I just found it.
- Cross-border trade: (Also referred to as pricing consistency.) We support European Union (EU) merchants operating across regions and geographies who want to show their customers a single price. Pricing is clean and uncluttered regardless of tax structures and rates that vary from country to country.
To enable cross-border trade in the Admin Panel, click System > Configuration > SALES > Tax > Calculation Settings, option Enable Cross Border Trade.
http://devdocs.magento.com/guides/m1x/ce19-ee114/ce1.9_release-notes.html
/close
thx