Arielle M. Borsos
Caplin & Drysdale
Arielle M. Borsos Associate

P: (202) 862-5097

F: (202) 429-3301

Washington, D.C. Office


Ms. Borsos counsels individuals and corporations on matters involving inbound U.S. and outbound international tax and tax controversies.  Illustrations of her legal services, include:

  • represent individuals and companies at the examination and appeals stage with respect to both domestic and international tax issues;
  • advise U.S. citizens with offshore accounts concerning their U.S. tax obligations and various matters in the international enforcement arena, including offshore voluntary disclosure;
  • assist clients in sensitive civil tax examinations by the IRS where fraud or substantial penalty issues may arise; and
  • counsel clients on planning for pre-immigration and expatriation, with particular emphasis on efficiently structuring cross-border investments.

Professional Activities

  • Member, American Bar Association, Tax Section

Practice Area(s)

Awards & Rankings

  • Nolan Fellowship, American Bar Association, Section of Taxation, 2019-2020
  • Super Lawyers, Rising Star, Washington, D.C., 2019
  • The American Lawyer's Global Legal Award, Global Dispute of the Year: Investigations, Swiss Tax Settlements, 2015

Recent News

Recent Speaking Engagements

  • Panelist, Important Developments in Civil and Criminal Tax Penalties: Sentencing Guidelines, 2019 ABA Section of Taxation May Meeting, May 11, 2019
  • Moderator, The APA in the Era of Tax Reform, 2019 ABA Section of Taxation May Meeting, May 10, 2019
  • Moderator, Navigating Cross-Border Discovery Issues and the GDPR, ABA Section of Taxation, 2019 ABA Midyear Meeting, January 18, 2019
  • Panelist, New Law, New Regulations, New Practitioners: Legal and Ethical Obligations When Advising Taxpayers in an Uncertain Legal Environment, ABA Section of Taxation, December 19, 2018
  • Panelist, Effectively Managing IRS Audits, International Tax Dispute Resolution & Litigation Summit, November 29, 2018
  • Moderator, Post-Mayo Jurisprudence: Challenging Regulations After Mayo, American Bar Association, 2018 Fall Tax Meeting, October 5, 2018
  • Moderator, The Gathering Storm: Grappling with the Impact of Restitution Orders on Civil Tax Litigation, 2018 ABA Section of Taxation May Meeting, May 11, 2018
  • Speaker, A Birdie and a Bogey: Taxation of Foreign Athletes and Two Very Different Cases Involving Professional Golfers, American Bar Association, The Day After Tax Day, April 16, 2015

Click here for a full list of speaking engagements.

Recent Publications

Click here for a full list of publications.


  • LL.M., New York University School of Law, 2016
  • J.D., New York University School of Law, 2013, Executive Editor, Journal of Legislation and Public Policy
  • B.A., Washington University in St. Louis, 2010, with College Honors, Lambda Alpha Anthropology Honorary

Bar and Court Admissions

  • New York
  • District of Columbia
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