Replying to UPS shipping, us to canada

k so when someone says there gunna pay the shipping and they live in the states, do they pay 25$ and then once it gets across the border we have to pay for it? or if they pay for shipping does the entire bill go to them? including tax? so basically my question is im gunna buy something from virgina and im in ottawa and hes gunna send it UPS how much is this gunna cost me? cuz my dad says ill have to pay for UPS to bring it to my house form the border+tax