Dominic Belley is a tax litigator. He has represented taxpayers in civil, criminal and constitutional matters before the Court of Quebec, the Quebec Superior Court, the Quebec Court of Appeal, the Supreme Court of British Columbia, the Tax Court of Canada, the Federal Court, the Federal Court of Appeal and the Supreme Court of Canada. His areas of practice include income tax, goods and services tax, fuel tax, collection measures, access to tax information, judicial review of ministerial decisions and rectification.

He was lead counsel before the Supreme Court of Canada in the case of Services Environnementaux AES, 2013 SCC 65, the leading case on rectification. He was lead counsel for CPA Canada before the Supreme Court of Canada in Guindon, 2015 SCC 41, a case on the determination of the civil or criminal nature of third-party penalties.

According to The Legal 500, Dominic Belley is singled out for his responsive and sound advice.