About Leigh Somerville Taylor Professional Corporation (LST Tax Law)

Leigh Somerville Taylor Professional Corporation operates in Toronto as LST Tax Law, a firm that works only on tax disputes and tax planning. It represents taxpayers and their accountants in civil, criminal, and quasi-criminal tax matters, handles federal and provincial audits and objections, negotiates collections arrangements, and applies for relief from penalties and interest. The firm also advises on tax-efficient estate plans and corporate reorganizations. Its office is at 4789 Yonge Street in Toronto.

Founder Leigh Somerville Taylor has resolved tax disputes with revenue authorities since 2001, after earning a B.A. (Hons) from the University of Toronto's Trinity College, a J.D. (2002), and an LL.M. in Tax (2011), both from Osgoode Hall Law School. Somerville Taylor was selected by the Law Society of Ontario to help design its Tax Law Specialist designation, formerly directed the Ontario Bar Association's Tax Law Section, and has taught for the Canadian Tax Foundation, the Law Society of Ontario, and Osgoode Hall Law School. The firm's published case summaries describe outcomes that range from reversing a disallowed $18 million loss claim first reported fourteen years earlier to winning interest relief for a family the Minister had otherwise left below the poverty line after tax payments.

Practice areas

Milestones & recognition

  • Leigh Somerville Taylor was selected by the Law Society of Ontario to help design and develop its Tax Law Specialist designation.
  • Somerville Taylor is a former director of the Ontario Bar Association's Tax Law Section.
  • Somerville Taylor has taught as an instructor and presenter for the Canadian Tax Foundation, the Law Society of Ontario, and Osgoode Hall Law School.
  • One of the firm's published case summaries describes reversing a Canada Revenue Agency disallowance of an $18 million loss claim, first reported fourteen years before the reassessment.

This firm’s lawyers at a glance

Law schools
Lincoln Alexander School of Law, Osgoode Hall Law School 2 of 2 lawyers

The neighbourhood

LST Tax Law's office is in the Hullmark Centre, a mixed use tower at Yonge Street and Sheppard Avenue that its developer, Hullmark, built in partnership with Tridel and describes as a focal point of the Yonge and Sheppard area. The tower sits on the southeast corner of the intersection, at the southern edge of North York City Centre, and it has its own entrance directly into Sheppard-Yonge subway station, where Line 1 and Line 4 meet. That direct connection means clients travelling by subway from downtown Toronto or elsewhere along either line can reach the firm's door without needing a car or a parking spot.

Frequently asked questions

I got a letter from the CRA about an audit or reassessment. Can LST Tax Law help?
Yes. The firm represents taxpayers and works with their accountants through federal and provincial audits, objections to assessments, and negotiations over collections arrangements, penalties, and interest.
Can LST Tax Law take my dispute to the Tax Court of Canada?
Yes. The firm's published case summaries describe multiple appeals to the Tax Court of Canada, and in one matter, an application for judicial review taken to the Federal Court.
I've been charged with a tax offence, like failing to file returns. Does the firm handle that?
Yes. Its case summaries describe representing people charged with failing to file income tax returns and, in a separate matter, with evading income tax and GST and making false statements, with the Crown withdrawing the charges in both cases before trial.
Can LST Tax Law help me make a voluntary disclosure to the CRA?
Yes. The firm describes handling voluntary disclosures on clients' behalf, including one case where it limited the CRA's review to a taxpayer's three most recent years despite over a decade of unreported income.
Does the firm only handle disputes, or also tax planning and estates?
Both. Alongside dispute resolution, LST Tax Law advises on tax-efficient estate plans and corporate reorganizations and works to identify planning opportunities for individuals and their professional advisors.
How big is LST Tax Law and how long has it practiced tax law?
It's a small Toronto firm. Founder Leigh Somerville Taylor has practiced tax dispute resolution since 2001, and senior law clerk Michelle Julfs, who has focused on tax litigation since 1999, has been with the firm since 2010.

Where to find them

4789 Yonge Street, Suite 204, Toronto, Ontario M2N 0G3 · 416-590-2671

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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 ↗