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Mario Seyer

Mario Seyer

Partner, PwC Canada

Mario is the National Indirect Tax Leader of PricewaterhouseCoopers. Based in Montreal, he advises clients on GST, HST, QST, retail sales tax, customs, sales and use tax, excise tax, fuel tax and other indirect tax matters. He advises and assists clients with respect to planning and compliance issues pertaining to provincial, national and international transactions. He assists several businesses in indirect tax litigation files involving Revenu Québec or the Canada Revenue Agency.

Mario advises several clients in the financial sector: holdings, insurers, banks, intermediaries, investment funds, pension plans, investment companies and public sector investment bodies.

Mario has spoken widely on indirect tax matters to professional or business groups or associations, including the Tax Executive Institute, the Association de planification fiscale et financière (apff – Symposium, annual conference), CPA Canada (Symposium), l'Ordre des comptables professionnels agréés du Québec, the Canadian Tax Foundation, the Counsel for International Tax Education and the Canadian Life and Health Insurance Association. He was an indirect tax lecturer in the Graduate programs in taxation of McGill University and Université de Sherbrooke. He was also a lecturer in the apff's in-depth GST course (course for financial services) for several years. He has written or reviewed comments published in CCH's commodity tax products and he writes for CCH's tax newsletter. He is a member of CPA Canada’s Commodity Tax Committee and he has been a member of the GST Leaders Forum since its inception in 2007.

Mario is a fully bilingual certified public accountant who graduated from McGill University. He is a member of the Canadian Institute of Certified Public Accountants of l’Ordre des comptables professionnels agréés du Québec. He has been specializing in commodity taxes since the introduction of GST in 1991.


  • Indirect Tax Consulting
  • Transactional Work
  • Audit Defense


  • Indirect Tax
  • Corporate Transactions
  • Tax Dispute Resolution


  • McGill University

Area of interest

  • Hockey
  • Biking
  • History