Mark Tonkovich

Practice Areas

Mark Tonkovich co-leads Blakes’ national Tax Controversy and Litigation group. His practice focuses exclusively on resolving Canadian tax disputes. He represents many of Canada’s and the world’s largest and most sophisticated businesses in tax-related civil litigation, administrative appeals, audit defence, and in proactively managing tax controversy risks. Mark has successfully acted for taxpayers at all levels of court, with the Federal Court of Appeal describing his work as ""exemplary"" in a 2013 judicial review application. He draws on Blakes' top-tier national tax practice to develop and execute comprehensive and practical strategies for resolving tax disputes as efficiently and favourably as possible, both within and beyond the courtroom.

Mark frequently writes and presents on tax issues for professional and industry organizations. He is a member of the Federal Courts Bench and Bar Liaison Committee and the editorial board of the journal Tax Litigation, and he previously chaired the Tax Court Bench and Bar Committee and the Ontario Bar Association’s Taxation Law Section. He has written dozens of articles on Canadian tax matters, including in the peer-reviewed Canadian Tax Journal and the National Journal of Constitutional Law. Earlier in his career, Mark was an appellate judicial clerk and a tax litigator with the Department of Justice.