[cotc2001]

I think i've got a better soloution (not sure how well it would work though with US states tax as I have no experience of them).

I had a mod done that uses geo targetting, so as soon as someone comes to my store it checks their IP and decides if they are coming from a country that I should include tax on or not (for example if they come from any country in europe show price including tax, if elsewhere show prices ex VAT), then if for some reason the IP table is incorrect when they create an account it is overidden by what the customer selects as their country.

This not only works on minicart but also for all prices and alt currency in the products and product tpls