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Our history

What's behind the Deloitte name?

In 1858 Philip S. Ross, who was already operating a successful chandlery, began to offer accounting and customs services to meet his clients’ changing needs. Over 150 years, his firm grew, through hundreds of mergers, to become Deloitte — one of the most important and respected forces in Canadian business, and the largest professional services firm in the country. Known for our leadership, innovation and integrity, Deloitte has been shaping Canadian businesses since 1858.

Our history

  • History in the making
    History in the making
    Deloitte’s Canadian roots go back 150 years. This interactive timeline tracks the evolution of our firm, along with the growth of our country and our profession.

Learn more

  • Keeping the focus on clients
    Deloitte's history lesson
  • Looking back with pride
    Helping businesses over the decades
  • A pedigree of innovation
    Combining insight and discipline
  • Read about the mergers that created today's Deloitte
    Our predecessor firms
  • Highlights from our history
    Leading in every era

Stay informed