Counter Tax Litigators LLP is a Toronto-based disputes specialist firm that solely focuses on tax issues. The firm acts for a range of clients from private companies to high-net-worth individuals and can advise clients on corporate residency, real estate development and resource sector taxation. Peter Aprile co-chairs the team alongside Natalie Worsfold, Aprile is a go-to lawyer for tax disputes and currently serves on the Canadian Bar Association’s Tax Court Bench and Bar Committee. Worsfold centres her practice on high-stakes tax disputes involving CEOs and high-net-worth individuals.

Felesky Flynn LLP is known for its specialism in tax, acting as tax counsel to domestic and international public and private corporations. It excels in advising clients on tax strategies for transactions such as M&As, de-mergers and spin offs, dispositions and asset transfers and reorganizations. The team also has expertise in resource taxation and butterfly spin of transactions. Christopher J. Montes resides in Calgary and is a tax planning expert who represents clients in tax disputes. Also in Calgary, Anthony Strawson KC  is the name to note for high net worth individuals and families requiring assistance with transactional tax, estate planning and tax disputes advice. Over in Edmonton, K. John Fuller focuses on tax planning issues for both private corporations and family organizations.

Blake, Cassels & Graydon LLP has a premier tax practice which stands out for its expertise in handling high-profile M&As. The team is well-versed in assisting clients with tax advice for domestic, cross-border and multi-jurisdictional transactions and reorganizations. The team also has expertise in transfer pricing issues which has become an increasing area of focus for the firm. Paul Stepak leads the tax group from Toronto and is sought out for his knowledge on US and foreign private equity investments in Canada. Co-head Jeffrey Shafer, Mark Tonkovich and Pooja Mihailovich all co-lead the Toronto practice alongside Stepak. Shafer is the go-to partner for transfer pricing issues, while Tonkovich is an expert in tax disputes and tax controversies. Mihailovich joined the firm in 2025 following her departure from Osler, Hoskin & Harcourt LLP and specializes in tax disputes and litigation. Outside of Toronto, Dan Jankovic practices corporate income tax law from Calgary.

Davies Ward Phillips & Vineberg LLP is known for its market-leading tax practice which excels in both transactional tax issues and litigation. The firm has a combined Canadian and US tax practice which allows it to advise both North American and Canadian clients on tax planning issues on both continents. The team regularly assists clients with cross-border transactions from restructuring proceedings to investment deals. The firm also has a strong team of tax litigators which advise clients from audit to representation before all levels of courts in Canada. Elie Roth spearheads the practice from Toronto and has longstanding expertise in domestic and international tax issues, assisting clients with complex tax planning for transactions. Co-head Michael Kandev leads the Montréal team and is a transactional expert who is well-versed in cross-border M&A and transfer pricing issues. Brian Bloom is part of the Montréal team and acts as lead tax counsel on transactions, while Guy du Pont stands out for his work on tax appeal cases. In Toronto, Ian Crosbie advises private equity and venture capital firms on tax mandates and Christopher Anderson is noted for his work on tax consideration of executive compensation plans. Julie Colden is focused on strategic tax advice.

McCarthy Tétrault has continued to grow its sizeable tax practice which advises on tax planning, tax disputes and indirect tax issues. The firm has advised clients on large transactions such as corporate reorganizations and restructurings, handling all domestic and foreign tax planning matters. The firm boasts expertise in financial services, natural resources, real estate, tech and oil and gas sectors. It is also noted for its work on tax litigation, advising on audits, searches and seizures as well as appeals. For commodity tax, the firm assists clients with both tax planning and litigation advice. Practice head Raj Juneja leads the national tax group from Toronto and is the go-to tax counsel for multinationals. Brett Anderson spearheads tax practice from Calgary and is an expert in corporate tax planning and dispute resolution. Jeff Oldewening sits in the Toronto team and advises on tax aspects of M&A and corporate reorganizations.

Bennett Jones LLP‘s tax practice largely advises multinational corporations, private equity and investment funds as well as stakeholders on domestic and international tax mandates. The team has broad expertise across corporate and partnership tax, M&A, tax controversy, transfer pricing and indirect tax and cross-border planning. Thomas Bauer jointly leads the practice from Toronto alongside Anu Nijhawan, who sits in Calgary. Bauer is a transactional specialist who is well-versed in reorganizations, debt restructurings and cross-border transactions. Nijhawa provides income tax expertise to clients, including advising on international structures for Canadian multinationals. Jehad Haymour has a wealth of expertise in tax litigation and resides in Calgary alongside Greg Johnson, who is sought out by clients in the natural resources and energy sector for his tax expertise.

Goodmans LLP has a transactions-focused tax practice which excels in providing clients with tax advice for M&A, capital markets and restructuring transactions. The team has a wealth of expertise handling M&A tax issues for both public company M&As, private equity deals such as go-private transactions, joint ventures and strategic acquisitions. The firm not only assists Canadian clients but global companies and corporations on transactions within Canada and cross-border issues, especially those involving the US. The practice is spearheaded by tax heavyweight Carrie Smit, who is a commercial and corporate transaction specialist. She is known for her deep expertise in tax law, assisting with a wide array of issues from cross-border mergers to reorganizations, debt financings and private equity investments. Michael Royal co-leads the tax group and is the go-to lawyer for income taxation issues and is well-versed in structuring and implementing tax-efficient equity compensation plans. Counsel Mitchell Sherman and Jarrett Freeman are both also focused on income tax issues arising from transactions, while Jon Northup excels in cross-border transactions. The team is based in Toronto.

Stikeman Elliott LLP provides clients with both domestic and international tax advice and assists with tax planning and tax controversy matters related to transactions. Typical transactions the firm advises on includes M&As, private and public debt and equity financings, asset acquisitions and dispositions, reorganizations and restructurings as well as transfer pricing. The team is also capable of handle tax litigation, insurance taxation and resource taxation. The firm is sought out by a wide range of clients but in particular stands out for advising Canadian pension funds, institutional investors and foreign sovereign wealth funds. John Lennard co-leads the Toronto team with John O’Connor, with Lennard working with private and public companies on domestic and international tax planning, while O’Conner excels at corporate tax mandates. Frank Mathieu leads the Montréal team and centres his practice on income tax law. The Calgary tax group is led by Julie D’Avignon, who advises on tax issues arising from transactions. Also from the Toronto team, John Lorito is well-versed in tax aspects of corporate transactions such as reorganizations and M&As and Dean Kraus is the income taxation specialist for corporate and commercial transactions.

Torys excels in both advising on tax aspects of complex transactions and tax litigation for Canadian companies in a range of sectors from financial services to mining, energy and real estate. Over the last year the team has handled financial and capital market transactions as well as private equity transactions, advising on investments, M&As and financings. The team is also noted for its expertise in assisting high-net-worth families with tax issues such as estate, income and transfer tax planning. On the litigation side, the firm is adept at handling tax controversy matters, assisting clients with tax disputes and appeals. The Toronto-based team is led by Jerald Wortsman, who is a standout tax lawyer who focuses on domestic and international corporate tax planning, largely advising financial institutions and pension funds. Income tax specialist Gwen Watson advises on M&A and corporate reorganizations, Corrado Cardarelli centres his work on structuring domestic, cross-border and global business transactions and Martha MacDonald is an expert tax litigator who handles a range of tax issues from transfer pricing to tax avoidance and foreign tax credits. Lastly, John Tobin is part of the disputes team and advises financial institutions and large businesses on tax controversy.

Aird & Berlis LLP's tax group fields a strong bench of transactional and litigation tax specialists based in Toronto. The team has experience handling a range of tax disputes including corporate tax, income tax, international tax, pension issues and employment insurance matters. It has represented clients before all levels of courts in Canada as well as the Canadian International Trade Tribunal. Neil Bass and Louise Summerhill co-lead the tax litigation team and both are well-versed in handling tax disputes and tax controversy. Bass is also noted for his work on commodity taxation. Jack Bernstein focuses on international tax issues, Angelo Gentile specializes in indirect tax and tax litigation and Manjit Singh mainly handles cross-border tax mandates. Francesco Gucciardo is the go-to for tax advice related to corporate transactions.

Borden Ladner Gervais LLP has a wide geographical network spanning Canada with tax specialists located in Ottawa, Vancouver, Toronto. Montréal and Calgary. The team handles cross-border transactions for energy, tech, healthcare and infrastructure sectors. In particular, it is noted for its work on M&A, private equity and international tax planning. The firm also fields a tax disputes practice which represents clients in disputes involving transfer pricing, anti-avoidance rules and commercial transactions. Practice head Pamela Cross leads the team from Ottawa and assists clients with structuring charitable donations and advises tax-exempt organizations on tax implications of transactions. She also advises on tax matters related to employee compensation and the taxation of pensions. Natasha Miklaucic sits in Toronto and focuses on corporate transactions and international tax planning.

Cassels Brock & Blackwell LLP's tax and trusts group focuses on transactional issues, advising domestic and international public and private corporations, financial institutions, high-net-worth individuals and private equity funds. The team is noted for its work on M&A, reorganizations, restructurings, domestic and foreign investments and executive and employee compensation. The Toronto group is led by Zahra Nurmohamed, who is sought out for her knowledge on corporate tax matters, and is also well-versed in resource taxation. Douglas Richardson is the head of the Calgary team and is the go-to for energy clients, advising on domestic and international energy transactions and tax issues. The team also has specialists in specific tax areas, such as indirect and commodity tax, tax of goods and services, customs duty and tobacco taxes.

Fasken's tax group is led by Christopher Steeves out of Toronto, who is skilled in handling income tax issues arising from transactions and transfer pricing matters. The team handles commodity VAT and tax issues related to provincial and federal sales, use of value added taxes, insurance premiums and digital services tax. It also aids clients with executive compensation and benefits, cross-border tax issues related to M&A and other transactions and tax litigation. The firm mainly advises clients from the energy and natural resources sector, banking and finance and private clients. In Montréal, Alain Ranger is a tax and business law expert, while Martin Legault focuses on tax aspects of domestic and cross-border M&As, corporate reorganizations and debt restructurings.

McMillan LLP works across a wide array of tax matters from tax advisory and transactional issues to tax litigation and advocacy. The firm is often engaged in transactional issues spanning Canada and the US, advising private equity funds, financial institutions and enterprises in the natural resources, pharmaceutical and automotive sector. The team also acts as counsel to clients in transfer pricing disputes. For the investment fund sector, the firm advising issuers, investors and intermediaries on tax issues related to financial products. Michael Friedman and Michael Lubetsky jointly lead the practice from Toronto. Friedman handles a mix of tax transactions and disputes such as transfer pricing and taxation of investment funds and structured products. Lubetsky is a disputes specialist handling tax controversy.

Norton Rose Fulbright leverages its international network and team across Canada to advise clients from numerous sectors on cross-border and domestic tax aspects of transactions and litigation. The firm is well-versed in advising clients from energy, mining, financial services, infrastructure and agribusiness. Typical work includes advising on M&A, reorganizations, restructurings, transfer pricing and capital markets transactions. It also assists high-net-worth individuals and family offices with tax planning. In Montréal, litigation specialist Dominic C. Belley leads the team and has acted as lead counsel on a numerous Supreme Court level tax cases. Dion Legge spearheads the Calgary practice and is a corporate transactions expert who advises on international tax planning. Barry Segal is noted for his work on tax insurance.

Baker McKenzie largely advises public and private multinational clients on a range of cross-border tax issues and transactions. The team is also able to advise on transfer pricing issues and represent clients before Canadian courts and the Canadian Tax Authorities. Practice head Jacques Bernier leads on tax controversies and other tax-related litigation in Canada. He is often sought out for representation in sensitive cases involving Canadian tax authorities which includes bet-the-company cases. Emmanuel Sala is also qualified as a chartered professional accountant and uses his expertise in both law and accountancy to advise on legal tax issues. Both lawyers reside in Toronto.

Deloitte Legal Canada LLP is well-versed in Canadian tax laws, advising clients on tax planning strategies and tax-efficient business structures. The team advises international corporations and high-net-worth individuals on legal and tax aspects of wealth, estate and business planning and tax issues faced by large companies. It also tax controversy and tax litigation specialists to advise on domestic and international income tax, provincial sales tax and customs. Olivier Fournier leads the Montréal team and is a tax litigation specialist who assists clients both in and out of court. Joel Scheuerman leads the Calgary tax group and is noted for his work on customs verifications and disputes. Over in Vancouver, Joyce Lee KC aids clients with private and public corporate tax planning and reorganizations, while Michael Collinge represents clients in domestic and international disputes from Toronto. Newly promoted partner Aicha Nafii guides clients through tax litigation and transfer pricing issues. The aforementioned lawyers all co-lead the team.

Dentons leverages its global network and expertise in multiple practice areas such as corporate and M&A, technology and entertainment to advise clients on domestic and cross-border transactions. The team aids clients with navigating different tax systems in Canada and globally, ensuring that clients stay tax-efficient and are aware of potential tax consequences that arise from expanding operations overseas. The team is led out of Toronto by Mark Jadd, who is well-versed in tax issues that come with corporate transactions. Larry Nevsky is key to the tax practice, advising on a large number of transactional issues for public and private clients.

Lawson Lundell LLP centres its tax practice on advising Canadian resource companies in the mining, oil & gas and timber sectors on transactional issues. Outside of this it also advises domestic institutional investors on domestic and overseas taxation. The team aids clients with business taxation including income tax, resource taxation and sales tax. It also assists with tax aspects and tax structuring of acquisitions and divestments, reorganizations and private equity fund investments. Reinhold Krahn spearheads the practice from Vancouver alongside Leonard Glass and provides taxation advice arising from transactions to large institutions and pension funds, while Glass supports clients with creating tax efficient structures and succession planning. Nancy Diep sits in Calgary and leads on corporate tax issues for resource sector clients.

Miller Thomson's corporate tax group advises clients on tax planning and tax aspects of corporate transactions. Clientele of the firm come from industries such as manufacturing and processing, automotive, real estate, construction, banking and financing and natural resources. Andrew Bateman leads the team from Calgary and handles a mix of trust and estate tax issues, First Nation taxation, private and public transactions and goods and services tax. Ron Choudhury is part of the team in Toronto and advises on tax issues related to corporate M&A transactions and financings. Shashi Malik is another tax expert in the Calgary team and excels in transactional issues and resolving disputes with tax authorities.