Thorsteinssons LLP > Toronto, Canada > Firm Profile

Thorsteinssons LLP

Canada > Tax Tier 1


Founded in 1964 by Pat Thorsteinsson KC, Thorsteinssons has grown into Canada’s pre-eminent law firm dealing exclusively with tax matters. With offices in Toronto and Vancouver, Thorsteinssons is Canada’s largest firm specializing in taxation and the firm’s lawyers are consistently recognized as leading tax practitioners in Canada and around the world.


Areas of practice


Thorsteinssons serves a broad range of Canadian and international clients. The firm’s clients include public and private corporations, domestic and offshore trusts, high net-worth individuals, charitable organizations and all levels of government. The practice encompasses all aspects of federal and provincial income and commodity tax matters, while the firm’s lawyers are involved in both domestic and international tax planning. Thorsteinssons’ litigators practice both civil and criminal litigation and appear before all levels of provincial and federal courts, including the Supreme Court of Canada.


Languages spoken


English, French.


International groupings


International Bar Association


International Fiscal Association.


Department Name Email Telephone
Corporate tax advice and planning Paul Gibney (Toronto)
Corporate tax advice and planning John Gregory (Vancouver)
International taxation Michael Colbourne (Toronto)
International taxation Michael McLaren (Vancouver)
Wealth management James Murdoch (Toronto)
Wealth management John Gregory (Vancouver)
Resource tax Michael Colbourne (Toronto)
Resource tax Ian Gamble (Vancouver)
Investment funds Colin Smith (Toronto)
Investment funds David Thompson (Vancouver)
Tax-exempt organizations Colin Smith (Toronto)
Tax-exempt organizations David Baxter (Vancouver)
Sales tax, GST and HST Terry Barnett (Toronto, Vancouver)
Sales tax, GST and HST Rosemary Anderson (Toronto, Vancouver)
Customs and international trade Michael Colbourne (Toronto)
Customs and international trade Rosemary Anderson (Vancouver)
Taxpayer representation Matthew Williams (Toronto)
Litigation Matthew Williams (Toronto)
Photo Name Position Profile
Michael Colborne photo Michael Colborne Partner
Matthew Williams photo Matthew Williams Partner
Number of Lawyers : 51
  • Tax