Mary A. McNulty

Mary A. McNulty

  • 214.969.1187
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  • Thompson & Knight LLP
    One Arts Plaza
    1722 Routh Street, Suite 1500
    Dallas, TX 75201 USA
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Mary McNulty represents taxpayers in IRS audits, appeals, and tax litigation, with emphasis on Federal tax procedural issues and partnership audits. She has significant expertise in partnership tax issues relating to private equity, energy, real estate, and exempt organizations.

Mary is the "go-to attorney for boutique, complicated issues" and "a great controversy lawyer," according to clients quoted by Chambers USA. She is a Recommended Attorney in The Legal 500 US and an “expert in federal tax procedures and partnership tax matters.”


  • Represents large partnerships and public companies in IRS audits and appeals involving oil and gas and energy tax issues, financial products issues, worthless losses, and procedural issues, including statutes of limitations, penalties, and interest

  • Represents large public companies in IRS audits and appeals involving oil and gas and energy tax issues, partnership procedural and tax issues, excise taxes, foreign tax credits, statutes of limitations, penalties, and interest

  • Represents large public companies in tax litigation involving interest on federal tax refunds and deficiencies

  • Represented large public company during IRS audit involving partnership and corporate acquisition issues

  • Represents general partners of energy funds in structuring funds and making portfolio investments

  • Represents private foundations, pension plans, and other tax-exempt organizations making oil and gas, real estate, and other partnership investments

  • Represented large public company in refund suit and appeal involving deductibility of payments made to the Agent Orange settlement fund

  • Represented large public oil and gas companies in cases involving transfer pricing, excise taxes, and windfall profit taxes

  • Represented tax professional in tax shelter promoter investigations

  • Represented families in litigation and IRS appeals in estate and gift tax valuation cases


  • Top 50 Female Attorneys in Texas, Texas Super Lawyers® by Thomson Reuters; 2014-2016, 2018

  • Top 100 Dallas/Fort Worth Region, Texas Super Lawyers® by Thomson Reuters; 2014-2016

  • Top 100 Overall, Texas Super Lawyers® by Thomson Reuters; 2016

  • Dallas Litigation & Controversy - Tax "Lawyer of the Year," The Best Lawyers in America® by Woodward/White Inc.; 2014, 2016

  • The Best Lawyers in America® by Woodward/White Inc. (Litigation & Controversy-Tax, Tax Law); 2006-2019

  • Chambers USA by Chambers & Partners (Tax, Tax: Litigation); 2009-2018

  • "Leading Lawyer," The Legal 500 US by Legalease (Tax: U.S. Taxes: Contentious); 2018

  • “Recommended Attorney,” The Legal 500 US by Legalease (Tax: Domestic Tax; Tax: Tax Controversy; Tax: U.S. Taxes: Contentious); 2015-2018

  • Texas Super Lawyers® by Thomson Reuters (Tax); 2003-2018

  • Tax Directors Handbook, The Essential Guide to the World’s Premier Tax Law Firms; 2014

  • Best Lawyers in Dallas (Tax: Litigation), D Magazine; 2007-2008, 2011-2015, 2017-2018

  • Best Business Lawyers in Dallas (Tax), D Magazine; 2009

  • The Best Lawyers in Dallas Under 40, D Magazine; 2002

  • Fellow, American Bar Foundation

  • Fellow, Texas Bar Foundation

  • Thompson & Knight LLP Dallas Office Mentoring Award; 2002

  • Martindale-Hubbell AV Preeminent Rating

Activities (Memberships/Affiliations)

  • Member, American Bar Association; Tax Section; Council, 2012-2016; Chair, Committee on Appointments to the Tax Court, 2015-2018, Vice-Chair, 2013-2015, Member, 2007-2019; Nominating Committee, 2007-2010; Committee on Government Submissions, 2007-2015; Chair and Vice-Chair, Court Procedure & Practice Committee, 2001-2007; Advisory Panel, 2006-2011

  • Member, State Bar of Texas; Tax Section; Chair, 2011-2012; Vice-Chair, 2010-2011; Secretary, 2009-2010; Treasurer, 2008-2009; Council, 2005-2008; Nominating Committee, 2013-2016, 2019; Chair, Committee on Government Submissions, 2007-2008; Chair, Energy Tax Committee, 2003-2005

  • Member, Dallas Bar Association; Chair, Tax Section, 2005-2006; Vice President, 2004-2005; Secretary and Treasurer, 2003-2004; Council, 2002-2003

  • Tax Editorial Advisory Board, Law360, 2014-2019

  • Board of Advisors and Department Head, Business Entities, Current Developments, 1999-2015

  • Board of Advisors and Contributors, J. S Corp. Taxation, "Limited Liability Companies," 1995-1998

  • Board Member, The Family Place, 2017-2019

  • Board Member, Business Council for the Arts, 2014-2019; Secretary, Executive Committee, 2018-2019; Member, Executive Committee, 2014-2017; Chair, Membership Committee, 2014-2017

  • Advisory Board, Booker T. Washington High School for the Performing and Visual Arts, 2011-2014; Executive Committee, 2012-2014; Finance Committee Chair, 2013-2014

  • Chair, Finance Committee, Thompson & Knight LLP, 2013-2016
  • Management Committee, Thompson & Knight LLP, 2008-2012

  • Chair, Legal Personnel Committee, Thompson & Knight LLP, 2005-2008

  • Treasurer, Christ the King Parents' Association Executive Board, 2004-2005

  • U.S. Tax Court Judicial Conference, 2001, 2003, 2007, 2009, 2015, 2018

  • Member, American College of Tax Counsel

  • Treasurer, American Cancer Society Evergreen Gala, 1993-1995