(Unless there's some law about not charging consumers in different provinces a different pre-tax cost, or some province charges so much tax that to make other provinces eat a share of that cost would be unreasonable.)
(Unless there's some law about not charging consumers in different provinces a different pre-tax cost, or some province charges so much tax that to make other provinces eat a share of that cost would be unreasonable.)
If I understood your suggestion correctly people dealing with these problems should do like we do here in Brazil: use the taxes to compose the final price so if I have a product that I want to sell for, let´s say, 10USD and will cost me an average 10% in taxes I would advertise it for 11USD and just deal with the taxes problem internally in my app and not by creating N different plans on the payment processor.
Sales tax varies from 5% to 15.5%, but only 11% of the country by population (Alberta and the territories) are at 5%, and majority are at 12 to 15%.