Exclude tax for certain countries (language)

I have a multi-language site (4 languages) and I want to SHOW price included tax for my country(language) and exclude prices for other countries (languages) NON-DOMESTIC. Is that possible?

Any1? I really need this.

Determining where your visitors are physically located (geolocation) is possible but not 100% reliable. And whether you charge tax or not depends on where you ship the goods which not necessarily may be the same as the ip location of the customer. So, all very confusing for the customer.

Making this language-dependant would be even more confusing. I have a spanish/english site in spain, national and international customers use both languages.

I decided to make it clear the prices are with tax...this is removed when a customer is logged in with a tax-exempt address.

torvista:

Determining where your visitors are physically located (geolocation) is possible but not 100% reliable. And whether you charge tax or not depends on where you ship the goods which not necessarily may be the same as the ip location of the customer. So, all very confusing for the customer.
This! You may potentially lose customers if you show the price with tax (25% for my country). Is it hard to set up? Is there any guidelines out there? Is it explained in the Zen Cart book?

Thanks!!