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Mark D. Olson

Of Counsel


Mark Olson’s practice concentrates on Federal tax matters. His clients include privately held businesses and their owners, individuals, and real estate owners and developers. More than forty years of tax law experience, from the Tax Reform Act of 1976 to the Tax Cuts and Jobs Act of 2017 and the many law changes in between, give Mark a range of experience and knowledge that’s rarely matched. His clients benefit through his informed, creative and proactive solutions to a wide range of tax problems and issues.


  • Advising clients on choice of entity matters, involving S corporations, limited liability companies, C corporations and Delaware statutory trusts, including planning opportunities under the Tax Cuts and Jobs Act
  • Developing creative, tax-advantaged approaches for business ownership and operational structures, including business and asset split-offs, worker classification considerations, reasonable compensation issues and employment tax problems
  • Assisting businesses in implementing and maintaining S corporation elections, including special situations – Qualified Subchapter S Trusts and Electing Small Business Trusts as stockholders, Qualified Subchapter S Subsidiaries, and strategies for dealing with accumulated earnings
  • Counseling C corporations with accumulated earnings tax and personal holding company tax issues
  • Advising real estate owners and investors in structuring complex like kind exchanges, including reverse exchanges, and build-to-suit and parking transactions
  • Devising and implementing strategies for tax-advantaged intra-family transfers of real property and business interests

Professional Affiliations

Delaware State Bar Association

  • Tax Section, Member, Past Chair
  • Trusts and Estates Section

American Bar Association

  • Section of Taxation
  • Real Property, Trust and Estate Law Section


Latest Blog Posts

News & Events



Estate Planning Council of Delaware
Wilmington Tax Group
Meeting Ground, Inc., Board of Directors, 2009 – 2012
More Light Presbyterians, Board of Directors, 2015 – Present
New Castle Presbytery of the Presbyterian Church (U.S.A.)

  • Chair of Presbytery Council, 2015 and 2017
  • Vice Moderator, Moderator, 2013 - 2014
  • Trustees, 1999 - 2005, 2009 - 2012



Corporate INTL Tax Planning - Law Firm of the Year, 2018

Best Lawyers®, 2011-2018

Best Lawyers®, 2016 and 2018 "Lawyer of the Year" for Tax Law

Martindale-Hubbell®, AV Rating

T 302.888.5211
F 302.571.1750


Delaware, 1976

U.S. Tax Court

U.S. Supreme Court


University of Pennsylvania Law School, J.D., 1976

State University of New York at Binghamton, B.A., 1973

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