You may need to calculate the ITC differently if you have a not for profit or charity. If you get the same results either way and your taxes are set up properly for each province it may not be an issue. But if you only set up your province and buy from another province with different tax rates that could be an issue. I’d choose not included and check the taxes rather than assuming it’s all inclusive when rates might vary by location. Or if someone doesn’t charge tax because they aren’t required to.