Gretchen Sierra

Washington National Tax | International Tax Group

Principal | Deloitte Tax LLP

Gretchen Sierra

555 12th Street NW

Suite 400



United States


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Gretchen advises US and foreign-based multinationals on a broad range of international tax matters, including supply chain structuring, IP migrations, US income tax treaties, inbound planning, financing transactions, cross-border mergers and acquisitions, and e-commerce transactions. In addition to client service, Gretchen was previously the managing principal of the International Tax Group and dean of the Deloitte Tax Inclusion Summit. She is also a member of the Deloitte Tax Cryptocurrency Working Group.

Prior to joining Deloitte, Gretchen was deputy international tax counsel in the Office of Tax Policy of the US Department of the Treasury. In that role, she had responsibility for a broad spectrum of US tax treaty and international tax regulatory and legislative matters, including the contract manufacturing regulations. She was also previously legislation counsel for the Joint Committee on Taxation of the US Congress.

Gretchen is an adjunct professor at Georgetown University Law Center, an advisory committee member for the annual institute on current issues in International Tax at The George Washington University School of Law, and an advisory board member to the US Branch of the International Fiscal Association (IFA). She is a frequent speaker at national conferences including those sponsored by International Fiscal Association, American Bar Association Tax Section, Practising Law Institute, and Organization for International Investment. She is also a co-author of the Bloomberg/BNA Tax Management Portfolio Outbound Tax Planning for US-Based Multinational Corporations, No. 6380.

Gretchen received her bachelor of arts in comparative literature from University of Iowa and juris doctor from University of Iowa College of Law, where she was the senior articles editor for the Iowa Law Review.

Gretchen Sierra