William C. Benjamin

Retired Partner

Benjamin, William C.

William C. Benjamin was a partner in the firm's Corporate and Transactional Department, and the Tax and Fund Formation Practice Groups. He was also co-chair of the firm's International Transactions Group. He joined the firm in 1982 and retired in 2012.

Mr. Benjamin has more than 30 years of experience advising clients on the legal and tax aspects of international business transactions. He has represented US companies in connection with their activities outside the United States, and foreign businesses and individuals with respect to their activities in the United States. He provided tax advice with respect to cross-border transactions of all kinds. He also assisted businesses and individuals with tax compliance matters and tax controversies. Mr. Benjamin drew on an extensive network of contacts throughout the world.

Honors & Awards

  • Recognized as a Massachusetts leader in the area of tax law in Chambers USA: America's Leading Lawyers for Business, 2005-2012 editions
  • Named the 2013 Boston "International Trade and Finance Law Lawyer of the Year" by The Best Lawyers in America
  • Selected by peers for inclusion in The Best Lawyers in America, in the area of international trade and finance law (2006, 2008, 2009, 2010, 2012, 2013) and tax law (2008, 2009, 2010, 2011, 2012, 2013) 

Publications & News


February 19, 2013

Six WilmerHale Attorneys Named by Best Lawyers as “Lawyer of the Year” in 2013

October 31, 2012

IRS Extends Timeline for Due Diligence and Other Requirements Under FATCA—Implications for Private Investment Funds

On October 24, 2012, the Internal Revenue Service (“IRS”) issued Announcement 2012-42 (the “Announcement”), which further extends the timeline for completion of certain due diligence and other requirements and provides additional guidance concerning gross proceeds withholding and the status of certain instruments as grandfathered obligations under Sections 1471 through 1474 of the Internal Revenue Code (commonly referred to as the “Foreign Account Tax Compliance Act” or “FATCA”).

June 7, 2012

Chambers USA 2012 Final Results Announced

June 6, 2012

FBAR Deadline is June 29, 2012; IRS Form 8938 May Also Be Required

March 30, 2012

Chambers USA 2012 Preliminary Results Announced

February 24, 2012

Impact of Proposed FATCA Regulations on Private Investment Funds

July 21, 2011

IRS Extends Deadlines for FATCA Compliance

The Internal Revenue Service has issued guidance that extends various deadlines for compliance with certain withholding, reporting and other obligations under FATCA beyond the statutory deadline of January 1, 2013. This Client Alert discusses the extended compliance deadlines addressed in the guidance that are relevant to private investment funds.

June 17, 2011

Extension of FBAR Deadline for Employees of Registered Investment Advisors Until June 30, 2012

June 16, 2011

Extension of FBAR Deadline for Certain Filers Until November 1, 2011

June 2, 2011

IRS and FinCEN Extend FBAR Filing Deadline for Certain Officers and Employees with Signature Authority Only

Professional Activities

Mr. Benjamin was a member of the New England Regional Council of the International Fiscal Association. He was also a member of the Editorial Advisory Board of Practical U.S./International Tax Strategies, and a member of the International Bar Association, the American Bar Association and the Massachusetts Bar Association. Mr. Benjamin is a former co-chair of the International Tax Committee of the Boston Bar Association.
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JD, cum laude, Harvard Law School, 1973

Graduate Institute of International Studies, Geneva, 1970, Fulbright Scholar

BA, summa cum laude, Princeton University, 1969, Phi Beta Kappa

Bar Admissions


New York

United States Tax Court



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