About Siegal Tax Law

Siegal Tax Law and Siegal Law share one Toronto office at First Canadian Place on King Street West, but they are two separate practices under one roof. Siegal Tax Law was founded by Brandon Siegal and handles tax dispute resolution exclusively. Siegal Law, run by Alan Siegal, covers real estate, leasing, and corporate commercial work. The two ended up sharing space after Alan Siegal's previous firm, Kestenberg Siegal Lipkus LLP, wound down at the end of 2022 after more than 40 years, and Alan Siegal moved on to an individual practice.

Brandon Siegal's path to the tax bar started with a clerkship at the Tax Court of Canada, followed by four years at McCarthy Tetrault LLP and, from 2006 to 2011, a posting as counsel to the Department of Justice representing the Canada Revenue Agency on more than 600 litigation files. Alan Siegal's practice draws on decades representing businesses from startup through growth to an eventual sale, work that in recent years has extended into renewable energy and cannabis matters. Siegal Tax Law describes itself as built to skip the overhead of a large downtown practice in favour of direct, fixed-fee work.

Milestones & recognition

  • Alan Siegal practiced together with Michael Kestenberg and Lorne Lipkus for more than 40 years, most recently as partners in Kestenberg Siegal Lipkus LLP, until that firm wound down at the end of 2022 and each partner moved to a separate practice.
  • Brandon Siegal has won more than 50 cases before the Tax Court of Canada, the Federal Court of Appeal, the Ontario Court of Appeal, the Federal Court, and the Ontario Superior Court of Justice.
  • From 2006 to 2011, Brandon Siegal served as counsel to the Department of Justice, representing the Canada Revenue Agency on more than 600 litigation files, including appeals involving tax treaties, transfer pricing, and tax shelters.
  • Brandon Siegal is a member of the Canadian Tax Foundation, the Ontario Bar Association's Taxation Law Section, and the Advocates Society.

In the community

  • Brandon Siegal spoke on a 2019 Toronto Lawyers Association panel about the business challenges facing small law firms, covering scaling a practice, technology, and measuring success.
  • Brandon Siegal joined a Thomson Reuters session on changing legal workflows and digital tools in law practice.
  • Brandon Siegal wrote a Law Times Speaker's Corner column arguing that lawyers should defend clients' right to legal tax planning rather than back down from public criticism of it.
  • Brandon Siegal was interviewed on The 80/20 Principle podcast about the technology and software tools used to run a solo tax practice.

This firm’s lawyers at a glance

Called to the bar
1978–2006 · median 34 years in practice 2 of 2 lawyers
Law schools
Osgoode Hall Law School, University of Ottawa 2 of 2 lawyers

The neighbourhood

Siegal Tax Law and Siegal Law work out of First Canadian Place on King Street West, one of the towers that anchors Toronto's Financial District alongside the country's largest banks and national law firms. It's a fitting address for Alan Siegal's corporate and real estate practice, in the same district where those deals get done, but it also sits at odds with how the firms describe their own billing. Rather than the hourly rates common to Bay Street, Siegal Tax Law promises fixed fees, fee caps, and no unexpected bills.

For Brandon Siegal's tax litigation work, the location is also practical: it puts the office within the same downtown core as the Tax Court of Canada, where a number of the firm's cases have been argued.

Frequently asked questions

Does Siegal Tax Law try to resolve a CRA dispute before it goes to court?
Yes. The firm says it first looks for a resolution outside of court, using its knowledge of CRA audit and appeals processes, and moves to litigation when a negotiated result isn't available.
What kinds of tax matters does Siegal Tax Law handle?
The firm's work includes CRA audit assistance, Tax Court of Canada litigation, Federal Court judicial review applications, transfer pricing disputes and advance pricing agreements, and rectification applications in the Ontario Superior Court.
Can Siegal Law help with a commercial real estate purchase or lease in Toronto?
Yes. Alan Siegal's practice covers real estate, leasing, and corporate commercial work, including deals for businesses from early-stage startups through to established companies.
How does Siegal Tax Law bill for its work?
The firm offers fixed fees, fee caps, and success-based arrangements instead of open-ended hourly billing, and says clients will not receive an unexpected bill.
Is Siegal Law a new firm?
Alan Siegal practiced for more than 40 years with Michael Kestenberg and Lorne Lipkus as Kestenberg Siegal Lipkus LLP. When that partnership wound down at the end of 2022, Alan Siegal moved to an individual practice, Siegal Law, sharing an office with Siegal Tax Law.
Where are Siegal Tax Law and Siegal Law located?
Both operate from First Canadian Place, 100 King Street West, Suite 5700, in downtown Toronto.

Where to find them

First Canadian Place, 100 King St. W., Suite 5700, Toronto, ON M5X 1C7 · 416-915-1661

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Listing compiled from the firm’s public website in August 2026. Verify licence status in the Law Society of Ontario directory ↗