About Altro LLP

Altro LLP is a law firm founded in 1988 that focuses on cross border tax and estate planning for Canadians and Americans with interests on both sides of the border. Rather than being based in a single city, the firm operates out of four Canadian offices, in Montreal, Toronto, Vancouver and Calgary, along with locations in Florida, Arizona and California to serve clients who split time between Canada and the US Sun Belt. Managing Partner David A. Altro divides time between the Toronto and Montreal offices, holds Quebec notary status and a Florida law licence, and leads a wider team of lawyers and a notary who are licensed across several Canadian provinces and US states.

The firm's practice centers on Canadians who own US real estate, American citizens living in Canada, and cross border corporate and tax planning, along with more conventional wills, trusts and estate settlement work for Canadian clients. David Altro has written two books on cross border ownership and tax compliance, Owning US Property the Canadian Way and Americans Living in Canada: Smile, the IRS is Watching You, and before founding the firm worked as a partner at Holland & Knight, a large Florida law firm.

Milestones & recognition

  • Altro LLP was founded in 1988 and has been practicing cross border law for more than 35 years.
  • Managing Partner David Altro holds the TEP (Trust and Estate Practitioner) designation awarded by the Society of Trust and Estate Practitioners, the international body for trust and estate professionals.
  • Before founding Altro LLP, David Altro was a partner at Holland & Knight, a large Florida law firm.
  • David Altro has written two books on cross border tax and estate matters: Owning US Property the Canadian Way (3rd edition) and Americans Living in Canada: Smile, the IRS is Watching You.
  • A partner at the firm received the W.R. Jackett Prize in Taxation and the Stikeman Elliott/Carswell National Tax Award upon graduating law school, and articled for the justices of the Tax Court of Canada.

Good to know

A person using a wheelchairWheelchair accessible

Offices 4

20 Adelaide Street East, Suite 915, Toronto, Ontario M5C 2T6

1200 avenue McGill College, Suite 1100, Montréal, Québec H3B 4G7

1030 W Georgia St Ste 1918, Vancouver, BC V6E 2Y3

1060 7 St SW Ste 500, Calgary, AB T2R 0C4

The neighbourhood

The Toronto office sits on Adelaide Street East, just east of Yonge Street and within walking distance of the city's Financial District, home to most of Canada's major banks and trust companies. That's a fitting address for a practice built around moving money, property and estates across the Canada-US border. Toronto is one of four Canadian offices, alongside Montreal, Vancouver and Calgary; Managing Partner David Altro, who trained in civil law at the University of Montreal and holds Quebec notary status, divides time between the Toronto and Montreal locations rather than being based in either city alone.

Frequently asked questions

Does Altro LLP help Canadians who already own property in the US?
Yes. The firm advises Canadians who own or are considering buying US real estate on ownership structures, cross border tax exposure and the FIRPTA withholding rules that apply when a Canadian sells US property.
Can Altro LLP help an American citizen living in Canada with tax and estate planning?
Yes, tax and estate planning for US citizens is one of the firm's core practice areas, covering how US filing and estate rules interact with Canadian tax and estate law.
Does Altro LLP handle wills, trusts and probate for Canadian clients without US ties?
Yes. The firm prepares wills and trusts and helps clients manage probate fees and the tax consequences that arise on death, including for clients without cross border assets.
Does Altro LLP advise on cross border corporate and business tax planning?
Yes. The firm advises on domestic and cross border reorganizations, business purchases and sales, and joint venture structures where the tax rules of both Canada and the US come into play.
Where are Altro LLP's offices?
The firm has Canadian offices in Montreal, Toronto, Vancouver and Calgary, plus US offices in Florida, Arizona and California.
Does Altro LLP work with Canadians who split time in the US, like snowbirds?
Yes. The firm advises Canadians who spend part of the year in the US, including snowbirds, on the immigration related tax and estate planning issues that come with cross border living.

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