FacultyFaculty/Author Profile

William P. O'Shea

Deloitte Tax LLP
Director, Passthroughs
Washington, DC, USA


William P. O'Shea is a Director in the Washington National Tax Office of Deloitte Tax LLP. He was the Associate Chief Counsel, Passthroughs and Special Industries, Office of Chief Counsel, IRS, before joining Deloitte in 2008. In that capacity, he was the executive in charge of all passthrough taxation issues. His division of ninety attorneys was responsible for drafting regulations, all other published guidance, and litigation technical arguments for all passthrough issues.  Mr. O'Shea has been doing passthroughs taxation for more than twenty five years.  Mr. O'Shea worked closely for years with all the government's passthrough taxation experts at the IRS and Treasury.

In addition to being in charge of partnership and S corporation issues, he handled other areas, such as trusts (including fixed investment trusts), energy credits, and entity classification. 

Mr. O'Shea has been actively involved with check-the-box entity classification issues including disregarded entities and late entity election relief. For the government, he handled all the publicly traded partnership regulations and issues since the PTP enactment in 1987. Mr. O'Shea also handled passive activity losses, the at-risk rules, and tax shelters. 

Mr. O'Shea has spoken at many of the country's leading tax conferences including the ABA, AICPA, Practicing Law Institute, Federal Bar, New York University Institute on Federal Tax, DC Bar, and Federal Real Estate Conferences. Mr. O'Shea has received numerous awards including IRS Commissioner Awards, The Chief Counsel Award, and Special Achievement Awards from the Office of Chief Counsel, IRS.

Mr. O'Shea is an attorney admitted to practice law in Massachusetts. He attended Boston College Law School where he was a teaching assistant for Contracts, a member of Law Review, and in the top ten percent of his class. He has taken more than twenty New York University Law School tax courses. He received his BA with honors in Political Economy from the University of Massachusetts. He is a graduate of the Executive Management Program at Georgetown University.

Although not a CPA, in 2009, Mr. O'Shea was appointed to the AICPA committee on partnership taxation.

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