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Thorsteinssons LLP

Thorsteinssons LLP is Canada’s largest law firm practicing exclusively in taxation law. Our lawyers are consistently recognized as being among Canada’s leading tax practitioners.

Thorsteinssons LLP was founded in Vancouver in 1964 by P.N. (Pat) Thorsteinsson. In 1990, the firm expanded by opening a Toronto office in order to better serve its national client base. We were then, and continue to be, Canada’s only national tax law firm.

Tax is an area of great complexity. By restricting our practice to tax, we are better able to deliver the level of skill demanded by our clients. Our practice encompasses all aspects of taxation including tax planning and restructuring, tax litigation at all court levels, and advice on compliance obligations.

We provide tax advice of the highest quality to clients around the world and are known for our skillful work in highly complex matters. Our close client relationships afford us the in-depth knowledge of client businesses that is necessary to deliver the advice that our clients require. Our goal throughout is to provide our clients with valuable solutions in a timely and efficient manner.

Working together, we share an uncompromising commitment to excellence in everything we do.


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  • Canada

    • Toronto ON

      33rd Floor, Brookfield Place Bay Wellington Tower, 181 Bay Street PO Box 786, Toronto ON M5J 2T3, Canada
      T 1 416 864 0829
      F 1 416 864 1106
    • Vancouver BC

      27th Floor, Three Bentall Centre, 595 Burrard Street PO Box 49123, Vancouver BC V7X 1J2, Canada
      T 1 604 689 1261
      F 1 604 688 4711