Canadian taxation

We contribute to the financial health of individuals and businesses at home by taking care of all their Canadian tax needs.

US taxation

We offer a full range of US tax services to make life easier for our clients. We know US taxes!

International taxation

We support our clients in the complex maze of international taxation. Our tips will help you see things more clearly!

The firm

We are a firm specializing in taxation that aims to be a single point of service, for both individuals and businesses. Our mission is to provide peace of mind to our clients and maximize their tax savings through our expertise in Canadian, US, and international taxation. Our team is made up of tax specialists and experienced tax technicians who all have customer satisfaction at heart.

“We are committed to providing you with peace of mind and maximizing your tax savings.”


Our tax experts offer you the benefit of their expertise in Canadian, US, and international taxation, so that you are better equipped for individual and corporate taxation, here and abroad.

New to Canada, I had considered preparing Canadian and US tax returns myself using software. But I quickly realized that I had no idea what I was doing at all. Effisca completed the declarations on short notice and before all deadlines. It was a great relief.

— Kimberly Hawthorne

How to make a complex tax return simple? Effisca.
Excellent service, clear process and expectations for an efficient result.
Everything is done 100% online without any problems.

— Henri Trouillard

I have been doing business with their team for over 10 years. My tax reports are extremely complex due to my work in the United States and Canada. A mix of freelance, employee, Canadian and US taxes. I have never had a single claim error to date. Everything seems so easy for them.

— David Boisvert

I called on the Effisca team to create the corporate structure for my business. With their dedication, in-depth tax expertise and quick-wittedness, I was particularly satisfied with the services rendered.

— Sevgi Kelci

The Effisca team has been doing my taxes for years and seems to fully appreciate the challenge of managing the interplay between the taxes of three different countries. There have been tax audits but the government has always ended up agreeing with Effisca.

— Brian White

I highly recommend the services of Effisca, especially Mr. Olivier Custeau. He was efficient, available and attentive, and helped me demystify my problem of having to file my US taxes as a resident of Quebec. Thanks again for everything!

— Christine Geffroy

I have been doing business with their team for 8 years. I have always been very satisfied with their professionalism, ethics and efficiency. I have no hesitation in recommending Effisca to friends and colleagues.

— Olga Navarro-Flores


We invest in the happiness and professional development of our employees by offering them a friendly working atmosphere, working conditions that promote a better work–life balance and by offering them overall competitive compensation and continuing education to improve their knowledge or advance their careers. Does that speak to you? Join us!