Igor is recognized for his expertise and strategic acumen in tax litigation. Prior to Taxpayer Law, Igor was a partner at a prominent Bay Street firm in Toronto. In 2023, Igor transitioned from his role at a large firm to lead Taxpayer Law.
After being called to the Bar in Ontario in 2014, Igor dedicated himself to the niche field of tax disputes. He approaches tax litigation like a competitive sport, strategizing and navigating through the intricacies of the law.
Igor’s commitment to tax law has earned him the trust and respect of many accountants, lawyers, and other professionals who frequently seek his counsel on complex tax matters. He combines rigorous legal tactics with a dedication to achieving practical, successful outcomes for his clients.
- E-mail: igor@taxpayer.law
- Direct Phone Number: 1 647 368 8161
- Phone Number: 1 647 368 5999
- Lawyer Page: https://taxpayer.law/our-team/igor-kastelyanets/
- 1655 Dupont Street
Suite 101
Toronto, ON M6P 3T1
Canada
- University of Western Ontario, B.A. Honours, graduated 2009
- University of Toronto, J.D., graduated 2013
- Ontario, Law Society of Ontario, 2014
Taxpayer Law 1 Best Lawyers: Ones to Watch in Canada™ award
- Tax Law
Tell us a little bit about your practice and what makes it unique.
I’m a Co-Managing Lawyer at Taxpayer Law, a boutique firm focused squarely on tax disputes - from CRA audits and objections to Tax Court of Canada matters and voluntary disclosures. I approach each matter in a strategic manner: map the facts, pressure-test the law, and make smart, timely moves that get clients the resolution they are seeking. Before leading Taxpayer Law, I was a partner on Bay Street, and I’ve been in the tax-dispute area since being called in 2014.
What common questions are you asked by clients, and what are your answers?
“Do I have to talk to the CRA auditor right now?”
Not always. It’s often better to pause, get organized, and respond in writing with a clear strategy. We handle the communications so you don’t say more (or less) than you should.“How long do I have to object?”
Generally, 90 days from the date on your (re)assessment. If you miss it, there may be an extension window of up to one year after that deadline.“Do I have to go to court?”
Not necessarily. Many disputes are resolved at the Appeals stage. If we do appeal, you generally have 90 days after CRA’s decision to file in the Tax Court of Canada.
What is most challenging about your area(s) of expertise?
Two things. First, timelines - deadlines come fast. Second, the law often lives in the grey zone where facts matter as much as the law. Success means turning messy business reality into a clean, persuasive narrative backed by evidence, process, and precedent.
Were there any particular inspirations (people or events) that spurred your interest in your practice area(s)?
I’ve always loved the mix of rules and strategy. Tax litigation rewards careful planning and crisp execution - very much a “competitive sport” mindset I’ve brought to my practice since day one. Along the way I’ve had the privilege to argue and work on reported matters and to learn from excellent colleagues across the country.
Anything else you’d like to share?
Our team serves clients across Canada.
I’m honoured to be listed in Best Lawyers: Ones to Watch in Canada (2026) for Tax Law. Recognition is nice; results for clients matter more.
We run a pro-bono program for tax disputes that raise broader public-interest issues - because access to justice in tax matters matters.
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