https://www.canada.ca/en/revenue-agency/services/forms-publications/publications/t4058/non-residents-income-tax.html
Taxing Canadian-source income
As a non-resident of Canada, you are subject to Canadian income tax on most Canadian-source income paid or credited to you during the year unless all or part of it is exempt under a tax treaty. Canada’s income tax system uses the following two methods to calculate the tax payable on Canadian-source income you receive.
Method 1 – Non-resident tax
Canadian financial institutions and other payers have to withhold non-resident tax at a rate of 25% on certain types of Canadian-source income they pay or credit to you as a non-resident of Canada. The most common types of income that could be subject to non-resident withholding tax include:
interest