We are not familiar with other companies’ exact calculation and billing to their customers, but what we do is: we forward your order up to Canada clearing customs, we pay applicable duties and taxes and when you pick up your package we just ask you to pay us back this same amount in CAD, making this whole process very convenient to you.  The Canada Border Services Agency (CBSA) collects duty and taxes on imported goods, on behalf of the Government of Canada. Duty is a tariff payable on a good imported to Canada. Rates of Duty are established by the Department of Finance Canada and can vary significantly from one trade agreement to another. The CBSA has an online Duty and Taxes Estimator tool that provides an estimate for goods imported for personal use. You can find more details HERE.