Canada is covered largely by US products extending north — TurboTax Canada and H&R Block both operate here — alongside the global professional platforms whose research corpora include Canadian law.
The most significant Canadian-founded company in tax AI is Blue J, out of the University of Toronto, which answers US, Canadian, and UK tax research questions with cited authority and outcome prediction. Crypto tax tools also serve Canadian filers well, since CRA reporting is a supported jurisdiction across the major engines.