Thorsteinssons

What Thorsteinssons does

Thorsteinssons LLP is a Canadian limited liability partnership founded in 1964 and headquartered in Vancouver, with a second office in Toronto. The firm describes itself as Canada's largest law firm practicing exclusively in taxation law, with lawyers consistently recognized as leading Canadian tax practitioners. Its service portfolio spans 11 core practice areas: corporate tax advice and planning, tax litigation, international taxation, taxpayer representation, resource tax, sales tax (GST/HST), customs and international trade, tax-exempt organizations, investment funds, estate planning, and criminal defence (tax-related prosecutions). The firm also publishes the Canadian Tax Blog and Tax Alerts as a knowledge resource and thought-leadership channel.

The firm's client base is primarily corporate entities — including Canadian-controlled private corporations, public companies, and multinational enterprises — together with high-net-worth individuals, tax-exempt organizations, and investment funds requiring specialized Canadian tax representation. Services are delivered through direct partner-led engagement at the Toronto and Vancouver offices, with no intermediary distribution channels.

Revenue is generated exclusively through professional legal fees on hourly or fixed-fee engagements; pricing is not publicly disclosed. The firm operates as a privately held partnership with no parent company, institutional investors, or external ownership, and it markets primarily through its blog, email subscription service, and participation in Canadian Tax Foundation conferences. A Chinese-language practice page signals a cross-border tax capability targeting Chinese-speaking clients and inbound investment.

Name

Thorsteinssons

Legal name

Thorsteinssons LLP

Website

https://thor.ca

Company type

Private

Founded year

1964

Operating status

Operating

Headcount range

101–250 employees

Short description

Thorsteinssons LLP is Canada's largest law firm practicing exclusively in taxation law, serving corporations, high-net-worth individuals, and tax-exempt organizations through its Vancouver and Vancouver/Toronto offices.

Ownership category

akta.pro rank

Headquarters

HQ city

Toronto

HQ country

Canada

HQ region

North America

Offices2 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Marketing or Sales, Technology or R&D, Infrastructure

Revenue model

1. Legal Services - Professional Fees: Thorsteinssons generates revenue through professional legal fees for tax advisory, tax litigation, and related legal services. The firm serves corporations, individuals, and organizations requiring specialized Canadian tax law representation. Fee structures typically involve hourly billing or fixed-fee arrangements for specific matters.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels3 records

Core offering

Thorsteinssons LLP is a Canadian law firm that exclusively practices taxation law, offering specialized legal services across corporate tax planning, tax litigation, international taxation, taxpayer representation before the Canada Revenue Agency, resource taxation, sales tax (GST/HST and provincial), customs and trade, tax-exempt organizations, investment funds, estate planning, and criminal defence. The firm serves corporations, high-net-worth individuals, and organizations requiring Canadian tax law advice, audit defence, and litigation representation.

Product overview

Thorsteinssons LLP operates as a single-focus tax law firm offering comprehensive legal services exclusively in Canadian taxation law. The firm's service portfolio consists of 11 core legal practice areas covering corporate tax advice, tax litigation, international taxation, taxpayer representation, resource taxation, sales tax/GST/HST, customs and trade, tax-exempt organizations, investment funds, estate planning, and criminal defence. The firm also maintains a knowledge resource through its Canadian Tax Blog providing commentary on tax legislation changes and CRA practices. Thorsteinssons positions itself as Canada's largest tax law firm with lawyers consistently recognized as leading tax practitioners.

Differentiator

Problem solved

Functional benefit

Products and services

• Corporate Tax Advice & Planning Legal advisory services for corporate tax planning, including advice on corporate structures, reorganizations, and tax-efficient arrangements for Canadian-controlled private corporations, public companies, and multinational enterprises.
• Tax Litigation Representation of taxpayers in disputes with tax authorities before the Tax Court of Canada, Federal Court, and appellate courts.
• International Taxation Advisory services on cross-border tax issues including foreign affiliate rules, transfer pricing, and international tax treaties.
• Taxpayer Representation Representation services before the Canada Revenue Agency (CRA) during audits, objections, and other administrative proceedings.
• Resource Tax Specialized tax advisory services for the resource sector including mining, oil and gas, and renewable energy industries.
• Sales Tax, GST and HST Advisory and litigation services related to Canadian sales taxes including GST, HST, and provincial sales taxes.
• Customs & International Trade Legal services addressing customs duties, trade compliance, and international trade regulations.
• Tax-Exempt Organizations Legal services for charities, non-profit organizations, and other tax-exempt entities including registration and compliance.
• Investment Funds Tax advisory services for investment funds, fund managers, and investors including mutual funds and hedge funds.
• Estate Planning Legal services for estate and succession planning including trust structures and wealth transfer strategies, primarily for high-net-worth individuals and families.
• Criminal Defence Defence services for individuals and corporations facing criminal tax evasion charges or related prosecutions.

Segments1 record

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Scale indicators1 record

Recent moves6 records

Expansion highlights4 records

Direct peers

• Torys LLP: Elite Canadian business law firm with a respected tax practice focused on corporate tax planning, mergers, and tax-efficient structuring. Competes for high-end corporate tax mandates.
• Davies Ward Phillips & Vineberg LLP: Toronto-based elite Canadian law firm with a market-leading tax practice serving corporate clients on tax planning, cross-border structuring, and tax litigation. Closest direct competitor to Thorsteinssons in the high-end Canadian tax advisory segment.
• Bennett Jones LLP: Calgary-based Canadian law firm with a particularly strong resource tax practice (energy, mining) and broader tax litigation capability. A direct peer given the overlap with Thorsteinssons' resource tax and tax litigation offerings.
• Blake, Cassels & Graydon LLP (Blakes): Leading Canadian law firm with a sizeable tax department handling corporate tax, tax litigation, and international tax matters. Overlaps with Thorsteinssons on tax advisory and CRA dispute work for large corporates.
• McCarthy Tétrault LLP: One of Canada's largest full-service law firms with a deep national tax practice spanning corporate tax, tax litigation, and international tax. Competes with Thorsteinssons for sophisticated corporate tax mandates while offering broader practice coverage.
• Osler, Hoskin & Harcourt LLP: Top-tier Canadian corporate law firm with a prominent tax group advising public companies and major corporate transactions. Competes with Thorsteinssons for sophisticated tax planning and tax dispute mandates.
• Stikeman Elliott LLP: Major Canadian business law firm with offices in Toronto, Vancouver, and other centers, offering a strong tax group serving public companies, private equity, and high-net-worth clients. Direct competitor in the corporate tax and tax litigation space.
• Dentons Canada LLP: World's largest global law firm with substantial Canadian presence and a corporate tax practice serving domestic and international clients. Overlaps with Thorsteinssons on cross-border and corporate tax mandates.

Others

• Norton Rose Fulbright Canada LLP:

Emerging players

• KPMG Law LLP (Canada): Big Four-affiliated legal services practice in Canada providing tax-focused legal advice often bundled with audit and advisory services. Represents the alternative legal services and cross-sell model that pressures traditional tax-only firms like Thorsteinssons.

Market position

Strengths4 records

Weaknesses4 records

Competitive moat3 records

Key risks5 records

Key highlights6 records

Customer concentration

• Xx.com/ThorTax

Revenue estimate

Valuation estimate

Number of profiles

Profiles1 record

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Thorsteinssons