer of the Year - Tax Litigation and Controversy"
  • John L. Schwabe Client Service Award, 2010
  • Best Lawyers in America: Tax Litigation and Controversy & Tax Law (2006-2023)
  • Oregon Super Lawyers, Tax (2006-2022)
  • Rotarian of the Year, Beaverton, Oregon Rotary, 1994
  • Beaverton Rotary Paul Harris Fellowship Award, 1992

Resources & Ideas

Seminars & Speaking Engagements

Community Activities

Community Activities

  • Portland Mountain Rescue, Member (1984-1990)
  • Beaverton, Oregon Rotary Club, Member (1987-2013)




Oregon State Courts

California State Courts

Washington State Courts

United States Court of Appeals, Ninth Circuit

United States Court of Appeals, Federal Circuit

United States Court of Federal Claims

United States District Court, District of Oregon

United States District Court, Central District of California

United States District Court, Eastern District of California

United States District Court, Northern District of California

United States District Court, Southern District of California

United States District Court, Eastern District of Washington

United States District Court, Western District of Washington

United States Tax Court

United States Supreme Court

Outside The Office