Quebec will do it by simple political will, if I can put it that way.
Let's take the example of the taxation of the Web giants. Quebec has started to do it, and it works well. Similarly, if Quebec chooses to do more investigations of Quebec residents who use tax havens illegally, Revenu Québec could obtain the information directly. The Canada Revenue Agency has the power to do so at this time, but the government is being lax in this area, so not much progress is being made on the file. One can think of the leak of confidential documents—the Panama Papers or the Paradise Papers. Every country has gone looking for cases, but Canada has done nothing, due to a lack of political will.