In administration panel go to Configuration => Configure modules
Select Taxes module
Tax rate will be selected as default when adding a new product or a shipping method.
Check out products documentation.
Check out shipping methods documentation.
Special tax rate, which is set automatically for all countries outside the EU.
Operation principle:
In order to display the tax rate ex, both delivery country and country in the billing data must be outside the EU.
In administration panel go to Configuration => Configure modules => Invoices.
Check out invoices documentation.