Atty. Mike Collinge
Mike Collinge is the Leader of the Tax Litigation and Controversy Practice for the Ontario Region of Deloitte Legal Canada LLP. His practice is primarily focused on tax litigation and tax controversy.
Tax Law Attorney
Profile Summary
About Mike Collinge at a Glance
Mike Collinge is a tax attorney, practicing at Deloitte Legal Canada LLP. Recognitions include Best Lawyers in America — Tax Law (2026).
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About Mike Collinge
Mike Collinge is the Leader of the Tax Litigation and Controversy Practice for the Ontario Region of Deloitte Legal Canada LLP. His practice is primarily focused on tax litigation and tax controversy. He was admitted to the Law Society of Ontario in 2012 after receiving his Juris Doctor from the University of Toronto Faculty of Law and completing a clerkship at the Tax Court of Canada.
Mike has successfully represented clients in a wide variety of domestic and international tax disputes involving the Canada Revenue Agency and the provincial tax authorities, and in litigation proceedings in the Tax Court of Canada, the Federal Court and the Federal Court of Appeal. Mike regularly assists clients by filing notices of objection with the tax authorities, responding to complex audits, and conducting court proceedings to dispute tax assessments. Representative recent engagements include the following:
- Successful resolution of a Tax Court appeal involving reassessments totaling approximately $550 million that were issued to a Fortune Global 500 company in connection with a share valuation issue.
- Successful application for judicial review to challenge a decision by the CRA denying the retroactive revocation of an election by a major Canadian insurance company.
- Successful Tax Court appeal involving the existence of a partnership that was created by a member of the S&P/TSX 60.
- Successful resolution of notices of objection to dispute reassessments totaling approximately $150 million that were issued to a Fortune Global 500 company on the basis that an instrument should be characterized as equity rather than debt.
- Currently representing a venture capital company in a Tax Court appeal involving the application of the GAAR to a so-called “loss trading” transaction.
- Currently assisting an offshore trust that has filed notices of objection to dispute reassessments that were issued in connection with a residency issue.
Memberships and Professional Affiliations
Education
- University of Toronto Faculty of Law: J.D. (2011)
- University of Victoria: B.A. (Hons.) (2005, with distinction)
- Chartered Professional Accountants of Canada (CPA) In-Depth Tax Course, Parts I, II and III
Practice Areas Explained
Mike Collinge's Areas of Legal Practice
Each practice area below reflects the types of cases Mike Collinge handles, with a practical overview of what that area of law involves and how it may apply to your situation.
Tax Law
Tax attorneys handle IRS audits, tax debt, international tax, estate planning, and tax court litigation.
Mike Collinge is one of 84,606 tax attorneys indexed nationally. Browse tax attorneys →
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Professional Profile
Why Clients in Your Area Choose Mike Collinge
Selecting an attorney is one of the most consequential decisions you can make when a legal matter arises. Below are the core qualities that distinguish Mike Collinge's practice in the field of tax.
Focused Tax Practice
Concentrating on tax means Mike Collinge's knowledge of relevant statutes, case law, and procedural nuances stays current — unlike generalist practices that spread attention across unrelated fields.
Transparent Client Communication
Clients consistently note that understanding what is happening in their case — and why — is as important as the outcome itself. Mike Collinge maintains clear, timely communication throughout every matter.
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