Ontario directory

Tax Law Firms in City of Ottawa, Ontario

32 law firms.

What does a tax lawyer do?

Tax lawyers advise on income tax, GST/HST, disputes with the Canada Revenue Agency, and the tax side of business deals and estate planning, and they represent clients in tax appeals.

Income tax is mostly federal, administered by the Canada Revenue Agency, with provincial tax layered on top for certain matters.

How do you choose the right firm in City of Ottawa?

Ask whether the firm handles planning, disputes, or both, and how it'll work with your accountant so advice and filings stay aligned.

LawOnline lists 32 tax law firms in City of Ottawa, Ontario, with offices in Nepean, Kanata, and Orleans. You can confirm any lawyer's standing on the Law Society of Ontario directory. Browse the tax law firms in City of Ottawa below.

ASB Law Office

1 lawyer

ASB Law Office is an Ottawa (Nepean) firm specializing in real estate and corporate law, serving clients for over a decade and having closed more than 2,000 files. The firm is led by Ajaywant Singh Brar and also handl…

Real Estate LawReal Estate LawBusiness & Corporate LawBusiness & Corporate LawTax LawTax Law

Bennett Jones LLP

16 lawyers

Bennett Jones LLP is a national Canadian business law firm with more than a century of history, grown from a ten-lawyer prairie town office to a firm with offices in Calgary, Edmonton, Montreal, Ottawa, Toronto, Vanco…

Business & Corporate LawBusiness & Corporate LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionTax LawTax LawReal Estate LawReal Estate Law

Blake, Cassels & Graydon LLP

369 lawyers · Est. 1856

Blake, Cassels & Graydon LLP (Blakes) is a national business law firm with offices in Toronto, Calgary, Vancouver, Montreal, Ottawa, New York and London. The firm has practised business law in Canada since 1856 and ru…

Business & Corporate LawBusiness & Corporate LawReal Estate LawReal Estate LawEmployment & Labour LawEmployment & Labour LawBankruptcy & InsolvencyBankruptcy & Insolvency

Brazeau Seller Law

24 lawyers · Est. 1989

Brazeau Seller Law is an Ottawa business law firm founded in 1989, originally designed to serve family-owned businesses and help protect and grow their wealth. Today the firm offers corporate and commercial, real esta…

Business & Corporate LawBusiness & Corporate LawReal Estate LawReal Estate LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionTax LawTax Law

DioGuardi Law

2 lawyers

DioGuardi Law is an Ottawa tax law firm that also handles real estate transactions and estate planning. Its practice, built on founder Paul DioGuardi's tax work dating back to 1966, focuses on resolving CRA disputes, …

Tax LawTax LawReal Estate LawReal Estate LawWills, Estates & TrustsWills, Estates & TrustsBusiness & Corporate LawBusiness & Corporate Law

Elysium Legal

2 lawyers

Elysium Legal is a bilingual litigation boutique founded by Guillaume Sirois, with offices in Montreal, Ottawa, and Toronto. The firm focuses on public and business litigation, including judicial review, constitutiona…

Tax LawTax LawBusiness & Corporate LawBusiness & Corporate LawAdministrative & Regulatory LawAdministrative & Regulatory LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute Resolution

Erikson Law Firm

1 lawyer

Erikson Law Firm is a solo Ottawa practice led by Valentin Erikson, focused on real estate, wills and estates, tax and business law. It serves clients across Ottawa, Nepean, Kanata, Manotick and Orleans and offers fla…

Real Estate LawReal Estate LawWills, Estates & TrustsWills, Estates & TrustsTax LawTax LawBusiness & Corporate LawBusiness & Corporate Law

EY Law LLP

64 lawyers

EY Law LLP is a national Canadian law firm affiliated with Ernst & Young LLP, with lawyers based in Toronto, Calgary, Edmonton, Montreal, Ottawa and Vancouver. The firm practises business law, business immigration, em…

Business & Corporate LawBusiness & Corporate LawImmigration LawImmigration LawEmployment & Labour LawEmployment & Labour LawTax LawTax Law

Fasken Martineau DuMoulin LLP

19 lawyers · Est. 1863

Fasken is a leading international law firm with over 900 lawyers across eight Canadian offices plus London and Johannesburg. Its Toronto office was founded in 1863, and the firm is widely recognized for its mining, en…

Business & Corporate LawBusiness & Corporate LawEmployment & Labour LawEmployment & Labour LawTax LawTax LawAdministrative & Regulatory LawAdministrative & Regulatory Law

Fiszman

1 lawyer

Fiszman is an Ottawa tax and corporate law practice led by Alejandro Fiszman, focused on disputes with the Canada Revenue Agency, including audits, objections, Tax Court appeals, and Federal Court judicial reviews, as…

Tax LawTax LawBusiness & Corporate LawBusiness & Corporate Law

Gowling WLG

515 lawyers

Gowling WLG is an international law firm with more than 1,500 legal professionals across seven countries. Its Canadian practice, including a Toronto office at First Canadian Place, advises on business law, litigation,…

Business & Corporate LawBusiness & Corporate LawReal Estate LawReal Estate LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionClass ActionsClass Actions

HazloLaw is a boutique business law firm with offices in Ottawa and Toronto, focused on business law, international law, and tax dispute resolution. Founded and led by Hugues Boisvert, the firm works with entrepreneur…

Business & Corporate LawBusiness & Corporate LawTax LawTax Law

Kelly Santini LLP

48 lawyers · Est. 1976

Kelly Santini LLP is a full-service law firm in Ottawa with downtown and west-end offices, advising local, national, and international business owners, not-for-profits, insurers, and individuals since 1976. Its lawyer…

Business & Corporate LawBusiness & Corporate LawReal Estate LawReal Estate LawWills, Estates & TrustsWills, Estates & TrustsCivil Litigation & Dispute ResolutionCivil Litigation & Dispute Resolution

Kenneth Pope Law

2 lawyers

Kenneth Pope Law is an Ottawa estate planning firm focused on families with a member who has a disability, with particular expertise in Henson Trusts, adult guardianship, and probate. The firm has worked with ODSP cas…

Wills, Estates & TrustsWills, Estates & TrustsTax LawTax LawAdministrative & Regulatory LawAdministrative & Regulatory Law

LaBarge Weinstein LLP

23 lawyers · Est. 1997

LaBarge Weinstein LLP is a corporate law boutique with offices in Ottawa, Toronto, and Vancouver. Founded in 1997, it focuses on technology startups, growth-stage companies, and public companies, advising them from fo…

Business & Corporate LawBusiness & Corporate LawTax LawTax LawTechnology & StartupsTechnology & StartupsIntellectual PropertyIntellectual Property

Lavery de Billy

21 lawyers

Lavery de Billy is a Quebec law firm whose family law team was named among Canada's top family law firm teams by Canadian Lawyer in 2026. The firm has been expanding its use of artificial intelligence in legal practic…

Family LawFamily LawTax LawTax Law

LMS Lawyers LLP

9 lawyers · Est. 1988

LMS Lawyers LLP is a full-service law firm based in Ottawa, with additional offices in Kanata, Almonte, and Iqaluit, Nunavut. Founded roughly three decades ago, the firm practices family law, criminal defence, civil l…

Family LawFamily LawCriminal DefenceCriminal DefenceCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionBusiness & Corporate LawBusiness & Corporate Law

McMillan LLP

9 lawyers

McMillan LLP is a large, full-service Canadian business law firm with offices in Vancouver, Calgary, Toronto, Ottawa and Montreal. It has close to 300 lawyers and about 100 law clerks and paralegals, working across do…

Business & Corporate LawBusiness & Corporate LawConstruction LawConstruction LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionBankruptcy & InsolvencyBankruptcy & Insolvency

Michael Segal Professional Corporation is an Ottawa law firm focused on corporate, commercial, and estate planning law. The firm is led by Michael Segal, a Law Society of Ontario Certified Specialist in Corporate and …

Business & Corporate LawBusiness & Corporate LawWills, Estates & TrustsWills, Estates & TrustsTax LawTax Law

MLT Aikins LLP

28 lawyers

MLT Aikins LLP is a full-service Canadian law firm with offices across Western Canada and in Ottawa, including Vancouver, Edmonton, Calgary, Regina, Saskatoon, and Winnipeg. It advises businesses and institutions acro…

Business & Corporate LawBusiness & Corporate LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionEmployment & Labour LawEmployment & Labour LawImmigration LawImmigration Law

MUNERA

1 lawyer

MUNERA is a Canadian law firm with offices in Toronto, Ottawa, and Montreal, providing business law, advocacy, and personal legal services to corporations, financial institutions, entrepreneurs, governments, and indiv…

Business & Corporate LawBusiness & Corporate LawReal Estate LawReal Estate LawFamily LawFamily LawImmigration LawImmigration Law

NextGenLaw LLP

3 lawyers

NextGenLaw LLP is a boutique Ottawa law firm focused on property tax exemption litigation, sports dispute adjudication, and administrative law across Ontario. It represents property owners, charities, non-profits, and…

Tax LawTax LawAdministrative & Regulatory LawAdministrative & Regulatory LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute Resolution

Ofori Law

1 lawyer

Ofori Law is a corporate and commercial boutique law firm headquartered in Ottawa, with an additional office in Mississauga. The firm advises small and medium-sized businesses and individuals on business and tax plann…

Business & Corporate LawBusiness & Corporate LawTax LawTax LawReal Estate LawReal Estate Law

Osler, Hoskin & Harcourt LLP is a national business law firm with offices in Toronto, Montreal, Calgary, Vancouver, Ottawa, and New York. Its team of over 500 lawyers advises on corporate, tax, disputes, real estate, …

Business & Corporate LawBusiness & Corporate LawTax LawTax LawCivil Litigation & Dispute ResolutionCivil Litigation & Dispute ResolutionBankruptcy & InsolvencyBankruptcy & Insolvency