I seem to recall you have tax rules based on country and region, so getting that all figured out might be a pain. It is probably going to take some custom coding, but I could certainly help in a 1 hour support session.
I'm sure you are already able to show the price without tax. So showing the tax price is the part you need help with... I'd probably end up writing a function on the page that takes the price and spits out the price with tax. It will just be a bunch of if statements and simple math, but would have to be done by hand.
Did this help? Tips are appreciated...
