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William Bies Toronto Lawyer

William J. Bies

Partner Fasken
Understanding potential tax consequences is essential to realizing the full value of an investment.
Jurisdiction Ontario, 1976
Language(s) English
Office(s) Toronto


Bill Bies’ general corporate tax practice is concentrated on domestic and international M&A, as well as corporate finance and reorganizations. Advising clients on cross-border and international tax, Bill assists non-residents to enter the Canadian market and provides advice to Canadian companies wishing to operate abroad. Bill is also involved in personal tax and estate planning. A considerable portion of Bill’s practice involves dispute resolution with the Canada Revenue Agency and in the Courts.

Bill has acted for numerous high-profile corporations. With clients that include E. I. du Pont, ESPN, DeBeers Canada, Credit Suisse, The Bank of Nova Scotia, Colgate-Palmolive, MDS Inc., Rogers Communications Inc., Dofasco, Canadian Pacific Railway, and Walt Disney, Bill provides crucial advice on the rules governing taxation in Canada. Previously acting as the vice-chair of the firm’s Toronto Business Law practice group, he has also held the position of director of the Tax practice group.

Frequently advising clients on crucial, tax-effective strategies, Bill is a sought-after expert on corporate income tax and international tax. He was a professor at Laval University in Quebec City for two years and was an adjunct professor at the University of Toronto’s Law School for more than 20 years. He is a frequent speaker at conferences and seminars, presenting on topics ranging from international transfer pricing, interest deductibility and financing costs, to the tax treatment of hybrid instruments.

Bill has been recognized by Chambers Global and by The Lexpert/American Lawyer Guide to the Leading 500 Lawyers in Canada for his corporate tax expertise. He is a Member of the Canadian Tax Foundation, the International Bar Association and Canadian Bar Association.


  • Recognized in Tax Law in Toronto, The Best Lawyers in Canada 2006 to 2022
  • For Tax Law, The Best Lawyers in Canada 2006 to 2018
  • As one of the leading 79 tax lawyers in Canada for 2009, 2009

Client Work

Date Client

Career & Education


  • LLM City, University of London
  • LLB University of Windsor

Memberships & Affiliations

  • Member, Canadian Bar Association
  • Member, Canadian Tax Foundation
  • Member, Ontario Bar Association
  • Member, International Bar Association
  • Member, International Fiscal Association
  • Member, Canadian Petroleum Tax Association
  • Member, CBA/CICA Joint Committee on Taxation (Past)
  • Special Lecturer, Graduate Law Program, Osgoode Hall Law School, Toronto (Past)
  • Special Lecturer, Faculty of Law, University of Toronto, Toronto (1979-2004)
  • Assistant Professor, Faculty of Law, Laval University, Québec City (1972-1974)



Speaking Engagements

Federated Press Conference: Taxation of Corporate Reorganization location location Toronto


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