William F. Colgin Jr. primarily represents corporate taxpayers in complex civil tax controversies and tax litigation. Bill litigates in the US Tax Court, federal district courts, state courts, and appellate courts. He represents clients in Internal Revenue Service (IRS) examinations and appeals, and in similar proceedings before state taxing authorities. He began his tax litigation career as a trial attorney in the Tax Division of the US Department of Justice, representing the IRS.
Bill has experience with numerous tax controversies and hundreds of docketed cases. He is involved with complex examinations, numerous IRS Appeals negotiations, multistate coordinated resolutions of state tax issues, anonymous IRS disclosure disputes, Freedom of Information Act (FOIA) requests, and many other types of administrative procedures.
His cases and controversies typically involve high dollar amounts and tend to involve international tax, transfer pricing, intellectual property, economic substance, and other high-profile areas of tax dispute. He works with clients in many industries including high technology, semiconductor, medical device, pharma, and financial services. He often teams with Morgan Lewis’s partners in other practice groups to help solve issues that involve multiple disciplines in addition to tax.
Bill works with experts in a variety of disciplines including intellectual property, economics, transfer pricing, manufacturing, accounting, stock options, valuations, finance, and banking.
Bill’s SALT cases have involved class action, Qui Tam, and False Claims Act suits involving state-specific and multistate issues at the state trial, appellate and supreme court levels, as well as federal courts. He has also managed complex, large dollar multistate controversies to successful resolution. SALT tax types include income, payroll, business, employment, franchise, sales, and transfer taxes.
Bill frequently speaks on tax litigation and controversy issues. He was previously vice chair of the executive committee of the Taxation Section of the State Bar of California, and has been active in other bar associations.
University of Denver College of Law, 1992, J.D.
University of Wyoming, 1989, M.A.
University of Wyoming, 1987, B.A.
U.S. Tax Court
U.S. Court of Federal Claims
U.S. Courts of Appeals for the First, Fifth, Sixth, Seventh, and Ninth Circuits
U.S. Court of Appeals for the District of Columbia
U.S. District Court for the District of Nebraska
U.S. District Court for the Northern District of California
Awards and Affiliations
Member, Practice Group of the Year, Tax, Law360 (2017)
Ranked, Chambers USA: America's Leading Lawyers for Business (2008–2017)
Recommended, Tax – US Taxes – Contentious, The Legal 500 US (2011–2015, 2017)
Recognized, Who’s Who Legal (2016)
Past Vice Chair, Executive Committee, Taxation Section, California Bar
Past Director, Tax Court Pro Se/Pro Bono Program, San Francisco, California
Past Chair, Technology Subcommittee, Court Practice and Procedure Committee, Tax Section, American Bar Association
Outstanding Volunteer in Public Service Awards, Bar Association of San Francisco (2001–2003, 2011–2013)
Morgan Lewis Pro Bono Challenge Award (2006–2013)
Volunteer of the Month, San Francisco Bar Association (July 2007)
Outstanding Trial Attorney Award, Tax Division, US Department of Justice (1996)