Hide Tax in subtotal to guests in magento

I have seen a couple variations of this question but I don't think they hit what I am trying to do spot on.

My pro开发者_如何学Pythonblem is, if a guest puts something into their cart and they view their cart they see the tax for it. It is unnecessary to show the tax to a customer before we know what state they live in.

Now, if they log in and are not in our state the tax does not show. Is it possible to hide tax from guests (Who have not logged in).

Using magento 1.5.1

you can associate different layout updates to customer_logged_in and customer_logged_out handles in order to differentiate layout behaviour but I don't think that this is the point.

Even if you know whether a customer is logged in or not, you won't know which is the tax destination until the checkout phase, so you probably have to show tax information only on the order review step of the checkout process.

Does it sounds right? Regards, Alessandro